Subchapter S—Subdivision and Stability

SUBCHAPTER S—SUBDIVISION AND STABILITY

PART 170—STABILITY REQUIRE- 170.185 Stability test preparations. 170.190 Stability test procedure modifica- MENTS FOR ALL INSPECTED VES- tions. SELS 170.200 Estimated lightweight vertical center of gravity. Subpart A—General Provisions Subpart G—Special Installations Sec. 170.001 Applicability. 170.235 Fixed ballast. 170.003 Right of appeal. 170.245 Form flotation material. 170.005 Vessel alteration or repair. 170.010 Equivalents. Subpart H—Watertight Bulkhead Doors 170.015 Incorporation by reference. 170.248 Applicability. 170.020 OMB control numbers assigned pur- 170.250 Types and classes. suant to the Paperwork Reduction Act. 170.255 Class 1 doors; permissible locations. 170.260 Class 2 doors; permissible locations. Subpart B—Definitions 170.265 Class 3 doors; required locations. 170.050 General terms. 170.270 Door design, operation, installation, 170.055 Definitions concerning a vessel. and testing. 170.275 Special requirements for cargo space Subpart C—Plan Approval watertight doors. 170.070 Applicability. Subpart I—Free Surface 170.075 Plans. 170.080 Stability booklet. 170.285 Free surface correction for intact 170.085 Information required before a sta- stability calculations. bility test. 170.290 Free surface correction for damage 170.090 Calculations. stability calculations. 170.093 Specific approvals. 170.295 Special considerations for free sur- 170.095 Data submittal for a vessel equipped face of passive roll stabilization tanks. to lift. 170.300 Special consideration for free sur- 170.100 Addresses for submittal of plans and face of spoil in hopper dredge hoppers. calculations. AUTHORITY: 43 U.S.C. 1333; 46 U.S.C. 2103, 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Subpart D—Stability Instructions for Comp., p. 277; Department of Homeland Secu- Operating Personnel rity Delegation No. 0170.1. 170.105 Applicability. SOURCE: CGD 79–023, 48 FR 51010, Nov. 4, 170.110 Stability booklet. 1983, unless otherwise noted. 170.120 Stability letter. 170.125 Operating information for a vessel Subpart A—General Provisions engaged in lifting. 170.135 [Reserved] § 170.001 Applicability. 170.140 Operating information for a vessel constructed on or after January 1, 2009 (a) This subchapter applies to each and issued a SOLAS safety certificate. vessel that is— (1) Contracted for on or after March Subpart E—Intact Stability Criteria 11, 1996, except where specifically stated otherwise; and 170.160 Specific applicability. (2) Either— 170.165 International Code on Intact Sta- bility. (i) Inspected under another sub- 170.170 Weather criteria. chapter of this chapter, or is a foreign 170.173 Criterion for vessels of unusual pro- vessel that must comply with the re- portion and form. quirements in subchapter O of this chapter; or Subpart F—Determination of Lightweight (ii) Required by either subchapter C Displacement and Centers of Gravity or subchapter E of this chapter to meet 170.174 Specific applicability. applicable requirements contained in 170.175 Stability test: General. this subchapter. 170.180 Plans and information required at (b) Each vessel contracted for before the stability test. March 11, 1996 may be constructed in

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accordance with the regulations in ef- CFR part 51. To enforce any edition fect at the time. However, any alter- other than that specified in this sec- ations or repairs must be done in action, the Coast Guard must publish a cordance with § 170.005. notice of change in the FEDERAL REG- (c) Certain regulations in this sub- ISTER and the material must be avail- chapter apply only to limited cat- able to the public. All approved mate- egories of vessels. Specific applica- rial is available for inspection at the bility statements are provided at the National Archives and Records Admin- beginning of those regulations. istration (NARA). For information on [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as the availability of this material at amended by CGD 89–037, 57 FR 41825, Sept. 11, NARA, call 202–741–6030 or go to http:// 1992; CGD 85–080, 61 FR 943, Jan. 10, 1996; www.archives.gov/federallregister/ USCG–2007–0030, 75 FR 78082, Dec. 14, 2010] codeloflfederallregulations/ § 170.003 Right of appeal. ibrllocations.html. It is also available for inspection at the Coast Guard, Of- Any person directly affected by a de- fice of Design and Engineering Stand- cision or action taken under this subchapter, by or on behalf of the Coast ards (CG–ENG), 2100 2nd St., SW., Stop Guard, may appeal therefrom in ac- 7126, Washington, DC 20593–7126, and is cordance with subpart 1.03 of this chap- available from the sources listed below. ter. (b) American Society for Testing and Materials (ASTM), 100 Barr Harbor [CGD 88–033, 54 FR 50382, Dec. 6, 1989] Drive, West Conshohocken, PA 19428– § 170.005 Vessel alteration or repair. 2959. (1) ASTM F 1196–00, Standard Speci- (a) Alterations and repairs to in- fication for Sliding Watertight Door spected vessels must be done— (1) Under the direction of the Officer Assemblies, 2008, incorporation by ref- in Charge, Marine Inspection; and erence (IBR) approved for § 170.270. (2) Except as provided in paragraph (2) ASTM F 1197–00, Standard Speci- (b) of this section, in accordance with fication for Sliding Watertight Door the regulations in this subchapter, to Control Systems, 2007, IBR approved the extent practicable. for § 170.270. (b) Minor alterations and repairs may (c) Naval Publications and Forms be done in accordance with regulations Center, Code 1052, 5801 Tabor Avenue, in effect at the time the vessel was Philadelphia, PA 19120. contracted for. (1) MIL–P–21929B, Military Specifica- tion, Plastic Material, Cellular Poly- § 170.010 Equivalents. urethane, Foam-in-Place, Rigid (2 Substitutions for fittings, equipment, Pounds per Cubic Foot), 15 January arrangements, calculations, informa- 1991, IBR approved for § 170.245. tion, or tests required in this sub- (2) [Reserved] chapter may be approved by the Com- (d) International Maritime Organiza- mandant, the Commanding Officer, tion (IMO), Publications Section, 4 Al- U.S. Coast Guard Marine Safety Cen- bert Embankment, London SE1 7SR, ter, 2100 2nd St., SW., Stop 7102, Wash- United Kingdom, +44 (0)20 7735 7611, ington, DC 20593–7102, or the Officer in Charge, Marine Inspection, if the sub- http://www.imo.org/. stitution provides an equivalent level (1) Resolution MSC.216(82), Adoption of safety. of Amendments to the International Convention for the Safety of Life At [USCG–2007–29018, 72 FR 53968, Sept. 21, 2007, Sea, 1974, As Amended (IMO Res. as amended by USCG–2009–0702, 74 FR 49239, Sept. 25, 2009] MSC.216(82), Adopted on 8 December 2006, IBR approved for §§ 170.140 and § 170.015 Incorporation by reference. 170.248. (a) Certain material is incorporated (2) Resolution MSC 267(85), Adoption by reference into this part with the ap- of the International Code on Intact proval of the Director of the Federal Stability, 2008 (2008 IS Code), Adopted Register under 5 U.S.C. 552(a) and 1

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on 4 December 2008, IBR approved for mines to present special hazards due to § 170.165. weather or other circumstances. (d) Great Lakes includes both the [USCG–2007–0030, 75 FR 78082, Dec. 14, 2010, as amended by USCG–2012–0832, 77 FR 59788, Oct. waters of the Great Lakes and of the 1, 2012] St. Lawrence River as far east as a straight line drawn from Cap de § 170.020 OMB control numbers as- Rosiers to West Point, Anticosti Is- signed pursuant to the Paperwork land, and west of a line along the 63rd Reduction Act. meridian from Anticosti Island to the (a) Purpose. This section collects and north shore of the St. Lawrence River. displays the control numbers assigned (e) Lakes, Bays, and Sounds includes to information collection and record- the waters of any lake, bay, or sound, keeping requirements in this sub- except the Great Lakes. chapter by the Office of Management (f) Oceans includes the waters of— and Budget (OMB) pursuant to the Pa- (1) Any ocean; perwork Reduction Act of 1980 (44 (2) The Gulf of Mexico; U.S.C. 3501 et seq.). The Coast Guard in- (3) The Caribbean Sea; tends that this section comply with the (4) The Gulf of Alaska; and requirements of 44 U.S.C. 3507(f), which (5) Any other waters designated as requires that agencies display a cur- ‘‘oceans’’ by the Commandant. rent control number assigned by the (g) Officer in Charge Marine Inspection OMB for each approved agency infor- (OCMI) means an officer of the Coast mation collection requirement. Guard who commands a Marine Inspec- (b) Display. tion Zone described in 33 CFR part 3 or an authorized representative of that of- 46 CFR part— Current OMB control No. ficer. § 170.075 ...... 1625–0064 (h) Oil means oil of any kind or in § 170.080 ...... 1625–0064 any form, and includes but is not lim- § 170.085 ...... 1625–0064 ited to petroleum, fuel oil, sludge, oil § 170.090 ...... 1625–0064 § 170.095 ...... 1625–0064 refuse, and oil mixed with wastes other § 170.100 ...... 1625–0064 than dredged spoil. § 170.110 ...... 1625–0064 (i) Partially protected waters means— § 170.120 ...... 1625–0064 § 170.125 ...... 1625–0064 (1) Waters within 20 nautical miles § 170.135 ...... 1625–0064 (37 kilometers) of the mouth of a har- § 170.180 ...... 1625–0064 bor of safe refuge, unless determined by the OCMI to be exposed waters; and [CGD 89–037, 57 FR 41825, Sept. 11, 1992, as (2) Those portions of rivers, harbors, amended by USCG–2004–18884, 69 FR 58350, lakes, etc. which the OCMI determines Sept. 30, 2004] not to be sheltered. (j) Protected waters means sheltered Subpart B—Definitions waters presenting no special hazards such as most rivers, harbors, lakes, etc. § 170.050 General terms. (k) Rivers means any river, canal, or (a) Commanding Officer, Marine Safety any other similar body of water des- Center (CO, MSC) means a district com- ignated by the OCMI. mander described in 33 CFR part 3 [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as whose command includes a merchant amended by CGD 88–070, 53 FR 34537, Sept. 7, marine technical office or an author- 1988] ized representative of the district com- mander. § 170.055 Definitions concerning a ves- (b) Commandant means the Com- sel. mandant of the Coast Guard or an au- (a) Assumed average weight per person thorized representative of the Com- means the weight calculated in accord- mandant. ance with § 170.090 of this part. (c) Exposed waters means waters more (b) Auxiliary sailing vessel means a than 20 nautical miles (37 kilometers) vessel capable of being propelled both from the mouth of a harbor of safe ref- by mechanical means and by sails. uge and other waters which the Officer (c) Barge means a vessel not equipped in Charge, Marine Inspection deter- with a means of self-propulsion.

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(d) Beam or B means the maximum used for the LBP for the purposes of width of a vessel from— this subchapter. The length or a por- (1) Outside of planking to outside of tion of the length of projections that planking on wooden vessels; and contribute more than 2 percent of the (2) Outside of frame to outside of underwater volume of the vessel is nor- frame on all other vessels. mally added to the actual LBP. (e) Bulkhead deck means the upper- (2) Length overall (LOA) means the most deck to which watertight bulk- horizontal distance between the for- heads and the watertight shell extend. ward-most and after-most points on (f) Constructed means the date— the hull. (1) The vessel’s keel was laid; or (3) Length on the waterline (LWL) (2) Construction identifiable with the means the horizontal distance between vessel began and assembly of that ves- the forward-most and after-most points sel commenced comprising of 50 metric on a vessel’s waterline. tons or at least 1 percent of the esti- (4) Length on deck (LOD) means the mated mass of all structural material, length between the forward-most and whichever is less. after-most points on a specified deck (g) Downflooding means, except as measured along the deck, excluding provided in § 174.035(b), the entry of sea- sheer. water through any opening into the (5) Load line length (LLL) has the hull or superstructure of an undamaged same meaning that is provided for the vessel due to heel, trim, or submer- term length in § 42.13–15(a) of this chap- gence of the vessel. ter. (h) Documented alterations means (6) Mean length is the average of the changes to the vessel which are re- length between perpendiculars (LBP) flected in the approved stability infor- and the length on deck (LOD). mation carried on board the vessel. (l) Lightweight means the displace- (i) Downflooding angle means, except ment of a vessel with fixed ballast and as specified by §§ 171.055(f), 172.090(d), with machinery liquids at operating 173.095(e), 174.015(b), and 174.035(b)(2) of levels but without any cargo, stores, this chapter, the static angle from the consumable liquids, water ballast, or intersection of the vessel’s centerline persons and their effects. and waterline in calm water to the (m) Main transverse watertight bulk- first opening that cannot be closed wa- head means a transverse bulkhead that tertight and through which must be maintained watertight in downflooding can occur. order for the vessel to meet the damage (j) Draft means the vertical distance stability and subdivision requirements from the molded baseline amidships to in this subchapter. the waterline. (n) Major conversion, as applied to (k) Length means the distance be- Great Lakes bulk carriers, means a tween fore and aft points on a vessel. conversion of an existing vessel that The following specific terms are used substantially changes the dimensions and correspond to specific fore and aft or carrying capacity of the vessel or points: changes the type of vessel or substan- (1) Length between perpendiculars tially prolongs its life or that other- (LBP) means the horizontal distance wise so changes the vessel that it is es- measured between perpendiculars sentially a new vessel. taken at the forward-most and after- (o) Permeability is the percentage of most points on the waterline cor- the volume of a space that can be occu- responding to the deepest operating pied by water. draft. For a small passenger vessel that (p) Sailing vessel means a vessel pro- has underwater projections extending pelled only by sails. forward of the forward-most point or (q) Ship means a self-propelled vessel. aft of the after-most point on the deep- (r) Tank vessel means a vessel that is est waterline of the vessel, the Com- specially constructed or converted to manding Officer, U.S. Coast Guard Ma- carry liquid bulk cargo in tanks. rine Safety Center, may include the (s) Tank barge means a tank vessel length or a portion of the length of the not equipped with a means of self-pro- underwater projections in the value pulsion.

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(t) Tank ship means a tank vessel (2) A deck cargo barge that complies propelled by mechanical means or with the requirements in § 174.020 of sails. this chapter. (u) Vessel means any vessel and in- (3) A tank vessel that only carries a cludes both ships and barges. product listed in § 30.25–1 of this chap- (v) Weather deck means the upper- ter and that is less than 150 gross tons. most deck exposed to the weather. (4) A tank barge that— (w) Existing sailing school vessel means a sailing vessel whose keel was laid (i) Operates only in rivers or lakes, prior to (January 9, 1986), which has an bays, and sounds service; application for initial inspection for (ii) Does not have to meet 33 CFR certification as a sailing school vessel part 157, subpart B; and on file with the Coast Guard prior to (iii) Only carries a product listed in (January 9, 1987), and whose initial in- § 30.25–1 of this chapter. spection for certification is completed (5) A sailing school vessel that is an prior to (January 9, 1988). open boat that complies with the re- (x) New sailing school vessel means a quirements in § 173.063(e) of this sub- sailing school vessel which is not an chapter. existing sailing school vessel. (y) Small passenger vessel means a ves- [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as sel of less than 100 gross tons— amended by CGD 83–005, 51 FR 923, Jan. 9, (1) Carrying more than 6 passengers, 1986; USCG–2007–0030, 75 FR 78083, Dec. 14, including at least one passenger for 2010] hire; (2) That is chartered with the crew § 170.075 Plans. provided or specified by the owner or (a) Except as provided in paragraph owner’s representative and carrying (b) of this section, each applicant for more than 6 passengers; an original certificate of inspection (3) That is chartered with no crew and approval of plans must also submit provided or specified by the owner or three copies for plan review being con- owner’s representative and carrying ducted by the Coast Guard Marine more than 12 passengers; or Safety Center of each of the following (4) That is a submersible vessel car- plans: rying at least one passenger for hire. (1) General arrangement plan of [CGD 79–023, 48 FR 51010, Nov. 4, 1983] decks, holds, and inner bottoms includ- EDITORIAL NOTE: For FEDERAL REGISTER ci- ing inboard and outboard profiles. tations affecting § 170.055, see the List of CFR (2) Lines. Sections Affected, which appears in the (3) Curves of form. Finding Aids section of the printed volume (4) Capacity plan showing capacities and at www.fdsys.gov. and vertical, longitudinal, and transverse centers of gravity of stowage Subpart C—Plan Approval spaces and tanks. § 170.070 Applicability. (5) Tank sounding tables showing— (i) Capacities, vertical centers of (a) Except as provided in paragraph (b) of this section, this subpart applies gravity, and longitudinal centers of to each vessel. gravity in graduated intervals; and (b) This subpart does not apply to (ii) Free surface data for each tank. any of the following vessels unless the (6) Draft mark locations including stability of the vessel is questioned by longitudinal location and vertical ref- the OCMI, or regulations by which the erence points. vessel is inspected require their appli- (b) Each small passenger vessel that cation: is designed to comply with the alter- (1) A passenger vessel that— nate intact stability requirements in (i) Is less than 100 gross tons; § 178.320 of this subchapter and the sim- (ii) Is less than 65 feet (19.8 meters) plified method of spacing main trans- LOD measured over the weather deck; verse watertight bulkheads in § 179.220 and of this subchapter does not have to (iii) Carries 49 or less passengers.

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submit the plans required by paragraph Person (AAWPP) calculated in accord- (a) of this section. ance with paragraphs (d) and (e) of this [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as section. amended by CGD 85–080, 61 FR 944, Jan. 10, (d)(1) The AAWPP is 185 lb from De- 1996; CGD 95–028, 62 FR 51217, Sept. 30, 1997; cember 1, 2011 until the AAWPP is first USCG–2007–0030, 75 FR 78083, Dec. 14, 2010] updated pursuant to the provisions of this section. As of the effective date of § 170.080 Stability booklet. the first AAWPP update after Decem- Before issuing an original certificate ber 1, 2011, this paragraph (d)(1) will be of inspection, the following number of superseded and cease to be effective. copies of the stability booklet required (2) The formula in paragraph (e) of by § 170.110 must be submitted for ap- this section will be used to determine proval; three copies for plan review an update to the AAWPP. It requires being conducted by the Coast Guard the use of data in the most recent re- Marine Safety Center. port released by the Centers for Dis- [CGD 95–028, 62 FR 51217, Sept. 30, 1997, as ease Control and Prevention (CDC) amended by USCG–2007–0030, 75 FR 78083, through the National Center for Health Dec. 14, 2010] Statistics (NCHS), or any successors to those centers. This report can be found § 170.085 Information required before on the CDC’s Web site. a stability test. (3) Each time the CDC releases a re- If a stability test is to be performed, port containing mean weights of a stability test procedure that contains United States adult males and females, the information prescribed in the Coast Guard will apply the formula § 170.185(g) must be submitted to the in paragraph (e) of this section to that Coast Guard Marine Safety Center at data. The resulting value will become least two weeks before the test. the new AAWPP only if the sum equals [CGD 95–028, 62 FR 51217, Sept. 30, 1997, as or exceeds 10 pounds more than the amended by USCG–2007–0030, 75 FR 78083, AAWPP then in effect. The Coast Dec. 14, 2010] Guard will notify the public of the new AAWPP in the FEDERAL REGISTER and § 170.090 Calculations. other appropriate media. (a) All calculations required by this (4) Updates to the AAWPP used in subchapter must be submitted with the calculations showing compliance with plans required by § 170.075 of this sub- this subchapter will be promulgated as part. Calculations must account for the interpretive rules and become effective weight of all loads carried aboard the in accordance with the provisions of vessel. this section without further rule- (b) If it is necessary to compute and making procedures. plot any of the following curves as part of the calculations required in this sub- (5) Notwithstanding any other provi- chapter, these plots must also be sub- sions of this section, the Coast Guard mitted: may choose, in its discretion, to con- (1) Righting arm or moment curves. duct further rulemaking procedures at (2) Heeling arm or moment curves. any time to amend this subchapter, in- (3) Cross curves of stability. cluding updates of the AAWPP. (4) Floodable length curves. (6) Updates to the AAWPP used in (c) The assumed weight per person calculations showing compliance with for calculations showing compliance this subchapter will be published in a with the regulations of this subchapter separate FEDERAL REGISTER notice and must be representative of the pas- other appropriate media, except when sengers and crew aboard the vessel the Coast Guard conducts further rule- while engaged in the service intended. making procedures under paragraph Unless the Officer in Charge, Marine (d)(5) of this section. Inspection (OCMI) permits or requires (7) Notwithstanding any other provi- the use of other values in writing, the sions of this section, the Coast Guard assumed weight per person of pas- may choose, in its discretion, to delay sengers and crew must not be less than or dispense with any update of the that the Assumed Average Weight per AAWPP. In the event the Coast Guard

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elects to dispense with or delay an up- § 170.075 if the vessel is engaged in lift- date that would otherwise issue as an ing and is required to comply with sub- interpretive rule pursuant to the provi- part B of part 173 of this chapter: sions of this section, the Coast Guard (a) A graph of maximum hook load will inform the public of the decision versus maximum crane radius. and explain the reasons in a FEDERAL (b) A table of crane radius versus the REGISTER notice. maximum distance above the main (e) To obtain an AAWPP update, add deck to which the hook load can be the mean weight of all U.S. males aged raised. 20 years and older to the mean weight (c) A table showing maximum of all U.S. females aged 20 years and vertical and transverse moments at older, and divide the sum by 2. To this which the crane is to operate. average of the mean weights, add 7.5 pounds of assumed clothing weight, § 170.100 Addresses for submittal of and round the resulting sum to the plans and calculations. nearest whole number in pounds. The plans, information, and calcula- (f) Updates to the AAWPP will be- tions required by this subpart must be come effective beginning one calendar submitted to one of the following: year after publication in the FEDERAL (a) The Sector Office in the zone REGISTER of a notice described in para- where the vessel is to be built or al- graphs (d)(3) and (d)(6) of this section, tered. except the initial AAWPP issued pursu- (b) By visitors to the Commanding ant to paragraph (d)(1) of this section Officer, U.S. Coast Guard Marine Safe- will become effective on December 1, ty Center, 1900 Half Street, SW., Suite 2011. Notwithstanding any other provi- 1000, Room 525, Washington, DC 20024, sions of this title, the Coast Guard may or by mail to: Commanding Officer, implement updates to the AAWPP at U.S. Coast Guard Marine Safety Cen- any time with less than one year of ter, 2100 2nd St., SW., Stop 7102, Wash- public notice when required for public ington, DC 20593–7102, in a written or safety reasons. electronic format. Information for sub- (g) The most recent FEDERAL REG- mitting the VSP electronically can be ISTER notice that publishes the AAWPP found at http://www.uscg.mil/HQ/MSC. as determined by this section is also on file at the U.S. Coast Guard, Office of [CGD 95–028, 62 FR 51217, Sept. 30, 1997, as amended by USCG–2006–25556, 72 FR 36330, Design and Engineering Standards July 2, 2007; USCG–2007–29018, 72 FR 53968, (CG–ENG), 2100 2nd St., SW., Stop 7126, Sept. 21, 2007; USCG–2009–0702, 74 FR 49239, Washington DC 20593–7126, or go to: Sept. 25, 2009; USCG–2007–0030, 75 FR 78083, http://www.uscg.mil/hq/cg5/cg5212 Dec. 14, 2010] [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as amended by USCG–2007–0030, 75 FR 78083, Subpart D—Stability Instructions for Dec. 14, 2010; 76 FR 16698, Mar. 25, 2011; Operating Personnel USCG–2012–0832, 77 FR 59788, Oct. 1, 2012] § 170.105 Applicability. § 170.093 Specific approvals. (a) Except as provided in paragraph Certain rules in this subchapter re- (b) of this section, this subpart applies quire specific approval of equipment or to each vessel. arrangements by the Commandant, (b) This subpart does not apply to OCMI, or Coast Guard Marine Safety any of the following vessels unless the Center. These approval determinations stability of the vessel is questioned by will be made as a part of the plan re- the OCMI: view process. (1) A deck cargo barge that complies [CGD 95–028, 62 FR 51217, Sept. 30, 1997, as with the requirements in § 174.020 of amended by USCG–2007–0030, 75 FR 78083, this chapter. Dec. 14, 2010] (2) A tank vessel that only carries a product listed in § 30.25–1 of this chap- § 170.095 Data submittal for a vessel ter and that is less than 150 gross tons. equipped to lift. (3) A tank barge that— The following data must be sub- (i) Operates only in rivers or lakes, mitted with the plans required by bays, and sounds service;

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(ii) Does not have to meet 33 CFR vents, downflooding angles, and allow- part 157, subpart B; and able deck loadings. (iii) Only carries a product listed in (4) Hydrostatic curves or tables. § 30.25–1 of this chapter. (5) Capacity plan showing capacities (4) A sailing school vessel that is an and vertical, longitudinal, and trans- open boat that complies with the re- verse centers of gravity of stowage quirements in § 173.063(e) of this sub- spaces and tanks. chapter. (6) Tank sounding tables showing ca- (5) A small passenger vessel inspected pacities, vertical centers of gravity, under subchapter T of this chapter if and longitudinal centers of gravity in § 178.210(c) of this chapter is applicable. graduated intervals and showing free [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as surface data for each tank. amended by CGD 83–005, 51 FR 923, Jan. 9, (7) Information on loading restric- 1986; CGD 85–080, 61 FR 944, Jan. 10, 1996; tions, such as a maximum KG or min- USCG–2007–0030, 75 FR 78084, Dec. 14, 2010] imum GM curve that can be used to determine compliance with applicable in- § 170.110 Stability booklet. tact and damage stability criteria. (a) Except as provided in paragraph (8) Examples of loading conditions. (e) of this section, a stability booklet (9) A rapid and simple means for eval- must be prepared for each vessel, ex- uating other loading conditions. cept for mobile offshore drilling units (10) A brief description of the sta- subject to the operating manual re- bility calculations done including as- quirements of § 109.121 of this chapter. sumptions. (b) Each stability booklet must be (11) General precautions for pre- approved by the Coast Guard Marine venting unintentional flooding. Safety Center. (12) A table of contents and index for (c) Each stability book must contain the booklet. sufficient information to enable the (13) Each ship condition which, if master to operate the vessel in compli- damage occurs, may require cross- ance with applicable regulations in this flooding for survival and information subchapter. Information on loading re- concerning the use of any special cross- strictions used to determine compli- flooding fittings. ance with applicable intact and dam- (14) The amount and location of fixed age stability criteria must encompass ballast. the entire range of operating drafts and (15) Any other necessary guidance for the entire range of the operating trims. the safe operation of the vessel under Information must include an effective normal and emergency conditions. procedure for supervision and reporting (16) For each self-propelled hopper of the opening and closing of all load- dredge with a working freeboard, the ing doors, where applicable. maximum specific gravity allowed for (d) The format of the stability book- dredge spoil. let and the information included will (e) A stability booklet is not required vary dependent on the vessel type and if sufficient information to enable the operation. Units of measure used in the master to operate the vessel in compli- stability booklet must agree with the ance with the applicable regulations in units of measure of the draft markings. this subchapter can be placed on the In developing the stability booklet, Certificate of Inspection, Load Line consideration must be given to includ- Certificate, or in the stability letter ing the following information: required in § 170.120. (1) A general description of the ves- (f) On board electronic stability com- sel, including lightweight data. puters may be used as an adjunct to (2) Instructions on the use of the the required booklet, but the required booklet. booklet must contain all necessary in- (3) General arrangement plans show- formation to allow for the evaluation ing watertight compartments, closures, of the stability of any intact condition

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that can be evaluated by use of the § 170.135 [Reserved] computer. § 170.140 Operating information for a [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as vessel constructed on or after Janu- amended by CGD 83–071, 52 FR 6979, Mar. 6, ary 1, 2009 and issued a SOLAS 1987; CGD 88–070, 53 FR 34537, Sept. 7, 1988; safety certificate. CGD 76–080, 54 FR 36977, Sept. 6, 1989; CGD 89– 037, 57 FR 41825, Sept. 11, 1992; CGD 95–028, 62 (a) This section applies to each vessel FR 51217, Sept. 30, 1997; USCG–2007–0030, 75 that is— FR 78084, Dec. 14, 2010] (1) Constructed on or after January 1, 2009; and § 170.120 Stability letter. (2) Issued either a SOLAS Passenger (a) Except as provided in paragraph Ship Safety Certificate or a SOLAS (b) of this section, each vessel must Cargo Ship Safety Construction Cer- have a stability letter issued by the tificate. Coast Guard before the vessel is placed (b) In addition to the information re- into service. This letter sets forth con- quired in § 170.110 of this part, the sta- ditions of operation. bility booklet of each vessel to which (b) A stability letter is not required this section applies must contain the if the information can be placed on the information required by applicable reg- Certificate of Inspection or the Load ulations of IMO Res. MSC.216(82) (in- Line Certificate. corporated by reference, see § 170.015). [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as (c) As used in SOLAS chapter II–1, amended by CGD 95–028, 62 FR 51217, Sept. 30, Administration means the Commandant, 1997; USCG–2007–0030, 75 FR 78084, Dec. 14, U.S. Coast Guard. 2010] [USCG–2007–0030, 75 FR 78084, Dec. 14, 2010] § 170.125 Operating information for a vessel engaged in lifting. Subpart E—Intact Stability Criteria In addition to the information required in § 170.110, the following infor- § 170.160 Specific applicability. mation must be included in the sta- (a) Except as provided in paragraphs bility booklet of a vessel that is re- (b) through (d) of this section, this sub- quired to comply with § 173.005 of this part applies to each vessel. subchapter: (b) This subpart does not apply to (a) Non-counterballasted vessel. If a any of the following vessels unless the vessel is not counterballasted, stability stability of the vessel is questioned by information setting forth hook load the OCMI: limits corresponding to boom radii based on the intact stability criterion (1) A deck cargo barge that complies in § 173.020 must be provided. with the requirements in § 174.020 of this chapter. (b) Counterballasted vessel. If a vessel is counterballasted with water, the fol- (2) A tank vessel that only carries a lowing information must be provided: product listed in § 30.25–1 of this chap- (1) Instructions on the effect of the ter and that is— free surface of the counterballast (i) Less than 150 gross tons; or water. (ii) A tank barge that operates only (2) Instructions on the amounts of in river or lakes, bays, and sounds serv- counterballast needed to compensate ice. for hook load heeling moments. (3) A sailing school vessel that is an (3) If a vessel has fixed counterbal- open boat that complies with the re- last, a table of draft versus maximum quirements in § 173.063(e) of this sub- vertical moment of deck cargo and chapter. hook load combined. (c) This subpart does not apply to the (4) If a vessel has variable counter- following vessels: ballast, a table of draft versus max- (1) A tank barge that carries a prod- imum vertical moment of deck cargo uct listed in Table 151.05 of this chap- and hook load combined for each ter. counterballasted condition. (2) A mobile offshore drilling unit.

