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 .
46 C.F.R. §§52.05-15