Coast Guard, Dept. of Homeland Security Pt. 52

are required, unless specifically ex- 52.01–35 Auxiliary, donkey, fired thermal empted by other regulations in this fluid heater, and heating boilers. subchapter. 52.01–40 Materials and workmanship. (b) The first inspection of Class II 52.01–50 Fusible plugs (modifies A–19 through A–21). welded pressure vessels shall be per- 52.01–55 Increase in maximum allowable formed during the welding of the longi- working pressure. tudinal joint. At this time the marine 52.01–90 Materials (modifies PG–5 through inspector shall check the material and PG–13). fit-up of the work, and ascertain that 52.01–95 Design (modifies PG–16 through only welders who have passed the re- PG–31 and PG–100). 52.01–100 Openings and compensation (modi- quired tests are employed. fies PG–32 through PG–39, PG–42 through (c) A second inspection of Class II PG–55). welded pressure vessels shall be made 52.01–105 Piping, valves and fittings (modi- during the welding of the circumferen- fies PG–58 and PG–59). tial joints. At this time the marine in- 52.01–110 Water-level indicators, water col- spector shall check any new material umns, gauge-glass connections, gauge being used which may not have been cocks, and pressure gauges (modifies PG– examined at the time of the first in- 60). 52.01–115 Feedwater supply (modifies PG– spection, also the fit-up of the vessel at 61). this stage of fabrication, and in addi- 52.01–120 Safety valves and safety relief tion, observe the welding and ascertain valves (modifies PG–67 through PG–73). that only welders who have passed the 52.01–130 Installation. required tests are employed. 52.01–135 Inspection and tests (modifies PG– 90 through PG–100). § 50.30–20 Class III pressure vessels. 52.01–140 Certification by stamping (modi- fies PG–104 through PG–113). (a) Class III pressure vessels shall be 52.01–145 Manufacturers’ data report forms subject to shop inspection at the plant (modifies PG–112 and PG–113). where they are being fabricated, as or when determined necessary by the Offi- Subpart 52.05—Requirements for Boilers cer in Charge, Marine Inspection. The Fabricated by Welding inspection described in this section is 52.05–1 General (modifies PW–1 through PW– required, unless specifically exempted 54). by other regulations in this sub- 52.05–15 Heat treatment (modifies PW–10). chapter. 52.05–20 Radiographic and ultrasonic exam- (b) For Class III welded pressure ves- ination (modifies PW–11 and PW–41.1). sels, one inspection shall be made dur- 52.05–30 Minimum requirements for attach- ing the welding of the longitudinal ment welds (modifies PW–16). 52.05–45 Circumferential joints in pipes, joint. If there is no longitudinal joint, tubes and headers (modifies PW–41). the inspection shall be made during the welding of a circumferential joint. At Subpart 52.15—Requirements for this time the marine inspector shall Watertube Boilers check the material and fit-up of the work and see that only welders who 52.15–1 General (modifies PWT–1 through have passed the required tests are em- PWT–15). 52.15–5 Tube connections (modifies PWT–9 ployed. and PWT–11). PART 51 [RESERVED] Subpart 52.20—Requirements for Firetube Boilers PART 52—POWER BOILERS 52.20–1 General (modifies PFT–1 through PFT–49). Subpart 52.01—General Requirements 52.20–17 Opening between boiler and safety valve (modifies PFT–44). Sec. 52.20–25 Setting (modifies PFT–46). 52.01–1 Incorporation by reference. 52.01–2 Adoption of section I of the ASME Subpart 52.25—Other Boiler Types Boiler and Pressure Vessel Code. 52.01–3 Definitions of terms used in this 52.25–1 General. part. 52.25–3 Feedwater heaters (modifies PFH–1). 52.01–5 Plans. 52.25–5 Miniature boiler (modifies PMB–1 52.01–10 Automatic controls. through PMB–21).

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52.25–7 Electric boilers (modifies PEB–1 (2) 1998 ASME Boiler and Pressure through PEB–19). Vessel Code, Section II, Part A—Fer- 52.25–10 Organic fluid vaporizer generators rous Material Specifications and Part (modifies PVG–1 through PVG–12). B—Nonferrous Material Specifications 52.25–15 Fired thermal fluid heaters. (1998) (‘‘Section II of the ASME Boiler 52.25–20 Exhaust gas boilers. and Pressure Vessel Code’’), 52.01–90. AUTHORITY: 46 U.S.C. 3306, 3307, 3703; E.O. (3) [Reserved] 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; [USCG–2003–16630, 73 FR 65160, Oct. 31, 2008, Department of Homeland Security Delega- as amended by USCG–2009–0702, 74 FR 49228, tion No. 0170.1. Sept. 25, 2009; USCG–2012–0832, 77 FR 59777, SOURCE: CGFR 68–82, 33 FR 18815, Dec. 18, Oct. 1, 2012; USCG–2013–0671, 78 FR 60147, 1968, unless otherwise noted. Sept. 30, 2013] § 52.01–2 Adoption of section I of the Subpart 52.01—General ASME Boiler and Pressure Vessel Requirements Code. (a) Main power boilers and auxiliary § 52.01–1 Incorporation by reference. boilers shall be designed, constructed, (a) Certain material is incorporated inspected, tested, and stamped in ac- by reference into this part with the ap- cordance with section I of the ASME proval of the Director of the Federal Boiler and Pressure Vessel Code (incor- Register under 5 U.S.C. 552(a) and 1 porated by reference; see 46 CFR 52.01– CFR part 51. To enforce any edition 1), as limited, modified, or replaced by other than that specified in this sec- specific requirements in this part. The tion, the Coast Guard must publish no- provisions in the appendix to section I tice of change in the FEDERAL REG- of the ASME Boiler and Pressure Ves- ISTER and the material must be avail- sel Code are adopted and shall be fol- able to the public. All approved mate- lowed when the requirements in sec- rial is available for inspection at the tion I make them mandatory. For gen- National Archives and Records Admin- eral information, table 52.01–1(a) lists istration (NARA). For information on the various paragraphs in section I of the availability of this material at the ASME Boiler and Pressure Vessel NARA, call 202–741–6030 or go to http:// Code that are limited, modified, or re- www.archives.gov/federallregister/ placed by regulations in this part. codeloflfederallregulations/ ibrllocations.html. The material is also TABLE 52.01–1(a)—LIMITATIONS AND MODIFICA- available for inspection at the Coast TIONS IN THE ADOPTION OF SECTION I OF THE Guard Headquarters. Contact Com- ASME CODE mandant (CG–ENG), Attn: Office of De- Paragraphs in section I, ASME Code1 sign and Engineering Systems, U.S. and disposition Unit of this part Coast Guard Stop 7509, 2703 Martin Lu- PG–1 replaced by ...... 54.01–5(a) ther King Jr. Avenue SE., Washington, PG–5 through PG–13 modified by ...... 52.01–90 DC 20593–7509. The material is also PG–16 through PG–31 modified by ...... 52.01–95 available from the sources listed in PG–32 through PG–39 modified by ...... 52.01–100 PG–42 through PG–55 modified by ...... 52.01–100 paragraph (b) of this section. PG–58 and PG–59 modified by ...... 52.01–105 (b) American Society of Mechanical En- PG–60 modified by ...... 52.01–110 gineers (ASME) International, Three PG–61 modified by ...... 52.01–115 (56.50–30) Park Avenue, New York, NY 10016–5990: PG–67 through PG–73 modified by ...... 52.01–120 (1) 2001 ASME Boiler and Pressure PG–90 through PG–100 modified by ...... 52.01–135 Vessel Code, Section I, Rules for Con- (52.01–95) PG–91 modified by ...... 52.01–135(b) struction of Power Boilers (July 1, 2001) PG–99 modified by ...... 52.01–135(c) (‘‘Section I of the ASME Boiler and PG–100 modified by ...... 52.01–95(e) Pressure Vessel Code’’), 52.01–2; 52.01–5; PG–104 through PG–113 modified by ..... 52.01–140(a) 52.01–50; 52.01–90; 52.01–95; 52.01–100; PG–112 and PG–113 modified by ...... 52.01–145 PW–1 through PW–54 modified by ...... 52.05–1 52.01–105; 52.01–110; 52.01–115; 52.01–120; PW–10 modified by ...... 52.05–15 52.01–135; 52.01–140; 52.01–145; 52.05–1; PW–11.1 modified by ...... 52.05–20 52.05–15; 52.05–20; 52.05–30; 52.05–45; 52.15– PW–16 modified by ...... 52.05–30 PW–41 modified by ...... 52.05–20, 52.05– 1; 52.15–5; 52.20–1; 52.20–25; 52.25–3; 52.25– 45 5; 52.25–7; and 52.25–10. PWT–1 through PWT–15 modified by ...... 52.15–1