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(3) A vessel that performs one of the P=.0033+(L/14,200)2 tons/ft2 . . . for Great simplified stability proof tests de- Lakes summer service or service on par- scribed in subpart C of part 178 of this tially protected waters. 2 2 chapter. P=.036+(L/1309) metric tons/m . . . for Great lakes summer service or service on par- (d) A vessel that complies with tially protected waters. § 170.165 of this part need not comply P=.0025+(L/14,200)2 tons/ft2 . . . for service on with §§ 170.170 and 170.173 of this part. protected waters. P=.028+(L/1309)2 metric tons/m2 . . . for serv- [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as ice on protected waters. amended by CGD 83–005, 51 FR 923, Jan. 9, L=LBP in feet (meters). 1986; CGD 85–080, 61 FR 944, Jan. 10, 1996; A=projected lateral area in square feet USCG–2007–29018, 72 FR 53968, Sept. 21, 2007; (square meters) of the portion of the ves- USCG–2009–0702, 74 FR 49239, Sept. 25, 2009; sel and deck cargo above the waterline. USCG–2007–0030, 75 FR 78084, Dec. 14, 2010] H=the vertical distance in feet (meters) from the center of A to the center of the un- § 170.165 International Code on Intact derwater lateral area or approximately Stability. to the one-half draft point. (a) Each vessel issued one or more of W=displacement in long (metric) tons. the certificates listed in paragraphs T=either: (1) the lesser of either 14 degrees heel or (a)(1) through (4) of this section, must the angle of heel in degrees at which one- comply with the Introduction and Part half the freeboard to the deck edge is im- A of the International Code on Intact mersed; or Stability, 2008 (2008 IS Code), unless (2) for a sailing vessel, T = the lesser of ei- permitted otherwise (incorporated by ther 14 degrees or the angle of heel in de- reference, see § 170.015). grees to the deck edge. (1) International Load Line Certifi- The deck edge is to be taken as the intersection of the sideshell and the uppermost cate. continuous deck below which the sideshell is (2) SOLAS Passenger Ship Safety weathertight. Certificate. (b) If approved by the Coast Guard (3) SOLAS Cargo Ship Safety Con- Marine Safety Center or the ABS, a struction Certificate. larger value of T may be used for a ves- (4) High-speed Craft Safety Certifi- sel with a discontinuous weather deck cate. or abnormal sheer. (b) A vessel not subject to the re- (c) When doing the calculations requirements of paragraph (a) of this sec- quired by paragraph (a) of this section tion is permitted to comply with the for a sailing vessel or auxiliary sailing applicable criteria contained in the vessel, the vessel must be assumed— 2008 IS Code as an alternative to the re- (1) To be under bare poles; or quirements of §§ 170.170 and 170.173 of (2) If the vessel has no auxiliary pro- this part. pulsion, to have storm sails set and [USCG–2007–0030, 75 FR 78084, Dec. 14, 2010] trimmed flat. (d) The criterion specified in this sec- § 170.170 Weather criteria. tion is generally limited in application (a) Each vessel must be shown by de- to the conditions of loading and oper- sign calculations to have a metacentric ation of flush deck, mechanically pow- height (GM) that is equal to or greater ered vessels of ordinary proportions than the following in each condition of and form for which the righting arm loading and operation: (GZ) at the angle (T), calculated after the vessel is permitted to trim free PAH until the trimming moment is zero, is GM ≥ not less than the minimum W tan (T) metacentric height (GM) calculated in Where— paragraph (a) of this section multiplied by sin(T). On other types of vessels, the P=.005+(L/14,200)2 tons/ft2 . . . for ocean service, Great Lakes winter service, or serv- Coast Guard Marine Safety Center re- ice on exposed waters. quires calculations in addition to those P=.055+(L/1309)2 metric tons/m2 . . . for in paragraph (a) of this section. On a ocean service, Great Lakes winter serv- mechanically powered vessel under 328 ice, or service on exposed waters. feet (100 meters) in length, other than

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a tugboat or a towboat, the require- 40 degrees or the downflooding angle, ments in § 170.173 are applied. whichever is less; [CGD 79–023, 48 FR 51010, Nov. 4, 1983; 49 FR (4) An area under each righting arm 37384, Sept. 24, 1984, as amended by CGD 88– curve between the angles of 30 degrees 070, 53 FR 34537, Sept. 7, 1988; CGD 85–080, 61 and 40 degrees, or between 30 degrees FR 944, Jan. 10, 1996; 61 FR 20556, May 7, 1996; and the downflooding angle if this CGD 95–028, 62 FR 51217, Sept. 30, 1997; USCG– angle is less than 40 degrees, of not less 2007–0030, 75 FR 78084, Dec. 14, 2010] than 5.6 foot-degrees (1.72 meter-de- § 170.173 Criterion for vessels of un- grees); and usual proportion and form. (5) An area under each righting arm (a) If required by the Coast Guard curve up to the angle of maximum Marine Safety Center, each mechani- righting arm of not less than the area cally powered vessel less than 328 feet determined by the following equation: (100 meters) LLL, other than a tugboat A=10.3+0.187 (30¥Y) foot-degrees or towboat, must be shown by design calculations to comply with— A=3.15+0.057 (30¥Y) meter-degrees (1) Paragraph (b) or (c) of this section where— if the maximum righting arm occurs at A=area in foot-degrees (meter-degrees). an angle of heel less than or equal to 30 Y=angle of maximum righting arm, degrees. degrees; or (2) Paragraph (b) of this section if the (d) For the purpose of demonstrating maximum righting arm occurs at an compliance with paragraphs (b) and (c) angle of heel greater than 30 degrees. of this section, at each angle of heel a (b) Each vessel must have— vessel’s righting arm is calculated (1) An initial metacentric height after the vessel is permitted to trim (GM) of at least 0.49 feet (0.15 meters); free until the trimming moment is (2) A righting arm (GZ) of at least zero. 0.66 feet (0.20 meters) at an angle of (e) For the purpose of demonstrating heel equal to or greater than 30 de- acceptable stability on the vessels degrees; scribed in § 170.170(d) as having unusual (3) A maximum righting arm that oc- proportion and form, compliance with curs at an angle of heel not less than 25 paragraphs (a) through (d) of this sec- degrees; tion or the following criteria is re- (4) An area under each righting arm quired: curve of at least 10.3 foot-degrees (3.15 meter-degrees) up to an angle of heel of (1) For partially protected routes, 30 degrees; there must be— (5) An area under each righting arm (i) Positive righting arms to at least curve of at least 16.9 foot-degrees (5.15 35 degrees of heel; meter-degrees) up to an angle of heel of (ii) No down flooding point to at least 40 degrees or the downflooding angle, 20 degrees; and whichever is less; and (iii) At least 15 foot-degrees of energy (6) An area under each righting arm to the smallest of the following angles: curve between the angles of 30 degrees (A) Angle of maximum righting arm. and 40 degrees, or between 30 degrees (B) Angle of down flooding. and the downflooding angle if this (C) 40 degrees. angle is less than 40 degrees, of not less (2) For protected routes, there must than 5.6 foot-degrees (1.72 meter-de- be— grees). (c) Each vessel must have— (i) Positive righting arms to at least (1) An initial metacentric height 25 degrees of heel; (GM) of at least 0.49 feet (0.15 meters); (ii) No down flooding point to at least (2) A maximum righting arm that oc- 15 degrees; and curs at an angle of heel not less than 15 (iii) At least 10 foot-degrees of energy degrees; to the smallest of the following angles: (3) An area under each righting arm (A) Angle of maximum righting arm. curve of at least 16.9 foot-degrees (5.15 (B) Angle of down flooding. meter-degrees) up to an angle of heel of

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(C) 40 degrees. ized Coast Guard representative at the time of the stability test: [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as amended by CGD 85–080, 61 FR 944, Jan. 10, (a) Lines. 1996; CGD 95–028, 62 FR 51218, Sept. 30, 1997; 62 (b) Curves of form. FR 51353, Sept. 30, 1997; USCG–2007–0030, 75 (c) Capacity plans showing capacities FR 78084, Dec. 14, 2010] and vertical and longitudinal centers of gravity of stowage spaces and tanks. Subpart F—Determination of Light- (d) Tank sounding tables. weight Displacement and (e) Draft mark locations. (f) General arrangement plan of Centers of Gravity decks, holds, and inner bottoms. (g) Inboard and outboard profiles. § 170.174 Specific applicability. (h) The stability test procedure de- This subpart applies to each vessel scribed in § 170.185(g). for which the lightweight displacement and centers of gravity must be deter- [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as mined in order to do the calculations amended by CGD 95–028, 62 FR 51218, Sept. 30, 1997; USCG–2007–0030, 75 FR 78084, Dec. 14, required in this subchapter. 2010]

§ 170.175 Stability test: General. § 170.185 Stability test preparations. (a) Except as provided in paragraphs The following preparations must be (c) and (d) of this section and in made before conducting a stability § 170.200, the owner of a vessel must test: conduct a stability test of the vessel (a) The vessel must be as complete as and calculate its vertical and longitu- practicable at the time of the test. dinal centers of gravity and its light- (b) Each tank vessel must be empty weight displacement. and dry, except that a tank may be (b) An authorized Coast Guard rep- partially filled or full if the Coast resentative must be present at each Guard Marine Safety Center deter- stability test conducted under this sec- mines that empty and dry tanks are tion. impracticable and that the effect of (c) The stability test may be dis- filling or partial filling on the location pensed with, or a deadweight survey of the center of gravity and on the dis- may be substituted for the stability placement can be accurately deter- test, if the Coast Guard has a record of, mined. or is provided with, the approved re- (c) All dunnage, tools, and other sults of a stability test of a sister ves- items extraneous to the vessel must be sel. removed. (d) The stability test of a vessel may (d) The water depth at the mooring be dispensed with if the Coast Guard site must provide ample clearance determines that an accurate estimate against grounding. of the vessel’s lightweight characteris- (e) Each mooring line must be ar- tics can be made and that locating the ranged so that it does not interfere precise position of the vessel’s vertical with the inclination of the unit during center of gravity is not necessary to the test. ensure that the vessel has adequate (f) The draft and axis of rotation se- stability in all probable loading condi- lected for testing a mobile offshore tions. drilling unit must be those that result [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as in acceptable accuracy in calculating amended by CGD 95–028, 62 FR 51218, Sept. 30, the center of gravity and displacement 1997; USCG–1998–4442, 63 FR 52192, Sept. 30, of the unit. 1998; USCG–2007–0030, 75 FR 78084, Dec. 14, (g) The stability test procedure re- 2010] quired by § 170.085 must include the following: § 170.180 Plans and information re- (1) Identification of the vessel to be quired at the stability test. tested. The owner of a vessel must provide (2) Date and location of the test. the following Coast Guard approved (3) Inclining weight data. plans and information to the author- (4) Pendulum locations and lengths.

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(5) Approximate draft and trim of the provided for the term in § 42.13–15(e) of vessel. this chapter. (6) Condition of each tank. [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as (7) Estimated items to be installed, amended by CGD 85–080, 61 FR 944, Jan. 10, removed, or relocated after the test, in- 1996] cluding the weight and location of each item. Subpart G—Special Installations (8) Schedule of events. (9) Person or persons responsible for § 170.235 Fixed ballast. conducting the test. (a) Fixed ballast, if used, must be— (1) Installed under the supervision of [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as the OCMI; and amended by CGD 88–070, 53 FR 34537, Sept. 7, (2) Stowed in a manner that prevents 1988; CGD 95–028, 62 FR 51218, Sept. 30, 1997; shifting of position. USCG–2007–0030, 75 FR 78084, Dec. 14, 2010] (b) Fixed ballast may not be removed from a vessel or relocated unless ap- § 170.190 Stability test procedure modifications. proved by the Coast Guard Marine Safety Center. However, ballast may be The authorized Coast Guard rep- temporarily moved for vessel examina- resentative present at a stability test tion or repair if done under the super- may allow a deviation from the re- vision of the OCMI. quirements of §§ 170.180 and 170.185 if [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as the representative determines that the amended by CGD 88–070, 53 FR 34537, Sept. 7, deviation would not decrease the accu- 1988; CGD 95–028, 62 FR 51218, Sept. 30, 1997; racy of the test results. USCG–2007–0030, 75 FR 78084, Dec. 14, 2010] [CGD 95–028, 62 FR 51218, Sept. 30, 1997, as § 170.245 Foam flotation material. amended by USCG–2007–0030, 75 FR 78084, Dec. 14, 2010] (a) Installation of foam must be approved by the OCMI. § 170.200 Estimated lightweight (b) If foam is used to comply with vertical center of gravity. § 171.070(d), § 171.095(c), or § 173.063(e) of this subchapter, the following applies: (a) Each tank vessel that does not (1) Foam may be installed only in carry a material listed in either Table void spaces that are free of ignition 1 of part 153 or Table 4 of part 154 of sources. this chapter may comply with this sec- (2) The foam must comply with NPFC tion in lieu of § 170.175 if it— MIL–P–21929B (incorporated by ref- (1) Is 150 gross tons or greater; erence; see 46 CFR 170.015), including (2) Is of ordinary proportions and the requirements for fire resistance. form; (3) A submergence test must be con- (3) Has a flush weather deck, one or ducted for a period of at least 7 days to more longitudinal bulkheads, and no demonstrate whether the foam has ade- independent tanks; and quate strength to withstand a hydrostatic head equivalent to that which (4) Is designed not to carry cargo would be imposed if the vessel were above the freeboard deck. submerged to its margin line. (b) When doing the calculations re- (4) The effective buoyancy at the end quired by §§ 170.170 and 172.065, the of the submergence test must be used vertical center of gravity of a tank ves- as the buoyancy credit; however, in no sel in the lightweight condition must case will a credit greater than 55 lbs be assumed to be equal to the following per cubic foot (881 kilograms per cubic percentage of the molded depth of the meter) be allowed. vessel measured from the keel (5) The structure enclosing the foam amidship: must be strong enough to accommo- (1) For a tank ship—70%. date the buoyancy of the foam. (2) For a tank barge—60%. (6) Piping and cables must not pass (c) As used in this section, molded through foamed spaces unless they are within piping and cable trunks acces- depth has the same meaning that is sible from both ends.

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(7) Sample specimens must be pre- § 170.250 Types and classes. pared during installation and the den- (a) Watertight doors, except doors be- sity of the installed foam must be de- tween cargo spaces, are classed as fol- termined. lows: (8) Foam may be installed adjacent (1) Class 1—Hinged door. to fuel tanks if the boundary between (2) Class 2—Sliding door, operated by the tank and space has double contin- hand gear only. uous fillet welds. (3) Class 3—Sliding door, operated by (9) MIL-P-21929B is incorporated by power and by hand gear. reference into this part. (b) The following types of watertight (10) The results of all tests and cal- doors are not permitted: culations must be submitted to the (1) A plate door secured only by OCMI. bolts; and (2) A door required to be closed by (11) Blocked foam must— dropping or by the action of dropping (i) Be used in each area that may be weights. exposed to water; and (c) Whenever a door of a particular (ii) Have a protective cover approved class is prescribed by these regulations, by the OCMI. a door of a class bearing a higher num- [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as ber may be used. amended by CGD 83–005, 51 FR 923, Jan. 9, 1986; USCG–2003–16630, 73 FR 65203, Oct. 31, § 170.255 Class 1 doors; permissible locations. 2008] (a) Except as provided in paragraphs Subpart H—Watertight Bulkhead (b) and (c) of this section, Class 1 doors within passenger, crew, and working Doors spaces are permitted only above a deck, the molded line of which, at its § 170.248 Applicability. lowest point at side, is at least 7 feet (a) Except as provided in paragraphs (2.14 meters) above the deepest load (b) through (d) of this section, this sub- line. part applies to vessels with watertight (b) Class 1 doors are permitted within doors in bulkheads that have been passenger, crew, and working spaces, made watertight to comply with the wherever located, if— flooding or damage stability regula- (1) In the judgment of the OCMI, the tions in this subchapter. door is in a location where it will be (b) A watertight door on a MODU closed at all times except when actu- must comply with § 174.100 of this sub- ally in use; and chapter. (2) The vessel is less than 150 gross tons and will not proceed more than 20 (c) A watertight door on a self-pro- nautical miles (37 kilometers) from pelled hopper dredge with a working shore; or freeboard must comply with § 174.335 of (3) The vessel is in rivers or lakes, this subchapter. bays, and sounds service. (d) Unless permitted otherwise, each (c) Class 1 doors are permitted in any vessel constructed on or after January location on a vessel that— 1, 2009 and issued a SOLAS Passenger (1) Is less than 100 gross tons; and Ship Safety Certificate or a SOLAS (2) Will operate only in the offshore Cargo Ship Safety Construction Cer- oil industry trade. tificate must comply with the applica- (d) Quick-acting Class 1 doors are ble regulations of IMO Res. MSC.216(82) permitted in any location on a vessel in addition to the requirements of this that operates on the Great Lakes and subpart (IMO Res. MSC.216(82) incor- is required to meet the damage sta- porated by reference, see § 170.015). bility standards of subpart H of part 172 of this chapter. [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as (e) For vessels required to meet the amended by CGD 76–080, 54 FR 36977, Sept. 6, damage stability standards of subpart 1989; USCG–2007–0030, 75 FR 78084, Dec. 14, H of this chapter, when Class 1 doors 2010] are installed below a deck the molded

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line of which at its lowest point at side sills are less than 2.14 meters above the is less than 7 feet (2.14 meters) above deepest load line. the deepest load line, an indicator light (d) Doors below a deck, the molded for each door which warns when the line of which, at its lowest point at door is open must be installed on the side, is less than 2.14 meters (7 feet) bridge. above the deepest load line if— [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as (1) The vessel is engaged on a short amended by CGD 80–159, 51 FR 33059, Sept. 18, international voyage as defined in 1986] § 171.010 of this subchapter; and (2) The vessel is required by § 171.065 § 170.260 Class 2 doors; permissible lo- of this subchapter to have a factor of cations. subdivision of 0.5 or less. (a) Except as provided in paragraphs [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as (b) and (c) of this section, a Class 2 amended by CGD 85–080, 61 FR 944, Jan. 10, door is permitted only if— 1996; CGD 96–041, 61 FR 50734, Sept. 27, 1996] (1) Its sill is above the deepest load line; and § 170.270 Door design, operation, in- (2) It is not a door described in stallation, and testing. § 170.265(d). (a) Each Class 1 door must have a (b) If passenger spaces are located quick action closing device operative below the bulkhead deck, Class 2 doors from both sides of the door. with sills below the deepest load line (b) Each Class 1 door on a vessel in may be used if— ocean service must be designed to with- (1) The number of watertight doors stand a head of water equivalent to the located below the deepest load line depth from the sill of the door to the that are used intermittently during op- margin line but in no case less than 10 eration of the vessel does not exceed feet (3.05 meters). two, and; (c) Each Class 2 and Class 3 door (2) The doors provide access to or are must— within spaces containing machinery. (1) Be designed, constructed, tested, (c) If no passenger spaces are located and marked in accordance with ASTM below the bulkhead deck, Class 2 doors F 1196 (incorporated by reference, see may be used if the number of water- § 170.015); tight doors located below the deepest (2) Have controls in accordance with load line that are used intermittently ASTM F 1197 (incorporated by ref- during operation of the vessel does not erence, see § 170.015); and exceed five. (3) If installed in a subdivision bulk- (d) In determining whether Class 2 head, meet Supplemental Require- doors are allowed under paragraph (c) ments Nos. S1 and S3 of ASTM F 1196 of this section, the watertight doors at (incorporated by reference, see the entrance to shaft tunnels need not § 170.015), unless the watertight doors be counted. If Class 2 doors are allowed are built in accordance with plans pre- under paragraph (c) of this section, the viously approved by the Coast Guard, doors at the entrance to shaft tunnels in which case, only Supplemental Re- may also be Class 2. quirements Nos. S1 and S3.1.4 of ASTM F 1196 (incorporated by reference, see § 170.265 Class 3 doors; required loca- § 170.015) must be met. In either case, tions. control systems for watertight doors The following doors must always be must have power supplies, power Class 3: sources, installation tests and inspec- (a) Doors in all locations not ad- tion, and additional remote operating dressed in §§ 170.255 and 170.260. consoles in accordance with Supple- (b) Doors between coal bunkers below mental Requirements Nos. S1 through the bulkhead deck that must be opened S4 of ASTM F 1197 (incorporated by ref- at sea. erence, see § 170.015). (c) Doors into trunkways that pass (d) Installations of sliding watertight through more than one main trans- door assemblies must be in accordance verse watertight bulkhead if the door with the following:

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(1) Before a sliding watertight door the beam is measured at right angles assembly is installed in a vessel, the to the centerline of the vessel at the bulkhead in the vicinity of the door level of the deepest load line. opening must be stiffened. Such bulk- (b) If the door is accessible while the head stiffeners, or deck reinforcement ship is in operation, it must have in- where flush deck door openings are de- stalled a lock or other device that pre- sired, must not be less than 6 inches vents unauthorized opening. nor more than 12 inches from the door (c) Before installing a watertight frame so that an unstiffened diaphragm door in a cargo space, approval must be of bulkhead plating 6 to 12 inches wide obtained from the Commanding Offi- is provided completely around the door cer, Marine Safety Center. frame. Where such limits cannot be maintained, alternative installations [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as amended by CGD 88–070, 53 FR 34537, Sept. 7, will be considered by the Marine Safe- 1988] ty Center. In determining the scantlings of these bulkhead stiffeners, the door frame should not be consid- Subpart I—Free Surface ered as contributing to the strength of § 170.285 Free surface correction for the bulkhead. Provision must also be intact stability calculations. made to adequately support the thrust bearings and other equipment that (a) When doing the intact stability may be mounted on the bulkhead or calculations required by this sub- deck. chapter, the virtual increase in the ves- (2) Sliding watertight door frames sel’s vertical center of gravity due to must be either bolted or welded water- liquids in tanks must be determined by tight to the bulkhead. calculating— (i) If bolted, a suitable thin heat and (1) For each type of consumable liq- fire resistant gasket or suitable com- uid, the maximum free surface effect of pound must be used between the bulk- at least one transverse pair of wing head and the frame for watertightness. tanks or a single centerline tank; and The bulkhead plating must be worked (2) The maximum free surface effect to a plane surface in way of the frame of each partially filled tank containing when mounting. non-consumable liquids. (ii) If welded, caution must be exer- (b) For the purpose of paragraph cised in the welding process so that the (a)(1) of this section, the tank or com- door frame is not distorted. bination of tanks selected must be (e) For each watertight door which is those having the greatest free surface in a required subdivision bulkhead, an effect. indicator light must be installed in the pilothouse and at each other vessel op- § 170.290 Free surface correction for erating station from which the door is damage stability calculations. not visible. The indicator must show (a) When doing the damage stability whether the door is open or closed. calculations required by this subchapter, the virtual increase in the ves- [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as amended by CGD 88–032, 56 FR 35828, July 29, sel’s vertical center of gravity due to 1991; CGD 85–080, 61 FR 944, Jan. 10, 1996; liquids in tanks must be determined by USCG–2000–7790, 65 FR 58464, Sept. 29, 2000] calculating— (1) For each type of consumable liq- § 170.275 Special requirements for uid, the free surface effect of at least cargo space watertight doors. one transverse pair of wing tanks or a (a) A door between cargo spaces— single centerline tank; and (1) Must not be designed for remote (2) The free surface effect of each par- operation; tially filled tank containing other than (2) Must be located as high as prac- consumable liquids. ticable; and (b) For the purpose of paragraph (3) Must be located as far inboard of (a)(1) of this section, the tank or com- the side shell as practicable but in no bination of tanks selected must be case closer to the side shell than one- those having the greatest free surface fifth of the beam of the vessel where effect.

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(c) When doing the calculations in where— paragraph (a) of this section, the free E.F.S.=the effective free surface. surface effect of a liquid in a tank must F.F.S.=the full free surface calculated in ac- be determined by— cordance with § 170.285(a). (1) Assuming the vessel is heeled five K=the reduction factor calculated in accord- degrees from the vertical; or ance with paragraph (c) of this section. (2) Calculating the shift of the center (c) The factor (K) must be calculated of gravity of the liquid in the tank by as follows: the moment of transference method. (1) Plot (I/d)tan T on Graph 170.295 § 170.295 Special consideration for free where— surface of passive roll stabilization (i) (I) is the moment of inertia of the tanks. free surface in the roll tank; (a) The virtual increase in the (ii) (d) is the density of the liquid in vertical center of gravity due to a liq- the roll tank; and uid in a roll stabilization tank may be (iii) (T) is the angle of heel. calculated in accordance with para- (2) Plot the moments of transference graph (b) of this section if— of the liquid in the roll tank on Graph (1) The virtual increase in the 170.295. vertical center of gravity of the vessel (3) Construct a line A on Graph is calculated in accordance with 170.295 so that the area under line A be- § 170.285(a); and tween T = 0 and the angle at which the (2) The slack surface in the roll sta- deck edge is immersed or 28 degrees, bilization tank is reduced during vessel whichever is smaller, is equal to the motions because of the shape of the area under the curve of actual mo- tank or the amount of liquid in the ments of transference between the tank. same angles. (b) The virtual rise in the vertical (4) The factor (K) is calculated by de- center of gravity calculated in accord- termining the ratio of the ordinate of ance with § 170.285(a) for a stabilization line A to the ordinate of the curve of (I/ tank may be reduced in accordance d)tan T, both measured at the angle at with the following equation: which the deck edge is immersed or 28 E.F.S.=(K)(F.F.S.) degrees, whichever is smaller.

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§ 170.300 Special consideration for free 171.072 Calculation of permeability for Type surface of spoil in hopper dredge II subdivision. hoppers. 171.073 Treatment of stepped and recessed bulkheads in Type II subdivision. The calculations required by this 171.075 [Reserved] subchapter for each self-propelled hop- 171.080 Damage stability standards for ves- per dredge must include— sels with Type I or Type II subdivision. (a) The free surface effect of consumable liquids and the free surface Subpart D—Additional Subdivision effect of the dredged spoil in the hop- Requirements pers; and 171.085 Collision bulkhead. (b) Either of the following assump- 171.090 Aft peak bulkhead. tions when performing the calculations 171.095 Machinery space bulkhead. required by § 174.310(b) of this chapter: 171.100 Shaft tunnels and stern tubes. (1) If the dredged spoil is assumed to 171.105 Double bottoms. be jettisoned, the free surface of the 171.106 Wells in double bottoms. dredged spoil may be disregarded. 171.108 Manholes in double bottoms. (2) If the dredged spoil is not assumed 171.109 Watertight floors in double bottoms. to be jettisoned. the free surface of the dredged spoil must be calculated. Subpart E—Penetrations and Openings in Watertight Bulkheads [CGD 76–080, 54 FR 36977, Sept. 6, 1989] 171.110 Specific applicability. 171.111 Penetrations and openings in water- PART 171—SPECIAL RULES PER- tight bulkheads in vessels of 100 gross TAINING TO VESSELS CARRYING tons or more. PASSENGERS 171.112 Watertight door openings. 171.113 Trunks. Subpart A—General 171.114 Penetrations and openings in watertight bulkheads in a vessel less than a Sec. 100 gross tons. 171.001 Applicability. 171.010 Definitions. Subpart F—Openings in the Side of a Ves- 171.012 Incorporation by reference. sel Below the Bulkhead or Weather 171.015 Location of margin line. Deck 171.017 One and two compartment standards of flooding. 171.115 Specific applicability. 171.116 Port lights. Subpart B—Intact Stability 171.117 Dead covers. 171.118 Automatic ventilators and side 171.045 Weight of passengers and crew. ports. 171.050 Passenger heel requirements for a 171.119 Openings below the weather deck in mechanically propelled or a non-self pro- the side of a vessel less than 100 gross pelled vessel. tons. 171.052 Passenger heel requirements for pontoon vessels. Subpart G—Watertight Integrity Above the 171.055 Intact stability requirements for a Margin Line monohull sailing vessel or a monohull auxiliary sailing vessel. 171.120 Specific applicability. 171.057 Intact stability requirements for a 171.122 Watertight integrity above the mar- sailing catamaran. gin line in a vessel of 100 gross tons or more. Subpart C—Subdivision and Damage 171.124 Watertight integrity above the mar- Stability gin line in a vessel less than 100 gross tons. 171.060 Watertight subdivision: General. 171.065 Subdivision requirements—Type I. Subpart H—Drainage of Weather Decks 171.066 Calculation of permeability for Type I subdivision. 171.130 Specific applicability. 171.067 Treatment of stepped and recessed 171.135 Weather deck drainage on a vessel of bulkheads in Type I subdivision. 100 gross tons or more. 171.068 Special considerations for Type I 171.140 Drainage of a flush deck vessel. subdivision for vessels on short inter- 171.145 Drainage of a vessel with a cockpit. national voyages. 171.150 Drainage of a vessel with a well 171.070 Subdivision requirements—Type II. deck. 171.155 Drainage of an open boat. 104

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AUTHORITY: 46 U.S.C. 2103, 3306; E.O. 12234, ble subdivision requirements in this 45 FR 58801, 3 CFR, 1980 Comp., p. 277; De- part. partment of Homeland Security Delegation (c) Equivalent plane bulkhead means a No. 0170.1. bulkhead that is— SOURCE: CGD 79–023, 48 FR 51017, Nov. 4, (1) Used in lieu of a recessed or 1983, unless otherwise noted. stepped bulkhead when doing the subdivision calculations required in this Subpart A—General part; and (2) Located as shown in Figure § 171.001 Applicability. 171.010(a). (a) Except as provided in paragraph (d) Ferry means a vessel that— (d) of this section, this part applies to (1) Operates in other than ocean or passenger vessels inspected under sub- coastwise service; chapter K or H of this chapter, or a (2) Has provisions only for deck pas- passenger vessel the stability of which sengers or vehicles, or both; is questioned by the Officer in Charge, (3) Operates on a short run on a fre- Marine Inspection (OCMI). quent schedule between two points (b) Specific sections of this part also over the most direct water route; apply to nautical school ships, sailing (4) Offers a public service of a type school vessels and oceanographic ves- normally attributed to a bridge or tun- sels. The applicable sections are listed nel. in subparts C and D of part 173 of this (e) Freeing port means any direct chapter. opening through the vessel’s bulwark (c) Specific sections of this part may or hull to quickly drain overboard also apply to a small passenger vessel water which has been shipped on ex- inspected under subchapter T of this posed decks. chapter. The specific sections are listed (f) Floodable length means the length in subparts B and C of part 178 of this of a shell to shell segment of the vessel chapter and in subpart B of part 179 of that, when flooded, will sink and trim this chapter. the vessel until the margin line is tan- (d) Unless permitted otherwise, a pas- gent to the waterline. senger vessel constructed on or after January 1, 2009, and issued a SOLAS (g) Flush deck means a continuous Passenger Ship Safety Certificate must weather deck located at the uppermost meet the applicable requirements of sheer line of the hull. IMO Res. MSC.216(82) (incorporated by (h) International voyage has the same reference, see § 171.012), instead of the meaning provided for the term in requirements of this part. For the pur- § 70.05–10 of this chapter. poses of this section, the applicable re- (i) Machinery space means, unless quirements of IMO Res. MSC.216(82) are otherwise prescribed by the Com- equivalent to the requirements of this mandant for unusual arrangements, part when applied to such vessels. the space extending from the molded base line to the margin line and be- [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as tween the main transverse watertight amended by CGD 83–005, 51 FR 923, Jan. 9, bulkheads bounding the following 1986; CGD 95–012, 60 FR 48052, Sept. 18, 1995; 60 FR 50120, Sept. 28, 1995; CGD 85–080, 61 FR 944, spaces: Jan. 10, 1996; USCG–2007–0030, 75 FR 78084, (1) Each space containing main and Dec. 14, 2010] auxiliary propelling machinery. (2) Each space containing propulsion § 171.010 Definitions. boilers. (a) Cockpit means an exposed recess (3) Each space containing permanent in the weather deck extending no more coal bunkers. than one-half of the vessel’s length (j) Open boat means a vessel not pro- over deck (LOD) measured over the tected from entry of water by means of weather deck. a complete deck, or by a combination (b) Deepest subdivision load line means of a partial weather deck and super- the waterline that corresponds to the structure which is seaworthy for the deepest draft permitted by the applica- waters upon which the vessel operates.

