Boilers and component parts, including piping, that are fabricated by welding must be as indicated in PW-1 through PW-54 of Section I of the ASME BPVC (incorporated by reference; see § 52.01-1) except as noted otherwise in this subpart.

Vessels and vessel parts must be preheated and postweld heat treated in accordance with PW-38 and PW-39 of Section I of the ASME BPVC (incorporated by reference; see § 52.01-1). This includes boiler parts made of pipe material, even though they may be nondestructively examined under § 52.05-20.

Radiographic and ultrasonic examination of welded joints must be as described in PW-11 of Section I of the ASME BPVC (incorporated by reference; see § 52.01-1). Parts of boilers, fabricated of pipe material such as drums, shells, downcomers, risers, cross pipes, headers, and tubes containing only circumferentially welded butt joints, must be nondestructively examined as required by § 56.95-10 of this subchapter.

(a) The location and minimum size of attachment welds for nozzles and other connections must be as required by PW-16 of Section I of the ASME BPVC (incorporated by reference; see § 52.01-1) 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 Section I of the ASME BPVC, and are welded from one side only, backing strips must be used unless it can be determined visually or by nondestructive test methods that complete penetration has been obtained.

(c) When attachments as shown in Figure PW-16 (y) and (z) of Section I of the ASME BPVC are employed they must be limited to 2-inch pipe size for pressure exceeding 150 psig.

(a) Circumferential welded joints of pipes, tubes and headers must be as required by PW-41 of Section I of the ASME BPVC (incorporated by reference; see § 52.01-1) 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 Section I of the ASME BPVC.

(c) (Modifies PW-41.5.) Butt-welded connections must 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 Section I of the ASME BPVC may be provided.