(a) Pressure vessels and vessel parts that are fabricated by welding must be as required by paragraphs UW-1 through UW-65 of Section VIII of the ASME BPVC (incorporated by reference; see § 54.01-1) except as noted otherwise in this subchapter.

(b) [Reserved]

[CGFR 68-82, 33 FR 18828, Dec. 18, 1968, as amended by USCG-2003-16630, 73 FR 65170, Oct. 31, 2008]

(a) Pressure vessels containing hazardous materials as defined in § 150.115 of this subchapter must be of the class and construction required by subchapters D, I, or O of this chapter, or, when not specified, of a class determined by the Commandant.

(b) Class III pressure vessels must not be used for the storage or stowage of hazardous materials unless there is specific authorization in subchapters D, I, or O of this chapter.

[CGD 77-147, 47 FR 21810, May 20, 1982]

(a) Fabrication by welding must be in accordance with the provisions of this part and with part 57 of this subchapter.

(b) Welding subject to UW-11(a) of Section VIII of the ASME BPVC (incorporated by reference; see § 54.01-1) must be modified as described in § 54.25-8 for radiographic examination.

(c) A butt-welded joint with one plate edge offset, as shown in Figure UW-13.1(k) of Section VIII of the ASME BPVC, may only be used for circumferential joints of Class II and Class III pressure vessels.

(d) Attachment welds for nozzles and other connections must be in accordance with UW-16 of Section VIII of the ASME BPVC. When nozzles or connections are made to pressure vessels, as shown in Figure UW-16.1 (a) and (c) of the ASME BPVC, and are welded from one side only, backing strips must be used unless it can be determined visually that a full penetration weld has been achieved.

(e) When fabricating by welding the minimum joint requirements must be as specified under the column headed “minimum joint requirements” in table 2 to § 54.01-5 for various classes of pressure vessels.

(f) Joints in Class II or III pressure vessel cargo tanks must meet the following:

(1) Category A and B joints must be type (1) or (2).

(2) Category C and D joints must have full penetration welds extending through the entire thickness of the vessel wall or nozzle wall.

[CGFR 68-82, 33 FR 18828, Dec. 18, 1968, as amended by CGD 77-147, 47 FR 21810, May 20, 1982; CGD 85-061, 54 FR 50964, Dec. 11, 1989; USCG-2003-16630, 73 FR 65170, Oct. 31, 2008]

(a) Performance and procedure qualification. No production welding must be done until welding procedures and welders have been qualified in accordance with part 57 of this subchapter.

(b) Tests. Production tests are required in accordance with § 57.06-1 of this subchapter.

[CGFR 68-82, 33 FR 18828, Dec. 18, 1968, as amended by CGFR 69-127, 35 FR 9977, June 17, 1970]