{"data":{"id":"us/46-cfr-154.522","jurisdiction":"us","citation":"46 CFR 154.522","heading":"Materials for piping.","body":"(a) The materials for piping systems must meet § 154.625 for the minimum design temperature of the piping, except the material for open ended vent piping may be specially approved by the Commandant (CG-ENG) if:\n(1) The temperature of the cargo at the pressure relief valve setting is −55 °C (−67 °F) or warmer; and\n(2) Liquid cannot discharge to the vent piping.\n(b) Materials for piping outside the cargo tanks must have a melting point of at least 925 °C (1697 °F), except for short lengths of pipes with fire resisting insulation that are attached to the cargo tanks.","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":"b0ab26d4dc7dd1c174c8abdc4ba42889621c95859f3b8c047b612d644cafc240","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-154.520","next":"us/46-cfr-154.524"},"notice":"GroundRules: Original legal text. Not legal advice."}