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(k) Passenger space means a space (4) That is a submersible vessel car- which is provided for the accommoda- rying at least one passenger for hire. tion and use of passengers, other than (n) Short international voyage means a baggage, store, provision or mail an international voyage where— room. (1) A vessel is not more than 200 nau- (l) Recessed bulkhead means a bulk- tical miles (370 kilometers) from a port head that is recessed as shown by bulk- or place in which the passengers and head B in Figure 171.010(b). crew could be placed in safety; and (m) Small passenger vessel means a (2) The total distance between the vessel of less than 100 gross tons— last port of call in the country in (1) Carrying more than 6 passengers, which the voyage began and the final including at least one passenger for port of destination does not exceed 600 hire; nautical miles (1111 kilometers). (2) That is chartered with the crew (o) Scupper means a pipe or tube of at provided or specified by the owner or least 30 millimeters (1.25 inches) in di- owner’s representative and carrying ameter leading down from a deck or more than 6 passengers; sole and through the hull to drain (3) That is chartered with no crew water overboard. provided or specified by the owner or (p) Stepped bulkhead means a bulk- owner’s representative and carrying head that is stepped as shown by bulk- more than 12 passengers; or head A in Figure 171.010(b).

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(q) Well deck means a weather deck length of the vessel (LOD) measured fitted with solid bulwarks that impede over the weather deck. the drainage of water over the sides or [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as an exposed recess in the weather deck amended by CGD 85–080, 61 FR 944, Jan. 10, extending one-half or more of the 1996]

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§ 171.012 Incorporation by reference. for the Safety of Life At Sea, 1974, As Amended (IMO Res. MSC.216(82), (a) Certain material is incorporated Adopted on 8 December 2006, incorpora- by reference into this part with the ap- tion by reference (IBR) approved for proval of the Director of the Federal §§ 171.001 and 171.080. Register under 5 U.S.C. 552(a) and 1 (2) Resolution MSC 267(85), Adoption CFR part 51. To enforce any edition of the International Code on Intact other than that specified in this sec- Stability, 2008 (2008 IS Code), Adopted tion, the Coast Guard must publish a on 4 December 2008, IBR approved for notice of change in the FEDERAL REG- § 171.050. ISTER and the material must be available to the public. All approved mate- [USCG–2007–0030, 75 FR 78085, Dec. 14, 2010, as rial is available for inspection at the amended by USCG–0832, 77 FR 59788, Oct. 1, National Archives and Records Admin- 2012] istration (NARA). For information on the availability of this material at § 171.015 Location of margin line. NARA, call 202–741–6030 or go to http:// (a) A vessel with a continuous bulkhead www.archives.gov/federallregister/ deck and sufficient sheer. If the average codeloflfederallregulations/ value of the sheer at the forward per- ibrllocations.html. It is also available pendicular (FP) and the after perpen- for inspection at the Coast Guard, Of- dicular (AP) is at least 12 inches (30.5 fice of Design and Engineering Stand- cm), the margin line must be located ards, Naval Architecture Division (CG– no less than 3 inches (7.6 cm) below the ENG–2), 2100 2nd St., SW., Stop 7126, upper surface of the bulkhead deck at Washington, DC 20593–7126, and is avail- side as illustrated in Figure 171.015(a). able from the sources listed below. (b) International Maritime Organiza- TABLE 171.015 tion (IMO), Publications Section, 4 Al- Average value of sheer at FP Required position of mar- bert Embankment, London SE1 7SR, and AP in inches (cm) gin line below top of deck United Kingdom, +44 (0)20 7735 7611, amidships in inches (cm) http://www.imo.org/. 12 (30.5) ...... 3 (7 .6) (1) Resolution MSC.216(82), Amend- 6 (15.2) ...... 6 (15 .2) ments to the International Convention 0 ...... 9 (22 .8)

(b) A vessel with a continuous bulkhead perpendicular (FP) and the after per- deck and insufficient sheer. If the aver- pendicular (AP) is less than 12 inches age value of the sheer at the forward (30.5 cm), the margin line must be a

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parabolic curve with the following below the surface of the bulkhead deck characteristics: amidships. (1) The parabolic curve must be at (3) Intermediate values not shown in least 3 inches (7.6 cm) below the upper Table 171.015 must be interpolated. surface of the bulkhead deck at the FP (4) Figure 171.015(b) illustrates a mar- and AP. gin line drawn in this manner. (2) The parabolic curve must be at least the distance given in Table 171.015

(c) A vessel with a discontinuous bulk- inches (7.6 cm) below the upper surface head deck. A continuous margin line of the bulkhead deck at side as illus- must be drawn that is no more than 3 trated in Figure 171.015(c).

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(d) A vessel with a discontinuous bulk- uous margin line must be drawn as il- head deck where the side shell is carried lustrated in Figure 171.015(d). watertight to a higher deck. A contin-

§ 171.017 One and two compartment son, which is determined in accordance standards of flooding. with § 170.090 of this chapter. (a) One compartment standard of flood- [USCG–2007–0030, 75 FR 78085, Dec. 14, 2010] ing. A vessel is designed to a one compartment standard of flooding if the § 171.050 Passenger heel requirements margin line is not submerged when the for a mechanically propelled or a total buoyancy between each set of two non-self propelled vessel. adjacent main transverse watertight (a) Each mechanically propelled or bulkheads is lost. non-self propelled vessel other than a (b) Two compartment standard of flood- pontoon vessel must be shown by de- ing. A vessel is designed to a two com- sign calculations, in each condition of partment standard of flooding if the loading and operation, to have a margin line is not submerged when the metacentric height (GM) in feet (me- total buoyancy between each set of ters) of not less than the value given by the following equation: three adjacent main transverse watertight bulkheads is lost. GM = [(W/D)(2⁄3)(b)]/(tan(T)) Where— Subpart B—Intact Stability D = displacement of the vessel in long (metric) tons. § 171.045 Weight of passengers and W = total weight in long (metric) tons of per- crew. sons other than required crew, including personal effects of those persons expected (a) This section applies to each ves- to be carried on the vessel. sel, regardless of when constructed. T = 14 degrees or the angle of heel at which (b) Compliance with the intact sta- the deck edge is first submerged, which- bility requirements applicable to each ever is less; and vessel, using a total weight of pas- b = distance in feet (meters) from the center- sengers and crew carried, is based upon line of the vessel to the geometric center of the passenger deck on one side of the an Assumed Average Weight per Per- centerline.

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(b) The criteria specified in para- produce the most unfavorable combina- graph (a) of this section are limited in tion of heel and trim. application to the conditions of loading and operation of vessels for which the [USCG–2007–0030, 75 FR 78085, Dec. 14, 2010] righting arm (GZ) at the angle (T), cal- § 171.055 Intact stability requirements culated after the vessel is permitted to for a monohull sailing vessel or a trim free until the trimming moment monohull auxiliary sailing vessel. is zero, is not less than the minimum metacentric height (GM) calculated in (a) Except as specified in paragraph paragraph (a) of this section multiplied (b) of this section, each monohull sail- by sin(T). In conditions not meeting ing vessel and auxiliary sailing vessel this requirement, the Coast Guard Ma- must be shown by design calculations rine Safety Center requires calcula- to meet the stability requirements in tions in addition to those in this sec- this section. tion. (b) Additional or different stability (c) A vessel that complies with the requirements may be needed for a ves- requirements for passenger ships con- sel of unusual form, proportion, or rig. tained in the International Code of In- The additional requirements, if needed, tact Stability, 2008 (2008 IS Code) (in- will be prescribed by the Commandant. corporated by reference, see § 171.012) (c) Each vessel must have positive need not comply with paragraphs (a) or (b) of this section. Vessels complying righting arms in each condition of with the 2008 IS Code must use the As- loading and operation from— sumed Average Weight per Person ob- (1) 0 to at least 70 degrees of heel for tained according to § 170.090 of this title service on protected or partially pro- to be exempt from the other require- tected waters; and ments of this section. (2) 0 to at least 90 degrees of heel for service on exposed waters. [USCG–2007–0030, 75 FR 78085, Dec. 14, 2010] (d) Each vessel must be designed to § 171.052 Passenger heel requirements satisfy the following equations: for pontoon vessels. (1) For a vessel in service on pro- (a) Each pontoon vessel, in each con- tected or partially protected waters— dition of loading and operation, must have an area under the righting arm 1000(W)HZA ≥ curve from the angle of equilibrium to X an angle of 40 degrees, the (A)(H) downflooding angle, or the angle of the maximum righting arm, whichever is less, of at least: 1000(W)HZB (1) For operation on exposed or par- ≥ Y tially protected waters— (i) 10 foot-degrees with a crowding (A)(H) density of 5 square feet per person (2.15 persons per square meter); and (ii) 7 foot-degrees with a crowding 1000(W)HZC density of 2 square feet per person (5.38 ≥ Z persons per square meter); and (A)(H) (2) For operation on protected waters— where— (i) 5 foot-degrees with a crowding X=1.0 long tons/sq. ft. (10.9 metric tons/sq. density of 5 square feet per person (2.15 meter). persons per square meter); and Y=1.1 long tons/sq. ft. (12.0 metric tons/sq. (ii) 2 foot-degrees with a crowding meter). density of 2 square feet per person (5.38 Z=1.25 long tons/sq. ft. (13.7 metric tons/sq. persons per square meter). meter). (b) When assessing compliance with (2) For a vessel on exposed waters— the criteria of this section, passengers are assumed to be distributed in all areas accessible to passengers so as to

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(ii) The first intercept shown on 1000(W)HZA ≥ Graph 171.055(b) must occur at the X angle of heel corresponding to the (A)(H) angle at which deck edge immersion first occurs. (4) Plot an assumed heeling arm curve on Graph 171.055(c) that satisfies 1000(W)HZB ≥ Y the following conditions: (i) The assumed heeling arm curve (A)(H) must be defined by the equation— HZ=HZB cos2 (T) 1000(W)HZC where— ≥ Z HZ=heeling arm. HZB=heeling arm at 0 degrees of heel. (A)(H) T=angle of heel. where— (ii) The area under the assumed heel- HZA, HZB, and HZC are calculated in the ing arm curve between 0 degrees and manner specified in paragraph (e) or (f) of this section. the downflooding angle or 60 degrees, X=1.5 long tons/sq. ft. (16.4 metric tons/sq. whichever is less, must be equal to the meter). area under the righting arm curve be- Y=1.7 long tons/sq. ft. (18.6 metric tons/sq. tween the same limiting angles. meter). (5) Plot an assumed heeling arm Z=1.9 long tons/sq. ft. (20.8 metric tons/sq. curve on Graph 171.055 (d) or (e) that meter). satisfies the following conditions: A=the projected lateral area or silhouette in (i) The assumed heeling arm curve square feet (meters) of the portion of the must be defined by— vessel above the waterline computed with all sail set and trimmed flat. Sail HZ=HZC cos2 (T) overlap areas need not be included except parachute type spinnakers which are to where— be added regardless of overlap. HZ=heeling arm. H=the vertical distance in feet (meters) from HZC=heeling arm at 0 degrees of heel. the center of A to the center of the un- T=angle of heel. derwater lateral area or approximately (ii) The area under the assumed heel- to the one-half draft point. ing arm curve between the angles of 0 W=the displacement of the vessel in long (metric) tons. and 90 degrees must be equal to the area under the righting arm curve be- (e) Except as provided in paragraph tween 0 degrees and— (f) of this section, HZA, HZB, and HZC (A) 90 degrees if the righting arms must be determined as follows for each are positive to an angle less than or condition of loading and operation: equal to 90 degrees; or (1) Plot the righting arm curve on (B) The largest angle corresponding Graphs 171.055 (b), (c), and (d) or (e). to a positive righting arm but no more (2) If the angle at which the max- than 120 degrees if the righting arms imum righting arm occurs is less than are positive to an angle greater than 90 35 degrees, the righting arm curve degrees. must be truncated as shown on Graph (6) The values of HZA, HZB, and HZC 171.055(a). are read directly from Graphs 171.055 (3) Plot an assumed heeling arm (b), (c), and (d) or (e). curve on Graph 171.055(b) that satisfies (f) For the purpose of this section, the following conditions: the downflooding angle means the stat- (i) The assumed heeling arm curve ic angle from the intersection of the must be defined by the equation— vessel’s centerline and waterline in

2 calm water to the first opening that HZ=HZA cos (T) cannot be rapidly closed watertight. where— (g) HZB and, if the righting arms are HZ=heeling arm. positive to an angle of 90 degrees or HZA=heeling arm at 0 degrees of heel. greater, HZC may be computed from T=angle of heel. the following equation:

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(2) the largest angle corresponding to a I positive righting arm or 90 degrees, HZB (or HZC) = whichever is greater, but no greater than ((T / 2) +14.3sin 2T) 120 degrees when computing HZC. where— T=the downflooding angle or 60 degrees, I=the area under the righting arm curve to— whichever is less, when computing HZB (1) the downflooding angle or 60 degrees, or 90 degrees when computing HZC. whichever is less, when computing HZB; or

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[CGD 79–023, 48 FR 51017, Nov. 4, 1983, as amended by CGD 83–005, 51, FR 924, Jan. 9, 1986]

§ 171.057 Intact stability requirements W=the total displacement of the vessel, in for a sailing catamaran. kilograms (pounds). X=4.88 kilograms/square meter (1.0 pounds/ (a) A sailing vessel that operates on square foot). protected waters must be designed to satisfy the following equation: (b) A sailing vessel that operates on partially protected or exposed waters 01.(WB ) must be designed to satisfy the fol- ≥ X ()()As Hc lowing equation: Where— 01.(WB ) B=the distance between hull centerlines in ≥ X meters (feet). ()()As Hc As=the maximum sail area in square meters Where— (square feet). B=the distance between hull centerlines in Hc=the height of the center of effort of the meters (feet). sail area above the deck, in meters (feet).

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As=the maximum sail area in square meters (b) The factor of subdivision used to (square feet). determine compliance with paragraph Hc=the height of the center of effort of the (a) of this section must be the smaller sail area above the deck, in meters (feet). of 0.5 or the value determined from W=the total displacement of the vessel, in Table 171.065(a) if— kilograms (pounds). (1) The vessel is 430 feet (131 meters) X=7.32 kilograms/square meter (1.5 pounds/ square foot). or more in LBP; and (2) The greater of the values of Y as [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as determined by the following equations amended by CGD 83–005, 51 FR 924, Jan. 9, equals or exceeds the value of X in 1986; CGD 85–080, 61 FR 944, Jan. 10, 1996] Table 171.065(b): Subpart C—Subdivision and (M + 2P) Damage Stability Y= V § 171.060 Watertight subdivision: Gen- or eral. Y = (M + 2P1)/(V + P1¥P) (a) Each of the following vessels must be shown by design calculations to where— comply with the requirements in M, V, and P have the same value as listed in §§ 171.065 through 171.068 for Type I sub- Table 171.065(a); and division: P1=the smaller of the following: (1) Each vessel 100 gross tons or more (i) 0.6LN (0.056LN) where— on an international voyage: and N=the total number of passengers; and (2) Each vessel 150 gross tons or more L=LBP in feet (meters). (ii) The greater of the following: in ocean service. (A) 0.4LN (0.037LN). (b) Each vessel not described in para- (B) The sum of P and the total volume of graph (a) of this section must be shown passenger spaces above the margin by design calculations to comply with line. the requirements in §§ 171.070 to 171.073 (c) The distance A in Figure 171.065 for Type II subdivision. between main transverse watertight (c) Except as allowed in § 171.070(c), bulkheads may exceed the maximum each vessel must have a collision bulk- allowed by paragraphs (a) or (b) of this head. section if each of the distances B and C (d) Each double-ended ferry that is between adjacent main transverse wa- required by paragraph (c) of this sec- tertight bulkheads in Figure 171.065 tion to have a collision bulkhead must does not exceed the smaller of the fol- also have a second collision bulkhead. lowing: One collision bulkhead must be located (1) The floodable length. in each end of the vessel. (2) Twice the separation allowed by [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as paragraphs (a) or (b) of this section. amended by USCG–2007–0030, 75 FR 78085, (d) In each vessel 330 feet (100 meters) Dec. 14, 2010] or more in LBP, one of the main transverse watertight bulkheads aft of the § 171.065 Subdivision requirements— collision bulkhead must be located at a Type I. distance from the forward perpen- (a) Except as provided in paragraphs dicular that is not greater than the (c) and (f) of this section, the separa- maximum separation allowed by para- tion between main transverse water- graph (a) or (b) of this section. tight bulkheads on a vessel, other than (e) The minimum separation between one described in paragraph (b) of this two adjacent main transverse water- section, must not exceed— tight bulkheads must be at least 10 feet (3.05 meters) plus 3 percent of the LBP (floodable length)×(factor of subdivi- of the vessel, or 35 feet (10.7 meters), sion) whichever is less. where— (f) The maximum separation of bulk- the factor of subdivision is listed under FS in heads allowed by paragraphs (a) or (b) Table 171.065(a). of this section may be increased by the

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amount allowed in paragraph (g) of this (2) After the assumed side damage section if— specified in paragraph (h) of this sec- (1) The space between two adjacent tion is applied, the internal watertight main transverse watertight bulkheads volume will not be flooded. contains internal watertight volume; (g) For the purpose of paragraph (f) of and this section, the allowable increase in separation is as follows:

"total volume of allowed local subdivision" Increase in separation = "transverse sectional area at center of compartment"

where— ‘‘total volume of allowed local subdivision’’ is determined by calculating the unflooded volume on each side of the centerline and multiplying the smaller volume by two. (h) The assumed extents of side damage are as follows: (1) The longitudinal extent of damage must be assumed to extend over a length equal to the minimum spacing of bulkheads specified in paragraph (e) of this section. (2) The transverse extent of damage must be assumed to penetrate a distance from the shell plating equal to TABLE 171.065(a) (ENGLISH UNITS) one-fifth the maximum beam of the vessel and at right angles to the cen- Vessel length (LBP) Criterion numeral (CN) FS terline at the level of the deepest sub- CN less than or equal to A division load line. 23. (3) The vertical extent of damage must Vessel length greater than CN greater than 23 and F1 be assumed to extend vertically from 392 feet. less than 123. CN greater than or equal B the baseline to the margin line. to 123. (i) The maximum separation between the following bulkheads must not ex- CN less than or equal to 1 S. ceed the maximum separation between Vessel length greater than CN greater than S and F2 main transverse watertight bulkheads: or equal to 200 feet and less than 123. (1) The collision bulkhead and the less than or equal to first main transverse watertight bulk- 392 feet. CN greater than or equal B head aft of the collision bulkhead; and to 123. (2) The last main transverse watertight bulkhead and the aftermost point Vessel length less than ...... 1 200 feet. on the bulkhead deck. (j) The minimum separation between Where— FS=the factor of subdivision. the following bulkheads must not be CN=60((M+2P)/V)+30000(N/L2) less than the minimum separation be- A=(190/(L¥160))+0.18 B=(94/(L¥85))+0.18 tween main transverse watertight F1=A¥((A¥B)(CN¥23)/100) bulkheads: S=(10904¥25L)/48 F2=1¥((1¥B)(CN¥S)/(123¥S)) (1) The collision bulkhead and the L=the length of the vessel (LBP) in feet. first main transverse watertight bulk- M=the sum of the volume of the machinery space and the volumes of any fuel tanks which are located above the inner head aft of the collision bulkhead; and bottom forward or aft of the machinery space in cubic feet. (2) The last main transverse water- P=the volume of passenger spaces below the margin line. V=the volume of the vessel below the margin line. tight bulkhead and the aftermost point N=the number of passengers that the vessel is to be certifi- on the bulkhead deck. cated to carry.

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TABLE 171.065(a) (METRIC UNITS) permeability given by the formulas in Table 171.066 must be used. Vessel length (LBP) Criterion numeral (CN) FS (2) When doing calculations required CN lesthan or equal to 23 A to demonstrate that compartments on Vessel length greater than CN greater than 23 and F1 opposite sides of a main transverse wa- 120 meters. less than 123. tertight bulkhead that bounds the ma- CN greater than or equal B to 123. chinery space comply with § 171.065(c), the mean of the uniform average CN less than or equal to 1 permeabilities determined from Table S. Vessel length greater than CN greater than S and F2 171.066 for the two compartments must or equal to 61 meters less than 123. be used. and less than or equal (b) If an average permeability can be to 120 meters. CN greater than or equal B calculated that is less than that given to 123. by the formulas in Table 171.066, the lesser value may be substituted if ap- Vessel length less than 61 ...... 1 proved by the Commanding Officer, meters. Marine Safety Center. When deter- Where— mining this lesser value, the following FS=the factor of subdivision. CN=60((M+2P)/V)+2787(N/L2) permeabilities must be used: A=(58/(L–49))+0.18 (1) 95% for passenger, crew, and all B=(29/(L–26))+0.18 F1=A¥((A¥B)(CN¥23)/100) other spaces that, in the full load con- S=(3323.5¥25L)/14.6 dition, normally contain no cargo, F2=1¥((1¥B)(CN¥S)/(123¥S)) L=the length of the vessel (LBP) in meters. stores, provisions, or mail. M=the sum of the volume of the machinery space and the (2) 60% for cargo, stores, provisions, volumes of any fuel tanks which are located above the inner bottom forward or aft of the machinery space in cubic meters. or mail spaces. P=the volume of passenger spaces below the margin line. (3) 85% for spaces containing machin- V=the volume of the vessel below the margin line. N=the number of passengers that the vessel is to be certifi- ery. cated to carry. (4) Values approved by the Com- manding Officer, Marine Safety Center TABLE 171.065(b)—TABLE OF X for double bottoms, oil fuel, and other Vessel LBP in feet (meters) X 1 tanks. (c) In the case of unusual arrange- 430 (131) ...... 1.336 ments, the Commanding Officer, Ma- 440 (134) ...... 1.285 450 (137) ...... 1.230 rine Safety Center may require a de- 460 (140) ...... 1.174 tailed calculation of average perme- 470 (143) ...... 1.117 ability for the portions of the vessel 480 (146) ...... 1.060 490 (149) ...... 1.002 forward or aft of the machinery spaces. 500 (152) ...... 0.944 When doing these calculations, the 510 (155) ...... 0.885 permeabilities specified in paragraph 520 (158) ...... 0.826 530 (162) ...... 0.766 (b) of this section must be used. 540 (165) ...... 0.706 (d) When calculating permeability, 550 (168) ...... 0.645 the total volume of the ‘tween deck 554 (169) and up ...... 0.625 spaces between two adjacent main 1 Interpolate for intermediate values. transverse watertight bulkheads that contains any passenger or crew space [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as must be regarded as passenger space amended by USCG–2007–0030, 75 FR 78085, Dec. 14, 2010] volume, except that the volume of any space that is completely enclosed in § 171.066 Calculation of permeability steel buldheads and is not a crew or for Type I subdivision. passenger space may be excluded. (a) Except as prescribed in paragraph TABLE 171.066—TABLE OF UNIFORM AVERAGE (b) of this section, the following PERMEABILITIES permeabilities must be used when doing the calculations required to dem- Location Uniform average onstrate compliance with § 171.065(a), permeability (b), and (c): 10 (a¥c) (1) When doing calculations required Machinery space ...... 85+lllll to demonstrate compliance with v § 171.065(a) and (b), the uniform average 35(a)

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TABLE 171.066—TABLE OF UNIFORM AVERAGE 1 and 3 must not exceed 90% of the PERMEABILITIES—Continued floodable length or twice the maximum bulkhead separation calculated to dem- Uniform average Location permeability onstrate compliance with § 171.065, whichever is smaller. Volume forward of machinery space ...... 63+lll v (2) Additional watertight bulkheads must be located as shown in Figure 35(a) Volume aft of machinery space ...... 63+lll 171.067(a) so that distances A, B, C, and v D, illustrated in Figure 171.067(a), sat- For each location specified in this table— isfy the following: a=volume below the margin line of all spaces that, in the (i) Distances A and B must not ex- full load condition, normally contain no cargo, baggage, stores, provisions, or mail. ceed the maximum spacing allowed by c=volume below the margin line of the cargo, stores, provisions, or mail spaces within the limits of the machinery space. § 171.065. v=total volume below the margin line. (ii) Distances C and D must not be less than the minimum separation pre- [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as scribed by § 171.065(e). amended by CGD 88–070, 53 FR 34537, Sept. 7, 1988] (3) The distance A, illustrated in Fig- ure 171.067(b), must not exceed the § 171.067 Treatment of stepped and re- maximum length determined in cessed bulkheads in Type I subdivi- § 171.065 corresponding to a margin line sion. taken 3 inches (7.6 cm) below the step. (a) For the purpose of this section— (c) A main transverse bulkhead may (1) The main transverse watertight not be recessed unless all parts of the bulkhead immediately forward of a recess are inboard from the shell of the stepped bulkhead is referred to as bulk- vessel a distance A as illustrated in head 1; and Figure 171.067(c). (2) The main transverse watertight (d) Any part of a recess that lies out- bulkhead immediately aft of the side the limits defined in paragraph (c) stepped bulkhead is referred to as bulk- of this section must be treated as a head 3. (b) If a main transverse watertight step in accordance with paragraph (b) bulkhead is stepped, it and bulkheads 1 of this section. and 3 must meet one of the following (e) The distance between a main conditions: transverse watertight bulkhead and (1) The separation between bulkheads the transverse plane passing through 1 and 3 must not exceed the following: the nearest portion of a recessed bulk- (i) If the factor of subdivision (FS) head must be greater than the min- determined from § 171.065 (a) or (b) is imum separation specified by greater than 0.9, the distance between § 171.065(e). bulkheads 1 and 3 must not exceed the (f) If a main transverse bulkhead is maximum separation calculated to stepped or recessed, equivalent plane demonstrate compliance with § 171.065. bulkheads must be used in the calcula- (ii) If the factor of subdivision is 0.9 tions required to demonstrate compli- or less, the distance between bulkheads ance with § 171.065.

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§ 171.068 Special considerations for persons on board in excess of the life- Type I subdivision for vessels on boat capacity must— short international voyages. (1) Assume the uniform average (a) The calculations done to dem- permeabilities given in Table 171.068 in lieu of those in Table 171.066; and onstrate compliance with § 171.065 for a (2) Use a factor of subdivision (FS) vessel that makes short international that is the smaller of the following: voyages and is permitted under § 75.10– (i) The value from Table 171.065(a). 10 of this chapter to carry a number of (ii) 0.50.