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TABLE 52.01–1(a)—LIMITATIONS AND MODIFICA- emergency propulsion, for which steam TIONS IN THE ADOPTION OF SECTION I OF THE may be required other than main pro- ASME CODE—Continued pulsion. (3) Watertube boiler. A watertube boil- Paragraphs in section I, ASME Code1 and disposition Unit of this part er is a steam boiler in which the boiler tubes contain water and steam. The PWT–9 modified by ...... 52.15–5 heat is applied to the outside surface of PWT–9.2 replaced by ...... 52.15–5(b) PWT–11 modified by ...... 52.15–5 the tubes. PWT–11.3 replaced by ...... 52.15–5(b) (4) Internally fired firetube boiler PFT–1 through PFT–49 modified by ...... 52.20–1 (scotch boiler). An internally fired PFT–44 modified by ...... 52.20–17 firetube boiler is a steam boiler con- PFT–46. modified by ...... 52.20–25 PFH–1 modified by ...... 52.25–3 taining furnaces, one or more combus- PMB–1 through PMB–21 modified by ...... 52.25–5 tion chambers and tubes or flues, PEB–1 through PEB–19 modified by ...... 52.25–7 which are surrounded by water and PVG–1 through PVG–12 modified by ...... 52.25–10 through which the products of combus- A–19 through A–21 modified by ...... 52.01–50 tion pass from the furnace to the up- 1 The references to specific provisions in the ASME Code are coded. The first letter ‘‘P’’ refers to section I, while the let- take. In such boilers no part of the ter ‘‘A’’ refers to the appendix to section I. The letter or letters shell is in contact with the fire or prod- following ‘‘P’’ refer to a specific subsection of section I. The number following the letter or letters refers to the paragraph ucts of combustion. so numbered in the text. (5) Externally fired firetube or flue boil- (b) References to the ASME Code, er (horizontal return tubular). An exter- such as paragraph PG–1, indicate: nally fired firetube or flue boiler is a steam boiler, part of the outer shell of P = Section I, Power Boilers ASME Code. which is exposed to fire or to the prod- G = Subsection—General. ucts of combustion, and containing 1 = Paragraph 1. flues through which such products pass (c) When a section or paragraph of from the furnace to the uptake. the regulations in this part relates to (6) High temperature water boiler. A material in section I of the ASME high temperature water boiler is a boil- Code, the relationship with the code er containing water at a temperature will be shown immediately following exceeding 250 °F. the heading of the section or at the be- (7) Packaged boiler. A packaged boiler ginning of the paragraph as follows: is a steam boiler equipped, and shipped (1) (Modifies P lll.) This indicates complete with fuel burning equipment, that the material in P lll is gen- mechanical draft equipment, feed erally applicable but is being altered, water apparatus and all necessary con- amplified or augmented. trols for manual or automatic oper- (2) (Replaces P lll.) This indicates ation, all completely mounted on a that P lll does not apply. common base and requiring only to be (3) (Reproduces P lll.) This indi- connected to fuel, water and electric cates that P lll is being identically supplies to be ready for use. reproduced for convenience, not for (8) Fired steam boiler. A pressure ves- emphasis. sel in which steam is generated by the application of heat resulting from the [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as combustion of fuel is classed as a fired amended by CGFR 69–127, 35 FR 9975, June 17, 1970; CGD 81–79, 50 FR 9431, Mar. 8, 1985. Re- steam boiler. designated and amended by CGD 88–032, 56 (9) Unfired steam boiler. A pressure FR 35821, July 29, 1991; USCG–2003–16630, 73 vessel in which steam is generated by FR 65160, Oct. 31, 2008] means other than fuel combustion is classed as an unfired steam boiler. (See § 52.01–3 Definitions of terms used in § 54.01–10 of this subchapter.) this part. (10) Hybrid boiler. A hybrid boiler is a (a) Types of boilers—(1) Main power steam boiler whose design employs fea- boiler. A main power boiler is a steam tures from both watertube and firetube boiler used for generating steam for boilers. main propulsion. (b) Parts of boilers—(1) Shell. The shell (2) Auxiliary or donkey boiler. An aux- is the structure forming the outer en- iliary or donkey boiler is a steam boil- velope of a boiler drum, or pressure er used for all purposes, including vessel consisting of one or more plates

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properly joined (or of seamless con- tions joined by means of riveting or struction) as specified in this part. welding. This does not include tube sheets or (10) Combustion chamber. A combus- heads. tion chamber is that part of an inter- (2) Heads. The heads are the ends of a nally fired boiler in which combustible boiler or pressure vessel. They may be gases may be burned after leaving the flat or dished, stayed or unstayed. furnace. (i) Dished heads. Dished heads are (i) Separate combustion chamber. A heads formed to a segment of a sphere separate combustion chamber is a com- or to a hemispherical or elliptical sec- bustion chamber which is connected to tion and may be attached to the shell one furnace only. so that the pressure will be either on (ii) Common combustion chamber. A the concave or on the convex side. common combustion chamber is a com- (ii) Stayed heads. Stayed heads are bustion chamber connected to two or heads supported in whole or in part by more furnaces in a boiler. stays, furnaces, flues, tubes, etc. (iii) Crown or top plate. A crown or (3) Water wall. A water wall is a series top plate is the top of a combustion of tubes or elements spaced along or in- chamber and is usually supported by tegral with a wall of a furnace to pro- girder stays or by sling stays or braces. tect the wall and provide additional (iv) Curved bottom plate. A curved bot- heating surface. tom plate is the bottom of a separate (4) A header is a hollow forg- Header. combustion chamber formed to an arc ing, pipe, or welded plate of cylin- of a circle and usually designed to be drical, square, or rectangular cross sec- self-supporting. tion, serving as a manifold to which (v) Combustion chamber tube sheet. A tubes are connected. combustion chamber tube sheet is the (5) Superheater. A superheater is an plate forming the end of a combustion appliance for the purpose of increasing chamber in which the tubes are se- the temperature of steam. cured. (6) Economizer. An economizer is a feed-water heater usually located in (vi) Combustion chamber back sheet. A the uptake or casing of a boiler to ab- combustion chamber back sheet is the sorb heat from the waste gases. plate opposite the tube sheet forming (7) Domes. Domes are superstructures the back of the combustion chamber. It of shells, attached by riveting, bolting, is usually stayed to the back head of or welding. They generally consist of a the boiler by means of screw staybolts, cylindrical shell with one end flanged or, in the case of double-ended boilers, for attachment to the main shell and to the back of the combustion chamber the other end closed by a head which of the other end of the boiler. may be integral with, riveted, or weld- (11) Flues. Flues are cylindrical shells ed to the shell. made of seamless or welded tubing, or (8) Steam chimneys. Steam chimneys with a riveted longitudinal joint, the are superstructures of steam boilers ends being attached by riveting or which are fitted with a lining inside of welding. Their purpose is to provide ad- which the products of combustion pass ditional heating surface and to form a to the smokestack. They may be con- path for the products of combustion. structed in the form of a dome integral (12) Tubes. Tubes are cylindrical with the boiler or as independent shells of comparatively small diameter steam vessels connected by piping to constituting the main part of the heat- the boiler. ing surface of a boiler or superheater. (9) Furnace. A furnace is a firebox or (i) Seamless tube. A seamless tube is a a large flue in which the fuel is burned. tube without any longitudinal joint. (i) Corrugated furnace. A corrugated (ii) Electric-resistance-welded tube. An furnace is a cylindrical shell wherein electric-resistance-welded tube is a corrugations are formed circumferen- tube the longitudinal joint of which is tially for additional strength and to made by the electric-resistance butt provide for expansion. welding process. (ii) Plain furnace. A plain furnace is a (iii) Stay tube. A stay tube is a cylindrical shell usually made in sec- thickwalled tube, the end of which is

