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(continued) eater safety valve is such that the superheater safety valve will open before the drum safety valve.

(c)(1) (Modifies PG–71.) Safety valves shall be installed as indicated in PG–71 of the ASME Code except as noted otherwise in this paragraph.

(2) The final setting of boiler safety valves shall be checked and adjusted under steam pressure and, if possible, while the boiler is on the line and the steam is at operating temperatures, in the presence of and to the satisfaction of a marine inspector who, upon acceptance, shall seal the valves. This regulation applies to both drum and superheater safety valves of all boilers.

(3) The safety valve body drains required by PG–71 of the ASME Code shall be run as directly as possible from the body of each boiler safety valve, or the drain from each boiler safety valve may be led to an independent header common only to boiler safety valve drains. No valves of any type shall be installed in the leakoff from drains or drain headers and they shall be led to suitable locations to avoid hazard to personnel.

(d)(1) (Modifies PG–72.) The operation of safety valves shall be as indicated in PG–72 of the ASME Code except as noted in paragraph (d)(2) of this section.

(2) (Modifies PG–73.) The lifting device required by PG–73.1.3 of the ASME Code shall be fitted with suitable relieving gear so arranged that the controls may be operated from the fireroom or engineroom floor.

[CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as amended by CGD 81–79, 50 FR 9433, Mar. 8, 1985]

§ 52.01-130 Installation.
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(a) Foundations. (1) Plans showing details of proposed foundations and support for boilers and the proposed means of bracing boilers in the vessel shall be submitted for approval to the Officer in Charge, Marine Inspection, in the district where the installation is being made.

(2) Provision shall be made in foundations for expansion of the boilers when heated.

(3) Boilers shall be provided with chocks to prevent movement in the event of collision unless a bolted or riveted construction satisfactorily provides for this contingency.

(b) Protection of adjacent structure. (1) Boilers shall be so placed that all parts are readily accessible for inspection and repair.

(2) In vessels having a double bottom or other extensive surfaces directly below the boiler, the distance between such surface and a boiler shall in no case be less than 18 inches at the lowest part.

(3) In certain types of vessels where the boiler foundation forms the ashpit, such foundations shall be efficiently ventilated, except in cases where the ashpit is partially filled with water at all times.

(4) The pans of oil-burning, watertube boilers shall be arranged to prevent oil from leaking into the bilges and shall be lined with firebrick or other heat resisting material.

(5) The distance between a boiler and a compartment containing fuel oil shall not be less than 24 inches at the back end of a boiler and 18 inches elsewhere, except that for a cylindrical part of a boiler or a knuckle in the casing of a water-tube boiler, these distances may be reduced to 18 inches, provided all parts are readily accessible for inspection and repair.

(6) All oil-burning boilers shall be provided with oiltight drip pans under the burners and elsewhere as necessary to prevent oil draining into the bilges.

(c) Boiler uptakes. (1) Where dampers are installed in the uptakes or funnels, the arrangement shall be such that it will not be possible to shut off the gas passages from the operating boilers.

(2) Each main power boiler and auxiliary boiler shall be fitted with a separate gas passage.

§ 52.01-135 Inspection and tests (modifies PG–90 through PG–100).
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(a) Requirements. Inspection and test of boilers and boiler pressure parts shall be as indicated in PG–90 through PG–100 of the ASME Code except as noted otherwise in this section.

(b) The inspections required by PG–90 through PG–100 of the ASME Code shall be performed by the “Authorized Inspector” as defined in PG–91 of the ASME Code. The Authorized Inspector shall hold a valid commission issued by the National Board of Boiler and Pressure Vessel Inspectors. After installation, boilers will be inspected for compliance with this part by the “Marine Inspector” as defined in §50.10–15 of this subchapter.

(c) Hydrostatic test (Modifies PG–99). Each new boiler shall be hydrostatically tested after installation to 1 1/2 times the maximum allowable working pressure as indicated in PG–99 of the ASME Code. Before the boilers are insulated, accessible parts of the boiler shall be emptied, opened up and all interior surfaces shall be examined by the marine inspector to ascertain that no defects have occurred due to the hydrostatic test.

(d) Operating tests. In addition to hydrostatic tests prescribed in paragraph (c) of this section, automatically controlled auxiliary boilers must be subjected to operating tests as specified in §§61.30–20, 61.35–1, 61.35–3, 62.30–10, 63.15–9, 63.25–3, and 63.25–5 of this chapter, as appropriate, or as directed by the Officer in Charge, Marine Inspection, for propulsion boilers, These tests are to be performed after final installation.

[CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as amended by CGFR 69–127, 35 FR 9976, June 17, 1970; CGD 81–79, 50 FR 9433, Mar. 8, 1985; CGD 88–057, 55 FR 24236, June 15, 1990]

§ 52.01-140 Certification by stamping (modifies PG–104 through PG–113).
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(a) All boilers built in accordance with this part must be stamped with the appropriate ASME Code symbol as required by PG–104 through PG–113 of the ASME Code.

(b)(1) Upon satisfactory completion of the tests and Coast Guard inspections, boilers must be stamped with the following:

(i) Manufacturer's name and serial number;

(ii) ASME Code Symbol;

(iii) Coast Guard symbol, which is affixed only by marine inspector (see §50.10–15 of this subchapter);

(iv) Maximum allowable working pressure ___ at ___ °C (°F): and

(v) Boiler rated steaming capacity in kilograms (pounds) per hour (rated joules (B.T.U.) per hour output for high temperature water boilers).

(2) The information required in paragraph (b)(1) of this section must be located on:

(i) The front head or shell near the normal waterline and within 610 mm (24 inches) of the front of firetube boilers; and

(ii) The drum head of water tube boilers.

(3) Those heating boilers which are built to section I of the ASME Code, as permitted by §53.01–10(e) of this subchapter, do not require Coast Guard stamping and must receive full ASME stamping including the appropriate code symbol.

(c) The data shall be legibly stamped and shall not be obliterated during the life of the boiler. In the event that the portion of the boiler upon which the data is stamped is to be insulated or otherwise covered, a metal nameplate as described in PG–106.6 of the ASME Code shall be furnished and mounted. The nameplate is to be maintained in a legible condition so that the data may be easily read.

(d) Safety valves shall be stamped as indicated in PG–110 of the ASME Code.

[CGD 81–79, 50 FR 9433, Mar. 8, 1985]

§ 52.01-145 Manufacturers' data report forms (modifies PG–112 and PG–113).
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The manufacturers' data report forms required by PG–112 and PG–113 of the ASME Code must be made available to the marine inspector for review. The Authorized Inspector's National Board commission number must be included on the manufacturers' data report forms.

[CGD 81–79, 50 FR 9434, Mar. 8, 1985]

Subpart 52.05—Requirements for Boilers Fabricated by Welding
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§ 52.05-1 General (modifies PW–1 through PW–54).
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(a) Boilers and component parts, including piping, that are fabricated by welding shall be as indicated in PW–1 through PW–54 of the ASME Code except as noted otherwise in this subpart.

§ 52.05-15 Heat treatment (modifiesPW–10).
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(a) Vessels and vessel parts shall be preheated and postweld heat treated in accordance with PW–38 and PW–39 of the ASME Code (reproduces PW–10). This includes boiler parts made of pipe material even though they may be nondestructively examined under §52.05–20.

§ 52.05-20 Radiographic and ultrasonic examination (modifies PW–11 and PW–41.1).
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Radiographic and ultrasonic examination of welded joints shall be as described in PW–11 of the ASME Code except that parts of boilers fabricated of pipe material, such as drums, shells, downcomers. risers, cross pipes, headers and tubes containing only circumferentially welded butt joints, shall be nondestructively examined as required by §56.95–10 of this subchapter even though they may be exempted by the size limitations specified in PW–11.1.2 and PW–41.1 of the ASME Code.

[CGD 81–79, 50 FR 9434, Mar. 8, 1985]

§ 52.05-30 Minimum requirements for attachment welds (modifies PW–16).
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(a) The location and minimum size of attachment welds for nozzles and other connections shall be as required by PW–16 of the ASME Code except as noted otherwise in this section.

(b) When nozzles or couplings are attached to boilers, as shown in Figure PW–16 (a) and (c) of the ASME Code and are welded from one side only, backing strips shall be used unless it can be determined visually or by acceptable nondestructive test methods that complete penetration has been obtained.

(c) When attachments as shown in Figure PW–16 (y) and (z) of the ASME Code are employed they shall be limited to 2-inch pipe size for pressure exceeding 150 pounds per square inch.

§ 52.05-45 Circumferential joints in pipes, tubes and headers (modifies PW–41).
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(a) Circumferential welded joints of pipes, tubes and headers shall be as required by PW–41 of the ASME Code except as noted otherwise in this section.

(b) (Modifies PW–41.1) Circumferential welded joints in pipes, tubes, and headers of pipe material must be nondestructively examined as required by §56.95–10 of this subchapter and PW–41 of the ASME Code.

(c) (Modifies PW–41.5) Butt welded connections shall be provided whenever radiography is required by §56.95–10 of this subchapter for the piping system in which the connection is to be made. When radiography is not required, welded socket or sleeve type joints meeting the requirements of PW–41.5 of the ASME Code may be provided.

[CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as amended by CGD 81–79, 50 FR 9434, Mar. 8, 1985]

Subpart 52.15—Requirements for Watertube Boilers
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§ 52.15-1 General (modifies PWT–1through PWT–15).
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Watertube boilers and parts thereof shall be as indicated in PWT–1 through PWT–15 of the ASME Code except as noted otherwise in this subpart.

[CGD 81–79, 50 FR 9434, Mar. 8, 1985]

§ 52.15-5 Tube connections (modifies PWT–9 and PWT–11).
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(a) Tubes, pipe and nipples shall be attached to sheets, heads, headers, and fittings as indicated in PWT–11 of the ASME Code except as noted otherwise in this section.

(b) (Replaces PWT–9.2 and PWT–11.3.) Threaded boiler tubes shall not be permitted as described by PWT–9.2 and PWT–11.3 of the ASME Code.

(c) In welded wall construction employing stub and welded wall panels which are field welded, approximately 10 percent of the field welds shall be checked using any acceptable nondestructive test method.

(d) Nondestructive testing of the butt welded joints shall meet the requirements of §56.95–10 of this subchapter.

[CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as amended by CGFR 69–127, 35 FR 9976, June 17, 1970; CGD 81–79, 50 FR 9434, Mar. 8, 1985]

Subpart 52.20—Requirements for Firetube Boilers
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§ 52.20-1 General (modifies PFT–1 through PFT–49).
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(a) Firetube boilers and parts thereof shall be as indicated in PFT–1 through PFT–49 of the ASME Code except as noted otherwise in this subpart.

§ 52.20-17 Opening between boiler and safety valve (modifies PFT–44).
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When a discharge pipe is used, it must be installed in accordance with the requirements of §52.01–105.

[CGD 81–79, 50 FR 9434, Mar. 8, 1985]

§ 52.20-25 Setting (modifies PFT–46).
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(a) The method of supporting firetube boilers shall be as indicated in PFT–46 of the ASME Code except as noted otherwise in this section.

(b) The foundations shall meet the requirements of §52.01–130.

Subpart 52.25—Other Boiler Types
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Source: CGD 81–79, 50 FR 9434, Mar. 8, 1985, unless otherwise noted.

§ 52.25-1 General.
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Requirements for fired boilers of various sizes and uses are referenced in Table 54.01–5(a) of this subchapter.

§ 52.25-3 Feedwater heaters (modifies PFH–1).
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In addition to the requirements in PFH–1 of the ASME Code, feedwater heaters must meet the requirements in this part or the requirements in part 54.

§ 52.25-5 Miniature boilers (modifies PMB–1 through PMB–21).
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Miniature boilers must meet the applicable provisions in this part for the boiler type involved and the mandatory requirements in PMB–1 through PMB–21 of the ASME Code.

§ 52.25-7 Electric boilers (modifies PEB–1 through PEB–19).
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Electric boilers required to comply with this part must meet the applicable provisions in this part and the mandatory requirements in PEB–1 through PEB–19 except PEB–3 of the ASME Code.

§ 52.25-10 Organic fluid vaporizer generators (modifies PVG–1 through PVG–12).
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(a) Organic fluid vaporizer generators and parts thereof shall meet the requirements of PVG–1 through PVG–12 of the ASME Code except as noted otherwise in this section.

(b) The application and end use of organic fluid vaporizer generators shall be approved by the Commandant.

§ 52.25-15 Fired thermal fluid heaters.
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(a) Fired thermal fluid heaters shall be designed, constructed, inspected, tested, and stamped in accordance with the applicable provisions in this part.

(b) Each fired thermal fluid heater must be fitted with a control which prevents the heat transfer fluid from being heated above its flash point.

(c) The heat transfer fluid must be chemically compatible with any cargo carried in the cargo tanks serviced by the heat transfer system.

(d) Each fired thermal fluid heater must be tested and inspected in accordance with the requirements of subpart 61.30 of this chapter.

[CGFR 68–82, 33 FR 18815, Dec. 18, 1968, as amended by CGD 88–057, 55 FR 24236, June 15, 1990]

§ 52.25-20 Exhaust gas boilers.
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Exhaust gas boilers with a maximum allowable working pressure greater than 103 kPa gage (15 psig) or an operating temperature greater than 454 °C. (850 °F.) must be designed, constructed, inspected, tested and stamped in accordance with the applicable provisions in this part. The design temperature of parts exposed to the exhaust gas must be the maximum temperature that could normally be produced by the source of the exhaust gas. This temperature must be verified by testing or by the manufacturer of the engine or other equipment producing the exhaust. Automatic exhaust gas boiler control systems must be designed, constructed, tested, and inspected in accordance with §63.25–7 of this chapter.

[CGD 88–057, 55 FR 24236, June 15, 1990]