46 CFR §52.05-45

1. (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.
2. (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.
3. (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.