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usually thickened by upsetting to com- (6) Flexible staybolt. A flexible pensate for threading. Such tubes are staybolt is a bar made with ball-and- used for staying tube sheets into which socket joint on one end, the cup of the they are screwed and expanded. socket being screwed into the outside (13) Tube sheet. A tube sheet is a por- sheet and covered with a removable tion of a boiler drum, or header per- cap, the plain end of the staybolt being forated for the insertion of tubes. threaded, screwed through the inside (14) Ligament. The ligament is the sheet and riveted over. (See Figure section of metal between the holes in a 52.01–3(d).) tube sheet. (7) Sling stay. A sling stay is a flexible (i) Longitudinal ligament. A longitu- stay consisting of a solid bar having dinal ligament is the minimum section one or both ends forged for a pin con- of metal between two tube holes on a nection to a crowfoot or other struc- line parallel with the axis of the drum. tural fitting secured to the stayed plate. (See Figure 52.01–3(e).) (ii) Circumferential ligament. A cir- (8) Crowfoot. A crowfoot is a forged cumferential ligament is the minimum fitting with palms or lugs secured to section of metal between two tube the head to form a proper connection holes on a line around the circum- with a sling stay. (See Figure 52.01– ference of the drum. 3(f).) (iii) Diagonal ligament. A diagonal lig- (9) Crowfoot stay. A crowfoot stay is a ament is the minimum section of solid bar stay terminating in a forged metal between two tube holes in adja- fork with palms or lugs for attachment cent rows, measured diagonally from to the plate. (See Figure 52.01–3(g).) one row to the other. (10) Diagonal stay. A diagonal stay is (c) Stays and supports—(1) Surfaces to a bar or formed plate forged with palms be stayed. Surfaces to be stayed or rein- or lugs for staying the head of the boil- forced include flat plates, heads, or er to the shell diagonally. (See Figure areas thereof, such as segments of 52.01–3(h).) heads, wrapper sheets, furnace plates, (11) Gusset stay. A gusset stay is a tri- side sheets, combustion chamber tops, angular plate used for the same pur- etc., which are not self-supporting; and pose as a diagonal stay and attached to curved plates, constituting the whole the head and the shell by angles, or parts of a cylinder subject to exter- flanges, or other suitable means of at- nal pressure, which are not entirely tachment. (See Figure 52.01–3(i).) self-supporting. (12) Dog stay. A dog stay is a staybolt, (2) Through stay. A through stay is a one end of which extends through a solid bar extending through both heads girder, dog, or bridge, and is secured by of a boiler and threaded at the ends for a nut, the other end being screwed attachment by means of nuts. With through the plate which it is sup- this type of stay the ends are usually porting and riveted over or fitted with upset to compensate for the threading. a nut or welded collar. (See Figure (See Figure 52.01–3(a).) 52.01–3(j).) (3) Solid screw staybolt. A solid screw (13) Girder. A girder is a bridge, built staybolt is a threaded bar screwed up of plates of structural shapes sepa- through the plates, the ends being riv- rated by distance pieces, a forging, or a eted over or fitted with nuts or welded formed plate, which spans an area re- collars. (See Figure 52.01–3(b).) quiring support, abutting thereon and (4) Welded collar. A welded collar is a supporting the girder stays or beveled ring formed around the end of staybolts. (See Figure 52.01–3(k).) a screw stay by means of arc- or gas- (14) Structural stiffeners. Structural welding. It is used in lieu of a nut. (See stiffeners are rolled shapes or flanged Figure 52.01–3(1).) plates which are used to stiffen a sur- (5) Hollow screw staybolt. A hollow face which is not entirely self-sup- screw staybolt is a hollow threaded bar porting. screwed through the plate, the ends (15) Reinforcement. A reinforcement is being riveted over or fitted with nuts a doubling plate, washer, structural or welded collars. (See Figure 52.01– shape, or other form for stiffening or 3(c).) strengthening a plate.

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(d) Pressure relief devices. For boilers, or by opening in proportion to the in- pressure vessels, and pressure piping, a crease in pressure over the opening pressure relief device is designed to pressure, depending on application. open to prevent a rise of internal fluid (A) Conventional safety relief valve. A pressure in excess of a specified value conventional safety relief valve has its due to exposure to emergency or abnor- spring housing vented to the discharge mal conditions. It may also be designed side of the valve. The performance to prevent excessive internal vacuum. characteristics (opening pressure, clos- It may be a pressure relief valve, a ing pressure, lift and relieving capac- nonreclosing pressure relief device or a ity) are directly affected by changes of vacuum relief valve. the back pressure on the valve. (1) Pressure relief valve. A pressure re- (B) Balanced safety relief valve. A bal- lief valve is a pressure relief device anced safety relief valve incorporates which is designed to reclose and pre- means of minimizing the effect of back vent the further flow of fluid after nor- pressure on the operational character- mal conditions have been restored. istics (opening pressure, closing pres- (i) Safety valve. A safety valve is a sure, lift and relieving capacity). pressure relief valve actuated by inlet (C) Internal spring safety relief valve. static pressure and characterized by An internal spring safety relief valve rapid opening or pop action. Examples incorporates the spring and all or part of types used on boilers include: of the operating mechanism within the (A) Spring-loaded safety valve. A pressure vessel. spring-loaded safety valve is a safety (iv) Pilot operated pressure relief valve. valve fitted with a spring which nor- A pilot operated pressure relief valve is mally holds the valve disk in a closed a pressure relief valve in which the position against the seat and allows it major relieving device is combined to open or close at predetermined pres- with and is controlled by a self-actu- sures. Spring-loaded safety valves are ated auxiliary pressure relief valve. characterized by pop action. (v) A (B) Pressure loaded pilot actuated safe- Power actuated relief valve. power actuated pressure relief valve is ty valve. A pressure loaded pilot actu- ated safety valve is one which is held a pressure relief valve in which the in a closed position by steam pressure major relieving device is combined and controlled in operation by a pilot with and controlled by a device requir- actuator valve. ing an external source of energy. (C) Spring loaded pilot actuated safety (vi) Temperature actuated pressure re- valve. A spring loaded, pilot actuated lief valve. A temperature actuated pres- safety valve is one in which a spring is sure relief valve is a pressure relief used in the conventional way to hold valve. A spring loaded, pilot actuated the disk against the seat, but which internal temperature. has a piston attached to the spindle (2) Nonreclosing pressure relief device. and enclosed within a cylinder, which A nonreclosing pressure relief device is when subjected to a limiting or set a pressure relief device not designed to pressure, unbalances the spring load reclose after operation. thereby opening the valve. (i) Rupture disk device. A rupture disk (D) Spring loaded pilot valve. A spring device is a device actuated by inlet loaded pilot valve is a conventional static pressure and designed to func- safety valve designed to actuate an- tion by the bursting of a pressure re- other spring loaded safety valve taining disk. through a pressure transmitting line (ii) Explosion rupture disk device. An led from the body of the pilot valve. explosion rupture disk device is a rup- (ii) Relief valve. A relief valve is a ture disk device designed for use at pressure relief valve actuated by inlet high rates of pressure rise. static pressure which opens in propor- (iii) Breaking pin device. A breaking tion to the increase in pressure over pin device is a device actuated by inlet the opening pressure. static pressure and designed to func- (iii) Safety relief valve. A safety relief tion by the breakage of a load carrying valve is a pressure relief valve charac- section of a pin which supports a pres- terized by rapid opening or pop action, sure retaining member.

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(iv) Shear pin device. A shear pin de- the purpose of drawing off a sample of vice is a device actuated by inlet static water for salinity tests. pressure and designed to function by (11) Fusible plugs. Fusible plugs are the shearing of a load carrying pin plugs made with a bronze casing and a which supports the pressure retaining tin filling which melts at a tempera- member. ture of 445° to 450 °F. They are intended (v) Fusible plug device. A fusible plug to melt in the event of low water and device is a device designed to function thus warn the engineer on watch. by the yielding or melting of a plug of (f) Boiler fabrication—(1) Repair. Re- suitable melting temperature. pair is the restoration of any damaged (vi) Frangible disk device. A frangible or impaired part to an effective and disk device is the same as a rupture safe condition. disk device. (2) Alteration. Alteration is a struc- (vii) Bursting disk device. A bursting tural modification to or departure from disk device is the same as a rupture an approved design or existing con- disk device. struction. (3) Vacuum relief valve. A vacuum re- lief valve is a valve designed to admit (3) Expanding. Expanding is the proc- fluid to prevent an excessive internal ess of enlarging the end of a tube to vacuum. make it fit tightly in the tube sheet. (e) Other boiler attachments—(1) (4) Beading. Beading is the process of Mountings. Mountings are nozzle con- turning over the protruding end of a nections, distance pieces, valves, or fit- tube after expanding to form a sup- tings attached directly to the boiler. porting collar for the tube sheet. (2) Main steam stop valve. A main (5) Bell-mouthing. Bell-mouthing is steam stop valve is a valve usually con- the process of flaring the end of a tube nected directly to the boiler for the beyond where it is expanded in the tube purpose of shutting off the steam from sheet. the main steam line. (6) Telltale hole. A telltale hole is a (3) Auxiliary steam stop valve. An aux- small hole having a diameter not less iliary steam stop valve is a valve usu- than three-sixteenths inch drilled in ally connected directly to the boiler the center of a solid stay, and extend- for the purpose of shutting off the ing to at least one-half inch beyond the steam from the auxiliary lines (includ- inside surface of the sheet. ing the whistle lines). (7) Access or inspection openings. Ac- (4) Manifold. A manifold is a fitting cess or inspection openings are holes with two or more branches having cut in the shells or heads of boilers or valves either attached by bolting or in- boiler pressure part for the purpose of tegral with the fitting. inspection and cleaning. (5) A feed valve is a valve Feed valve. (8) Openings. Openings are holes cut in the feed-water line which controls in shells or heads of boilers or boiler the boiler feed. pressure parts for the purpose of con- (6) Blowoff valve. A blowoff valve is a necting nozzles, domes, steam chim- valve connected directly to the boiler neys, or mountings. for the purpose of blowing out water, scum or sediment. (g) Pressure. The term pressure is an (7) Dry pipe. A dry pipe is a per- abbreviation of the more explicit ex- forated or slotted pipe placed in the pression ‘‘difference in pressure inten- highest part of the steam space of a sity.’’ It is measured in terms such as boiler to prevent priming. pounds per square inch (p.s.i.). (8) Water column. A water column is a (1) Gage (or gauge) pressure. Gage fitting or tube equipped with a water pressure is the difference between the glass attached to a boiler for the pur- pressure at the point being measured pose of indicating the water level. and the ambient pressure for the gage. (9) Test cocks. Test cocks are small It is measured in units such as pounds cocks on a boiler for indicating the per square inch gage (p.s.i.g.). water level. (2) Absolute pressure. Absolute pres- (10) Salinometer cocks. Salinometer sure is the difference between the pres- cocks are cocks attached to a boiler for sure at the point being measured and