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(b) For a vessel less than 300 feet (91 standard of flooding specified in Table meters) in length, the Commanding Of- 171.070(b). ficer, Marine Safety Center may ap- (c) A ferry vessel described in para- prove the separation of main trans- graph (d) of this section need not meet verse watertight bulkheads greater the standard of flooding specified in than that permitted by paragraph (a) Table 171.070(b), except that a ferry of this section if— vessel in Great Lakes service must at (1) The shorter separation is imprac- least have a collision bulkhead. ticable; and (d) Paragraph (c) of this section ap- (2) The separation is the smallest plies to a ferry vessel that— that is practicable. (1) Is 150 feet (46 meters) or less in (c) In the case of ships less than 180 length; and feet (55 meters) in length, the Com- (2) Has sufficient air tankage, or manding Officer, Marine Safety Center other internal buoyancy to float the may approve a further relaxation in the bulkhead spacing. However, in no vessel with no part of the margin line case may the separation be large submerged when the vessel is com- enough to prevent the vessel from completely flooded. If foam is used to complying with the flooding requirements ply with this paragraph, it must be infor Type II subdivision in § 171.070. stalled in accordance with the requirements in § 170.245 of this subchapter. TABLE 171.068—TABLE OF UNIFORM AVERAGE (e) Except as specified in paragraph PERMEABILITIES (f) of this section, each main transverse watertight bulkhead must be spaced as Uniform average Location permeability follows: (1) Unless otherwise permitted, if the 10 (a¥c) LBP of the vessel is 143 feet (43.5 me- Machinery Space ...... 85+llll v ters) or more, or the vessel makes international voyages, each main 35(b) transverse watertight bulkhead must Volume Forward of Machinery Space ...... 95¥ll v be at least 10 feet (3 meters) plus 3 percent of the vessel’s LBP from— 35(b) (i) Every other main transverse wa- Volume Aft of Machinery Space ...... 95¥lll v tertight bulkhead; For each location specified in this table— (ii) The collision bulkhead; and a=volume below the margin line of all spaces that, in the (iii) The aftermost point on the bulk- full load condition, normally contain no cargo, baggage, stores, provisions, or mail. head deck. b=volume below the margin line and above the tops of (2) If the LBP of the vessel is less floors, inner bottoms, or peak tanks of coal or oil fuel bunkers, chain lockers, fresh water tanks, and of all spaces that, in the than 143 feet (43.5 meters) and the ves- full load condition, normally contain stores, baggage, mail, sel does not make international voy- cargo, or provisions. If cargo holds are not occupied by cargo, no part of the cargo space is to be included in this volume. ages, each main transverse watertight c=volume below the margin line of the cargo, stores, provi- bulkhead must be no less than 10 per- sions, or mail spaces within the limits of the machinery space. v=total volume below the margin line. cent of the vessel’s LBP or 6 feet (1.8 meters), whichever is greater, from— [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as (i) Every other main transverse wa- amended by CGD 88–070, 53 FR 34537, Sept. 7, tertight bulkhead; 1988] (ii) The collision bulkhead; and § 171.070 Subdivision requirements— (iii) The aftermost point on the bulk- Type II. head deck. (a) Each vessel, except a ferry vessel, (f) If a vessel is required by § 171.060 must be designed so that, while in each to have a collision bulkhead in each condition of loading and operation, it end of the vessel, then each main complies with the standard of flooding transverse watertight bulkhead must specified in Table 171.070(a). be no less than the distance specified in (b) Except as provided in paragraph paragraph (e) of this section from— (c), each ferry vessel must be designed (1) Every other main transverse wa- so that, while in each condition of tertight bulkhead; and loading and operation, it meets the (2) Each collision bulkhead.

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TABLE 171.070(a)—STANDARD OF FLOODING § 171.072 Calculation of permeability for Type II subdivision. Stand- ard of When doing calcualtions to show flood- Passengers carried Part of vessel ing compliance with § 171.070, the following (com- uniform average permeabilities must part- ments) be assumed: (a) 85 percent in the machinery space. 400 or less ...... All ...... 1 (b) 60 percent in the following spaces: 401 to 600 ...... All of the vessel forward of the 2 (1) Tanks that are normally filled first MTWB aft of the colli- when the vessel is in the full load con- sion bulkhead.. dition. All remaining portions of the 1 vessel. (2) Chain lockers. (3) Cargo spaces. 601 to 800 ...... All of the vessel forward of the 2 (4) Stores spaces. first MTWB that is aft of a point 40% of the vessel’s (5) Mail or baggage spaces. LBP aft of the forward per- (c) 95 percent in all other spaces. pendicular. All remaining portions of the 1 vessel. § 171.073 Treatment of stepped and recessed bulkheads in Type II sub- 801 to 1000 ...... All of the vessel forward of the 2 division. first MTWB that is aft of a point 60% of the vessel’s (a) A main transverse watertight LBP aft of the forward bulkhead may not be stepped unless ad- prependicular.. ditional watertight bulkheads are lo- All remaining portions of the 1 cated as shown in Figure 171.067(a) so vessel. that the distances A, B, C, and D illus- More than 1000 .... All ...... 2 trated in Figure 171.067(a) comply with Where for this table- the following: ‘‘MTWB’’ means main transverse watertight bulkhead; and (1) A and B must not exceed the max- ‘‘Standard of Flooding‘‘ is explained in § 171.017 of this subchapter. imum bulkhead spacing that permits compliance with § 171.070; and TABLE 171.070(b)—STANDARD OF FLOODING (2) C and D must not be less than the FOR FERRY VESSELS minimum spacing specified in § 171.070(e). Stand- ard of (b) A main transverse watertight flood- bulkhead may not be recessed unless Vessel length Part of vessel ing (com- all parts of the recess are inboard from part- the shell of the vessel as illustrated in ments) Figure 171.067(c). 150 feet (46 meters) All ...... 1 (c) If a main transverse watertight or less. bulkhead is recessed or stepped, an equivalent plane bulkhead must be All of the vessel forward of 2 the first MTWB aft of the used in the calculations required by collision bulkhead. § 171.070. Greater than 150 feet All of the vessel aft of the 2 (46 meters) and first MTWB forward of § 171.075 [Reserved] less than or equal the aft peak bulkhead. to 200 feet (61 meters). § 171.080 Damage stability standards All remaining portions of 1 for vessels with Type I or Type II the vessel. subdivision.

Greater than 200 feet All ...... 2 (a) Calculations. Each vessel with (61 meters). Type I or Type II subdivision must be Where for this table— shown by design calculations to meet ‘‘MTWB’’ means main transverse watertight bulkhead; and the survival conditions in paragraph ‘‘Standard of Flooding’’ is explained in § 171.017 of this subchapter. (e), (f), or (g) of this section in each condition of loading and operation as- [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as suming the extent and character of amended by USCG–2007–0030, 75 FR 78085, damage specified in paragraph (b) of Dec. 14, 2010] this section.

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(b) Extent and character of damage. Passenger Ship Safety Certificate. An ex- For the purpose of paragraph (a) of this isting vessel is presumed to survive as- section, design calculations must assumed damage if it meets the following sume that the damage— conditions in the final stage of flood- (1) Has the character specified in ing: Table 171.080(a); and (1) On a vessel required to survive as- (2) Consists of a penetration having sumed damage with a longitudinal ex- the dimensions specified in Table tent of 10 feet (3 meters) plus 0.03L, the 171.080(a) except that, if the most dis- final angle of equilibrium must not ex- abling penetration would be less than ceed 7 degrees after equalization, ex- the penetration described in the table, cept that the final angle may be as the smaller penetration must be as- large as 15 degrees if— sumed. (i) The vessel is not equipped with (c) Permeability. When doing the cal- equalization or is equipped with fully culations required in paragraph (a) of automatic equalization; and this section, the permeability of each (ii) The Commanding Officer, Marine space must be calculated in a manner Safety Center approves the vessel’s approved by the Commanding Officer, range of stability in the damaged con- Marine Safety Center or be taken from dition. Table 171.080(c). (2) On a vessel required to survive as- (d) Definitions. For the purposes of sumed damage with a longitudinal ex- paragraphs (e) and (f) of this section, tent of 20 feet (6.1 meters) plus 0.04L, the following definitions apply: the angle of equilibrium must not ex- (1) New vessel means a vessel— ceed 15 degrees after equalization. (i) For which a building contract is (3) The margin line may not be sub- placed on or after April 15, 1996; merged at any point. (ii) In the absence of a building con- (4) The vessel’s metacentric height tract, the keel of which is laid, or (GM) must be at least 2 inches (5 cm) which is at a similar stage of construc- when the vessel is in the upright position, on or after April 15, 1996; tion. (iii) The delivery of which occurs on (f) Damage survival for all new vessels or after January 1, 1997; except those vessels authorized to carry (iv) Application for the reflagging of more than 12 passengers on an inter- which is made on or after January 1, national voyage requiring a SOLAS Pas- 1997; or senger Ship Safety Certificate. A new ves- (v) That has undergone— sel is presumed to survive assumed (A) A major conversion for which the damage if it is shown by calculations conversion contract is placed on or to meet the conditions set forth in after April 15, 1996; paragraphs (f) (1) through (7) of this (B) In the absence of a contract, a section in the final stage of flooding major conversion begun on or after and to meet the conditions set forth in April 15, 1996; or paragraphs (f) (8) and (9) of this section (C) A major conversion completed on in each intermediate stage of flooding. or after January 1, 1997. For the purposes of establishing bound- (2) Existing vessel means other than a aries to determine compliance with the new vessel. requirements in paragraphs (f) (1) (3) Watertight means capable of pre- through (9), openings that are fitted venting the passage of water through with weathertight closures and that the structure in any direction under a are not submerged during any stage of head of water for which the sur- flooding will not be considered rounding structure is designed. downflooding points. (4) Weathertight means capable of pre- (1) Each vessel must have positive venting the penetration of water, even righting arms for a minimum range be- boarding seas, into the vessel in any yond the angle of equilibrium as fol- sea condition. lows: (e) Damage survival for all existing ves- Required sels except those vessels authorized to Vessel service range carry more than 12 passengers on an (degrees) international voyage requiring a SOLAS Exposed waters, oceans, or Great Lakes winter .. 15

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Required (B) Each passenger occupies 0.25 Vessel service range square meter of deck area; and (degrees) (C) All passengers are distributed, on Partially protected waters or Great Lakes summer 10 available deck areas unoccupied by Protected waters ...... 5 permanently affixed objects, toward one side of the vessel on the decks (2) No vessel may have any opening where passengers would move to escape through which downflooding can occur from the vessel in case of flooding, so within the minimum range specified by that they produce the most adverse paragraph (f)(1) of this section. heeling moment. (3) Each vessel must have an area under each righting-arm curve of at (iii) The heeling moment due to the least 0.015 meter-radians, measured launching of survival craft is cal- from the angle of equilibrium to the culated assuming that— smaller of the following angles: (A) All survival craft, including (i) The angle at which downflooding davit-launched liferafts and rescue occurs. boats, fitted on the side to which the (ii) The angle of vanishing stability. vessel heels after sustained damage, (4) Except as provided by paragraph are swung out if necessary, fully loaded (f)(5) of this section, each vessel must and ready for lowering; have within the positive range the (B) Persons not in the survival craft greater of a righting arm (GZ) equal to swung out and ready for lowering are or greater than 0.10 meter or a GZ as distributed about the centerline of the calculated using the formula: vessel so that they do not provide additional heeling or righting moments; ⎛ Heeling Moment ⎞ and GZ() m=+ C⎜ 004 . ⎟ (C) Survival craft on the side of the ⎝ Δ ⎠ vessel opposite that to which the vessel where— heels remain stowed. C=1.00 for vessels on exposed waters, oceans, (iv) The heeling moment due to wind or Great Lakes winter; pressure is calculated assuming that— C=0.75 for vessels on partially protected (A) The wind exerts a pressure of 120 waters or Great Lakes summer; Newtons per square meter; C=0.50 for vessels on protected waters; (B) The wind acts on an area equal to D=intact displacement; and the projected lateral area of the vessel Heeling moment=greatest of the heeling moments as calculated in paragraphs (f)(4) above the waterline corresponding to (i) through (iv) of this section. the intact condition; and (C) The lever arm of the wind is the (i) The passenger heeling moment is vertical distance from a point at one- calculated using the formula: half the mean draft, or the center of Passenger Heeling Moment=0.5 (n w b) area below the waterline, to the center of the lateral area. where— (5) Each vessel whose arrangements n=number of passengers; do not generally allow port or star- w = passenger weight used for calculations as determined in accordance with § 170.090(c) board egress may be exempted, by the of this chapter; and Commanding Officer, Marine Safety b=distance from the centerline of the vessel Center, from the transverse passenger to the geometric center on one side of heeling moment required by paragraph the centerline of the passenger deck used (f)(4)(i) of this section. Each vessel ex- to leave the vessel in case of flooding. empted must have sufficient longitu- (ii) The heeling moment due to asym- dinal stability to prevent immersion of metric escape routes for passengers, if the deck edge during forward or aft the vessel has asymmetric escape egress. routes for passengers, is calculated as- (6) Each vessel must have an angle of suming that— equilibrium that does not exceed— (A) The weight of each passenger is (i) 7 degrees for flooding of one com- the weight used for calculations as department; termined in accordance with § 170.090(c) (ii) 12 degrees for flooding of two of this chapter; compartments; or

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(iii) A maximum of 15 degrees for (g) Damage survival for vessels con- flooding of one or two compartments structed before January 1 2009 authorized where— to carry more than 12 passengers on an (A) The vessel has positive righting international voyage requiring a SOLAS arms for at least 20 degrees beyond the Passenger Ship Safety Certificate. A ves- angle of equilibrium; and sel is presumed to survive assumed (B) The vessel has an area under each damage if it is shown by calculations righting-arm curve, when the equi- to comply with the damage stability librium angle is between 7 degrees and required for that vessel by the Inter- 15 degrees, in accordance with the for- national Convention for the Safety of mula: Life at Sea, 1974, as amended, the appli- A≥0.0025(q¥1) cable regulations of IMO Res. MSC.216(82) (incorporated by reference, where— see § 171.012). A=Area required in m-rad under each right- (h) Equalization. (1) Equalization sys- ing-arm curve measured from the angle tems on vessels of 150 gross tons or of equilibrium to the smaller of either more in ocean service must meet the the angle at which downflooding occurs following: or the angle of vanishing stability. q=actual angle of equilibrium in degrees (i) Equalization must be automatic except that the Commanding Officer, (7) The margin line of the vessel must Marine Safety Center may approve not be submerged when the vessel is in other means of equalization if— equilibrium. (A) It is impracticable to make (8) Each vessel must have a max- equalization automatic; and imum angle of equilibrium that does (B) Controls to cross-flooding equip- not exceed 15 degrees during inter- ment are located above the bulkhead mediate stages of flooding. deck. (9) Each vessel must have a range of (ii) Equalization must be fully ac- stability and a maximum righting arm complished within 15 minutes after during each intermediate stage of damage occurs. flooding as follows: (2) Equalization on vessels under 150 Required Required max- gross tons in ocean service and on all Vessel service range imum righting vessels in other than ocean service (degrees) arm must meet the follmwing: Exposed waters, oceans, or (i) Equalization must not depend on Great Lakes winter ...... 7 0.05 m the operation of valves. Partially-protected waters or Great Lakes summer ...... 5 0.035 m (ii) Equalization must be fully ac- Protected waters ...... 5 0 .035 m complished within 15 minutes after damage occurs. Only one breach in the hull and only (3) The estimated maximum angle of one free surface need be assumed when heel before equalization must be ap- meeting the requirements of this para- proved by the Commanding Officer, graph. Marine Safety Center.

TABLE 171.080(a)—EXTENT AND CHARACTER OF DAMAGE

Vessel Transverse desig- Longitudinal penetration 2 Vertical penetration Character of Damage penetration 3,4 nator 1

Z ...... 10 feet (3 meters) plus ).03L or 35 B/5 ...... from the baseline upward Assumes no damage to any main feet (10.7 meters) whichever is without limit. transverse watertight bulkhead. less. 5 Y ...... 10 feet (3 meters) plus )0.03L or B/5 ...... From the baseline upward Assumes damage to no more than 35 feet (10.7 meters) whichever without limit. one main transverse watertight is less. bulkhead. X ...... 10 feet (3 meters) plus )0.03L or B/5 ...... from the baseline upward Assumes damage to no more than 35 feet (10.7 meters whichever without limit. one main transverse watertight is less. bulkhead. 20 feet (6.1 meters) plus 0.04L .... B/5 ...... From the top of the double Assumes damage to no more than bottom upward without one main transverse watertight limit. bulkhead.

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TABLE 171.080(a)—EXTENT AND CHARACTER OF DAMAGE—Continued

Vessel Transverse desig- Longitudinal penetration 2 Vertical penetration Character of Damage penetration 3,4 nator 1

W ...... 20 feet (6.1 meters) plus 0.04L .... B/5 ...... From the baseline upward Assumes damage to at least two without limit. main transverse watertight bulkheads. (1) W,X,Y, and Z are determined from Table 171.080(b). (2) L=LBP of the vessel in feet (meters). (3) B=the beam of the vessel in feet (meters) measured at or below the deepest subdivision load line as defined in § 171.010(b) except that, when doing calculations for a vessel that operates only on inland waters or a ferry vessel, B may be taken as the mean of the maximum beam on the bulkhead deck and the maximum beam at the deepest subdivision load line. (4) The transverse penetration is applied inboard from the side of the vessel, at right angles to the centerline, at the level of the deepest subdivision load line. (5) .1L or 6 feet (1.8 meters) whichever is greater for vessels described in § 171.070(e)(2).

TABLE 171.080(b) (c) Each portion of the collision bulkhead must be at least— Vessel des- Vessel category ignator (1) 5 percent of the LBP from the forward perpendicular in a motor vessel; Vessels with type I subdivision and a factor of W. and subdivision as determined from § 171.065 (a) or (b) of 0.33 or less. (2) 5 feet (1.52 meters) from the for- Vessels with type I subdivision and a factor of X. ward perpendicular in a steam vessel. subdivision as determined from § 171.065 (d) The collision bulkhead must be no (a) or (b) greater than 0.33 and less than or more than 10 feet (3 meters) plus 5 per- equal to 0.50. Vessels with Type II subdivision that are re- Y. cent of the LBP from the forward per- quired to meet a two compartment standard pendicular. of flooding. (e) The collision bulkhead must ex- All other vessels ...... Z. tend to the deck above the bulkhead deck if the vessel— TABLE 171.080(c)—PERMEABILITY (1) Is in ocean service; and (2) Has a superstructure that extends Permeability Spaces and tanks (percent from a point forward of the collision bulkhead to a point at least 15 percent Cargo, coal, stores ...... 60. of the LBP aft of the collision bulk- Accommodations ...... 95. head. Machinery ...... 85. Tanks ...... o or 95.1 (f) The collision bulkhead required by paragraph (e) of this section must have 1 Whichever value results in the more disabling condition. the following characteristics: [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as (1) The portion of the collision bulk- amended by CGD 88–070, 53 FR 34537, Sept. 7, head above the bulkhead deck must be 1988; CGD 89–037, 57 FR 41826, Sept. 11, 1992; weathertight. CGD 94–010, 60 FR 53713, Oct. 17, 1995; CGD 97– (2) If the portion of the collision 057, 62 FR 51049, Sept. 30, 1997; USCG–2007– bulkhead above the bulkhead deck is 29018, 72 FR 53968, Sept. 21, 2007; USCG–2007– not located directly above the collision 0030, 75 FR 78085, Dec. 14, 2010; USCG–2012– bulkhead below the bulkhead deck, 0832, 77 FR 59788, Oct. 1, 2012] then the bulkhead deck between must be weathertight. Subpart D—Additional Subdivision (g) Each opening in the collision Requirements bulkhead must— (1) Be located above the bulkhead § 171.085 Collision bulkhead. deck; and (a) Paragraphs (b) through (g) of this (2) Have a watertight closure. section apply to each vessel of 100 gross (h) Each collision bulkhead— tons or more and paragraphs (h) (1) Must extend to the deck above the through (j) of this section apply to bulkhead deck if in ocean service as de- each vessel that is less than 100 gross fined in § 170.050(f) of this chapter or to tons. the bulkhead deck if in service on (b) The portion of the collision bulk- other waters; head that is below the bulkhead deck (2) May not have watertight doors in must be watertight. it; and

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(3) May have penetrations and open- (b) Except as provided in paragraph ings that— (c) of this section, a vessel required to (i) Are located as high and as far in- have Type I or II subdivision must have board as practicable; and enough main transverse watertight (ii) Except as provided in paragraph bulkheads to separate the machinery (i) of this section, have means to make space from the remainder of the vessel. them watertight. All portions of these bulkheads must (i) Each vessel that is not required to be watertight below the bulkhead deck. comply with a one or two compartment (c) Compliance with paragraph (b) of standard of flooding may have an open- this section is not required if the vessel ing that cannot be made watertight in has sufficient air tanks or other inter- the collision bulkhead below the bulk- nal buoyancy to maintain the vessel head deck if— afloat while in the full load condition (1) The lowest edge of the opening is when all compartments and all other not more than 12 inches (30.5 centi- tanks are flooded. If foam is used to meters) below the bulkhead deck; and comply with this paragraph, it must be (2) There are at least 36 inches (92 installed in accordance with the re- centimeters) of intact collision bulk- quirements in § 170.245 of this sub- head below the lower edge of the open- chapter. ing. (j) Each portion of the collision bulk- § 171.100 Shaft tunnels and stern head must be— tubes. (1) At least 5 percent of the LBP from (a) Stern tubes in each of the fol- the forward perpendicular; and lowing vessels must be enclosed in wa- (2) No more than 15 percent of the tertight spaces: LBP from the forward perpendicular if (1) Each vessel of 100 gross tons or the space forward of the collision bulk- more on an international voyage. head is not subject to damage stability (2) Each other vessel over 150 gross requirements and at any location aft of tons in ocean or Great Lakes service. the location described in paragraph (3) Each vessel under 100 gross tons (j)(1) of this section if the space for- that carries more than 12 passengers on ward of the collision bulkhead is sub- an international voyage. ject to damage stability requirements. (b) The watertight seal in the bulk- [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as head between the stern tube space and amended by CGD 85–080, 61 FR 945, Jan. 10, the machinery space must be located in 1996] a watertight shaft tunnel. The vessel must be designed so that the margin § 171.090 Aft peak bulkhead. line will not be submerged when the (a) Each of the following vessels must watertight shaft tunnel is flooded. have an aft peak bulkhead: (c) If a vessel has two or more shaft (1) Each vessel 100 gross tons or more tunnels, they must be connected by a on an international voyage. watertight passageway. (2) Each other vessel of more than 150 (d) If a vessel has two or less shaft gross tons. tunnels, only one door is permitted be- (b) Except as specified in paragraph tween them and the machinery space. (c) of this section, each portion of the If a vessel has more then two shaft tun- aft peak bulkhead below the bulkhead nels, only two doors are permitted be- deck must be watertight. tween them and the machinery space. (c) A vessel may have an aft peak bulkhead that does not intersect the § 171.105 Double bottoms. bulkhead deck if approved by the Com- (a) This section applies to each vessel manding Officer, Marine Safety Center. that carries more than 12 passengers on [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as an international voyage and all other amended by CGD 88–070, 53 FR 34537, Sept. 7, vessels that are— 1988] (1) 100 gross tons or more; and (2) In ocean or Great Lakes service. § 171.095 Machinery space bulkhead. (b) Each vessel over 165 feet (50 me- (a) This section applies to each vessel ters) and under 200 feet (61 meters) in of 100 gross tons or more. LBP must have a double bottom that

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extends from the forward end of the at the centerline given by the following machinery space to the fore peak bulk- equation: head. (c) Each vessel over 200 feet (61 me- D=18.0+0.05(L) inches ters) and under 249 feet (76 meters) in D=45.7+0.417(L) centimeters LBP must have a double bottom that where— extends from the fore peak bulkhead to D=the depth at the centerline in inches (cen- the forward end of the machinery space timeters). and a double bottom that extends from L=LBP in feet (meters). the aft peak bulkhead to the aft end of the machinery space. (f) The line formed by the intersec- (d) Each vessel 249 feet (76 meters) in tion of the margin plate and the bilge LBP and upward must have a double plating must be above the horizontal bottom that extends from the fore to plane C, illustrated in Figure 171.105, at the aft peak bulkhead. all points. The horizontal plane C is de- (e) Each double bottom required by fined by point B, located, as shown in this section must be at least the depth Figure 171.105, in the midships section.

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(g) A double bottom is not required (2) The vessel makes short inter- in a tank that is integral with the hull national voyages; and of a vessel if— (3) The vessel is permitted by § 75.10– (1) The tank is used exclusively for 10 of this chapter to carry a number of the carriage of liquids; and passengers in excess of the lifeboat ca- (2) It is approved by the Commanding pacity. Officer, Marine Safety Center. (h) A double bottom is not required [CGD 79–023, 48 FR 51017, Nov 4. 1983, as in any part of a vessel where the sepa- amended by CGD 88–070, 53 FR 34532, Sept. 7, 1988] ration of main transverse watertight bulkheads is governed by a factor of § 171.106 Wells in double bottoms. subdivision less than or equal to 0.50 if— (a) This section applies to each vessel (1) The Commanding Officer, Marine that has a well installed in a double Safety Center approves; bottom required by § 171.105.

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(b) Except as provided in paragraph (b) Except in a machinery space, the (c) of this section— means for closing each opening may (1) The depth of a well must be at not be by bolted portable plates. least 18 inches (45.7 cm) less than the (c) If a main transverse watertight depth of the double bottom at the cen- bulkhead is penetrated, the penetra- terline; and tion must be made watertight. Lead or (2) The well may not extend below other heat sensitive materials must the horizontal plane C illustrated in not be used in a system that penetrates Figure 171.105. a main transverse watertight bulkhead (c) A well may extend to the outer if fire damage to this system would re- bottom of a double bottom at the after duce the watertight integrity of the end of a shaft tunnel. bulkhead. (d) A main transverse watertight § 171.108 Manholes in double bottoms. bulkhead must not be penetrated by valves or cocks unless they are a part (a) The number of manholes in the of a piping system. inner bottom of a double bottom re- (e) If a pipe, scupper, or electric cable quired by § 171.105 must be reduced to passes through a main transverse wa- the minimum required for adequate ac- tertight bulkhead, the opening through cess. which it passes must be watertight. (b) Each manhole must have a cover (f) A main transverse watertight that can be— bulkhead may not have non-watertight (1) Made watertight; and penetrations below the bulkhead deck (2) Protected from damage by cargo unless— or coal. (1) The margin line is more than 9 inches (23 centimeters) below the bulk- § 171.109 Watertight floors in double head deck at the intersection of the bottoms. margin line and the line formed by the If a vessel is required to have a dou- intersection of the plane of the main ble bottom, a watertight transverse di- transverse watertight bulkhead and vision must be located in the double the shell; and bottom under each main transverse wa- (2) Making all penetrations water- tertight bulkhead or as near as prac- tight is impracticable. ticable to the main transverse water- (g) Penetrations approved in accord- tight bulkhead. If a vessel also has ance with paragraph (f) of this section duct keels, the transverse divisions must comply with the following: need not extend across them. (1) The bottom of the penetration must not be located— Subpart E—Penetrations and (i) More than 24 inches (61 centi- Openings in Watertight Bulkheads meters) below the bulkhead deck; nor (ii) Less than 9 inches (23 centi- § 171.110 Specific applicability. meters) above the margin line. (2) The penetration must not be lo- (a) Sections 171.111, 171.112, and cated outboard from the centerline 171.113 apply to each vessel of 100 gross more than 1⁄4 of the beam of the vessel tons or more. measured— (b) Section 171.114 applies to each (i) On the bulkhead deck; and vessel under 100 gross tons. (ii) In the vertical plane of the pene- [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as tration. amended by CGD 85–080, 61 FR 945, Jan. 10, (h) No doors, manholes, or other ac- 1996; 62 FR 51353, Sept. 30, 1997] cess openings may be located in a watertight bulkhead that separates two § 171.111 Penetrations and openings in cargo spaces or a cargo space and a per- watertight bulkheads in vessels of manent or reserve bunker. 100 gross tons or more. (a) Except as provided in paragraph § 171.112 Watertight door openings. (f) of this section, each opening in a (a) The opening for a watertight door watertight bulkhead must have a must be located as high in the bulk- means to close it watertight. head and as far inboard as practicable.

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(b) No more than one door, other (c) Each main traverse watertight than a door to a bunker or shaft alley, bulkhead must extend to the bulkhead may be fitted in a main transverse wa- deck. tertight bulkhead within spaces con- [CGD 85–080, 62 FR 51353, Sept. 30, 1997] taining the following: (1) Main and auxiliary propulsion ma- Subpart F—Openings in the Side chinery. (2) Propulsion boilers. of a Vessel Below the Bulk- (3) Permanent bunkers. head or Weather Deck § 171.115 Specific applicability. § 171.113 Trunks. (a) Sections 171.116, 171.117, and (a) For the purpose of this section, 171.118 apply to each vessel of 100 gross ‘‘trunk’’ means a large enclosed pas- tons or more. sageway through any deck or bulkhead (b) Section 171.119 applies to each of a vessel. vessel under 100 gross tons. (b) Each trunk, other than those specified in paragraph (c) of this sec- [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as amended by CGD 85–080, 61 FR 945, Jan. 10, tion, must have a watertight door at 1996; 62 FR 51353, Sept. 30, 1997] each end except that a trunk may have a watertight door at one end if— § 171.116 Port lights. (1) The trunk does not pass through (a) A vessel may have port lights more than one main compartment; below the bulkhead deck if— (2) The sides of the trunk are not (1) It is greater than 150 gross tons; nearer to the shell than is permitted by and § 171.067(c) for the sides of a recess in a (2) It is in ocean service. bulkhead; and (b) All port lights in a space must be (3) The vessel complies with the sub- non-opening if the sill of any port light division requirements in this part when in that space is below a line that— the volume of the trunk is included (1) Is drawn parallel to the line with the volume of the compartment formed by the intersection of the bulk- into which it opens. head deck and the shell of the vessel; (c) Each trunk that provides access and from a crew accommodation space and (2) Has its lowest point 21⁄2 percent of that passes through a main transverse the beam of the vessel above the deep- watertight bulkhead must comply with est subdivision load line. the following: (c) For the purpose of paragraph (b) (1) The trunk must be watertight. of this section, the beam of the vessel (2) The trunk, if used for passage at is measured at or below the deepest sea, must have at least one end above subdivision load line. the margin line and access to the other (d) Except as provided in paragraph end of the trunk must be through a wa- (e) of this section, no port light may be tertight door. located in a space that is used exclusively for the carriage of cargo, stores, (3) The trunk must not pass through or coal. the first main transverse watertight (e) A port light may be located in a bulkhead aft of the collision bulkhead. space used alternately for the carriage of cargo or passengers. § 171.114 Penetrations and openings in watertight bulkheads in a vessel (f) Each port light installed below the less than a 100 gross tons. bulkhead deck must conform to the following requirements: (a) Penetrations and openings in wa- (1) The design of each port light must tertight bulkheads must— be approved by the Commanding Offi- (1) Be kept as high and as far inboard cer, Marine Safety Center. as practicable; and (2) Each non-opening port light must (2) Have means to make them water- be watertight. tight. (3) Each opening port light must be (b) Watertight bulkheads must not constructed so that it can be secured have sluice valves. watertight.

