Coast Guard, Dept. of Homeland Security § 56.50–50 two or more boilers, a nonreturn valve § 56.50–50 Bilge and ballast piping. shall be provided in the line from each (a)(1) All vessels except unmanned boiler to prevent accidental blowback barges shall be provided with a satis- in the event the boiler blowoff valve is factory bilge pumping plant capable of left open. pumping from and draining any water- (b) Blowoff piping external to the tight compartment except for ballast, boiler shall be designed for not less oil and water tanks which have accept- than 125 percent of the maximum al- able means for filling and emptying lowable working pressure of the boiler, independent of the bilge system. The or the maximum allowable working bilge pumping system shall be capable pressure of the boiler plus 225 pounds of operation under all practicable con- per square inch, whichever is less. ditions after a casualty whether the When the required blowoff piping de- ship is upright or listed. For this pur- sign pressure exceeds 100 pounds per pose wing suctions will generally be square inch gage, the wall thickness of necessary except in narrow compart- the piping shall not be less than Sched- ments at the ends of the vessel where ule 80. The value of allowable stress for one suction may be sufficient. In com- design purposes shall be selected as de- partments of unusual form, additional scribed in § 56.07–10(e) at a temperature suctions may be required. not below that of saturated steam at (2) Arrangements shall be made the maximum allowable working pres- whereby water in the compartments sure of the boiler. will drain to the suction pipes. Effi- cient means shall be provided for (c) Boiler blowoff piping which dis- draining water from all tank tops, charges above the lightest loadline of a other watertight flats and insulated vessel shall be arranged so that the dis- holds. Peak tanks, chain lockers and charge is deflected downward. decks over peak tanks may be drained (d) Valves such as the globe type so by eductors, ejectors, or hand pumps. designed as to form pockets in which Where piping is led through the sediment may collect shall not be used forepeak, see § 56.50–1(b). for blowoff service. (3) Where drainage from particular [CGFR 68–82, 33 FR 18843, Dec. 18, 1968, as compartments is considered undesir- amended by CGFR 69–127, 35 FR 9978, June 17, able, the provisions for such drainage 1970; CGD 73–254, 40 FR 40165, Sept. 2, 1975; may be omitted, provided it can be USCG–2003–16630, 73 FR 65178, Oct. 31, 2008] shown by calculations that the safety of the vessel will not be impaired. § 56.50–45 Circulating pumps. (4) Where the vessel is to carry Class (a) A main circulating pump and 3 flammable liquids with a flashpoint ° ° emergency means for circulating water below 23 C (74 F), Class 6, Division 6.1, through the main condenser shall be poisonous liquids, or Class 8 corrosive ° provided. The emergency means may liquids with a flashpoint below 23 C (74 °F) as defined in 49 CFR part 173, in en- consist of a connection from an inde- closed cargo spaces, the bilge-pumping pendent power pump fitted between the system must be designed to ensure main circulating pump and the con- against inadvertent pumping of such denser. liquids through machinery-space pip- (b) Independent sea suctions shall be ing or pumps. provided for the main circulating and (5) For each vessel constructed on or the emergency circulating pumps. after June 9, 1995, and on an inter- (c) A cross connection between the national voyage, arrangements must be circulating pumps in the case of mul- made to drain the enclosed cargo tiple units will be acceptable in lieu of spaces on either the bulkhead deck of a an independent power pump connec- passenger vessel or the freeboard deck tion. of a cargo vessel. (d) On vessels operating on lakes (in- (i) If the deck edge, at the bulkhead cluding Great Lakes), bays, sounds, or deck of a passenger vessel or the rivers, where provision is made to oper- freeboard deck of a cargo vessel, is im- ate noncondensing, only one circu- mersed when the vessel heels 5° or less, lating unit will be required. the drainage of the enclosed cargo 197 VerDate Mar<15>2010 09:56 Dec 08, 2010 Jkt 220192 PO 00000 Frm 00207 Fmt 8010 Sfmt 8010 Y:\SGML\220192.XXX 220192 jdjones on DSK8KYBLC1PROD with CFR § 56.50–50 46 CFR Ch. I (10–1–10 Edition) spaces must discharge to a space, or easily accessible at all times. As far as spaces, of adequate capacity, each of practicable, each overboard-discharge which has a high-water-level alarm and