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that of a perfect vacuum. It is meas- (4) External pressure. External pres- ured in units such as pounds per square sure refers to a situation where the inch absolute (p.s.i.a.). pressure outside exceeds that inside (3) Internal pressure. Internal pressure the volume being described. refers to a situation where the pressure (5) Maximum allowable working pres- inside exceeds that outside the volume sure. For a definition of maximum al- being described. lowable working pressure, see § 54.10–5 of this subchapter.

FIGURE 52.01–3—ACCEPTABLE TYPES OF BOILER STAYS

[CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as § 52.01–5 Plans. amended by CGFR 69–127, 35 FR 9976, June 17, 1970; CGD 81–79, 50 FR 9431, Mar. 8, 1985; CGD (a) Manufacturers intending to fab- 83–043, 60 FR 24772, May 10, 1995] ricate boilers to be installed on vessels shall submit detailed plans as required by subpart 50.20 of this subchapter. The

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plans, including design calculations, for miscellaneous boiler types, such as must be certified by a registered pro- donkey, fired thermal fluid heater, fessional engineer as meeting the de- heating boiler, etc., may be found, refer sign requirements in this part and in to table 54.01–5(a) of this subchapter. section I of the ASME Boiler and Pres- (b) Fired vessels in which steam is sure Vessel Code (incorporated by ref- generated at pressures exceeding 103 erence; see 46 CFR 52.01–1). kPa gage (15 psig) shall meet the re- (b) The following information must quirements of this part. be included: [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as (1) Calculations for all pressure con- amended by CGD 81–79, 50 FR 9432, Mar. 8, tainment components including the 1985] maximum allowable working pressure and temperature, the hydrostatic or § 52.01–40 Materials and workmanship. pneumatic test pressure, the maximum All materials to be used in any of the steam generating capacity and the in- work specified in the various sections tended safety valve settings. of this part shall be free from injurious (2) Joint design and methods of at- defects and shall have a workmanlike tachment of all pressure containment finish. The construction work shall be components. executed in a workmanlike manner (3) A bill of material meeting the re- with proper tools or equipment and quirements of section I of the ASME shall be free from defects which would Code, as modified by this subpart. impair strength or durability. (4) A diagrammatic arrangement drawing of the assembled unit indi- § 52.01–50 Fusible plugs (modifies A–19 cating the location of internal and ex- through A–21). ternal components including any inter- (a) All boilers, except watertube boil- connecting piping. ers, with a maximum allowable work- (Approved by the Office of Management and ing pressure in excess of 206 kPa gauge Budget under control number 1625–0097) (30 psig), if fired with solid fuel not in [CGD 81–79, 50 FR 9432, Mar. 8, 1985, as suspension, or if not equipped for unat- amended by USCG–2006–25697, 71 FR 55746, tended waterbed operation, must be Sept. 25, 2006; USCG–2003–16630, 73 FR 65160, fitted with fusible plugs. Fusible plugs Oct. 31, 2008] must comply with only the require- ments of A19 and A20 of section I of the § 52.01–10 Automatic controls. ASME Boiler and Pressure Vessel Code (a) Each main boiler must meet the (incorporated by reference; see 46 CFR special requirements for automatic 52.01–1) and be stamped on the casing safety controls in § 62.35–20(a)(1) of this with the name of the manufacturer, chapter. and on the water end of the fusible (b) Each automatically controlled metal ‘‘ASME Std.’’ Fusible plugs are auxiliary boiler having a heat input not permitted where the maximum rating of less than 12,500,000 Btu/hr. steam temperature to which they are (3.66 megawatts) must meet the re- exposed exceeds 218 °C (425 °F). quirements of part 63 of this chapter. (b) Vertical boilers shall be fitted (c) Each automatically controlled with one fusible plug located in a tube auxiliary boiler with a heat input rat- not more than 2 inches below the low- ing of 12,500,000 Btu/hr. (3.66 est gage cock. megawatts) or above, must meet the (c) Externally fired cylindrical boil- requirements for automatic safety con- ers with flues shall have one plug fitted trols in part 62 of this chapter. to the shell immediately below the fire [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as line not less than 4 feet from the front amended by CGD 81–030, 53 FR 17837, May 18, end. 1988; CGD 88–057, 55 FR 24236, June 15, 1990] (d) Firebox, Scotch, and other types of shell boilers not specifically pro- § 52.01–35 Auxiliary, donkey, fired vided for, having a combustion cham- thermal fluid heater, and heating ber common to all furnaces, shall have boilers. one plug fitted at or near the center of (a) To determine the appropriate part the crown sheet of the combustion of the regulations where requirements chamber.

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(e) Double-ended boilers, having indi- shall contain the following informa- vidual combustion chambers for each tion: end, in which combustion chambers are (i) Name and official number of ves- common to all the furnaces in one end sel. of the boiler, shall have one plug fitted (ii) Date of renewal of fusible plugs. at or near the center of the crown (iii) Number and location of fusible sheet of each combustion chamber. plugs renewed in each boiler. (f) Boilers constructed with a sepa- (iv) Manufacturer and heat number of rate combustion chamber for each indi- each plug. vidual furnace shall be fitted with a fu- (v) Reason for renewal. sible plug in the center of the crown [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as sheet of each combustion chamber. amended by CGD 81–79, 50 FR 9432, Mar. 8, (g) Boilers of types not provided for 1985; USCG–1999–4976, 65 FR 6500, Feb. 9, 2000; in this section shall be fitted with at USCG–2003–16630, 73 FR 65160, Oct. 31, 2008] least one fusible plug of such dimen- sions and located in a part of the boiler § 52.01–55 Increase in maximum allow- able working pressure. as will best meet the purposes for which it is intended. (a) When the maximum allowable (h) Fusible plugs shall be so fitted working pressure of a boiler has been that the smaller end of the filling is in established, an increase in the pressure direct contact with the radiant heat of settings of its safety valves shall not the fire, and shall be at least 1 inch be granted unless the boiler design higher on the water side than the plate meets the requirements of this sub- or flue in which they are fitted, and in chapter in effect at the time the boiler no case more than 1 inch below the was contracted for or built; but in no lowest permissible water level. case will a pressure increase be author- (i) The lowest permissible water level ized for boilers constructed prior to the shall be determined as follows: effective date of the regulations dated November 19, 1952, if the minimum (1) Vertical firetube boilers, one-half thickness found by measurement shows of the length of the tubes above the that the boiler will have a factor of lower tube sheets. safety of less than 41⁄2. The piping sys- (2) Vertical submerged tube boilers 1 tem, machinery, and appurtenances inch above the upper tube sheet. shall meet the present requirements of (3) Internally fired firetube boilers this subchapter for the maximum al- with combustion chambers integral lowable working pressure requested. with the boiler, 2 inches above the An increase in pressure shall be grant- highest part of the combustion cham- ed only by the Commandant upon pres- ber. entation of data or plans proving that (4) Horizontal-return tubular and dry the requested increase in pressure is back Scotch boilers, 2 inches above the justified. top row of tubes. (b) When an existing boiler is re- (j) [Reserved] placed by a new boiler designed to op- (k)(1) Fusible plugs shall be cleaned erate at pressures in excess of the pres- and will be examined by the marine in- sure indicated on the certificate of in- spector at each inspection for certifi- spection for the previous boiler, an cation, periodic inspection, and oftener analysis of the complete system shall if necessary. If in the marine inspec- be made, including machinery and pip- tor’s opinion the condition of any plug ing, to insure its compatibility with is satisfactory, it may be continued in the increased steam pressure. The max- use. imum allowable working pressure on (2) When fusible plugs are renewed at the certificate of inspection shall be other than the inspection for certifi- based on the results of this analysis. cation and no marine inspector is in at- tendance, the Chief Engineer shall sub- § 52.01–90 Materials (modifies PG–5 mit a written report to the Officer in through PG–13). Charge, Marine Inspection, who issued (a) Material subject to stress due to the certificate of inspection informing pressure must conform to specifica- him of the renewal. This letter report tions as indicated in paragraphs PG–5