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(4) Each opening port light must be and similar opening in the side of a installed with at least one bolt that is vessel must be approved by the Com- secured by a round slotted or recessed manding Officer, Marine Safety Center. nut that requires a special wrench to (c) In no case may the lowest point of remove. The nut must be protected by any gangway, cargo and coaling port, a sleeve or guard to prevent it from or similar opening be below the deepest being removed with ordinary tools. subdivision load line. [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as amended by CGD 88–070, 53 FR 34537, Sept. 7, amended by CGD 88–070, 53 FR 34537, Sept. 7, 1988] 1988] § 171.117 Dead covers. § 171.119 Openings below the weather (a) Except as provided in paragraph deck in the side of a vessel less (b) of this section, each port light with than 100 gross tons. the sill located below the margin line must have a hinged, inside dead cover. (a) If a vessel operates on exposed or (b) The dead cover on a port light lo- partially protected waters, an opening cated in an accommodation space for port light is not permitted below the passengers other than steerage pas- weather deck unless— sengers may be portable if— (1) The sill is at least 30 inches (76.2 (1) The apparatus for stowing the centimeters) above the deepest subdivi- dead cover is adjacent to its respective sion load line; and port light; (2) It has an inside, hinged dead (2) The port light is located above the cover. deck that is immediately above the (b) Except for engine exhausts, each deepest subdivision load line; inlet or discharge pipe that penetrates (3) The port light is aft of a point the hull below a line drawn parallel to one-eighth of the LBP of the vessel and at least 6 inches (15.2 centimeters) from the forward perpendicular; and above the deepest subdivision load line (4) The port light is above a line must have means to prevent water that— from entering the vessel if the pipe (i) Is parallel to the line formed by the intersection of the bulkhead deck fractures or otherwise fails. and the side of the vessel; and (c) A positive action valve or cock (ii) Has its lowest point at a height of that is located as close as possible to 12 feet (3.66 meters) plus 21⁄2 percent of the hull is an acceptable means for the beam of the vessel above the deep- complying with paragraph (b) of this est subdivision load line. section. (c) For the purpose of paragraph (b) (d) If an inlet or discharge pipe is in- of this section, the beam of the vessel accessible, the means for complying is measured at or below the deepest with paragraph (b) of this section must subdivision load line. be a shut-off valve that is— (d) Each dead cover must be designed (1) Operable from the weather deck or so that— other accessible location above the (1) It can be secured watertight; and bulkhead deck; and (2) It is not necessary to release any (2) Labeled at the operating point for of the special nuts required in identity and direction of closing. § 171.116(f)(4) in order to secure the dead cover. (e) Any connecting device or valve in a hull penetration must not be cast § 171.118 Automatic ventilators and iron. side ports. (f) Each plug cock in an inlet or dis- (a) An automatic ventilator must not charge pipe must have a means, other be fitted in the side of a vessel below than a cotter pin, to prevent its loos- the bulkhead deck unless approved by ening or removal from the body. the Commanding Officer, Marine Safe- [CGD 85–080, 62 FR 51353, Sept. 30, 1997] ty Center. (b) The design and construction of each gangway, cargo and coaling port,

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Subpart G—Watertight Integrity § 171.124 Watertight integrity above Above the Margin Line the margin line in a vessel less than 100 gross tons. § 171.120 Specific applicability. (a) Each hatch exposed to the weath- Each vessel that is 100 gross tons or er must be watertight; except that, the more must comply with § 171.122 and following hatches may be weather- each vessel under 100 gross tons must tight: comply with § 171.124. (1) Each hatch on a watertight trunk that extends at least 12 inches (30.5 [CGD 85–080, 62 FR 51354, Sept. 30, 1997] centimeters) above the weather deck. (2) Each hatch in a cabin top. § 171.122 Watertight integrity above the margin line in a vessel of 100 (3) Each hatch on a vessel that oper- gross tons or more. ates only on protected waters. (b) Each hatch cover must— (a) For the purpose of this section, a partial watertight bulkhead is one in (1) Have securing devices; and which all portions are not watertight. (2) Be attached to the hatch frame or (b) Except as provided in paragraph coaming by hinges, captive chains, or (d) of this section, the bulkhead deck to other devices to prevent its loss. or a deck above it must be weather- (c) Each hatch that provides access tight. to crew or passenger accommodations (c) Partial watertight bulkheads or must be operable from either side. web frames must be located in the im- (d) Except as provided in paragraph mediate vicinity of main transverse (e) of this section, a weathertight door watertight bulkheads to minimize as with permanent watertight coamings much as practicable the entry and that comply with the height require- spread of water above the bulkhead ments in table 171.124(d) must be pro- deck. vided for each opening located in a (d) If a partial watertight bulkhead deck house or companionway that— or web frame is located on the bulk- (1) Gives access into the hull; and head deck in order to comply with (2) Is located in— paragraph (c) of this section, the joint (i) A cockpit; between it and the shell and bulkhead (ii) A well; or deck must be watertight. (iii) An exposed location on a flush (e) If a partial watertight bulkhead deck vessel. does not line up with a main transverse watertight bulkhead below the bulk- TABLE 171.124(d) head deck, the bulkhead deck between Route Height of coaming them must be watertight. (f) Each opening in an exposed weath- Exposed or partially protected 6 inches (15.2 centimeters). Protected ...... 3 inches (7.6 centimeters). er deck must— (1) Have a coaming that complies (e) If an opening in a location speci- with the height requirements in table fied in paragraph (d) of this section is 171.124(d); and provided with a Class 1 watertight (2) Have a means for closing it weath- door, the height of the watertight coa- ertight. ming need only be sufficient to accom- (g) Each port light located between modate the door. the bulkhead deck and the next deck above the bulkhead deck must have an [CGD 85–080, 62 FR 51354, Sept. 30, 1997] inside dead cover than can be secured watertight. Subpart H—Drainage of Weather Decks [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as amended by CGD 85–080, 61 FR 945, Jan. 10, § 171.130 Specific applicability. 1996; 62 FR 51354, Sept. 30, 1997] (a) Section 171.135 applies to each vessel that is 100 gross tons or more.

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(b) Sections 171.140, 171.145, 171.150, A = the combined area of the scuppers in and 171.155 apply to each vessel under square inches (square centimeters). 100 gross tons. D = the area of the cockpit in square feet (square meters). [CGD 79–023, 48 FR 51017, Nov. 4, 1983, as amended by CGD 85–080, 61 FR 945, Jan. 10, (e) The cockpit deck of a vessel that 1996; 62 FR 51354, Sept. 30, 1997] operates on exposed or partially protected waters must be at least 10 § 171.135 Weather deck drainage on a inches (24.5 centimeters) above the vessel of 100 gross tons or more. deepest subdivision load line, unless The weather deck must have freeing the vessel complies with— ports, open rails, and scuppers, as nec- (1) The intact stability requirements essary, to allow rapid clearing of water of § 171.150; under all weather conditions. (2) The Type II subdivision requirements in §§ 171.070, 171.072, and 171.073; § 171.140 Drainage of a flush deck ves- and sel. (3) The damage stability require- (a) Except as provided in paragraph ments in § 171.080. (b) of this section, the weather deck on (f) The cockpit deck of all vessels a flush deck vessel must be watertight that do not operate on exposed or par- and have no obstruction to overboard tially protected waters must be located drainage. as high above the deepest subdivision (b) Each vessel with a flush deck may load line as practicable. have solid bulwarks in the forward one- third length of the vessel if— [CGD 85–080, 62 FR 51354, Sept. 30, 1997] (1) The bulwarks do not form a well § 171.150 Drainage of a vessel with a enclosed on all sides; and well deck. (2) The foredeck of the vessel has sufficient sheer to ensure drainage aft. (a) Each well deck on a vessel must be watertight. [CGD 85–080, 62 FR 51354, Sept. 30, 1997] (b) Except as provided in paragraphs § 171.145 Drainage of a vessel with a (c) and (d) of this section, the area re- cockpit. quired for freeing ports in the bulwarks that form a well must be determined as (a) Except as follows, the cockpit follows: must be watertight: (1) If a vessel operates on exposed or (1) A cockpit may have companion- partially protected waters, it must ways if they comply with § 171.124(d). have at least 100 percent of the freeing (2) A cockpit may have ventilation port area derived from table 171.150. openings along its inner periphery if— (i) The vessel operates only on pro- (2) If a vessel operates only on protected or partially protected waters; tected or partially protected waters (ii) The ventilation openings are lo- and complies with the requirements in cated as high as possible in the side of the following sections for a vessel that the cockpit; and operates on exposed waters, it must (iii) The height of the ventilation have at least 50 percent of the freeing opening does not exceed 2 inches (5 cen- port area derived from table 171.150: timeters). (i) The intact stability requirements (b) The cockpit must be designed to of § 171.030 or 171.050 and § 171.170. be self-bailing. (ii) The subdivision requirements of (c) Scuppers installed in a cockpit § 171.040, 171.043, or 171.070. must be located to allow rapid clearing (iii) The damage stability require- of water in all probable conditions of ments of § 171.080. list and trim. (3) If a vessel operates only on pro- (d) Scuppers must have a combined tected waters, the freeing port area area of at least the area given by either must be at least equal to the scupper of the following equations: area required by § 171.145(d) for a cockpit of the same size. A=0.1(D) square inches. (c) The freeing ports must be located A=6.94(D) square centimeters. to allow rapid clearing of water in all Where— probable conditions of list and trim.

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(d) If a vessel that operates on ex- 172.070 Intact stability. posed or partially protected waters does not have free drainage from the Subpart E—Special Rules Pertaining to a foredeck aft, then the freeing port area Barge That Carries a Hazardous Liquid must be derived from table 171.150 Regulated Under Subchapter O of This using the entire bulwark length rather Chapter than the bulwark length in the after 172.080 Specific applicability. two-thirds of the vessel as stated in the 172.085 Hull type. table. 172.087 Cargo loading assumptions. 172.090 Intact transverse stability. TABLE 171.150 172.095 Intact longitudinal stability. Height of solid bulwark in inches (centi- Freeing port 172.100 Watertight integrity. meters) area 1,2 172.103 Damage stability. 172.104 Character of damage. 6(15) ...... 2(42.3) 12(30) ...... 4(84.7) 172.105 Extent of damage. 18(46) ...... 8(169.3) 172.110 Survival conditions. 24(61) ...... 12(253.9) 30(76) ...... 16(338.6) Subpart F—Special Rules Pertaining to a 36(91) ...... 20(423.2) Ship That Carries a Hazardous Liquid 1 Intermediate values of freeing port area can be obtained Regulated Under Subchapter O of This by interpolation. 2 In square inches per foot (square centimeters per meter) Chapter of bulwark length in the after 2⁄3 of the vessel. 172.125 Specific applicability. [CGD 85–080, 62 FR 51354, Sept. 30, 1997] 172.127 Definitions. 172.130 Calculations. § 171.155 Drainage of an open boat. 172.133 Character of damage. 172.135 Extent of damage. The deck within the hull of an open 172.140 Permeability of spaces. boat must drain to the bilge. Overboard 172.150 Survival conditions. drainage of the deck is not permitted. [CGD 85–080, 62 FR 51355, Sept. 30, 1997] Subpart G—Special Rules Pertaining to a Ship That Carries a Bulk Liquefied Gas PART 172—SPECIAL RULES Regulated Under Subchapter O of This PERTAINING TO BULK CARGOES Chapter 172.155 Specific applicability. Subpart A—General 172.160 Definitions. 172.165 Intact stability calculations. Sec. 172.170 Damage stability calculations. 172.005 Applicability. 172.175 Character of damage. 172.180 Extent of damage. Subpart B—Bulk Grain 172.185 Permeability of spaces. 172.010 Applicability. 172.195 Survival conditions. 172.015 Document of authorization. 172.205 Local damage. 172.020 Incorporation by reference. 172.030 Exemptions for certain vessels. Subpart H—Special Rules Pertaining to 172.040 Certificate of loading. Great Lakes Dry Bulk Cargo Vessels

Subpart C—Special Rules Pertaining to a 172.215 Specific applicability. Barge That Carries a Cargo Regulated 172.220 Definitions. Under Subchapter D of This Chapter 172.225 Calculations. 172.230 Character of damage. 172.047 Specific applicability. 172.235 Extent of damage. 172.048 Definitions. 172.240 Permeability of spaces. 172.050 Damage stability. 172.245 Survival conditions.

Subpart D—Special Rules Pertaining to a AUTHORITY: 46 U.S.C. 3306, 3703, 5115; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Vessel That Carries a Cargo Regulated Department of Homeland Security Delega- Under 33 CFR Part 157 tion No. 0170.1.

172.060 Specific applicability. SOURCE: CGD 79–023, 48 FR 51040, Nov. 4, 172.065 Damage stability. 1983, unless otherwise noted.

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Subpart A—General ization was issued before January 1, 1994. § 172.005 Applicability. (b) The Commandant recognizes the This part applies to each vessel that National Cargo Bureau, Inc., 17 Battery carries one of the following cargoes in Place, Suite 1232, New York, New York bulk: 10004–1110, for the purpose of issuing (a) Grain. Documents of Authorization in accord- (b) A cargo listed in Table 30.25–1 of ance with paragraph (a)(1) of this sec- this chapter. tion. (c) A cargo regulated under 33 CFR [CGD 95–028, 62 FR 51218, Sept. 30, 1997, as part 157. amended by USCG–2007–29018, 72 FR 53968, (d) A cargo listed in Table 151.01–10(b) Sept. 21, 2007] of this chapter. (e) A cargo listed in Table I of part § 172.020 Incorporation by reference. 153 of this chapter. (a) Certain material is incorporated (f) A cargo listed in Table 4 of part by reference into this part with the ap- 154 of this chapter. proval of the Director of the Federal (g) Any dry bulk cargo carried in a Register under 5 U.S.C. 552(a) and 1 new Great Lakes vessel. CFR part 51. To enforce any edition [CGD 79–023, 48 FR 51040, Nov. 4, 1983, as other than that specified in this sec- amended by CGD 80–159, 51 FR 33059, Sept. 18, tion, the Coast Guard must publish a 1986] notice of change in the FEDERAL REG- ISTER and the material must be avail- Subpart B—Bulk Grain able to the public. All approved material is available for inspection at the National Archives and Records Admin- SOURCE: CGD 95–028, 62 FR 51218, Sept. 30, 1997, unless otherwise noted. istration (NARA). For information on the availability of this material at § 172.010 Applicability. NARA, call 202–741–6030 or go to http:// www.archives.gov/federallregister/ This subpart applies to each vessel code of federal regulations/ that loads grain in bulk, except vessels l l l It is also available engaged solely on voyages on rivers, ibrllocations.html. lakes, bays, and sounds or on voyages for inspection at the Coast Guard, Of- between Great Lake ports and St. Law- fice of Design and Engineering Stand- rence River ports as far east as a ards, Naval Architecture Division (CG– straight line drawn from Cape de ENG–2), 2100 2nd St., SW., Stop 7126, Rosiers to West Point, Anticosti Island Washington, DC 20593–7126, and is avail- and as far east of a line drawn along able from the sources listed below. the 63rd meridian from Anticosti Island (b) International Maritime Organiza- to the north shore of the St. Lawrence tion (IMO), Publications Section, 4 Al- River. bert Embankment, London SE1 7SR, United Kingdom, +44 (0)20 7735 7611, § 172.015 Document of authorization. http://www.imo.org/. (a) Except as specified in § 172.030, (1) Amendment to Chapter VI of the each vessel that loads grain in bulk International Convention for the Safe- must have a Document of Authoriza- ty of Life at Sea, 1960, Resolution tion issued in accordance with one of A.264(VIII), incorporation by reference the following: (IBR) approved for § 172.015. (1) Section 3 of the International (2) Publication No. 240–E, Inter- Code for the Safe Carriage of Grain in national Code for the Safe Carriage of Bulk if the Document of Authorization Grain in Bulk, IBR approved for is issued on or after January 1, 1994. As § 172.015. used in the Code, the term ‘‘Adminis- (3) Resolution MEPC.117(52), Amend- tration’’ means ‘‘U.S. Coast Guard’’. ments to the Annex of the Protocol of (2) Regulation 10 part (a) of the 1978 Relating to the International Con- Annex to IMO Assembly resolution vention for the Prevention of Pollution A.264(VIII) if the Document of Author- from Ships, 1973 (IMO Res.

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MEPC.117(52)), Adopted on 15 October SF=Stowage factor of grain in compartment 2004, IBR approved for § 172.070. (cubic meters/tons) [USCG–2007–0030, 75 FR 78086, Dec. 14, 2010, as (c) Vessels which do not have the amended by USCG–2012–0832, 77 FR 59788, Oct. Document of Authorization required by 1, 2012] § 172.015 may carry grain in bulk up to one third of their deadweight tonnage § 172.030 Exemptions for certain ves- provided the stability complies with sels. the requirements of Section 9 of the (a) Vessels are exempt from 172.015 on International Code for the Safe Car- voyages between: riage of Grain in Bulk. (1) United States ports along the East Coast as far south as Cape Henry, § 172.040 Certificate of loading. VA; (a) Before it sails, each vessel that (2) Wilmington, NC and Miami, FL; loads grain in bulk, except vessels en- (3) United States ports in the Gulf of gaged solely on voyages on the Great Mexico; Lakes, rivers, or lakes, bays, and (4) Puget Sound ports and Canadian sounds, must have a certificate of load- west coast ports or Columbia River ing issued by an organization recog- ports, or both; nized by the Commandant for that pur- (5) San Francisco, Los Angeles, and pose. The certificate of loading may be San Diego, CA. accepted as prima facie evidence of (b) Vessels exempt by paragraph (a) compliance with the regulations in this of this section must comply with the subpart. following conditions: (b) The Commandant recognizes the (1) The master is satisfied that the National Cargo Bureau, Inc., 17 Battery vessel’s longitudinal strength is not Place, Suite 1232, New York, New York impaired. 10004–1110, for the purpose of issuing (2) The master ascertains the weath- certificates of loading. er to be encountered on the voyage. [CGD 95–028, 62 FR 51218, Sept. 30, 1997, as (3) Potential heeling moments are re- amended by USCG–2007–29018, 72 FR 53968, duced to a minimum by carrying as few Sept. 21, 2007] slack holds as possible. (4) Each slack surface must be lev- Subpart C—Special Rules Per- eled. taining to a Barge That Carries (5) The transverse metacentric height (GM), in meters, of the vessel through- a Cargo Regulated Under out the voyage, after correction for liq- Subchapter D of This Chap- uid free surface, has been shown by sta- ter bility calculations to be in excess of the required GM (GMR), in meters. § 172.047 Specific applicability. (i) The GMR is the sum of the incre- This section applies to each tank ments of GM (GMI) multiplied by the barge that carries, in independent correction factor, f and r. tanks described in § 151.15–1(b) of this Where: chapter, a cargo listed in Table 30.25–1 of this chapter that is a— r=(available freeboard) (beam) of the vessel and (a) Liquefied flammable gas; or f=1 if r is > 0.268 or (b) Flammable liquid that has a Reid f=(0.268 r) if r is < 0.268. vapor pressure in excess of 25 pounds per square inch (172.4 KPa). (ii) The GMI for each compartment which has a slack surface of grain, i.e., § 172.048 Definitions. is not trimmed full, is calculated by As used in this subpart— the following formula: MARPOL 73/38 means the Inter- GMI=(B3×L×0.0661)(Disp.×SF)) national Convention for the Prevention of Pollution from Ships, 1973, as modi- where: fied by the Protocol of 1978 relating to B=breadth of slack grain surface (m that Convention. L=Length of compartment (m) Disp.=Displacement of vessel (tons) [USCG–2000–7641, 66 FR 55574, Nov. 2, 2001]

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§ 172.050 Damage stability. any location except to a transverse watertight bulkhead. (a) Each tank barge is assigned a hull (f) For the purpose of paragraph (e) of type number by the Commandant in this section— accordance with § 32.63–5 of this chap- (1) Design calculations must include ter. The requirements in this section both side and bottom damage, applied are specified according to the hull type separately; and number assigned. (2) Damage must consist of the most (b) Except as provided in paragraph disabling penetration up to and includ- (c) of this section, each Type I and II ing penetrations having the following barge hull must have a watertight dimensions: weather deck. (i) Side damage must be assumed to (c) If a Type I or II barge hull has an be as follows: open hopper, the fully loaded barge (A) Longitudinal extent—6 feet (183 must be shown by design calculations centimeters). to have at least 2 inches (50mm) of (B) Transverse extent—30 inches (76 positive GM when the hopper space is centimeters). flooded to the height of the weather (C) Vertical extent—from the base- deck. line upward without limit. (d) When demonstrating compliance (ii) Bottom damage must be assumed with paragraph (c) of this section, cred- to be 15 inches (38.1 centimeters) from it may be given for the buoyancy of the the baseline upward. immersed portion of cargo tanks if the tank securing devices are shown by de- Subpart D—Special Rules Per- sign calculations to be strong enough to hold the tanks in place when they taining to a Vessel That Car- are subjected to the buoyant forces re- ries a Cargo Regulated Under sulting from the water in the hopper. 33 CFR Part 157 (e) Each tank barge must be shown § 172.060 Specific applicability. by design calculations to have at least 2 inches (50 mm) of positive GM in each This subpart applies to each U.S. condition of loading and operation tank vessel that is required to comply after assuming the damage specified in with 33 CFR 157.21. paragraph (f) of this section is applied [CGD 90–051, 57 FR 36246, Aug. 12, 1992] in the following locations: (1) Type I barge hull not in an inte- § 172.065 Damage stability. grated tow. If a Type I hull is required (a) Definitions. As used in this sec- and the barge is not a box barge de- tion, Length or L means load line signed for use in an integrated tow, de- length (LLL). sign calculations must show that the (b) Calculations. Each tank vessel barge hull can survive damage at any must be shown by design calculations location including on the intersection to meet the survival conditions in of a transverse and longitudinal water- paragraph (g) of this section in each tight bulkhead. condition of loading and operation ex- (2) Type I barge hull in an integrated cept as specified in paragraph (c) of tow. If a Type I hull is required and the this section, assuming the damage barge is a box barge designed for oper- specified in paragraph (d) of this sec- ation in an integrated tow, design cal- tion. culations must show that the barge can (c) Conditions of loading and operation. survive damage— The design calculations required by (i) To any location on the bottom of paragraph (b) of this section need not the tank barge except on a transverse be done for ballast conditions if the watertight bulkhead; and vessel is not carrying oil, other than (ii) To any location on the side of the oily residues, in cargo tanks. tank barge including on a transverse (d) Character of damage. (1) If a tank watertight bulkhead. vessel is longer than 738 feet (225 (3) Type II hull. If a Type II hull is re- metes) in length, design calculations quired, design calculations must show must show that it can survive damage that the barge can survive damage to at any location.

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(2) If a tank vessel is longer than 492 (3) If a cargo tank would be pene- feet (150 meters) in length, but not trated under the assumed damage, the longer than 738 feet (225 meters), design cargo tank must be assumed to lose all calculations must show that it can sur- cargo and refill with salt water, or vive damage at any location except the fresh water if the vessel operates solely transverse bulkheads bounding an aft on the Great Lakes, up to the level of machinery space. The machinery space the tank vessel’s final equilibrium wa- is calculated as a single floodable com- terline. partment. (g) Survival conditions. A vessel is pre- (3) If a tank vessel is 492 feet (150 me- sumed to survive assumed damage if it ters) or less in length, design calcula- meets the following conditions in the tions must show that it can survive final stage of flooding: damage— (1) Final waterline. The final water- (i) At any location between adjacent line, in the final condition of sinkage, main transverse watertight bulkheads heel, and trim, must be below the lower except to an aft machinery space; edge of an opening through which pro- (ii) To a main transverse watertight gressive flooding may take place, such bulkhead spaced closer than the longi- as an air pipe, or an opening that is tudinal extent of collision penetration closed by means of a weathertight door specified in Table 172.065(a) from an- or hatch cover. This opening does not other main transverse watertight bulk- include an opening closed by a— head; and (i) Watertight manhole cover; (ii) Flush scuttle; (iii) To a main transverse watertight (iii) Small watertight cargo tank bulkhead or a transverse watertight hatch cover that maintains the high bulkhead bounding a side tank or dou- integrity of the deck; ble bottom tank if there is a step or a (iv) Class 1 door in a watertight bulk- recess in the transverse bulkhead that head within the superstructure; is longer than 10 feet (3.05 meters) and (v) Remotely operated sliding water- that is located within the extent of tight door; or penetration of assumed damage. The (vi) Side scuttle of the non-opening step formed by the after peak bulkhead type. and after peak tank top is not a step (2) Heel angle. The maximum angle of for the purpose of this regulaton. heel must not exceed 25 degrees, except (e) For the purpose Extent of damage. that this angle may be increased to 30 of paragraph (b) of this section— degrees if no deck edge immersion oc- (1) Design calculations must include curs. both side and bottom damage, applied (3) Range of stability. Through an separately; and angle of 20 degrees beyond its position (2) Damage must consist of the pene- of equilibrium after flooding, a tank trations having the dimensions given vessel must meet the following condi- in Table 172.065(a) except that, if the tions: most disabling penetrations would be (i) The righting arm curve must be less than the penetrations described in positive. this paragraph, the smaller penetration (ii) The maximum righting arm must must be assumed. be at least 3.94 inches (10 cm). (f) Permeability of spaces. When doing (iii) Each submerged opening must be the calculations required in paragraph weathertight. (b) of this section— (4) Progressive flooding. Pipes, ducts or (1) The permeability of a floodable tunnels within the assumed extent of space, other than a machinery space, damage must be either— must be as listed in Table 172.065(b); (i) Equipped with arrangements such (2) Calculations in which a machin- as stop check valves to prevent pro- ery space is treated as a floodable gressive flooding to other spaces with space must be based on an assumed ma- which they connect; or chinery space permeability of 85%, un- (ii) Assumed in the design calcula- less the use of an assumed permeability tions required in paragraph (b) of this of less than 85% is justified in detail; section to permit progressive flooding and to the spaces with which they connect.

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(h) Buoyancy of superstructure. For [CGD 79–023, 48 FR 51040, Nov. 4, 1983, as the purpose of paragraph (b) of this sec- amended by USCG–2000–7641, 66 FR 55574, tion, the buoyancy of any super- Nov. 2, 2001] structure directly above the side damage is to be disregarded. The unflooded § 172.070 Intact stability. parts of superstructures beyond the ex- All tank vessels of 5,000 deadweight tent of damage may be taken into con- tons (DWT) and above, contracted after sideration if they are separated from December 3, 2001, must comply with the damaged space by watertight bulk- the intact stability requirements of heads and no progressive flooding of IMO Res. MEPC.117(52) (incorporated these intact spaces takes place. by reference, see § 172.020). [USCG–2007–0030, 75 FR 78086, Dec. 14, 2010] TABLE 172.065(a)—EXTENT OF DAMAGE COLLISION PENETRATION

Longitudinal extent ...... 0.495L2/3 or 47.6 feet ((1⁄3)L2/3 or Subpart E—Special Rules Per- 14.5m) whichever is shorter. taining to a Barge That Carries Transverse extent 1 ...... B/5 or 37.74 feet (11.5m) which is shorter. a Hazardous Liquid Regulated Vertical extent ...... From the baseline upward with- Under Subchapter O of This out limit. Chapter GROUNDING PENETRATION AT THE FORWARD END BUT EXCLUD- ING ANY DAMAGE AFT OF A POINT 0.3L AFT OF THE FORWARD PERPENDICULAR § 172.080 Specific applicability.

