{"data":{"id":"us/46-cfr-154.703","jurisdiction":"us","citation":"46 CFR 154.703","heading":"Methane (LNG).","body":"Unless a cargo tank carrying methane (LNG) can withstand the pressure build up due to boil-off for 21 days, the pressure in the cargo tank must be maintained below the set pressure of the safety relief valve for at least 21 days by:\n(a) A refrigeration system that meets § 154.702;\n(b) A waste heat or catalytic furnace that burns boil-off gas, and:\n(1) Maintains the stack exhaust temperature below 535 °C (995 °F);\n(2) Exhibits no visible flame; and\n(3) Is specially approved by the Commandant (CG-OES);\n(c) Boilers, inert gas generators, and combustion engines in the main propelling machinery space that use boil-off gas as fuel; or\n(d) Equipment for services, other than those under paragraph (c) of this section, that use boil-off gas as fuel and that are located:\n(1) In the main propelling machinery space; or\n(2) a space specially approved by the Commandant (CG-OES).","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":"7b9db7301a7a1f6fea0e4525ac12be7a5aa3eaa76fcf873bace83a517932cb8d","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-154.702","next":"us/46-cfr-154.705"},"notice":"GroundRules: Original legal text. Not legal advice."}