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through PG–13 of section I of the provided in any installation in which ASME Boiler and Pressure Vessel Code the superheater outlet temperature ex- (incorporated by reference; see 46 CFR ceeds 454 °C (850 °F). The setting of the 52.01–1) except as noted otherwise in excessive superheat alarms must not this section. exceed the maximum allowable tem- (b) Material not fully identified with perature of the superheater outlet, an ASME Boiler and Pressure Vessel which may be limited by the boiler de- Code-approved specification may be ac- sign, the main steam piping design, or cepted as meeting Coast Guard require- the temperature limits of other equip- ments providing it satisfies the condi- ment subjected to the temperature of tions indicated in paragraph PG–10 of section I of the ASME Boiler and Pres- the steam. sure Vessel Code. (3) Arrangement shall be made for (c) (Modifies PG–5.) When the max- venting and draining the superheater imum allowable working pressure (See in order to permit steam circulation PG–21) exceeds 15 pounds per square through the superheater when starting inch, cross pipes connecting the steam the boiler. and water drums of water tube boilers, (c) Economizer. The design pressure of headers, cross boxes, and all pressure an economizer integral with the boiler parts of the boiler proper, shall be and connected to the boiler drum with- made of a wrought or cast steel listed out intervening stop valves shall be at in tables 1A and 1B of section II of the least equal to 110 percent of the highest ASME Boiler and Pressure Vessel Code setting of the safety valves on the (incorporated by reference; see 46 CFR drum. 52.01–1). (d) Brazed boiler steam air heaters. (d) (Modifies PG–8.2.) The use of cast Boiler steam air heaters utilizing iron is prohibited for mountings, fit- tings, valves, or cocks attached di- brazed construction are permitted at ° rectly to boilers operating at pressures temperature not exceeding 525 F. exceeding 15 pounds per square inch. Refer to § 56.30–30(b)(1) of this sub- chapter for applicable requirements. [USCG–2003–16630, 73 FR 65161, Oct. 31, 2008] (e) Stresses. (Modifies PG–22.) The § 52.01–95 Design (modifies PG–16 stresses due to hydrostatic head shall through PG–31 and PG–100). be taken into account in determining the minimum thickness of the shell or (a) Requirements. Boilers required to be designed to this part shall meet the head of any boiler pressure part unless requirements of PG–16 through PG–31 noted otherwise. Additional stresses, of section I of the ASME Boiler and imposed by effects other than internal Pressure Vessel Code (incorporated by pressure or static head, which increase reference; see 46 CFR 52.01–1) except as the average stress over substantial sec- noted otherwise in this section. tions of the shell or head by more than (b) Superheater. (1) The design pres- 10 percent of the allowable stress shall sure of a superheater integral with the be taken into account. These effects in- boiler shall not be less than the lowest clude the weight of the vessel and its setting of the drum safety valve. contents, method of support, impact (2) Controls shall be provided to in- loads, superimposed loads, localized sure that the maximum temperature at stresses due to the reactions of sup- the superheater outlets does not exceed ports, stresses due to temperature gra- the allowable temperature limit of the dients and dynamic effects. material used in the superheater out- (f) Cylindrical components under inter- let, in the steam piping, and in the as- nal pressure. (Modifies PG–27.) The min- sociated machinery under all operating imum required thickness and max- conditions including boiler overload. imum allowable working pressure of Controls need not be provided if the op- boiler piping, tubes, drums and headers erating superheater characteristic is shall be as required by the formula in demonstrated to be such that the tem- perature limits of the material will not PG–27 of section I of the ASME Boiler be exceeded. Visible and audible alarms and Pressure Vessel Code except that indicating excessive superheat shall be

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threaded boiler tubes are not per- (1) Meet the design conditions and mitted. criteria in § 56.07–10 of this subchapter, except § 56.07–10(b); [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as amended by CGD 81–79, 50 FR 9432, Mar. 8, (2) Be included in the pipe stress cal- 1985; USCG–2003–16630, 73 FR 65161, Oct. 31, culations required by § 56.35–1 of this 2008] subchapter; (3) Meet the nondestructive examina- § 52.01–100 Openings and compensa- tion requirements in § 56.95–10 of this tion (modifies PG–32 through PG– subchapter; 39, PG–42 through PG–55). (4) Have butt welding flanges and fit- (a) The rules for openings and com- tings when full radiography is required; pensation shall be as indicated in PG– and 32 through PG–55 of section I of the (5) Meet the requirements for thread- ASME Boiler and Pressure Vessel Code ed joints in § 56.30–20 of this subchapter. (incorporated by reference; see 46 CFR (c) Steam stop valves, in sizes ex- 52.01–1) except as noted otherwise in ceeding 152mm (6 inch) NPS, must be this section. fitted with bypasses for heating the (b) (Modifies PG–39.) Pipe and nozzle line and equalizing the pressure before necks shall be attached to vessel walls the valve is opened. as indicated in PG–39 of section I of the (d) Feed connections. (1) Feed water ASME Boiler and Pressure Vessel Code shall not be discharged into a boiler except that threaded connections shall against surfaces exposed to hot gases not be used under any of the following or radiant heat of the fire. conditions: (2) Feed water nozzles of boilers de- (1) Pressures greater than 4,137 kPa signed for pressures of 2758 kPa (400 (600 psig); psi), or over, shall be fitted with (2) Nominal diameters greater than sleeves or other suitable means em- 51 mm (2 in.); or ployed to reduce the effects of metal (3) Nominal diameters greater than temperature differentials. 19 mm (0.75 in.) and pressures above (e) Blowoff connections. (1) Firetube 1,034 kPa (150 psig). and drum type boilers shall be fitted (c) (Modifies PG–42.) Butt welding with a surface and a bottom blowoff flanges and fittings must be used when valve or cock attached directly to the full radiography is required by § 56.95– boiler or to a short distance piece. The 10. surface blowoff valve shall be located [CGD 81–79, 50 FR 9432, Mar. 8, 1985, as within the permissible range of the amended by USCG–2003–16630, 73 FR 65161, water level, or fitted with a scum pan Oct. 31, 2008] or pipe at this level. The bottom blow- off valve shall be attached to the low- § 52.01–105 Piping, valves and fittings est part of the boiler or fitted with an (modifies PG–58 and PG–59). internal pipe leading to the lowest (a) Boiler external piping within the point inside the boiler. Watertube boil- jurisdiction of the ASME Boiler and ers designed for pressures of 2413 kPa Pressure Vessel Code must be as indi- (350 psig) or over are not required to be cated in PG–58 and PG–59 of section I of fitted with a surface blowoff valve. the ASME Boiler and Pressure Vessel Boilers equipped with a continuous Code (incorporated by reference; see 46 blowdown valve on the steam drum are CFR 52.01–1) except as noted otherwise not required to be fitted with an addi- in this section. Piping outside the ju- tional surface blowoff connection. risdiction of the ASME Boiler and (2) Where blowoff pipes are exposed Pressure Vessel Code must meet the to radiant heat of the fire, they must appropriate requirements of part 56 of be protected by fire brick or other suit- this subchapter. able heat-resisting material. (b) In addition to the requirements in (f) Dry pipes. Internal dry pipes may PG–58 and PG–59 of section I of the be fitted to the steam drum outlet pro- ASME Boiler and Pressure Vessel Code, vided the dry pipes have a diameter boiler external piping must: equal to the steam drum outlet and a