Longitudinal extent ...... 0.495L 2/3 or 47.6 feet ((1⁄3)L2/3 or This subpart applies to each tank 14.5m) whichever is shorter. barge that carries a cargo listed in Transverse extent ...... B/6 or 32.81 feet (10m) which- Table 151.05 of this chapter. ever is shorter but not less than 16.41 feet (5m). [CGD 79–023, 48 FR 51040, Nov. 4, 1983, as Vertical extent from the B/15 or 19.7 feet (6m) whichever amended by USCG–2009–0702, 74 FR 49239, baseline. is shorter. Sept. 25, 2009] GROUNDING PENETRATION AT ANY OTHER LONGITUDINAL POSITION § 172.085 Hull type. Longitudinal extent ...... L/10 or 16.41 feet (5m) whichever is shorter. If a cargo listed in Table 151.05 of Transverse extent ...... 16.41 feet (5m). part 151 of this chapter is to be carried, Vertical extent from the B/15 or 19.7 feet (6m) whichever the tank barge must be at least the baseline. is shorter. hull type specified in Table 151.05 of GROUNDING PENETRATION FOR RAKING DAMAGE this chapter for that cargo. For tank vessels of 20,000 DWT and above, the following as- § 172.087 Cargo loading assumptions. sumed bottom raking (a) The calculations required in this damage must supple- ment the damage as- subpart must be done for cargo weights sumptions:. and densities up to and including the Longitudinal extent ...... For vessels of 75,000 DWT and maximum that is to be endorsed on the above, 0.6L measured from the forward perpendicular. Certificate of Inspection in accordance ...... For vessels of less than 75,000 with § 151.04–1(c) of this chapter. DWT, 0.4L measured from the (b) For each condition of loading and forward perpendicular. Transverse extent ...... B/3 anywhere in the bottom. operation, each cargo tank must be as- Vertical extent ...... Breach of the outer hull. sumed to have its maximum free sur- 1 Damage applied inboard from the vessel’s side at right an- face. gles to the centerline at the level of the summer load line assigned under Subchapter E of this chapter. § 172.090 Intact transverse stability. TABLE 172.065(b)—PERMEABILITY (a) Except as provided in paragraph Permeability (b) of this section, each tank barge Spaces and tanks (percent) must be shown by design calculations to have a righting arm curve with the Storeroom spaces ...... 60. Accommodation spaces ...... 95. following characteristics: Voids ...... 95. (1) If the tank barge is in river serv- Consumable liquid tanks ...... 95 or 0.1 ice, the area under the righting arm 2 Other liquid tanks ...... 95 or 0. curve must be at least 5 foot-degrees 1 Whichever results in the more disabling condition. 2 If tanks are partially filled, the permeability must be deter- (1.52 meter-degrees) up to the smallest mined from the actual density and amount of liquid carried. of the following angles:

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(i) The angle of maximum righting (d) For the purpose of this section, arm. downflooding angle means the static (ii) The downflooding angle. angle from the intersection of the ves- (2) If the tank barge is in lakes, bays sel’s centerline and waterline in calm and sounds or Great Lakes summer water to the first opening that does not service, the area under the righting close watertight automatically. arm curve must be at least 10 foot-degrees (3.05 meter-degrees) up to the § 172.095 Intact longitudinal stability. smallest of the following angles: Each tank barge must be shown by (i) The angle of maximum righting design calculations to have a longitu- arm. dinal metacentric height (GM) in feet (ii) The downflooding angle. (meters) in each condition of loading (3) If the tank barge is in ocean or and operation, at least equal to the fol- Great Lakes winter service, the area lowing: under the righting arm curve must be at least 15 foot-degrees (4.57 meter-de- 0.02(L)2 grees) up to the smallest of the fol- GM = lowing angles: d (i) The angle of maximum righting where— arm. L=LOA in feet (meters) (ii) The downflooding angle. d=draft in feet (meters). (b) If the vertical center of gravity of the cargo is below the weather deck at § 172.100 Watertight integrity. the side of the tank barge amidships, it (a) Except as provided in paragraph must be shown by design calculations (b) of this section, each Type I or II that the barge has at least the fol- hopper barge hull must have a weather- lowing metacentric height (GM) in feet tight weather deck. (meters) in each condition of loading and operation: (b) If a Type I or II barge hull has an open hopper, the fully loaded barge (K)(B) must be shown by design calculations GM = to have at least 2 inches (50 mm) of fe positive GM when the hopper space is where— flooded to the height of the weather K=0.3 for river service. deck. K=0.4 for lakes, bays and sounds and Great (c) When doing the calculations re- Lakes summer service. quired by this section, credit may be K=0.5 for ocean and Great Lakes winter serv- given for the buoyancy of the im- ice. mersed portion of cargo tanks if the B=beam in feet (meters). tank securing devices are shown by de- fe=effective freeboard in feet (meters). sign calculations to be strong enough (c) The effective freeboard is given to hold the tanks in place when they by— are subjected to the buoyant forces resulting from the water in the hopper. fe=f + fa ; or fe=d, whichever is less. § 172.103 Damage stability. where— Each tank barge must be shown by f=the freeboard to the deck edge amidships design calculations to meet the sur- in feet (meters). vival conditions in § 172.110 assuming fa=(1.25)(a/L)((2b/B)–1)(h); or the damage specified in § 172.104 to the fa=h, whichever is less. hull type specified in Table 151.05 of where— part 151 of this chapter. a=trunk length in feet (meters). L=LOA in feet (meters) § 172.104 Character of damage. b=breadth of a watertight trunk in feet (me- (a) Type I barge hull not in an inte- ters). B=beam of the barge in feet (meters). grated tow. If a Type I hull is required h=height of a watertight trunk in feet (me- and the barge is not a box barge de- ters). signed for use in an integrated tow, de- d=draft of the barge in feet (meters). sign calculations must show that the

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barge can survive damage at any loca- as provided in paragraph (d) of this section including the intersection of a tion. transverse and a longitudinal bulk- (d) A hopper barge must not heel be- head. yond the angle at which the deck edge (b) Type I barge hull in an integrated is first submerged by more than ‘‘fa’’ tow. If a Type I barge hull is required as defined in § 172.090(c). and the barge is a box barge designed (e) Except as provided in paragraphs for operation in an integrated tow, de- (h) and (i) of this section, each tank sign calculations must show that the barge must not heel beyond the angle barge can survive damage— at which— (1) At any location on the bottom of (1) The deck edge is first submerged; the tank barge except on a transverse or watertight bulkhead; and (2) If the barge has one or more wa- (2) At any location on the side of the tertight trunks, the deck edge is first tank barge including on a transverse submerged by more than ‘‘fa’’ as de- watertight bulkhead. fined in § 172.090(c). (c) Type II barge hull. If a Type II hull (f) Except as provided in paragraphs is required, design calculations must (h) and (i) of this section, a tank barge show that a barge can survive damage must not trim beyond the angle at at any location except on a transverse which— watertight bulkhead. (1) The deck edge is first submerged; § 172.105 Extent of damage. or (2) If the barge has one or more wa- For the purpose of § 172.103, design tertight trunks, the intersection of the calculations must include both side deck and the trunk is first submerged. and bottom damage, applied separately. Damage must consist of the (g) If a tank barge experiences simul- most disabling penetration up to and taneous heel and trim, the trim re- including penetrations having the fol- quirements in paragraph (f) of this sec- lowing dimensions: tion apply only at the centerline. (a) Side damage must be assumed to (h) Except as provided in paragraph be as follows: (i) of this section, in no case may any (1) Longitudinal extent—6 feet (183 part of the actual cargo tank top be centimeters). underwater in the final condition of (2) Transverse extent—30 inches (76 equilibrium. centimeters). (i) If a barge has a ‘‘step-down’’ in (3) Vertical extent—from the baseline hull depth on either or both ends and upward without limit. all cargo tank openings are located on (b) Bottom damage must be assumed the higher deck level, the deck edge to be 15 inches (38 centimeters) from and tank top in the stepped-down area the baseline upward. may be submerged. § 172.110 Survival conditions. Subpart F—Special Rules Per- (a) Paragraphs (c) and (d) of this sec- taining to a Ship That Carries tion apply to a hopper barge and para- a Hazardous Liquid Regulated graphs (e) through (i) apply to all other Under Subchapter O of This tank barges. Chapter (b) A barge is presumed to survive assumed damage if it meets the following § 172.125 Specific applicability. conditions in the final stage of flooding: This subpart applies to each tankship (c) A hopper barge must not heel or that carries a cargo listed in Table I of trim beyond the angle at which— part 153 of this chapter, except that it (1) The deck edge is first submerged; does not apply to a tankship whose or cargo tanks are clean and gas free. (2) If the barge has a coaming that is at least 36 inches (91.5 centimeters) in § 172.127 Definitions. height, the intersection of the deck and Length or L means load line length the coaming is first submerged, except (LLL).

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§ 172.130 Calculations. (a) Design calculations must include (a) Except as provided in § 153.7 of both side and bottom damage, applied this chapter, each tankship must be separately; and shown by design calculations to meet (b) Damage must consist of the pene- the survival conditions in § 172.150 in trations having the dimensions given each condition of loading and operation in Table 172.135 except that, if the most assuming the damage specified in disabling penetrations would be less § 172.133 for the hull type prescribed in than the penetrations given in Table part 153 of this chapter. 172.135, the smaller penetration must (b) If a cargo listed in Table I of part be assumed. 153 of this chapter is to be carried, the TABLE 172.135—EXTENT OF DAMAGE vessel must be at least the hull type COLLISION PENETRATION specified in part 153 of this chapter for Longitudinal extent ...... 0.495L 2⁄3 or 47.6 feet ((1⁄3)L 2⁄3 or that cargo. 14.5m) whichever is shorter. Transverse extent 1 ...... B/5 or 37.74 feet (11.5m) 2 which- [CGD 79–023, 48 FR 51040, Nov. 4, 1983, as ever is shorter. amended by CGD 81–101, 52 FR 7799, Mar. 12, Vertical extent ...... From the baseline upward with- 1987] out limit. GROUNDING PENETRATION AT THE FORWARD END BUT EXCLUD- § 172.133 Character of damage. ING ANY DAMAGE AFT OF A POINT 0.3L AFT OF THE FORWARD PERPENDICULAR (a) If a type I hull is required, design calculations must show that the vessel Longitudinal extent ...... L/10. can survive damage at any location. Transverse extent ...... B/6 or 32.81 feet (10m) whichever is shorter. (b) Except as provided in § 153.7 of Vertical extent from the B/15 or 19.7 feet (6m) whichever this chapter, if a type II hull is re- baseline upward. is shorter. quired, design calculations must show GROUNDING PENETRATION AT ANY OTHER LONGITUDINAL that a vessel— POSITION (1) Longer than 492 feet (150 meters) Longitudinal extent ...... L/10 or 16.41 feet (5m) which- in length can survive damage at any lo- ever is shorter. cation; and Transverse extent ...... 16.41 feet (5m). Vertical extent from the B/15 or 19.7 feet (6m) whichever (2) Except as specified in paragraph baseline upward. is shorter. (d) of this section, 492 feet (150 meters) 1 Damage applied inboard from the vessel’s side at right an- or less in length can survive damage at gles to the centerline at the level of the summer load line assigned under Subchapter E of this chapter. any location. 2 B is measured amidships. (c) If a Type III hull is required, design calculations must show that a ves- § 172.140 Permeability of spaces. sel— (a) When doing the calculations re- (1) Except as specified in paragraph quired in § 172.130, the permeability of a (d) of this section, 410 feet (125 meters) floodable space other than a machinery in length or longer can survive damage space must be as listed in Table at any location; and 172.060(b). (2) Less than 410 feet (125 meters) in (b) Calculations in which a machin- length can survive damage at any loca- ery space is treated as a floodable tion except to an aft machinery space. space must be based on an assumed ma- (d) A vessel described in paragraph chinery space permeability of 0.85, un- (b)(2) or (c)(1) of this section need not less the use of an assumed permeability be designed to survive damage to a of less than 0.85 is justified in detail. main transverse watertight bulkhead (c) If a cargo tank would be pene- bounding an aft machinery space. Ex- trated under the assumed damage, the cept as provided in § 153.7 of this chap- cargo tank must be assumed to lose all ter, the machinery space must be cal- cargo and refill with salt water up to culated as a single floodable compart- the level of the tankship’s final equi- ment. librium waterline. [CGD 79–023, 48 FR 51040, Nov. 4, 1983, as amended by CGD 81–101, 52 FR 7799, Mar. 12, § 172.150 Survival conditions. 1987] A tankship is presumed to survive assumed damage if it meets the following § 172.135 Extent of damage. conditions in the final stage of flood- For the purpose of § 172.133— ing:

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(a) Final waterline. The final water- heads and no progressive flooding of line, in the final condition of sinkage, these intact spaces takes place. heel, and trim, must be below the lower (f) Metacentric height. After flooding, edge of openings such as air pipes and the tankship’s metacentric height openings closed by weathertight doors must be at least 2 inches (50mm) when or hatch covers. The following types of the ship is in the upright position. openings may be submerged when the (g) Equalization arrangements. Flood- tankship is at the final waterline: ing equalization arrangements requir- (1) Openings covered by watertight ing mechanical operation such as manhole covers or watertight flush valves or cross-flooding lines may not scuttles. be assumed to reduce the angle of heel. (2) Small watertight cargo tank Spaces joined by ducts of large cross hatch covers. sectional area are treated as common (3) A Class 1 door in a watertight spaces. bulkhead within the superstructure. (h) Intermediate stages of flooding. If (4) Remotely operated sliding water- an intermediate stage of flooding is tight doors. more critical than the final stage, the (5) Side scuttles of the non-opening tankship must be shown by design cal- type. culations to meet the requirements in (b) Heel angle. (1) Except as described in paragraph (b)(2) of this section, the this section in the intermediate stage. maximum angle of heel must not ex- [CGD 79–023, 48 FR 51040, Nov. 4, 1983, as ceed 15 degrees (17 degrees if no part of amended by CGD 88–070, 53 FR 34537, Sept. 7, the freeboard deck is immersed). 1988] (2) The Commanding Officer, Marine Safety Center will consider on a case Subpart G—Special Rules Per- by case basis each vessel 492 feet (150 taining to a Ship That Carries meters) or less in length having a final a Bulk Liquefied Gas Regu- heel angle greater than 17 degrees but less than 25 degrees. lated Under Subchapter O of (c) Range of stability. Through an This Chapter angle of 20 degrees beyond its position of equilibrium after flooding, a tank- § 172.155 Specific applicability. ship must meet the following condi- This subpart applies to each tankship tions: that has on board a bulk liquefied gas (1) The righting arm curve must be listed in Table 4 of part 154 of this positive. chapter as cargo, cargo residue, or (2) The maximum righting arm must vapor. be at least 3.95 inches (10 cm). (3) Each submerged opening must be § 172.160 Definitions. weathertight. As used in this subpart— (d) Progressive flooding. Pipes, ducts (a) Length or L means the load line or tunnels within the assumed extent length (LLL). of damage must be either— (b) MARVS means the Maximum Al- (1) Equipped with arrangements such lowable Relief Valve Setting of a cargo as stop check valves to prevent pro- tank. gressive flooding to other spaces with which they connect; or § 172.165 Intact stability calculations. (2) Assumed in the design calculations required by § 172.130 to flood the (a) Design calculations must show spaces with which they connect. that 2 inches (50mm) of positive (e) Buoyancy of superstructure. The metacentric height can be maintained buoyancy of any superstructure di- by each tankship when it is being load- rectly above the side damage is to be ed and unloaded. disregarded. The unflooded parts of su- (b) For the purpose of demonstrating perstructures beyond the extent of compliance with the requirements of damage may be taken into consider- paragraph (a) of this section, the ef- ation if they are separated from the fects of the addition of water ballast damaged space by watertight bulk- may be considered.

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§ 172.170 Damage stability calcula- (f) If a main transverse watertight tions. bulkhead or transverse watertight (a) Each tankship must be shown by bulkhead bounding a side tank or dou- design calculations to meet the sur- ble bottom tank has a step or a recess vival conditions in § 172.195 in each con- that is longer than 10 feet (3.05 meters) dition of loading and operation assum- located within the extent of penetra- ing the damage specified in § 172.175 for tion of assumed damage, the vessel the hull type specified in Table 4 of must be shown by design calculations part 154 of this chapter. to survive damage to this bulkhead. (b) If a cargo listed in Table 4 of part The step formed by the after peak 154 of this chapter is to be carried, the bulkhead and after peak tank top is vessel must be at least the ship type not a step for the purpose of this regu- specified in Table 4 of part 154 of this lation. chapter for the cargo. § 172.180 Extent of damage. § 172.175 Character of damage. For the purpose of § 172.170— (a) If a type IG hull is required, de- (a) Design calculations must include sign calculations must show that the both side and bottom damage, applied vessel can survive damage at any loca- separately; and tion. (b) Damage must consist of the pene- (b) If a type IIG hull is required, de- trations having the dimensions given sign calculations must show that a ves- in Table 172.180 except that, if the most sel— disabling penetrations would be less (1) Longer than 492 feet (150 meters) than the penetrations given in Table in length can survive damage at any lo- 172.180, the smaller penetration must cation; and be assumed. (2) 492 feet (150 meters) or less in length can survive damage at any loca- TABLE 172.180—EXTENT OF DAMAGE tion except the transverse bulkheads COLLISION PENETRATION bounding an aft machinery space. The Longitudinal extent ...... 0.495L2/3 or 47.6 feet ((1/3)L2/3 or machinery space is calculated as a sin- 14.5m) whichever is shorter. gle floodable compartment. Transverse extent 1 ...... B/5 or 37.74 feet (11.5m) 2 whichever is shorter. (c) If a vessel has independent tanks Vertical extent ...... From the baseline upward with- type C with a MARVS of 100 psi (689 out limit. kPa) gauge or greater, is 492 feet (150 GROUNDING PENETRATION AT THE FORWARD END BUT EXCLUD- meters) or less in length, and Table 4 of ING ANY DAMAGE AFT OF A POINT 0.3L AFT OF THE FORWARD part 154 of this chapter allows a type PERPENDICULAR IIPG hull, design calculations must Longitudinal extent ...... 0.495L2/3 or 47.6 feet ((1/3)L2/3 or show that the vessel can survive dam- 14.5m) whichever is shorter. age at any location, except as pre- Transverse extent ...... B/6 or 32.81 feet (10m) which- scribed in paragraph (e) of this section. ever is shorter. Vertical extent from the B/15 or 6.6 feet (2m) whichever (d) If a type IIIG hull is required, ex- molded line of the shell is shorter. cept as specified in paragraph (e) of at the centerline. this section, design calculations must GROUNDING PENETRATION AT ANY OTHER LONGITUDINAL show that a vessel— POSITION (1) 410 feet (125 meters) in length or Longitudinal extent ...... L/10 or 16.41 feet (5m) which- longer can survive damage at any loca- ever is shorter. tion; and Transverse extent ...... B/6 or 16.41 feet (5m) whichever is shorter. (2) Less than 410 feet (125 meters) in Vertical extent from the B/15 or 6.6 feet (2m) whichever length can survive damage at any loca- molded line of the shell is shorter. tion, except in the main machinery at the centerline. space. 1 Damage applied inboard from the vessel’s side at right angles to the centerline at the level of the summer load line as- (e) The calculations in paragraphs (c) signed under Subchapter E of this chapter. and (d) of this section need not assume 2 B is measured amidships. damage to a transverse bulkhead unless it is spaced closer than the longi- § 172.185 Permeability of spaces. tudinal extent of collision penetration (a) When doing the calculations re- specified in Table 172.180 from another quired in § 172.170, the permeability of a transverse bulkhead. floodable space other than a machinery

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space must be as listed in Table to be flooded in the damaged stability 172.060(b). calculations. (b) Calculations in which a machin- (e) Buoyancy of superstructure. The ery space is treated as a floodable buoyancy of any superstructure di- space must be based on an assumed ma- rectly above the side damage is to be chinery space permeability of 85%, un- disregarded. The unflooded parts of su- less the use of an assumed permeability perstructures beyond the extent of of less than 85% is justified in detail. damage may be taken into consider- (c) If a cargo tank would be pene- ation if they are separated from the trated under the assumed damage, the damaged space by watertight bulk- cargo tank must be assumed to lose all heads and no progressive flooding of cargo and refill with salt water up to these intact spaces takes place. the level of the tankship’s final equi- (f) Metacentric height. After flooding, librium waterline. the tank ship’s metacentric height § 172.195 Survival conditions. must be at least 2 inches (50 mm) when the vessel is in the upright position. A vessel is presumed to survive as- (g) Equalization arrangements. Equali- sumed damage if it meets the following zation arrangements requiring mechan- conditions in the final stage of flood- ical aids such as valves or cross-flooding: ing lines may not be considered for re- (a) The final water- Final waterline. ducing the angle of heel. Spaces joined line, in the final condition of sinkage, by ducts of large cross-sectional area heel, and trim, must be below the lower are treated as common spaces. edge of an opening through which progressive flooding may take place, such (h) Intermediate stages of flooding. If as an air pipe, or an opening that is an intermediate stage of flooding is closed by means of a weathertight door more critical than the final stage, the or hatch cover. This opening does not tank vessel must be shown by design include an opening closed by a— calculations to meet the requirements (1) Watertight manhole cover; in this section in the intermediate (2) Flush scuttle; stage. (3) Small watertight cargo tank § 172.205 Local damage. hatch cover that maintains the high integrity of the deck; (a) Each tankship must be shown by (4) A Class 1 door in a watertight design calculations to meet the sur- bulkhead within the superstructure; vival conditions in paragraph (b) of (5) Remotely operated sliding water- this section in each condition of load- tight door; or ing and operation assuming that local (6) A side scuttle of the non-opening damage extending 30 inches (76 cm) type. normal to the hull shell is applied at (b) Heel angle. The maximum angle of any location in the cargo length: heel must not exceed 30 degrees. (b) The vessel is presumed to survive (c) Range of stability. Through an assumed local damage if it does not angle of 20 degrees beyond its position heel beyond the smaller of the fol- of equilibrium after flooding, a tank- lowing angles in the final stage of ship must meet the following condi- flooding: tions: (1) 30 degrees. (1) The righting arm curve must be (2) The angle at which restoration of positive. propulsion and steering, and use of the (2) The maximum righting arm must ballast system is precluded. be at least 3.94 inches (10 cm). (3) Each submerged opening must be weathertight. Subpart H—Special Rules Per- (d) Progressive flooding. If pipes, taining to Great Lakes Dry ducts, or tunnels are within the as- Bulk Cargo Vessels sumed extent of damage, arrangements must be made to prevent progressive SOURCE: CGD 80–159, 51 FR 33059, Sept. 18, flooding to a space that is not assumed 1986, unless otherwise noted.

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§ 172.215 Specific applicability. watertight bulkheads and no progres- This subpart applies to each new sive flooding of these intact spaces Great Lakes vessel of 1600 gross tons or takes place. more carrying dry cargo in bulk. § 172.230 Character of damage. § 172.220 Definitions. (a) Design calculations must show (a) As used in this subpart Length (L), that each vessel can survive damage— (1) To any location between adjacent Breadth (B), and Molded Depth (D) are main transverse watertight bulkheads; as defined in § 45.3 of this chapter. (2) To any location between a main (b) As used in this part new Great transverse bulkhead and a partial Lakes Vessel means a vessel operating transverse bulkhead in way of a side solely within the limits of the Great wing tank; Lakes as defined in this subchapter (3) To a main or wing tank transverse that: watertight bulkhead spaced closer than (1) Was contracted for on or after No- the longitudinal extent of collision vember 17, 1986, or delivered on or after penetration specified in Table 172.235 to November 17, 1988. (2) Has undergone a major conversion another main transverse watertight under a contract made on or after No- bulkhead; and (4) To a main transverse watertight vember 17, 1986, or completed a major bulkhead or a transverse watertight conversion on or after November 17, bulkhead bounding a side tank or dou- 1987. ble bottom tank if there is a step or a [CGD 80–159, 51 FR 33059, Sept. 18, 1986] recess in the transverse bulkhead that is longer than 10 feet (3.05 meters) and § 172.225 Calculations. that is located within the extent of (a) Each vessel must be shown by de- penetration of assumed damage. The sign calculations to meet the survival step formed by the after peak bulkhead conditions in § 172.245 in each condition and after peak tank top is not a step of loading and operation, assuming the for the purpose of this paragraph. damage specified in § 172.230. (b) When doing the calculations re- § 172.235 Extent of damage. quired by paragraph (a) of this section, For the purpose of the calculations the virtual increase in the vertical cen- required in § 172.225— ter of gravity due to a liquid in a space (a) Design calculations must include must be determined by calculating ei- both side and bottom damage, applied ther— separately; and (1) The free surface effect of the liq- (b) Damage must consist of the pene- uid with the vessel assumed heeled five trations having the dimensions given degrees from the vertical; or in Table 172.235 except that, if the most (2) The shift of the center of gravity disabling penetrations would be less of the liquid by the moment of trans- than the penetrations described in this ference method. paragraph, the smaller penetration (c) In calculating the free surface ef- must be assumed. fect of consumable liquids, it must be assumed that, for each type of liquid, TABLE 172.235—EXTENT OF DAMAGE at least one transverse pair of wing tanks or a single centerline tank has a Collision Penetration free surface. The tank or combination Longitudinal extent ...... 0.495 L2/3 or 47.6 feet. of tanks selected must be those having (1/3 L2/3 or 14.5 m), whichever is the greatest free surface effect. less. (d) When doing the calculations re- Transverse extent ...... 4 feet 2 inches (1.25 m).1 Vertical extent ...... From the baseline upward without quired by paragraph (a) of this section, limit. the buoyancy of any superstructure directly above the side damage must not Grounding Penetration Forward of a Point 0.3L Aft of the be considered. The unflooded parts of Forward Perpendicular superstructures beyond the extent of Longitudinal ...... 0.495 L2/3 or 47.6 feet. damage may be considered if they are (1/3 L2/3 or 14.5 m), whichever is separated from the damaged space by less.

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TABLE 172.235—EXTENT OF DAMAGE— conditions in the final stage of flood- Continued ing: (a) Final waterline. The final water- Transverse ...... B/6 or 32.8 feet (10 m), whichever line, in the final condition of sinkage, is less, but not less than 16.4 feet (5 m).1 heel, and trim must be below the lower Vertical extent ...... 0.75 m from the baseline. edge of an opening through which progressive flooding may take place, such Grounding Penetration at Any Other Longitudinal Position as an air pipe, or an opening that is closed by means of a weathertight door Longitudinal extent ...... L/10 or 16.4 feet (5 m), whichever is less. or hatch cover. This opening does not Transverse ...... 4 feet 2 inches (1.25 m). include an opening closed by a: Vertical extent ...... 2 feet 6 inches (0.75 m) from the (1) Watertight manhole cover; baseline. (2) Flush scuttle; 1 Damage applied inboard from the vessel’s side at right an- (3) Small watertight cargo tank gles to the centerline at the level of the summer load line assigned under Subchapter E of this chapter. hatch cover that maintains the high integrity of the deck; § 172.240 Permeability of spaces. (4) Class 1 door in a watertight bulk- When doing the calculations required head; in § 172.225, (5) Remotely operated sliding water- (a) The permeability of a floodable tight door; space, other than a machinery or cargo (6) Side scuttle of the nonopening space, must be assumed as listed in type; Table 172.240; (7) Retractable inflatable seal; or (b) Calculations in which a machin- (8) Guillotine door. ery space is treated as a floodable (b) Heel angle. The maximum angle of space must be based on an assumed ma- heel must not exceed 15 degrees, except chinery space permeability of 85% un- that this angle may be increased to 17 less the use of an assumed permeability degrees if no deck edge immersion oc- of less than 85% is justified in detail; curs. and (c) Range of stability. Through an (c) Calculations in which a cargo angle of 20 degrees beyond its position space that is completely filled is con- of equilibrium after flooding, a vessel sidered flooded must be based on an as- must meet the following conditions: sumed cargo space permeability of 60% (1) The righting arm curve must be unless the use of an assumed perme- positive. ability of less than 60% is justified in (2) The maximum righting arm must detail. If the cargo space is not com- be at least 4 inches (10 cm). pletely filled, a cargo space perme- (3) Each submerged opening must be ability of 95% must be assumed unless weathertight the use of an assumed permeability of (d) Metacentric height. After flooding, less than 95% is justified in detail. the metacentric height must be at TABLE 172.240—PERMEABILITY least 2 inches (50 mm) when the vessel is in the equilibrium position. Spaces and tanks Permeability (per- (e) Progressive flooding. In the design cent) calculations required by § 172.225, pro- Storeroom spaces ...... 60 gressive flooding between spaces con- Accommodations spaces ...... 95 nected by pipes, ducts or tunnels must Voids ...... 95 Consumable liquid tanks ...... 1 95 or 0 be assumed unless: Other liquid tanks ...... 2 95 or 0 (1) Pipes within the assumed extent Cargo (completely filled) ...... 60 of damage are equipped with arrange- Cargo (empty) ...... 95 Machinery ...... 85 ments such as stop check valves to prevent progressive flooding to other 1 Whichever results in the more disabling condition. 2 If tanks are partially filled, the permeability must be deter- spaces with which they connect; and, mined from the actual density and amount of liquid carried. (2) Progressive flooding through ducts or tunnels is protected against § 172.245 Survival conditions. by: A vessel is presumed to survive as- (i) Retractable inflatable seals to sumed damage if it meets the following cargo hopper gates; or

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(ii) Guillotine doors in bulkheads in Comp., p. 277; Department of Homeland Secu- way of the conveyor belt. rity Delegation No. 0170.1. SOURCE: CGD 79–023, 48 FR 51045, Nov. 4, PART 173—SPECIAL RULES 1983, unless otherwise noted. PERTAINING TO VESSEL USE Subpart A—General Subpart A—General § 173.001 Applicability. Sec. 173.001 Applicability. Each vessel that is engaged in one of the following activities must comply Subpart B—Lifting with the applicable provisions of this 173.005 Specific applicability. part: 173.007 Location of the hook load. (a) Lifting. 173.010 Definitions. (b) Training (schoolship). 173.020 Intact stability standards: (c) Oceanographic research. Counterballasted and non- (d) Towing. counterballasted vessels. 173.025 Additional intact stability standards: Counterballasted vessels. Subpart B—Lifting

Subpart C—School Ships § 173.005 Specific applicability. 173.050 Specific applicability. This subpart applies to each vessel 173.051 Public nautical school ships. that— 173.052 Civilian nautical school ships. (a) Is equipped to lift cargo or other 173.053 Sailing school vessels. objects; and 173.054 Watertight subdivision and damage stability standards for new sailing school (b) Has a maximum heeling moment vessels. due to hook load greater than or equal 173.055 Watertight subdivision and damage to— stability standards for existing sailing school vessels. (0.67)(W)(GM)(F/B) in meter-metric tons 173.056 Collision and other watertight bulk- (foot-long tons), where— heads. W=displacement of the vessel with the hook 173.057 Permitted locations for Class I wa- load included in metric (long) tons. tertight doors. GM=metacentric height with hook load in- 173.058 Double bottom requirements. cluded in meters (feet). 173.059 Penetrations and openings in water- F=freeboard to the deck edge amidships in tight bulkheads. meters (feet). 173.060 Openings in the side of a vessel B=beam in meters (feet). below the bulkhead or weather deck. 173.061 Watertight integrity above the mar- [CGD 79–023, 48 FR 51045, Nov. 4, 1983, as gin line. amended by CGD 85–080, 61 FR 945, Jan. 10, 173.062 Drainage of weather deck. 1996] 173.063 Intact stability requirements. § 173.007 Location of the hook load. Subpart D—Oceanographic Research When doing the calculations required 173.070 Specific applicability. in this subpart, the hook load must be 173.075 Subdivision requirements. considered to be located at the head of 173.080 Damage stability requirements. the crane. 173.085 General subdivision requirements. § 173.010 Definitions. Subpart E—Towing As used in this part— 173.090 General. (a) Hook load means the weight of the 173.095 Towline pull criterion. object lifted by the crane. AUTHORITY: 43 U.S.C. 1333; 46 U.S.C. 2113, (b) Crane radius means the distance 3306, 5115; E.O. 12234, 45 FR 58801, 3 CFR, 1980 illustrated in Figure 173.010.