valve for a bilge system must comply a means to discharge overboard. The with the requirements governing loca- number, size and arrangement of the tion and accessibility for suction mani- drains must prevent unreasonable ac- folds. Except as otherwise permitted by cumulation of water. The pumping ar- paragraph (c)(4) of this section for a rangements must take into account vessel employing a common-rail bilge the requirements for any fixed manual system, each bilge-manifold valve con- or automatic sprinkling system. In en- trolling a bilge suction from any com- closed cargo spaces fitted with carbon- partment must be of the stop-check dioxide extinguishing systems, the type. drains must have traps or other means (2) Each passenger vessel on an inter- to prevent escape of the smothering national voyage must comply with the gas. The enclosed cargo spaces must provisions of SOLAS II–1/21. not drain to machinery spaces or other spaces where sources of ignition may (3) A common-rail bilge system may be present if water may be contami- be installed as an acceptable alter- nated with Class 3 flammable liquids; native to the system required by para- Class 6, Division 6.1, poisonous liquids; graph (c)(1) of this section, provided it or Class 8 corrosive liquids with a satisfies all of the following criteria: flashpoint below 23 °C (74 °F). (i) The common-rail main runs in- (ii) If the deck edge, at the bulkhead board at least one-fifth of the beam of deck of a passenger vessel or the the vessel. freeboard deck of a cargo vessel, is im- (ii) A stop-check valve or both a stop mersed only when the vessel heels valve and a check valve are provided in more than 5°, the drainage of the en- each branch line and located inboard at closed cargo spaces may be by means of least one-fifth of the beam of the ves- a sufficient number of scuppers dis- sel. charging overboard. The installation of (iii) The stop valve or the stop-check scuppers must comply with § 42.15–60 of valve is power-driven, is capable of re- this chapter. mote operation from the space where (b) Passenger vessels shall have pro- the pump is, and, regardless of the sta- vision made to prevent the compart- tus of the power system, is capable of ment served by any bilge suction pip- manual operation to both open and ing from being flooded in the event the close the valve. pipe is severed or otherwise damaged (iv) The stop valve or the stop-check by collision or grounding in any other valve is accessible for both manual op- compartment. Where the piping is lo- eration and repair under all operating cated within one-fifth of the beam of conditions, and the space used for ac- the side of the vessel (measured at cess contains no expansion joint or right angles to the centerline at the flexible coupling that, upon failure, level of the deepest subdivision would cause flooding and prevent ac- loadline or deepest loadline where a subdivision loadline is not assigned) or cess to the valve. is in a ductkeel, a nonreturn valve (v) A port and a starboard suction shall be fitted to the end of the pipe in serve each space protected unless, the compartment which it serves. under the worst conditions of list and (c)(1) Each bilge suction must lead trim and with liquid remaining after from a manifold except as otherwise pumping, the vessel’s stability remains approved by the Commanding Officer, acceptable, in accordance with sub- Marine Safety Center. As far as prac- chapter S of this chapter. ticable, each manifold must be in, or be (vi) For each vessel designed for the capable of remote operation from, the carriage of combinations of both liquid same space as the bilge pump that nor- and dry bulk cargoes (O/B/O), no bilge mally takes suction on that manifold. pump or piping is located in a machin- In either case, the manifold must be ery space other than in a pump room capable of being locally controlled for cargo, and no liquid and other car- from above the floorplates and must be goes are carried simultaneously. 198 VerDate Mar<15>2010 09:56 Dec 08, 2010 Jkt 220192 PO 00000 Frm 00208 Fmt 8010 Sfmt 8010 Y:\SGML\220192.XXX 220192 jdjones on DSK8KYBLC1PROD with CFR Coast Guard, Dept. of Homeland Security § 56.50–50 (vii) For each cargo vessel in Great ured to the next deck above the bulkhead Lakes service, each common-rail pip- deck if an enclosed cargo space on the bulk- ing for the bilge and ballast system head deck that is internally drained in ac- cordance with paragraph (a)(4) of this section serving cargo spaces, if installed and if extends the entire length of the vessel.