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wall thickness at least equal to stand- section except that float gages may be ard commercial pipe of the same di- substituted for gage glasses. ameter. Openings in dry pipes must be (c) Water columns. (Modifies PG–60.2.) as near as practicable to the drum out- The use of water columns is generally let and must be slotted or drilled. The limited to firetube boilers. Water col- width of the slots must not be less than umn installations shall be close hauled 6mm (0.25 in.). The diameter of the to minimize the effect of ship motion holes must not be less than 10mm (0.375 on water level indication. When water in.). Where dry pipes are used, they columns are provided they shall be must be provided with drains at each fitted directly to the heads or shells of end to prevent an accumulation of boilers or drums by 1 inch minimum water. size pipes with shutoff valves attached directly to the boiler or drums, or if [CGD 81–79, 50 FR 9432, Mar. 8, 1985, as amended by USCG–2003–16630, 73 FR 65161, necessary, connected thereto by a dis- Oct. 31, 2008] tance piece both at the top and bottom of the water columns. Shutoff valves § 52.01–110 Water-level indicators, used in the pipe connections between water columns, gauge-glass connec- the boiler and water column or be- tions, gauge cocks, and pressure tween the boiler and the shutoff valves, gauges (modifies PG–60). required by PG–60.6 of section I of the (a) Boiler water level devices. Boiler ASME Boiler and Pressure Vessel Code water level devices shall be as indi- for gauge glasses, shall be locked or cated in PG–60 of section I of the sealed open. Water column piping shall ASME Boiler and Pressure Vessel Code not be fitted inside the uptake, the (incorporated by reference; see 46 CFR smoke box, or the casing. Water col- 52.01–1) except as noted otherwise in umns shall be fitted with suitable this section. drains. Cast iron fittings are not per- (b) Water level indicators. (Modifies mitted. PG–60.1.) (1) Each boiler, except those (d) Gage glass connections. (Modifies of the forced circulation type with no PG–60.3.) Gage glasses and gage cocks fixed water line and steam line, shall shall be connected directly to the head have two independent means of indi- or shell of a boiler as indicated in para- cating the water level in the boiler graph (b)(1) of this section. When water connected directly to the head or shell. columns are authorized, connections to One shall be a gage lighted by the the columns may be made provided a emergency electrical system (See sub- close hauled arrangement is utilized so part 112.15 of subchapter J (Electrical that the effect of ship roll on the water Engineering) of this chapter) which level indication is minimized. will insure illumination of the gages (e) Gage cocks. (Modifies PG–60.4.) (1) under all normal and emergency condi- When the steam pressure does not ex- tions. The secondary indicator may ceed 250 pounds per square inch, three consist of a gage glass, or other accept- test cocks attached directly to the able device. Where the allowance pres- head or shell of a boiler may serve as sure exceeds 1724 kPa (250 psi), the gage the secondary water level indicator. glasses shall be of the flat type instead (2) See paragraph (d) of this section of the common tubular type. for restrictions on cock connections. (2) Gage glasses shall be in contin- (f) Pressure gages. (Modifies PG–60.6.) uous operation while the boiler is Each double-ended boiler shall be fitted steaming. with two steam gages, one on either (3) Double-ended firetube boilers end on the boiler. shall be equipped as specified in this (g) Salinometer cocks. In vessels oper- paragraph and paragraph (e) of this ating in salt water, each boiler shall be section except that the required water equipped with a salinometer cock or level indicators shall be installed on valve which shall be fitted directly to each end of the boiler. the boiler in a convenient position. (4) Externally fired flue boilers, such They shall not be attached to the as are used on central western river water gage or water column. vessels, shall be equipped as specified (h) High-water-level alarm. Each in paragraphs (b) (1) through (3) of this watertube boiler for propulsion must

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have an audible and a visible high- (5) In the event the maximum steam water-level alarm. The alarm indica- generating capacity of the boiler is in- tors must be located where the boiler is creased by any means, the relieving ca- controlled. pacity of the safety valves shall be checked by an inspector, and, if deter- [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as amended by CGD 81–79, 50 FR 9433, Mar. 8, mined to be necessary, valves of in- 1985; CGD 83–043, 60 FR 24772, May 10, 1995; creased relieving capacity shall be in- USCG–2003–16630, 73 FR 65161, Oct. 31, 2008] stalled. (6) (Modifies PG–67.) Drum safety § 52.01–115 Feedwater supply (modifies valves shall be set to relieve at a pres- PG–61). sure not in excess of that allowed by Boiler feedwater supply must meet the Certificate of Inspection. Where for the requirements of PG–61 of section I any reason this is lower than the pres- of the ASME Boiler and Pressure Ves- sure for which the boiler was originally sel Code (incorporated by reference; see designed and the revised safety valve 46 CFR 52.01–1) and § 56.50–30 of this sub- capacity cannot be recomputed and chapter. certified by the valve manufacturer, one of the tests described in PG–70(3) of [USCG–2003–16630, 73 FR 65161, Oct. 31, 2008] section I of the ASME Boiler and Pres- § 52.01–120 Safety valves and safety re- sure Vessel Code shall be conducted in lief valves (modifies PG–67 through the presence of the Inspector to insure PG–73). that the relieving capacity is sufficient (a)(1) Boiler safety valves and safety at the lower pressure. relief valves must be as indicated in (7) On new installations the safety PG–67 through PG–73 of section I of the valve nominal size for propulsion boil- ASME Boiler and Pressure Vessel Code ers and superheaters must not be less (incorporated by reference; see 46 CFR than 38mm (11⁄2 in.) nor more than 52.01–1) except as noted otherwise in 102mm (4 in.). Safety valves 38mm (11⁄2 this section. in.) to 114mm (41⁄2 in.) may be used for (2) A safety valve must: replacements on existing boilers. The (i) Be stamped in accordance with safety valve size for auxiliary boilers PG–110 of section I of the ASME Boiler must be between 19mm (3⁄4 in.) and and Pressure Vessel Code; 102mm (4 in.) NPS. The nominal size of (ii) Have its capacity certified by the a safety valve is the nominal diameter National Board of Boiler and Pressure (as defined in 56.07–5(b)) of the inlet Vessel Inspectors; opening. (iii) Have a drain opening tapped for (8) Lever or weighted safety valves not less than 6mm (1⁄4 in.) NPS; and now installed may be continued in use (iv) Not have threaded inlets for and may be repaired, but when renew- valves larger than 51mm (2 in.) NPS. als are necessary, lever or weighted (3) On river steam vessels whose boil- safety valves shall not be used. All ers are connected in batteries without such replacements shall conform to the means of isolating one boiler from an- requirements of this section. other, each battery of boilers shall be (9) Gags or clamps for holding the treated as a single boiler and equipped safety valve disk on its seat shall be with not less than two safety valves of carried on board the vessel at all times. equal size. (10) (Modifies PG–73.2.) Cast iron may (4) (Modifies PG–70.) The total rated be used only for caps and lifting bars. relieving capacity of drum and super- When used for these parts, the elon- heater safety valves as certified by the gation must be at least 5 percent in valve manufacturer shall not be less 51mm (2 inch) gage length. Nonmetallic than the maximum generating capac- material may be used only for gaskets ity of the boiler which shall be deter- and packing. mined and certified by the boiler man- (b)(1) (Modifies PG–68.) Superheater ufacturer. This capacity shall be in safety valves shall be as indicated in compliance with PG–70 of section I of PG–68 of section I of the ASME Boiler the ASME Boiler and Pressure Vessel and Pressure Vessel Code except as Code. noted otherwise in this paragraph.