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of this section, the vessel owner may demonstrate in the presence of the OCMI that the vessel will not heel beyond the limits specified in paragraph (d) of this section: (1) Beam to depth—3.40 to 4.75. (2) Length to beam—3.20 to 4.50. (3) Draft to depth—0.60 to 0.85. (d) For the purpose of paragraph (c) of this section, the following limits of heel apply with the vessel at its deepest operating draft: (1) Protected and partially protected waters and Great Lakes in summer— heel to main deck immersion or bilge emergence, whichever occurs first. (2) Exposed waters and Great Lakes in winter—heel permitted to one-half of the freeboard or one-half of the draft, whichever occurs first. [CGD 79–023, 48 FR 51045, Nov. 4, 1983, as § 173.020 Intact stability standards: amended by CGD 85–080, 61 FR 945, Jan. 10, Counterballasted and non- 1996] counterballasted vessels. § 173.025 Additional intact stability (a) Except as provided in paragraph standards: Counterballasted ves- (c) of this section, each vessel that is sels. not equipped to counter-ballast while lifting must be shown by design cal- (a) Each vessel equipped to counter- culations to comply with this section ballast while lifting must be shown by in each condition of loading and oper- design calculations to be able to with- ation and at each combination of hook stand the sudden loss of the hook load, load and crane radius. in each condition of loading and oper- (b) Each vessel must have a righting ation and at each combination of hook arm curve with the following charac- load and crane radius. teristics: (b) When doing the calculations re- (1) If the vessel operates in protected quired by this section, the hook load or partially protected waters, the area and counterballast heeling arms and under the righting arm curve up to the vessel righting arms, as plotted on smallest of the following angles must graph 173.025, must define areas that be at least 10 foot-degrees (3.05 meter- satisfy the following equation: degrees): (i) The angle corresponding to the Area II > Area I + K maximum righting arm. Where— (ii) The downflooding angle. (1) K=O for operation on protected waters (iii) 40 degrees. and 7 foot-degrees (2.13 meter-degrees) (2) If the vessel operates in exposed for operation on partially protected and waters, the area under the righting exposed waters. arm curve up to the smallest of the fol- (2) Areas I and II are shown on graph 173.025. lowing angles must be at least 15 foot- degrees (4.57 meter-degrees): (c) Each heeling arm curve must be (i) The angle corresponding to the defined by— maximum righting arm. HA=HAO cos (T) (ii) The downflooding angle. (iii) 40 degrees. Where— (c) If the vessel’s hull proportions fall HA=heeling arm. within all three of the following limits, HAO=heeling arm at 0 degrees of heel. in lieu of complying with paragraph (b) T=angle of heel.

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Where— Subpart C—School Ships GZ(1) is the righting arm curve at the displacement corresponding to the vessel § 173.050 Specific applicability. without hooking load. Each nautical school ship, inspected GZ(2) is the righting arm curve at the displacement corresponding to the vessel under Subchapter R of this chapter, with hook load. must comply with this subpart. HA(1) is the heeling arm curve due to the combined heeling moments of the hook § 173.051 Public nautical school ships. load and the counterballast at the dis- Each public nautical school ship placement with hook load. must comply with— HA(2) is the heeling arm due to the counter- (a) Section 171.070(a) of this sub- ballast at the displacement without hook load. chapter as a passenger vessel carrying Theta(c) is the angle of static equilibrium 400 or less passengers; due to the combined hook load and (b) Section 171.070(e) of this sub- counterballast heeling moments. chapter; Theta(f) is the downflooding angle on the (c) Section 171.072 of this subchapter; counterballasted side of the vessel. and [CGD 79–023, 48 FR 51045, Nov. 4, 1983, as (d) Section 171.073 of this subchapter. amended by CGD 85–080, 61 FR 945, Jan. 10, [CGD 79–023, 48 FR 51045, Nov. 4, 1983. Redes- 1996] ignated by CGD 83–005, 51 FR 924, Jan. 9, 1986]

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§ 173.052 Civilian nautical school protected or partially protected waters ships. service only. Each civilian nautical school ship [CGD 83–005, 51 FR 924, Jan. 9, 1986, as amend- must comply with part 171 of this sub- ed by CGD 85–080, 61 FR 946, Jan. 10, 1996] chapter as though it were a passenger vessel. In addition to regular pas- § 173.055 Watertight subdivision and sengers, for the purpose of complying damage stability standards for ex- with part 171, the following will also isting sailing school vessels. count as passengers; (a) Except as provided in paragraph (a) A student. (c) of this section, an existing sailing (b) A cadet. school vessel which carries more than (c) An instructor who is not also a 49 persons must be fitted with a colli- member of the crew. sion bulkhead and any additional bulkheads necessary to provide one com- [CGD 79–023, 48 FR 51045, Nov. 4, 1983. Redes- partment subdivision. ignated by CGD 83–005, 51 FR 924, Jan. 9, 1986] (b) Except as provided in paragraph § 173.053 Sailing school vessels. (c) of this section, an existing sailing school vessel which has a mean length (a) In addition to the requirements in greater than 65 feet (19.8 meters), must §§ 173.054 through 173.063, each sailing be fitted with additional transverse wa- school vessel must comply with the tertight bulkheads necessary to pro- provisions of subpart A of part 171 of vide one compartment subdivision, this subchapter. when the following Subdivision Numer- (b) In addition to regular passengers, als are exceeded: for the purpose of complying with (1) For vessels to be operated on Ex- §§ 171.070 through 171.073 and § 171.080, posed Waters: the following will also be counted as passengers: L × N > 4000 (1) Sailing school students. (2) For vessels to be operated on Par- (2) Sailing school instructors. tially Protected Waters: (3) Guests. L × N > 4500 [CGD 83–005, 51 FR 924, Jan. 9, 1986] (3) For vessels to be operated on Pro- § 173.054 Watertight subdivision and tected Waters: damage stability standards for new L × N > 5000 sailing school vessels. (a) Each new sailing school vessel where L is the mean length and N is the which has a mean length greater than number of persons on board 75 feet (22.8 meters) or which carries (c) An existing sailing school vessel more than 30 persons must comply which is required to meet a one com- with— partment subdivision standard and has (1) Section 179.210(a) of this chapter; a mean length of 90 feet (27.4 meters) or (2) Sections 171.070 through 171.073; less may, instead of one compartment and subdivision, be fitted with a collision (3) Section 171.080 for Type II subdivi- bulkhead and sufficient air tankage or sion and damage stability. other internal buoyancy to maintain (b) Each new sailing school vessel the fully-loaded vessel afloat with posi- which has a mean length of 75 feet (22.8 tive stability in the flooded condition. meters) or less and carries more than (d) Except as provided in paragraph 30 persons must comply with either— (e) of this section, an existing sailing (1) Section 179.210(a) of this chapter school vessel which has a mean length and § 179.220 of this chapter; or greater than 65 feet (19.8 meters) must (2) Section 171.040(a)(1), §§ 171.070 be fitted with a collision bulkhead. through 171.073, and § 171.080. (e) On an existing sailing school ves- (c) Each new sailing school vessel sel, operating on protected waters, which does not carry more than 30 per- which has a mean length of 90 feet (27.4 sons must have a collision bulkhead meters) or less with no other require- unless it has a mean length less than 40 ment for subdivision, the collision feet (12.2 meters) and is certificated for bulkhead may be omitted.

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(f) An existing sailing school vessel, § 173.060 Openings in the side of a ves- operating on exposed waters, which has sel below the bulkhead or weather a mean length of 65 feet (19.8 meters) or deck. less and is carrying more than 15 per- (a) Openings in the side of a vessel sons, must be fitted with a collision below the bulkhead or weather deck bulkhead. must comply with the requirements in subpart F of part 171 of this subchapter [CGD 83–005, 51 FR 924, Jan. 9, 1986] or § 179.350 in subchapter T of this chap- § 173.056 Collision and other water- ter. tight bulkheads. (b) In addition to the requirements in paragraph (a) of this section, each sail- (a) Collision bulkheads required by ing school vessel which has a mean this section must comply with the re- length greater than 90 feet must com- quirements in § 171.085 of this sub- ply with the requirements in § 56.50–95 chapter. of Subchapter F of this chapter. (b) Each sailing school vessel required to meet paragraph (a) of § 173.054 [CGD 83–005, 51 FR 924, Jan. 9, 1986, as amended by CGD 85–080, 61 FR 945, Jan. 10, 1996] must comply with the machinery space bulkhead requirements in § 171.095 of § 173.061 Watertight integrity above this subchapter. the margin line. [CGD 83–005, 51 FR 924, Jan. 9, 1986] The watertight integrity of each sailing school vessel above the margin line § 173.057 Permitted locations for Class must comply with the requirements in I watertight doors. subpart G of part 171 of this subchapter (a) Class I doors are permitted in any or § 179.360 in subchapter T of this chap- location on a sailing school vessel ter. which has a mean length of 125 feet [CGD 83–005, 51 FR 925, Jan. 9, 1986, as amend- (38.1 meters) or less. ed by CGD 85–080, 61 FR 946, Jan. 10, 1996; 61 (b) Class I doors fitted in accordance FR 20556, May 7, 1996] with § 170.270 of this subchapter shall additionally be marked in two-inch let- § 173.062 Drainage of weather deck. ters ‘‘RECLOSE AFTER USE’’, and be The weather deck of each sailing provided with a remote position indi- school vessel must be provided with cator at the main navigating station of drainage in accordance with the re- the vessel. quirements in subpart H of part 171 of this subchapter or subpart D of part 178 [CGD 83–005, 51 FR 924, Jan. 9, 1986] in subchapter T of this chapter. § 173.058 Double bottom requirements. [CGD 83–005, 51 FR 925, Jan. 9, 1986, as amended by CGD 85–080, 61 FR 946, Jan. 10, 1996] Each new sailing school vessel which has a mean length greater than 165 feet § 173.063 Intact stability requirements. (50.3 meters) and is certificated for ex- (a) Except as provided in this section, posed water service must comply with each sailing school vessel must meet the double bottom requirements in the intact stability requirements in §§ 171.105 through 171.109, inclusive, of §§ 170.170, 171.050, and 171.055 of this this subchapter. chapter. [CGD 83–005, 51 FR 924, Jan. 9, 1986] (b) In applying the requirements in §§ 170.170 and 171.050 of this subchapter, § 173.059 Penetrations and openings in the value of ‘‘T’’ is equal to the angle watertight bulkheads. of heel at which the deck edge is immersed or 1⁄3 of the downflooding angle, Penetrations and openings in water- whichever is less. tight bulkheads must comply with the (c) In applying the requirements of requirements in subpart E of part 171 of § 171.055(d) (1) and (2) of this sub- this subchapter or §§ 179.320, 179.330, and chapter— 179.340 in subchapter T of this chapter. (1) The value ‘‘X’’ is equal to 0.6 long [CGD 83–005, 51 FR 924, Jan. 9, 1986, as amend- tons/square foot (9.8 metric tons/square ed by CGD 85–080, 61 FR 946, Jan. 10, 1996] meter).

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(2) For a vessel in service on pro- this chapter, may instead comply with tected or partially protected waters, the requirements in paragraph (e) of values ‘‘Y’’ and ‘‘Z’’ are determined this section. from graphs 173.063 (a) and (b) and mul- (e) In lieu of complying with the re- tiplied by the multiplier in graph quirements of paragraph (b) of this sec- 173.063(e). tion, an open boat may be provided (3) For a vessel in service on exposed with sufficient air tankage or other in- waters, ‘‘Y’’ and ‘‘Z’’ are determined ternal buoyancy to maintain the vessel from graphs 173.063 (c) and (d) and mul- afloat when the vessel is completely tiplied by the multiplier from graph flooded or capsized. If foam is used to 173.063(e). comply with this paragraph, it must be (4) To convert required numerals to installed in accordance with the re- units of ‘‘metric tons/square meter,’’ quirements in § 170.245 of this sub- multiply by 10.94. chapter. (d) Each vessel of the open boat type (f) A sailing school catamaran must that is required to comply with the re- meet the intact stability requirements quirements in §§ 178.300 and 178.310 of in § 171.057.

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[CGD 83–005, 51 FR 925, Jan. 9, 1986, as amended by CGD 85–080, 61 FR 946, Jan. 10, 1996]

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Subpart D—Oceanographic (k) Each port light in a space located Research below the freeboard deck, as defined in § 42.13–15(i) of this chapter, or in a § 173.070 Specific applicability. space within an enclosed super- Each oceanographic vessel, inspected structure must be fitted with a hinged under Subchapter U of this chapter, ex- inside dead cover. cept a barge that is less than 300 gross (l) Section 171.118 (b) and (c) of this tons, must comply with this subpart. subchapter. (m) Section 171.122 (a) through (d) § 173.075 Subdivision requirements. and (f) of this subchapter. (n) Section 171.135 of this subchapter. (a) Each oceanographic vessel must (o) A ventilation duct or forced draft comply with the subdivision require- duct may not penetrate a main trans- ments in §§ 171.070, 171.072, and 171.073 of verse watertight bulkhead unless— this subchapter as if it were a pas- (1) The penetration is watertight; senger vessel carrying 400 or less pas- (2) The penetration is located as near sengers. the vessel’s centerline as possible; and (b) Each vessel must have a collision (3) The bottom of the duct is not bulkhead. more than— § 173.080 Damage stability require- (i) 18 inches (45.7 cm) below the bulk- ments. head deck; and (ii) 4 feet (121.9 cm) above the final Each oceanographic vessel must com- waterline after damage determined in ply with § 171.080 of this subchapter as a § 173.080. category Z vessel.

§ 173.085 General subdivision require- Subpart E—Towing ments. Each oceanographic vessel must com- § 173.090 General. ply with the following: This subpart applies to each vessel (a) Section 171.085(c)(1), (d) and (g) of that is equipped for towing. this subchapter. (b) Section 171.105 (a) through (g) of § 173.095 Towline pull criterion. this subchapter except that a reduction (a) In each towing condition, each or elimination of the required inner vessel must be shown by design cal- bottom is allowed if— culations to meet the requirements of (1) The inner bottom would interfere either paragraph (b) or (c) of this sec- with the mission of the vessel; and tion. (2) As a result of other design fea- (b) The vessel’s metacentric height tures, the ability of the vessel to with- (GM) must be equal to or greater than stand side and bottom damage is not the following: reduced. (c) Section 171.106 of this subchapter. × 2 (N)(P D)3 (s)(h) (d) Section 171.108 of this subchapter. GM = (e) Section 171.109 of this subchapter. K(f/B)Δ (f) Section 171.111 of this subchapter. where— (g) Section 171.113 of this subchapter. N=number of propellers. (h) The collision bulkhead must not P=shaft power per shaft in horsepower (kilo- be penetrated by more than one pipe watts). that carries liquid to or from the D=propeller diameter in feet (meters). forepeak tank. This pipe must have a s=that fraction of the propeller circle cyl- screwdown valve that is— inder which would be intercepted by the (1) Operative from above the bulk- rudder if turned to 45 degrees from the head deck; and vessel’s centerline. (2) Attached to the bulkhead inside h=vertical distance from propeller shaft centerline at rudder to towing bitts in feet the forepeak tank. (meters). (i) Section 171.116 (b), (c), and (e) of D=displacement in long tons (metric tons). this subchapter. f=minimum freeboard along the length of the (j) Section 171.117(c) of this sub- vessel in feet (meters). chapter. B=molded beam in feet (meters).

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K=38 in English units. 174.015 Intact stability. K=13.93 in metric units. 174.020 Alternate intact stability criterion.

(c) When a heeling arm curve, cal- Subpart C—Special Rules Pertaining to culated in accordance with paragraph Mobile Offshore Drilling Units (d) of this section, is plotted against the vessel’s righting arm curve— 174.030 Specific applicability. (1) Equilibrium must be reached be- 174.035 Definitions. fore the downflooding angle; and 174.040 Stability requirements: general. 174.045 Intact stability requirements. (2) The residual righting energy must 174.050 Stability on bottom. be at least 2 foot-degrees (.61 meter-de- 174.055 Calculation of wind heeling moment grees) up to the smallest of the fol- (Hm). lowing angles: 174.065 Damage stability requirements. (i) The angle of maximum righting 174.070 General damage stability assump- arm. tions. (ii) The downflooding angle. 174.075 Compartments assumed flooded: gen- (iii) 40 degrees. eral. 174.080 Flooding on self-elevating and sur- (d) The heeling arm curve specified in face type units. paragraph (c) of this section must be 174.085 Flooding on column stabilized units. calculated by the following equation: 174.090 Permeability of spaces. 174.100 Appliances for watertight and weathertight integrity. × 2 2 (N)(P D) 3 (s)(h)(cos θ) Subpart D [Reserved] HA = KΔ Subpart E—Special Rules Pertaining to where— Tugboats and Towboats HA=heeling arm. 174.140 Specific applicability. q=angle of heel. 174.145 Intact stability requirements. N, P, D, K, s, h, and D are as defined in paragraph (b) of this section. Subpart F [Reserved] (e) For the purpose of this section, Subpart G—Special Rules Pertaining to downflooding angle means the static Offshore Supply Vessels angle from the intersection of the vessel’s centerline and waterline in calm 174.180 Applicability. water to the first opening that does not 174.185 Intact stability. close watertight automatically. 174.190 Collision bulkhead. 174.195 Bulkheads in machinery spaces. (f) For the purpose of this section, at 174.200 Damaged stability in machinery each angle of heel, a vessel’s righting spaces for all OSVs. arm may be calculated considering ei- 174.205 Additional damaged stability for ther— OSVs carrying more than 16 offshore (1) The vessel is permitted to trim workers. free until the trimming moment is 174.207 Damaged stability criteria. zero; or 174.210 Watertight doors in watertight bulkheads. (2) The vessel does not trim as it 174.215 Drainage of weather deck. heels. 174.220 Hatches and coamings. 174.225 Hull penetrations and shell connec- PART 174—SPECIAL RULES PER- tions. TAINING TO SPECIFIC VESSEL Subpart H—Special Rules Pertaining to TYPES Liftboats Subpart A—General 174.240 Applicability. 174.245 General. Sec. 174.250 Unrestricted service. 174.005 Applicability. 174.255 Restricted service. 174.007 Incorporation by reference. 174.260 Freeboard.

Subpart B—Special Rules Pertaining to Subpart I—Hopper Dredges With Working Deck Cargo Barges Freeboard Assignments 174.010 Specific applicability. 174.300 Specific applicability.

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174.305 Definitions. Register under 5 U.S.C. 552(a) and 1 CFR part 51. To enforce any edition CALCULATIONS other than that specified in this sec- 174.310 General. tion, the Coast Guard must publish a 174.315 Extent and character of damage. 174.320 Damage survival. notice of change in the FEDERAL REG- 174.325 Equalization. ISTER and the material must be avail- 174.330 Jettisoning of spoil. able to the public. All approved material is available for inspection at the DESIGN National Archives and Records Admin- 174.335 Watertight doors. istration (NARA). For information on 174.340 Collision bulkhead. the availability of this material at Subpart J—Special Rules Pertaining to Dry NARA, call 202–741–6030 or go to http:// Cargo Ships www.archives.gov/federallregister/ codeloflfederallregulations/ 174.350 Specific applicability. ibrllocations.html. It is also available 174.355 Definitions. for inspection at the Coast Guard, Of- 174.360 Calculations. fice of Design and Engineering Stand- AUTHORITY: 42 U.S.C. 9118, 9119, 9153; 43 ards, Naval Architecture Division (CG– U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Depart- ENG–2), 2100 2nd St. SW., Stop 7126, ment of Homeland Security Delegation No. Washington, DC 20593–7126, and is avail- 0170.1. able from the sources listed below. SOURCE: CGD 79–023, 48 FR 51048, Nov. 4, (b) American Society for Testing and 1983, unless otherwise noted. Materials (ASTM) 100 Barr Harbor Drive, West Conshohocken, PA 19428– Subpart A—General 2959. (1) ASTM F 1196–00, Standard Speci- § 174.005 Applicability. fication for Sliding Watertight Door Each of the following vessels must Assemblies, 2008, incorporation by ref- comply with the applicable provisions erence (IBR) approved for § 174.100. of this part: (2) ASTM F 1197–00, Standard Speci- (a) Deck cargo barge. fication for Sliding Watertight Door (b) Mobile offshore drilling unit Control Systems, 2007, IBR approved (MODU) inspected under subchapter IA for § 174.100. of this chapter. (c) International Maritime Organiza- (c) Tugboat and towboat inspected tion (IMO), Publications Section, 4 Al- under subchapter I of this chapter. bert Embankment, London SE1 7SR, (d) Self-propelled hopper dredge hav- United Kingdom, +44 (0)20 7735 7611, ing an assigned working freeboard. http://www.imo.org/. (e) Oceangoing ships of 500 gross tons (1) Resolution MSC.216(82), Adoption or over, as calculated by the Inter- national Convention on Tonnage Meas- of Amendments to the International urement of Ships, 1969, designed pri- Convention for the Safety of Life At marily for the carriage of dry cargoes, Sea, 1974, As Amended (IMO Res. including roll-on/roll-off ships. MSC.216(82)), Adopted on 8 December (f) Offshore supply vessel inspected 2006, IBR approved for § 174.360. under subchapter L of this chapter. (2) [Reserved] (g) Liftboat inspected under sub- [USCG–2007–0030, 75 FR 78086, Dec. 14, 2010, as chapter L of this chapter. amended by USCG–2012–0832, 77 FR 59788, Oct. [CGD 95–012, 60 FR 48052, Sept. 18, 1995; 60 FR 1, 2012] 50120, Sept. 28, 1995, as amended by CGD 82– 004 and CGD 86–074, 60 FR 57671, Nov. 16, 1995; Subpart B—Special Rules CGD 82–004 and CGD 86–074, 62 FR 49353, Sept. 19, 1997] Pertaining to Deck Cargo Barges

§ 174.007 Incorporation by reference. § 174.010 Specific applicability. (a) Certain material is incorporated Each barge that carries cargo above by reference into this part with the ap- the weather deck must comply with proval of the Director of the Federal this subpart.

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§ 174.015 Intact stability. § 174.035 Definitions. (a) Except as provided in § 174.020, in (a) For the purpose of this subpart each condition of loading and oper- the following terms have the same defi- ation, each barge must be shown by de- nitions as given in Subchapter IA of sign calculations to have an area under this chapter: the righting arm curve up to the angle (1) Column stabilized unit. of maximum righting arm, the (2) Mobile offshore drilling unit. downflooding angle, or 40 degrees, (3) Self-elevating unit. whichever angle is smallest, equal to or (4) Surface type unit. greater than— (b) For the purpose of this subpart— (1) 15 foot-degrees (4.57 meter-degrees) for ocean and Great Lakes win- (1) Downflooding means the entry of ter service; and seawater through any opening that (2) 10 foot-degrees (3.05 meter-de- cannot be rapidly closed watertight, grees) for lakes, bays, sounds, and into the hull, superstructure, or col- Great Lakes summer service. umns of an undamaged unit due to (b) For the purpose of this section, heel, trim, or submergence of the unit. downflooding angle means the static (2) Downflooding angle means the angle from the intersection of the ves- static angle from the intersection of sel’s centerline and waterline in calm the unit’s centerline and waterline in water to the first opening that does not calm water to the first opening close watertight automatically. through which downflooding can occur when subjected to a wind heeling mo- § 174.020 Alternate intact stability cri- ment (Hm) calculated in accordance terion. with § 174.055. A barge need not comply with (3) Normal operating condition means a § 174.015 and subparts C and E of part condition of a unit when loaded or ar- 170 of this chapter if it has the fol- ranged for drilling, field transit, or lowing characteristics: ocean transit. (a) The weather deck is watertight. (4) Severe storm condition means a con- (b) The barge’s hull proportions fall dition of a unit when loaded or ar- within any one of the ratios in cat- ranged to withstand the passage of a egories (A) through (D) in Table 174.020. severe storm. (c) The maximum cargo height is 30 feet (9.25 meters) or a value equal to § 174.040 Stability requirements: gen- the depth of the barge amidships, eral. whichever is less. Each unit must be designed to have at least 2 inches (50mm) of positive TABLE 174.020 metacentric height in the upright equilibrium position for the full range of Category Beam/depth ratio Draft/depth ratio drafts, whether at the operating draft A ...... 3.00 to 3.74 ...... Equal to or less for navigation, towing, or drilling than 0.70. afloat, or at a temporary draft when B ...... 3.75 to 3.99 ...... Equal to or less than 0.72. changing drafts. C ...... 4.00 to 4.49 ...... Equal to or less than 0.76. § 174.045 Intact stability requirements. D ...... 4,50 to 6.00 ...... Equal to or less than 0.80. (a) Each unit must be designed so that the wind heeling moments (Hm) and righting moments calculated for Subpart C—Special Rules Per- each of its normal operating conditions taining to Mobile Offshore and severe storm conditions, when Drilling Units plotted on GRAPH 174.045, define areas that satisfy the equation: § 174.030 Specific applicability. Area(A)≥(K)×(Area (B)) Each mobile offshore drilling unit (MODU) inspected under Subchapter IA where— of this chapter must comply with this (1) K=1.4 except that if the unit is a column subpart. stabilized unit K=1.3;

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(2) Area (A) is the area on GRAPH 174.045 ings through which downflooding could under the righting moment curve be- occur if they can be rapidly closed and tween 0 and the second intercept angle or would not be submerged below the the angle of heel at which downflooding units’ waterline prior to the first inter- would occur, whichever angle is less; and (3) Area (B) is the area on GRAPH 174.045 cept angle, except that ventilation in- under the wind heeling moment curve be- takes and outlets for machinery tween 0 and the second intercept angle or spaces, crew spaces, and other spaces the angle of heel at which downflooding where ventilation is normally required of the unit would occur whichever angle are considered as openings through is less. which downflooding could occur re- (b) Each righting moment on graph gardless of location. § 174.045 must be positive for all angles (d) Each unit must be designed so greater than 0 and less than the second that it can be changed from each of its intercept angle. normal operating conditions to a se- (c) For the purposes of this section, vere storm condition within a min- openings fitted with the weathertight imum period of time consistent with closing appliances specified in the operating manual required in § 174.100(b) are not considered as open- § 109.121 of this chapter.

[CGD 79–023, 48 FR 51048, Nov. 4, 1983, as amended by CGD 83–071, 52 FR 6979, Mar. 6, 1987]

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§ 174.050 Stability on bottom. of the projected areas of both the front Each bottom bearing unit must be and back sides of the open truss work designed so that, while supported on rather than by determining the pro- the sea bottom with footings or a mat, jected area of each structural member it continually exerts a downward force of the truss work. on each footing or the mat when sub- TABLE 174.055(a)—CH VALUES jected to the forces of wave and current and to wind blowing at the velocities Feet Meters described in § 174.055(b)(3). Not ex- Not ex- Ch. Over ceeding Over ceeding § 174.055 Calculation of wind heeling moment (Hm). 0 50 0.0 15.3 1.00 50 100 15.3 30.5 1.10 (a) The wind heeling moment (Hm) of 100 150 30.5 46.0 1.20 a unit in a given normal operating con- 150 200 46.0 61.0 1.30 200 250 61.0 76.0 1.37 dition or severe storm condition is the 250 300 76.0 91.5 1.43 sum of the individual wind heeling mo- 300 350 91.5 106.5 1.48 ments (H) calculated for each of the ex- 350 400 106.5 2.0...... 1.52 400 450 122.0 137.0 1.56 posed surfaces on the unit; i.e., Hm=S 450 500 137.0 152.5 1.60 H. 500 550 152.5 167.5 1.63 (b) Each wind heeling moment (H) 550 600 167.5 183.0 1.67 600 650 183.0 198.0 1.70 must be calculated using the equation: 650 700 198.0 213.5 1.72 2 700 750 213.5 228.5 1.75 H=k(v) (Ch)(Cs)(A)(h) 750 800 228.5 244.0 1.77 where— 800 850 244.0 256.0 1.79 Above 850 Above 256 1.80 (1) H=wind heeling moment for an exposed NOTE: The ‘‘Ch’’ value in this table, used in the equation de- surface on the unit in foot-pounds (kilo- scribed in section § 174.055(b), corresponds to the value of gram-meters); the vertical distance in feet (meters) from the water surface at (2) k=0.00338 lb./(ft.2-knots2) (0.0623 (kg-sec2)/ the design draft of the unit to the center of area of the ‘‘A’’ m4); value used in the equation. (3) v=wind velocity of— (i) 70 knots (36 meters per second) for normal TABLE 174.055(b)—CS VALUES operating conditions. Shape Cs. (ii) 100 knots (51.5 meters per second) for severe storm conditions. Cylindrical shapes ...... 0.5 (iii) 50 knots (25.8 meters per second) for Hull (surface type) ...... 1.0 damage conditions. Deckhouse ...... 1.0 (4) A=projected area in square feet (squrae Cluster of deckhouses ...... 1.1 meters) of an exposed surface on the Isolated structural shapes (cranes, angles, channels, beams, etc.) ...... 1.5 unit; Under deck areas (smooth surfaces) ...... 1.0 (5) Ch=height coefficient for ‘‘A’’ from Table Under deck areas (exposed beams and girders) ...... 1.3 174.055(a); Rig derrick (each face and open truss works) ...... 1.25 (6) Cs=shape coefficient for ‘‘A’’ from Table NOTE: The ‘‘Cs’’ value in this table, used in the equation de- 174.055(b); and scribed in § 174.055(b), corresponds to the shape of the pro- (7) h=the vertical distance in feet (meters) jected ‘‘A’’ in the equation. from the center of lateral resistance of the underwater hull to the center of wind § 174.065 Damage stability require- pressure on ‘‘A’’. ments. (c) When calculating ‘‘A’’ in the (a) Each unit must be designed so equation described in paragraph (b) of that, while in each of its normal oper- this section— ating conditions and severe storm con- (1) The projected area of each column ditions, its final equilibrium waterline or leg; if the unit has columns or legs, would remain below the lowest edge of must not include shielding allowances; any opening through which additional (2) Each area exposed as a result of flooding could occur if the unit were heel must be included; subjected simultaneously to— (3) The projected area of a cluster of (1) Damage causing flooding de- deck houses may be used instead of the scribed in §§ 174.075 through 174.085; and projected area of each individual deck (2) A wind heeling moment cal- house in the cluster; and culated in accordance with § 174.055(b) (4) The projected area of open truss using a wind velocity of 50 knots (25.8 work may be calculated by taking 30% meters per second).

