{"data":{"id":"us/46-cfr-154.660","jurisdiction":"us","citation":"46 CFR 154.660","heading":"Pipe welding.","body":"(a) Pipe welding must meet part 57 of this chapter.\n(b) Longitudinal butt welds, in piping that does not meet a standard or specification under § 56.60-1 of this chapter, and girth butt welds must meet the following:\n(1) Butt welds of pipes made from carbon, carbon manganese, or low alloy steels must meet § 56.50-105 of this chapter, including the requirements for post-weld heat treatment.\n(2) Except for piping inside an independent cargo tank type A, B, or C, butt welds must be 100% radiographically tested if the design temperature is lower than −10 °C (14 °F), and:\n(i) The wall thickness is greater than 10 mm (0.394 in.); or\n(ii) The nominal pipe diameter is greater than 100 mm (nominal 4 in.).\n(3) If Table 4 references this section, butt welds for deck cargo piping exceeding 75 mm (3 in.) in diameter must be 100% radiographically tested.\n(4) Butt welds of pipes not meeting paragraph (b)(2) or (b)(3) of this section must meet the non-destructive testing requirements under Subpart 56.95 of this chapter.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER O—CERTAIN BULK DANGEROUS CARGOES","PART 154—SAFETY STANDARDS FOR SELF-PROPELLED VESSELS CARRYING BULK LIQUEFIED GASES","Subpart C—Design, Construction and Equipment"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"6b926ba5805283ad35cb1c73597cfe3151417a9e6b3e426f5072f7f1f3784a55","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-154.655","next":"us/46-cfr-154.665"},"notice":"GroundRules: Original legal text. Not legal advice."}