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(2) The setting of the superheater be operated from the fireroom or safety valve shall not exceed the design engineroom floor. pressure of the superheater outlet [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as flange or the main steam piping beyond amended by CGD 81–79, 50 FR 9433, Mar. 8, the superheater. To prevent damage to 1985; USCG–2003–16630, 73 FR 65161, Oct. 31, the superheater, the drum safety valve 2008] shall be set at a pressure not less than that of the superheater safety valve § 52.01–130 Installation. setting plus 5 pounds minimum plus (a) Foundations. (1) Plans showing de- approximately the normal load pres- tails of proposed foundations and sup- sure drop through the superheater and port for boilers and the proposed means associated piping, including the con- of bracing boilers in the vessel shall be trolled desuperheater if fitted. See also submitted for approval to the Officer in § 52.01–95(b) (1). Charge, Marine Inspection, in the dis- (3) Drum pilot actuated superheater trict where the installation is being safety valves are permitted provided made. the setting of the pilot valve and super- (2) Provision shall be made in founda- heater safety valve is such that the tions for expansion of the boilers when superheater safety valve will open be- heated. fore the drum safety valve. (3) Boilers shall be provided with (c)(1) (Modifies PG–71.) Safety valves chocks to prevent movement in the shall be installed as indicated in PG–71 event of collision unless a bolted or riv- of section I of the ASME Boiler and eted construction satisfactorily pro- Pressure Vessel Code except as noted vides for this contingency. otherwise in this paragraph. (b) Protection of adjacent structure. (1) (2) The final setting of boiler safety Boilers shall be so placed that all parts valves shall be checked and adjusted are readily accessible for inspection under steam pressure and, if possible, and repair. while the boiler is on the line and the (2) In vessels having a double bottom steam is at operating temperatures, in or other extensive surfaces directly the presence of and to the satisfaction below the boiler, the distance between of a marine inspector who, upon ac- such surface and a boiler shall in no ceptance, shall seal the valves. This case be less than 18 inches at the low- regulation applies to both drum and est part. superheater safety valves of all boilers. (3) In certain types of vessels where (3) The safety valve body drains re- the boiler foundation forms the ashpit, quired by PG–71 of section I of the such foundations shall be efficiently ASME Boiler and Pressure Vessel Code ventilated, except in cases where the shall be run as directly as possible ashpit is partially filled with water at from the body of each boiler safety all times. valve, or the drain from each boiler (4) The pans of oil-burning, watertube safety valve may be led to an inde- boilers shall be arranged to prevent oil pendent header common only to boiler from leaking into the bilges and shall safety valve drains. No valves of any be lined with firebrick or other heat re- type shall be installed in the leakoff sisting material. from drains or drain headers and they (5) The distance between a boiler and shall be led to suitable locations to a compartment containing fuel oil avoid hazard to personnel. shall not be less than 24 inches at the (d)(1) (Modifies PG–72.) The operation back end of a boiler and 18 inches else- of safety valves shall be as indicated in where, except that for a cylindrical PG–72 of section I of the ASME Boiler part of a boiler or a knuckle in the cas- and Pressure Vessel Code except as ing of a water-tube boiler, these dis- noted in paragraph (d)(2) of this sec- tances may be reduced to 18 inches, tion. provided all parts are readily acces- (2) (Modifies PG–73.) The lifting device sible for inspection and repair. required by PG–73.1.3 of section I of the (6) All oil-burning boilers shall be ASME Boiler and Pressure Vessel Code provided with oiltight drip pans under shall be fitted with suitable relieving the burners and elsewhere as necessary gear so arranged that the controls may to prevent oil draining into the bilges.

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(c) Boiler uptakes. (1) Where dampers propulsion boilers, These tests are to are installed in the uptakes or funnels, be performed after final installation. the arrangement shall be such that it [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as will not be possible to shut off the gas amended by CGFR 69–127, 35 FR 9976, June 17, passages from the operating boilers. 1970; CGD 81–79, 50 FR 9433, Mar. 8, 1985; CGD (2) Each main power boiler and auxil- 88–057, 55 FR 24236, June 15, 1990; USCG–2003– iary boiler shall be fitted with a sepa- 16630, 73 FR 65162, Oct. 31, 2008] rate gas passage. § 52.01–140 Certification by stamping (modifies PG–104 through PG–113). § 52.01–135 Inspection and tests (modi- fies PG–90 through PG–100). (a) All boilers built in accordance with this part must be stamped with (a) Requirements. Inspection and test the appropriate ASME Code symbol as of boilers and boiler pressure parts required by PG–104 through PG–113 of shall be as indicated in PG–90 through section I of the ASME Boiler and Pres- PG–100 of section I of the ASME Boiler sure Vessel Code (incorporated by ref- and Pressure Vessel Code (incorporated erence; see 46 CFR 52.01–1). by reference; see 46 CFR 52.01–1) except (b)(1) Upon satisfactory completion as noted otherwise in this section. of the tests and Coast Guard inspec- (b) The inspections required by PG–90 tions, boilers must be stamped with the through PG–100 of the ASME Code following: shall be performed by the ‘‘Authorized (i) Manufacturer’s name and serial Inspector’’ as defined in PG–91 of sec- number; tion I of the ASME Boiler and Pressure (ii) ASME Code Symbol; Vessel Code (incorporated by reference; (iii) Coast Guard symbol, which is af- see 46 CFR 52.01–1). The Authorized In- fixed only by marine inspector (see spector shall hold a valid commission § 50.10–15 of this subchapter); issued by the National Board of Boiler (iv) Maximum allowable working ° ° and Pressure Vessel Inspectors. After pressure lll at lll C ( F): and installation, boilers will be inspected (v) Boiler rated steaming capacity in for compliance with this part by the kilograms (pounds) per hour (rated joules (B.T.U.) per hour output for high ‘‘Marine Inspector’’ as defined in temperature water boilers). § 50.10–15 of this subchapter. (2) The information required in para- (c) Hydrostatic test (Modifies PG–99). graph (b)(1) of this section must be lo- Each new boiler shall be cated on: hydrostatically tested after installa- (i) The front head or shell near the tion to 11⁄2 times the maximum allow- normal waterline and within 610 mm able working pressure as indicated in (24 inches) of the front of firetube boil- PG–99 of section I of the ASME Boiler ers; and and Pressure Vessel Code (incorporated (ii) The drum head of water tube boil- by reference; see 46 CFR 52.01–1). Before ers. the boilers are insulated, accessible (3) Those heating boilers which are parts of the boiler shall be emptied, built to section I of section I of the opened up and all interior surfaces ASME Boiler and Pressure Vessel Code shall be examined by the marine in- (incorporated by reference; see 46 CFR spector to ascertain that no defects 52.01–1), as permitted by § 53.01–10(e) of have occurred due to the hydrostatic this subchapter, do not require Coast test. Guard stamping and must receive full (d) Operating tests. In addition to hy- ASME stamping including the appro- drostatic tests prescribed in paragraph priate code symbol. (c) of this section, automatically con- (c) The data shall be legibly stamped trolled auxiliary boilers must be sub- and shall not be obliterated during the life of the boiler. In the event that the jected to operating tests as specified in portion of the boiler upon which the §§ 61.30–20, 61.35–1, 61.35–3, 62.30–10, 63.15– data is stamped is to be insulated or 9, 63.25–3, and 63.25–5 of this chapter, as otherwise covered, a metal nameplate appropriate, or as directed by the Offi- as described in PG–106.6 of section I of cer in Charge, Marine Inspection, for the ASME Boiler and Pressure Vessel

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Code (incorporated by reference; see 46 be nondestructively examined under CFR 52.01–1) shall be furnished and § 52.05–20. mounted. The nameplate is to be main- [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as tained in a legible condition so that amended by USCG–2003–16630, 73 FR 65162, the data may be easily read. Oct. 31, 2008] (d) Safety valves shall be stamped as indicated in PG–110 of the ASME Boiler § 52.05–20 Radiographic and ultrasonic and Pressure Vessel Code. examination (modifies PW–11 and PW–41.1). [CGD 81–79, 50 FR 9433, Mar. 8, 1985, as amended by USCG–2003–16630, 73 FR 65162, Radiographic and ultrasonic exam- Oct. 31, 2008] ination of welded joints must be as de- scribed in PW–11 of section I of the § 52.01–145 Manufacturers’ data report ASME Boiler and Pressure Vessel Code forms (modifies PG–112 and PG– (incorporated by reference; see 46 CFR 113). 52.01–1), except that parts of boilers The manufacturers’ data report fabricated of pipe material such as forms required by PG–112 and PG–113 of drums, shells, downcomers, risers, section I of the ASME Boiler and Pres- cross pipes, headers, and tubes con- sure Vessel Code (incorporated by ref- taining only circumferentially welded erence; see 46 CFR 52.01–1) must be butt joints, must be nondestructively made available to the marine inspector examined as required by § 56.95–10 of for review. The Authorized Inspector’s this subchapter even though they may National Board commission number be exempted by the limits on size spec- must be included on the manufactur- ified in table PW–11 and PW–41.1 of sec- ers’ data report forms. tion I of the ASME Boiler and Pressure Vessel Code. [CGD 81–79, 50 FR 9434, Mar. 8, 1985, as amended by USCG–2003–16630, 73 FR 65161, [USCG–2003–16630, 73 FR 65162, Oct. 31, 2008] Oct. 31, 2008] § 52.05–30 Minimum requirements for Subpart 52.05—Requirements for attachment welds (modifies PW–16). Boilers Fabricated by Welding (a) The location and minimum size of attachment welds for nozzles and other § 52.05–1 General (modifies PW–1 connections shall be as required by through PW–54). PW–16 of section I of the ASME Boiler (a) Boilers and component parts, in- and Pressure Vessel Code (incorporated cluding piping, that are fabricated by by reference; see 46 CFR 52.01–1) except welding shall be as indicated in PW–1 as noted otherwise in this section. through PW–54 of section I of the (b) When nozzles or couplings are at- ASME Boiler and Pressure Vessel Code tached to boilers, as shown in Figure (incorporated by reference; see 46 CFR PW–16 (a) and (c) of section I of the 52.01–1) except as noted otherwise in ASME Boiler and Pressure Vessel Code this subpart. and are welded from one side only, backing strips shall be used unless it [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as can be determined visually or by ac- amended by USCG–2003–16630, 73 FR 65162, Oct. 31, 2008] ceptable nondestructive test methods that complete penetration has been ob- § 52.05–15 Heat treatment (modifies tained. PW–10). (c) When attachments as shown in (a) Vessels and vessel parts shall be Figure PW–16 (y) and (z) of section I of preheated and postweld heat treated in the ASME Boiler and Pressure Vessel accordance with PW–38 and PW–39 of Code are employed they shall be lim- section I of the ASME Boiler and Pres- ited to 2-inch pipe size for pressure ex- sure Vessel Code (incorporated by ref- ceeding 150 pounds per square inch. erence; see 46 CFR 52.01–1) (reproduces [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as PW–10). This includes boiler parts made amended by USCG–2003–16630, 73 FR 65161, of pipe material even though they may Oct. 31, 2008]