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(b) Each unit must have a means to unit, must be assumed to be subject to close off each pipe, ventilation system, flooding as follows: and trunk in each compartment de- (1) When a column is subdivided into scribed in § 174.080 or § 174.085 if any por- watertight compartments by hori- tion of the pipe, ventilation system, or zontal watertight flats, all compart- trunk is within 5 feet (1.5 meters) of ments in the column within 5 feet (1.5 the hull. meters) of the unit’s waterline before damage causing flooding must be as- § 174.070 General damage stability assumed to be subject to simultaneous sumptions. flooding. For the purpose of determining com- (2) When a column is subdivided into pliance with § 174.065, the assumptions watertight compartments by vertical are made that during flooding and the watertight bulkheads, each two adja- resulting change in the unit’s water- cent compartments must be assumed line— subject to simultaneous flooding if the (a) The unit is not anchored or distance between the vertical water- moored; and tight bulkheads, measured at the col- (b) No compartment on the unit is umn periphery, is equal to or less than ballasted or pumped out to compensate one-eighth of the column perimeter at for the flooding described in §§ 174.075 the draft under consideration. through 174.085. (3) When a column is subdivided into watertight compartments by hori- § 174.075 Compartments assumed zontal watertight flats and vertical wa- flooded: general. tertight bulkheads, those compartments that are within the bounds de- The individual flooding of each of the scribed in paragraph (a)(2) of this sec- compartments described in §§ 174.080 tion and within 5 feet (1.5 meters) of and 174.085 must be assumed for the the unit’s waterline before damage purpose of determining compliance causing flooding must be assumed to be with § 174.065 (a). Simultaneous flood- subject to simultaneous flooding. ing of more than one compartment (b) Each compartment in a footing must be assumed only when indicated must be assumed to be subject to indi- in §§ 174.080 and 174.085. vidual flooding when any part of the compartment is within 5 feet (1.5 me- § 174.080 Flooding on self-elevating and surface type units. ters) of the unit’s waterline before damage causing flooding. (a) On a surface type unit or self-elevating unit, all compartments within 5 § 174.090 Permeability of spaces. feet (1.5 meters) of the hull of the unit When doing the calculations required between two adjacent main watertight in § 174.065— bulkheads, the bottom shell, and the (a) The permeability of a floodable uppermost continuous deck or first su- space, other than a machinery space, perstructure deck where super- must be as listed in Table 174.090; and structures are fitted must be assumed (b) Calculations in which a machin- to be subject to simultaneous flooding. ery space is treated as a floodable (b) On the mat of a self-elevating space must be based on an assumed ma- unit, all compartments of the mat chinery space permeability of 85%, un- must be assumed to be subject to indi- less the use of an assumed permeability vidual flooding. of less than 85% is justified in detail.

§ 174.085 Flooding on column sta- TABLE 174.090—PERMEABILITY bilized units. Permeability (a) Watertight compartments that Spaces and tanks (percent) are outboard of, or traversed by, a plane which connects the vertical Storeroom spaces ...... 60. Accommodation spaces ...... 95. centerlines of the columns on the pe- Voids ...... 95. riphery of the unit, and within 5 feet Consumable liquid tanks ...... 95 or 0.1 (1.5 meters) of an outer surface of a col- Other liquid tanks ...... 95 or 0.2 umn or footing on the periphery of the 1 Whichever results in the more disabling condition.

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2 If tanks are partially filled, the permeability must be deter- mote manual means of closure, as spec- mined from the actual density and amount of liquid carried. ified in paragraphs 7.1 and 7.5.1, and a § 174.100 Appliances for watertight remote mechanical indicator, as speci- and weathertight integrity. fied in paragraph 7.5.2, will not be re- (a) Appliances to insure watertight quired; and integrity include watertight doors, (3) If installed in a subdivision bulk- hatches, scuttles, bolted manhole cov- head, meet Supplemental Require- ers, or other watertight closures for ments Nos. S1 and S3 of ASTM F 1196 openings in watertight decks and bulk- (incorporated by reference, see heads. § 174.007), unless the watertight doors (b) Appliances to insure weathertight are built in accordance with plans pre- integrity include weathertight doors viously approved by the Coast Guard, and hatches, closures for air pipes, ven- in which case, only Supplemental Re- tilators, ventilation intakes and out- quirements Nos. S1 and S3.1.4 of ASTM lets, and closures for other openings in F 1196 (incorporated by reference, see deckhouses and superstructures. § 174.007) must be met. In either case, (c) Each internal opening equipped control systems for watertight doors with appliances to insure watertight must have power supplies, power integrity that is used intermittently sources, installation tests and inspec- during operation of the unit while tion, and additional remote operating afloat must meet the following: consoles in accordance with Supple- (1) Each door, hatch, and scuttle mental Requirements Nos. S1 through must— S4 of ASTM F 1197 (incorporated by ref- (i) Be remotely controlled from a erence, see § 174.007). normally manned control station, and (f) Installations of sliding watertight be operable locally from both sides of door assemblies must be in accordance the bulkhead; or with the following: (ii) If there is no means of remote (1) Before a sliding watertight door control there must be an alarm system assembly is installed in a vessel, the that signals whether the appliance is bulkhead in the vicinity of the door open or closed both locally at each ap- opening must be stiffened. Such bulk- pliance and in a normally manned con- head stiffeners, or deck reinforcement trol station. where flush deck door openings are de- (2) Each closing appliance must re- sired, must not be less than 6 inches main watertight under the design nor more than 12 inches from the door water pressure of the watertight frame so that an unstiffened diaphragm boundary of which it is a part. of bulkhead plating 6 to 12 inches wide (d) Each external opening fitted with is provided completely around the door an appliance to insure weathertight in- frame. Where such limits cannot be tegrity must be located so that it would not be submerged below the final maintained, alternative installations equilibrium waterline if the unit is will be considered by the Marine Safe- subjected simultaneously to— ty Center. In determining the (1) Damage causing flooding de- scantlings of these bulkhead stiffeners, scribed in §§ 174.075 through 174.085; and the door frame should not be consid- (2) A wind heeling moment cal- ered as contributing to the strength of culated in accordance with § 174.055 the bulkhead. Provision must also be using a wind velocity of 50 knots (25.8 made to adequately support the thrust meters per second). bearings and other equipment that (e) If a unit is equipped with sliding may be mounted on the bulkhead or watertight doors, each sliding water- deck. tight door must— (2) Sliding watertight door frames (1) Be designed, constructed, tested, must be either bolted or welded water- and marked in accordance with ASTM tight to the bulkhead. F 1196 (incorporated by reference, see (i) If bolted, a suitable thin heat and § 174.007); fire resistant gasket or suitable com- (2) Have controls in accordance with pound must be used between the bulk- ASTM F 1197 (incorporated by ref- head and the frame for watertightness. erence, see § 174.007), except that a re- The bulkhead plating shall be worked

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to a plane surface in way of the frame Subpart G—Special Rules Per- when mounting. taining to Offshore Supply (ii) If welded, caution must be exer- Vessels cised in the welding process so that the door frame is not distorted. SOURCE: CGD 82–004 and CGD 86–074, 62 FR [CGD 79–023, 48 FR 51048, Nov. 4, 1983, as 49353, Sept. 19, 1997, unless otherwise noted. amended by CGD 88–032, 56 FR 35828, July 29, 1991; USCG–2000–7790, 65 FR 58464, Sept. 29, § 174.180 Applicability. 2000] Each offshore supply vessel (OSV), Subpart D [Reserved] except a liftboat inspected under subchapter L of this chapter, must comply with this subpart. Subpart E—Special Rules Per- taining to Tugboats and § 174.185 Intact stability. Towboats (a) Each OSV must be shown by de- § 174.140 Specific applicability. sign calculations to meet, under each condition of loading and operation, the Each tugboat and towboat inspected minimal requirements for metacentric under subchapter I of this chapter height (GM) in § 170.170 of this chapter, must comply with this subpart. and in either § 170.173 of this chapter or § 174.145 Intact stability requirements. paragraphs (b) through (e) of this section. (a) In each condition of loading and (b) The area under each righting arm operation, each vessel must be shown curve must be at least 0.08 meter-radi- by design calculations to meet the re- ans (15 foot-degrees) up to the smallest quirements of paragraphs (b) through of the following angles: (e) of this section. (b) The area under each righting arm (1) The angle of maximum righting curve must be at least 16.9 foot-degrees arm; (5.15 meter-degrees) up to the smallest (2) The downflooding angle; or of the following angles: (3) 40 degrees. (1) The angle of maximum righting (c) The downflooding angle must not arm. be less than 20 degrees. (2) The downflooding angle. (d) The righting arm curve must be (3) 40 degrees. positive to at least 40 degrees. (c) The area under each righting arm (e) The freeboard at the stern must curve must be at least 5.6 foot-degrees be equal to the freeboard calculated to (1.72 meter-degrees) between the angles comply with subchapter E of this chap- of 30 degrees and 40 degrees, or between ter or to the value taken from Table 30 degrees and the downflooding angle 174.185, whichever is less. if this angle is less than 40 degrees. (f) For paragraphs (b) and (d) of this (d) The maximum righting arm shall section, at each angle of heel an OSV’s occur at a heel of at least 25 degrees. righting arm may be calculated consid- (e) The righting arm curve must be ering either— positive to at least 60 degrees. (1) The vessel is permitted to trim (f) For the purpose of this section, at free until the trimming moment is each angle of heel, a vessel’s righting zero; or arm may be calculated considering ei- (2) The vessel does not trim as it ther— heels. (1) The vessel is permitted to trim (g) For the purpose of paragraphs (b) free until the trimming moment is zero; or and (d) of this section, the method of (2) The vessel does not trim as it calculating righting arms chosen must heels. be the same for all calculations.

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TABLE 174.185—MINIMAL FREEBOARD AT THE ation, with § 174.207 of this subpart in STERN case of damage between any two watertight bulkheads in each machinery Freeboard at stern in space. LBP in meters (feet) millimeters (inches) § 174.205 Additional damaged stability Less than 20 (65) ...... 300 (12) for OSVs carrying more than 16 off- 20 (65) but less than 30 (100) ...... 380 (15) shore workers. 30 (100) but less than 40 (130) ...... 400 (18) (a) Calculations. Each OSV carrying 40 (130) but less than 50 (155) ...... 500 (20) 50 (155) but less than 60 (190) ...... 560 (22) more than 16 offshore workers must be 60 (190) but less than 70 (230) ...... 610 (24) shown by design calculations to com- 70 (230) and greater ...... 660 (26) ply, under each afloat condition of loading and operation, with § 174.207 of § 174.190 Collision bulkhead. this subpart in case of the damage (a) Each OSV must have a collision specified by paragraph (b) of this sec- bulkhead in compliance with tion. §§ 171.085(c)(1), (d), (e)(2), and (f) of this (b) Character of damage. For para- chapter. graph (a) of this section, design cal- (b) Penetration of the collision bulk- culations must show that the OSV can head by piping must be minimal, and, survive damage at any place other than where fitted, piping must meet the re- either the collision bulkhead or a quirements of §§ 56.50–1(b)(1) and (c) and transverse watertight bulkhead un- 128.230 of this chapter. less— (1) The transverse watertight bulk- § 174.195 Bulkheads in machinery head is closer than the longitudinal ex- spaces. tent of damage, specified by Table (a) The bulkhead in each machinery 174.207(a), to the adjacent transverse space of each OSV must be watertight watertight bulkhead; or to the bulkhead deck. (2) The transverse watertight bulk- (b) Each penetration of, and each head has a step or a recess, which must opening in, a bulkhead in a machinery be assumed damaged, if it is both more space must— than 3 meters (10 feet) in length and lo- (1) Be kept as high and as far inboard cated within the transverse extent of as practicable; and damage specified by Table 174.207(a) of (2) Except as provided by § 174.210 of this section. this subpart and by paragraph (c) of this section, have means to make it § 174.207 Damaged stability criteria. watertight. (a) Extent of damage. Damage must (c) No penetration of a bulkhead in a consist of penetrations having the di- machinery space by a ventilation duct mensions specified by table 174.207(a) of need have means to make the bulkhead this section, except that, if the most watertight if— disabling penetrations are smaller than (1) Every part of the duct is at least the penetrations specified by the table, 760 millimeter (30 inches) from the side damage must consist of the smaller of the OSV; and penetrations. (2) The duct is continuously water- (b) Permeability of spaces. The perme- tight from the penetration to the main ability of a floodable space must be as deck. specified by Table 174.207(b) of this sec- (d) Each penetration of a bulkhead in tion. a machinery space by piping must meet (c) Survival conditions. An OSV is pre- the design requirements for material sumed to survive assumed damage if it and pressure in subchapter F of this meets the following conditions in the chapter. final stage of flooding: (1) Final waterline. The final water- § 174.200 Damaged stability in machin- line, in the final stage of sinkage, heel, ery spaces for all OSVs. and trim, must be below the lower edge Each OSV must be shown by design of an opening through which progres- calculations to comply, under each sive flooding may take place, such as afloat condition of loading and oper- an air pipe, a tonnage opening, an

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opening closed by a weathertight door TABLE 174.207(a)—EXTENT OF DAMAGE— or hatch-cover, or a tank vent fitted Continued with a ball check-valve. This opening does not include an opening closed by Vertical extent...... From baseline upward a— without limit. (i) Watertight manhole-cover; *The transverse penetration applies inboard from the side of the vessel, at right angles to the centerline, at the level of (ii) Flush scuttle; the deepest load waterline. (iii) Small hatch-cover for a watertight cargo-tank that maintains the TABLE 174.207(b)—PERMEABILITY OF SPACES

high integrity of the deck; Spaces and tanks Permeability (iv) Watertight door in compliance with § 174.210 of this subpart; or Storerooms ...... 60 percent. Accommodations ...... 95 percent. (v) Side scuttle of the non-opening Machinery ...... 85 percent. type. Voids and passageways ...... 95 percent. (2) Angle of heel. The angle of heel Dry-bulk tanks ...... 0 (*) or 95 percent. must not exceed 15 degrees. Consumable-liquid tanks ...... 0 (*) or 95 percent. Other liquid tanks ...... 0 (*) 0 (**) or 95 percent. (3) Range of stability. Through an angle of 20 degrees beyond its position *Whichever results in the more disabling condition. **If tanks are partly filled, the permeability must be deter- of equilibrium after flooding, an OSV mined from the actual density and amount of liquid carried. must meet the following conditions: (i) The righting arm curve must be § 174.210 Watertight doors in water- positive. tight bulkheads. (ii) The righting arm must be at least (a) This section applies to each vessel 100 millimeters (4 inches). with watertight doors in bulkheads (iii) Each submerged opening must be made watertight in compliance with weathertight. (A tank vent fitted with this chapter. a ball check-valve is weathertight.) (b) Except as provided by paragraph (4) Progressive flooding. Piping, ducts, (c) of this section, each watertight door or tunnels within the assumed extent must comply with subpart H of part 170 of damage must be either— of this chapter. (c) A Class-1 door may be installed at (i) Equipped with arrangements, such any place if— as stop check-valves, to prevent pro- (1) The door has a quick-acting clos- gressive flooding of the spaces with ing-device operative from both sides of which they connect; or the door; (ii) Assumed in the calculations re- (2) The door is designed to withstand quired by paragraph (a) of this section a head of water equivalent to the depth to permit progressive flooding of the from the sill of the door to the bulk- spaces with which they connect. head deck or 3 meters (10 feet), which- (d) Buoyancy of superstructure. For ever is greater; and paragraph (a) of this section, the buoy- (3) The vessel’s pilothouse contains a ancy of any superstructure directly visual indicator showing whether the above the side damage must be consid- door is open or closed. ered in the most unfavorable condition. (d) Each watertight door must be marked in compliance with § 131.893 of TABLE 174.207(a)—EXTENT OF DAMAGE this chapter. (e) If a Class-1 door is installed, the Collision Penetration vessel’s stability letter will require the Longitudinal extent (ves- .1L or 1.8 meters (6 master to ensure that the door is al- sels with LBP not feet):, whichever is ways closed except when being used for greater than 45 meters greater in length. access. [143 feet]). Longitudinal extent (ves- 3 meters (10 feet) + § 174.215 Drainage of weather deck. sels with LBP greater .03L. than 45 meters [143 The weather deck must have open feet]). rails to allow rapid clearing of water, Transverse extent* ...... 760 millimeters (30 or must have freeing ports in compli- inches). ance with § 42.15–70 of this chapter.

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§ 174.220 Hatches and coamings. part C of this part in each condition of (a) Each hatch exposed to the weath- loading and operation. er must be watertight, except that the § 174.255 Restricted service. following hatches may be only weathertight: This section applies to each liftboat (1) Each hatch on a watertight trunk unable to comply with § 174.250 and lim- that extends at least 430 millimeters ited to restricted service as defined by (17 inches) above the weather deck. § 125.160 of this chapter. (2) Each hatch in a cabin top. (a) Intact stability. (1) Each liftboat (b) Each hatch cover must— must be shown by design calculations (1) Have securing-devices; and to meet, under each condition of load- (2) Be attached to the hatch frame or ing and operation afloat, the following coaming by hinges, captive chains, or requirements: other devices to prevent its loss. (i) Those imposed by § 174.045, given a (c) Each hatch that provides access ‘‘K’’ value of at least 1.4. to quarters or to accommodation (ii) A range of positive stability of at spaces for crew members or offshore least 10 degrees extending from the workers must be capable of being angle of the first intercept of the opened and closed from either side. curves of righting moment and wind (d) Except as provided by paragraph heeling moment, either to the angle of (e) of this section, a weathertight door the second intercept of those curves or with a permanent watertight coaming to the angle of heel at which at least 380 millimeters (15 inches) high downflooding would occur, whichever must be installed for each opening in a deckhouse or companionway that— angle is less. (1) Gives access into the hull; and (iii) A residual righting energy of at (2) Is in an exposed place. least 0.003 meter radians (5 foot-de- (e) If an opening in a deckhouse or grees) between the angle of the first companionway has a Class-1 watertight intercept of the curves of righting mo- door installed, the height of the water- ment and wind heeling moment, either tight coaming need only accommodate to the angle of the second intercept of the door. those curves or to the angle of heel at which downflooding would occur, § 174.225 Hull penetrations and shell whichever angle is less. connections. (2) For this section, each wind heel- Each overboard discharge and shell ing moment must be calculated as pre- connection except an engine exhaust scribed by § 174.055 of this part using must comply with §§ 56.50–95 and 128.230 winds of 60 knots for normal conditions of this chapter. of operation afloat and of 70 knots for severe-storm conditions of operation Subpart H—Special Rules afloat. Pertaining to Liftboats (3) For paragraph (a)(1) of this section, the initial metacentric height SOURCE: CGD 82–004 and CGD 86–074, 62 FR must be at least 300 millimeters (1 foot) 49355, Sept. 19, 1997, unless otherwise noted. for each leg position encountered while afloat including the full range of leg § 174.240 Applicability. positions encountered while jacking. Each liftboat inspected under sub- (b) Damaged stability. (1) Each liftboat chapter L of this chapter must comply must be designed so that, while it is in with this subpart. each of its normal operating conditions, its final equilibrium waterline § 174.245 General. will remain below the lowest edge of Each liftboat must comply with any opening through which additional §§ 174.210 through 174.225. flooding can occur if the liftboat is subjected simultaneously to— § 174.250 Unrestricted service. (i) Damage causing flooding de- Each liftboat not limited to re- scribed by paragraph (b)(4) of this sec- stricted service must comply with sub- tion; and

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(ii) A wind heeling moment cal- weather deck and the outer surface of culated in compliance with § 174.055(b) the shell. This distance must be at using a wind speed of 50 knots. least 610 millimeters (24 inches). (2) Each liftboat must have a means (b) The markings required by para- of closing off each pipe, ventilation graph (a) of this section may not be system, and trunk in each compart- submerged in any condition of loading ment described by paragraph (b)(4) of or operation. this section if any part of the pipe, ventilation system, or trunk is within 760 Subpart I—Hopper Dredges With millimeters (30 inches) of the hull. Working Freeboard Assignments (3) For compliance with paragraph (b)(1) of this section, no compartment on the liftboat may be ballasted or SOURCE: CGD 76–080, 54 FR 36977, Sept. 6, pumped out to compensate for the 1989, unless otherwise noted. flooding described by paragraph (b)(4) § 174.300 Specific applicability. of this section. (4) For compliance with paragraph This subpart applies to each self-pro- (b)(1) of this section, each compart- pelled hopper dredge for which a work- ment within 760 millimeters (30 inches) ing freeboard assignment is being of the hull, excluding the bottom of the sought under part 44, subpart C, of this liftboat, between two adjacent main chapter. watertight bulkheads and the uppermost continuous deck or first super- § 174.305 Definitions. structure deck where superstructures Hopper dredge has the same meaning are fitted must be assumed subject to as contained in § 44.310 of this chapter. simultaneous flooding. Length has the same meaning as con- (5) In the calculations required by tained in § 42.13–15(a) of this chapter. paragraph (b)(1) of this section, the Working freeboard has the same mean- permeability of a floodable space must ing as contained in § 44.310 of this chap- be as listed by Table 174.205(d). ter. (c) On-bottom stability. Each liftboat must be shown by design calculations CALCULATIONS to exert a continuous downward force on each footing when the vessel is sup- § 174.310 General. ported on the bottom with footings and (a) Each hopper dredge under this is subjected to the forces of waves, cur- subpart must be shown by design cal- rents, and winds of 70 knots under nor- culations based on the assumptions mal conditions of operation, and winds under paragraphs (b), (c), (d), and (e) of of 100 knots under severe-storm condi- this section, that it meets— tions of operation when elevated in a (1) The requirements in §§ 170.170, safe place, if this place is other than a 170.173, and 170.300 of this chapter in harbor of safe refuge. The waves and each condition of loading and oper- currents must be appropriate for the ation; and winds and place. (2) The survival conditions of § 174.320 in each condition of loading and oper- § 174.260 Freeboard. ation assuming the character and ex- (a) Each liftboat not required to ob- tent of damage specified in § 174.315. tain and maintain a loadline in compli- (b) The calculations required by para- ance with subchapter E of this chapter graph (a) of this section must assume: must place markings on each side of (1) The hoppers are full of seawater; the vessel amidships. These markings (2) The permeability of flooded spaces must each consist of a horizontal line is as provided by Table 174.310; 460 millimeters (18 inches) in length (3) The equalization provisions of and 25 millimeters (1 inch) in height. § 174.325; and The upper edges of the markings must (4) The jettisoning provisions of be at a distance equal to the authorized § 174.330. freeboard measured vertically below (c) The calculations required by this the intersection of the continuation section must take into account a suffi- outwards of the upper surface of the cient number of loading conditions to

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identify the condition in which the ves- TABLE 174.315—EXTENT OF DAMAGE sel is least stable, including, but not COLLISION PENETRATION limited to, the most severe loading condition, and the: Longitudinal extent ...... 0.495L2/3 or 47.6 feet. (1) Specific gravity of the dredge [(1⁄3)(L)2/3 or 14.5 meters] whichever is less. spoil, from 1.02 up to and including the 1 maximum required by paragraph (e)(1) Transverse extent ...... B/5 or 37.7 feet. (11.5 meters), whichever is of this section; and less. (2) Draft, up to and including the Vertical extent ...... From the base line up- draft corresponding to the working ward without limit. freeboard for the full range of trim. 1 Damage applied inboard from the vessel’s side at a right (d) The calculations required by this angle to the centerline at the draft corresponding to the section for a dredge with open hoppers working freeboard assigned under subchapter E of this may include spillage of spoil from the chapter. hopper resulting from changing the § 174.320 Damage survival. angle of heel and trim. (e) The following assumptions must A hopper dredge survives assumed be made when doing the calculations damage if it meets the following condi- required by this section: tions: (1) Dredged spoil in the hopper is a (a) The maximum angle of heel in homogeneous liquid with a maximum each stage of flooding must not exceed specific gravity for the areas of oper- 30 degrees or the angle of downflooding ation. whichever is less. (2) When calculating the vessel’s (b) The final waterline, taking into righting arm, it is assumed at each account sinkage, heel, and trim, must angle of heel that the vessel trims free be below the lowest edge of each open- and the trimming moment is zero. ing through which progressive flooding TABLE 174.310—PERMEABILITY OF FLOODABLE may take place. SPACES (c) The righting arm curve calculated after damage must: Spaces and tanks Permeability (1) Have a minimum positive range of Storerooms ...... 0.60 20 degrees beyond the angle of equi- Accommodation spaces ...... 0.95 librium; and Consumable liquid tanks ...... 0.00 or 0.95—whichever results in the more disabling (2) Reach a height of at least 4 inches condition. (l00mm) within the 20 degree positive Machinery space ...... 0.85—unless otherwise sup- range. ported by calculations. Cargo tanks ...... Determined from the actual (d) Each opening within, or partially density and amount of liq- within, the 20 degree range beyond the uid carried in the tank. angle of equilibrium must be weathertight. § 174.315 Extent and character of dam- (e) After flooding or equalization as age. allowed by § 174.325, the hopper dredge’s (a) The calculations required by metacentric height must be at least 2 § 174.310 must show that the dredge can inches (50mm) when the dredge is in an survive damage at any location along upright position. the length of the vessel including at a transverse bulkhead in accordance § 174.325 Equalization. with paragraph (b) of this section. (b) The calculations required by para- When doing the calculations required graph (a) of this section must assume by § 174.310 of this subpart— the most disabling side penetration (a) Equalization arrangements re- with the damage collision penetration quiring mechanical aids, such as provided by Table 174.315, except that if valves, may not be assumed to be effec- the most disabling damage collision tive in reducing the angle of heel; and penetrations would be less than those (b) Spaces joined by ducts may be as- provided by Table 174.315, the smaller sumed to be common spaces only if damage collision penetration must be equalization takes place within 15 min- assumed. utes after flooding begins.

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§ 174.330 Jettisoning of spoil. proved under § 170.270 of this chapter, (a) When doing the calculations re- or quick acting hinged watertight quired by § 174.310 for a hopper dredge doors (Class 1) approved under the with bottom doors, it may be assumed same subpart if the sill of the water- that the spoil is jettisoned imme- tight door is— diately after damage and that the bot- (1) Installed below the bulkhead tom doors remain open if: deck; and (1) The bottom doors are designed so (2) Greater than 24 inches above the that they may be fully opened from: final waterline as shown by the cal- (i) The closed position within two culations required by § 174.310 in each minutes even if the main power source damage condition up to and including is lost or the bottom door actuating the maximum amount of assumed dam- mechanism is damaged; and age. (ii) The navigating bridge; [CGD 76–080, 54 FR 36977, Sept. 6, 1989, as (2) The discharge area through the amended by CGD 95–072, 60 FR 50468, Sept. 29, bottom doors is equal to or greater 1995] than 30 percent of the maximum cross sectional area of the hopper measured § 174.340 Collision bulkhead. in a plane parallel to the waterline; Each hopper dredge must have a col- and lision bulkhead that is located not less (3) Asymmetrical jettisoning of the than 5 percent of the length abaft of spoil is impossible. the forward perpendicular. (b) When doing the calculations required by § 174.310 for a hopper dredge with a split hull, it may be assumed Subpart J—Special Rules that the spoil is jettisoned imme- Pertaining to Dry Cargo Ships diately after damage if— (1) The hull is designed so that— SOURCE: CGD 87–094, 58 FR 17320, Apr. 1, (i) The complete separation is ef- 1993, unless otherwise noted. fected within two minutes even if the main power source is lost or the actu- § 174.350 Specific applicability. ating means is damaged; and This subpart applies to each new ship (ii) The actuating means can be oper- of 500 gross tons or over, as calculated ated from the navigating bridge; by the International Convention on (2) It is shown to the Commanding Tonnage Measurement of Ships, 1969, Officer, Marine Safety Center, either designed primarily for the carriage of by calculations or by operational tests, dry cargoes, including roll-on/roll-off that the hulls can separate sufficiently ships and integrated tug and barges to allow the dredged material to dump (ITBs) when operating as a combined without bridging; and unit. (3) Asymmetrical jettisoning of the spoil is impossible. § 174.355 Definitions.

DESIGN New ship means a ship: (1) For which the building contract is § 174.335 Watertight doors. placed on or after February 1, 1992; or (a) Each hopper dredge must have (2) In the absence of a building con- sliding watertight doors (Class 3) ap- tract, the keel of which is laid or which proved under § 170.270 of this chapter if is at a similar stage of construction on the sill for the door is— or after August 1, 1992; or (1) Installed below the bulkhead (3) The delivery of which is on or deck; and after February 1, 1997; or (2) Less than 24 inches above the final (4) For which application for reflag- waterline as shown by the calculations ging is made on or after February 1, required by § 174.310 in each damage 1997; or condition up to and including the max- (5) Which has undergone a major con- imum amount of assumed damage. version: (b) Each hopper dredge must have (i) For which the contract is placed sliding watertight doors (Class 3) ap- on or after February 1, 1992; or

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(ii) In the absence of a contract, the reference, see § 174.007). Compliance construction work of which is begun on with the applicable requirements must or after August 1, 1992; or be demonstrated by calculations and (iii) Which is completed on or after reflected in information on loading re- February 1, 1997. strictions, such as a maximum height of the center of gravity (KG) or min- § 174.360 Calculations. imum metacentric height (GM) curve, Each ship to which this subpart ap- that is part of the stability informa- plies must comply with the minimum tion required by § 170.110 of this chap- standard of subdivision and damage ter. stability applicable to that ship under IMO Res. MSC.216(82), (incorporated by [USCG–2007–0030, 75 FR 78086, Dec. 14, 2010]

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