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§ 52.05–45 Circumferential joints in PWT–11.3 of section I of the ASME pipes, tubes and headers (modifies Boiler and Pressure Vessel Code. PW–41). (c) In welded wall construction em- (a) Circumferential welded joints of ploying stub and welded wall panels pipes, tubes and headers shall be as re- which are field welded, approximately quired by PW–41 of section I of the 10 percent of the field welds shall be ASME Boiler and Pressure Vessel Code checked using any acceptable non- (incorporated by reference; see 46 CFR destructive test method. 52.01–1) except as noted otherwise in (d) Nondestructive testing of the butt this section. welded joints shall meet the require- (b) (Modifies PW–41.1) Circumferential ments of § 56.95–10 of this subchapter. welded joints in pipes, tubes, and head- ers of pipe material must be non- [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as destructively examined as required by amended by CGFR 69–127, 35 FR 9976, June 17, § 56.95–10 of this subchapter and PW–41 1970; CGD 81–79, 50 FR 9434, Mar. 8, 1985; of section I of the ASME Boiler and USCG–2003–16630, 73 FR 65161, Oct. 31, 2008] Pressure Vessel Code. (c) (Modifies PW–41.5) Butt welded Subpart 52.20—Requirements for connections shall be provided whenever Firetube Boilers radiography is required by § 56.95–10 of this subchapter for the piping system § 52.20–1 General (modifies PFT–1 in which the connection is to be made. through PFT–49). When radiography is not required, Firetube boilers and parts thereof welded socket or sleeve type joints shall be as indicated in PFT–1 through meeting the requirements of PW–41.5 of PFT–49 of section I of the ASME Boiler section I of the ASME Boiler and Pres- and Pressure Vessel Code (incorporated sure Vessel Code may be provided. by reference; see 46 CFR 52.01–1) except [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as as noted otherwise in this subpart. amended by CGD 81–79, 50 FR 9434, Mar. 8, 1985; USCG–2003–16630, 73 FR 65161, Oct. 31, [USCG–2003–16630, 73 FR 65161, Oct. 31, 2008] 2008] § 52.20–17 Opening between boiler and Subpart 52.15—Requirements for safety valve (modifies PFT–44). Watertube Boilers When a discharge pipe is used, it must be installed in accordance with § 52.15–1 General (modifies PWT–1 the requirements of § 52.01–105. through PWT–15). [CGD 81–79, 50 FR 9434, Mar. 8, 1985] Watertube boilers and parts thereof shall be as indicated in PWT–1 through § 52.20–25 Setting (modifies PFT–46). PWT–15 of section I of the ASME Boiler and Pressure Vessel Code (incorporated (a) The method of supporting firetube by reference; see 46 CFR 52.01–1) except boilers shall be as indicated in PFT–46 as noted otherwise in this subpart. of section I of the ASME Boiler and Pressure Vessel Code (incorporated by [CGD 81–79, 50 FR 9434, Mar. 8, 1985; USCG– 2003–16630, 73 FR 65161, Oct. 31, 2008] reference; see 46 CFR 52.01–1) except as noted otherwise in this section. § 52.15–5 Tube connections (modifies (b) The foundations shall meet the PWT–9 and PWT–11). requirements of § 52.01–130. (a) Tubes, pipe and nipples shall be [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as attached to sheets, heads, headers, and amended by USCG–2003–16630, 73 FR 65161, fittings as indicated in PWT–11 of sec- Oct. 31, 2008] tion I of the ASME Boiler and Pressure Vessel Code (incorporated by reference; see 46 CFR 52.01–1) except as noted oth- Subpart 52.25—Other Boiler Types erwise in this section. (b) (Replaces PWT–9.2 and PWT–11.3.) SOURCE: CGD 81–79, 50 FR 9434, Mar. 8, 1985, Threaded boiler tubes shall not be per- unless otherwise noted. mitted as described by PWT–9.2 and

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§ 52.25–1 General. (b) The application and end use of or- ganic fluid vaporizer generators shall Requirements for fired boilers of var- be approved by the Commandant. ious sizes and uses are referenced in table 54.01–5(a) of this subchapter. [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as amended by USCG–2003–16630, 73 FR 65161, § 52.25–3 Feedwater heaters (modifies Oct. 31, 2008] PFH–1). § 52.25–15 Fired thermal fluid heaters. In addition to the requirements in (a) Fired thermal fluid heaters shall PFH–1 of section I of the ASME Boiler be designed, constructed, inspected, and Pressure Vessel Code (incorporated tested, and stamped in accordance with by reference; see 46 CFR 52.01–1), the applicable provisions in this part. feedwater heaters must meet the re- (b) Each fired thermal fluid heater quirements in this part or the require- must be fitted with a control which ments in part 54. prevents the heat transfer fluid from [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as being heated above its flash point. amended by USCG–2003–16630, 73 FR 65161, (c) The heat transfer fluid must be Oct. 31, 2008] chemically compatible with any cargo carried in the cargo tanks serviced by § 52.25–5 Miniature boilers (modifies the heat transfer system. PMB–1 through PMB–21). (d) Each fired thermal fluid heater must be tested and inspected in accord- Miniature boilers must meet the ap- ance with the requirements of subpart plicable provisions in this part for the 61.30 of this chapter. boiler type involved and the mandatory requirements in PMB–1 through PMB– [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as 21 of section I of the ASME Boiler and amended by CGD 88–057, 55 FR 24236, June 15, Pressure Vessel Code (incorporated by 1990] reference; see 46 CFR 52.01–1) § 52.25–20 Exhaust gas boilers. [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as Exhaust gas boilers with a maximum amended by USCG–2003–16630, 73 FR 65161, allowable working pressure greater Oct. 31, 2008; USCG–2014–0688, 79 FR 58280, than 103 kPa gage (15 psig) or an oper- Sept. 29, 2014] ating temperature greater than 454 °C. (850 °F.) must be designed, constructed, § 52.25–7 Electric boilers (modifies inspected, tested and stamped in ac- PEB–1 through PEB–19). cordance with the applicable provisions Electric boilers required to comply in this part. The design temperature of with this part must meet the applica- parts exposed to the exhaust gas must ble provisions in this part and the man- be the maximum temperature that datory requirements in PEB–1 through could normally be produced by the PEB–19 except PEB–3 of section I of the source of the exhaust gas. This tem- ASME Boiler and Pressure Vessel Code perature must be verified by testing or (incorporated by reference; see 46 CFR by the manufacturer of the engine or 52.01–1). other equipment producing the ex- haust. Automatic exhaust gas boiler [CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as control systems must be designed, con- amended by USCG–2003–16630, 73 FR 65161, Oct. 31, 2008] structed, tested, and inspected in ac- cordance with § 63.25–7 of this chapter. § 52.25–10 Organic fluid vaporizer gen- [CGD 88–057, 55 FR 24236, June 15, 1990] erators (modifies PVG–1 through PVG–12). PART 53—HEATING BOILERS (a) Organic fluid vaporizer generators and parts thereof shall meet the re- Subpart 53.01—General Requirements quirements of PVG–1 through PVG–12 of section I of the ASME Boiler and Sec. 53.01–1 Incorporation by reference. Pressure Vessel Code (incorporated by 53.01–3 Adoption of section IV of the ASME reference; see 46 CFR 52.01–1) except as Boiler and Pressure Vessel Code. noted otherwise in this section. 53.01–5 Scope (modifies HG–100).

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