46 C.F.R. § 154.703 Methane (LNG).
Title 46 - Shipping
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: (a) A refrigeration system that meets §154.702; (b) A waste heat or catalytic furnace that burns boil-off gas, and: (1) Maintains the stack exhaust temperature below 535 °C (995 °F); (2) Exhibits no visible flame; and (3) Is specially approved by the Commandant (G-MSO); (c) Boilers, inert gas generators, and combustion engines in the main propelling machinery space that use boil-off gas as fuel; or (d) Equipment for services, other than those under paragraph (c) of this section, that use boil-off gas as fuel and that are located: (1) In the main propelling machinery space; or (2) a space specially approved by the Commandant (G-MSO). [CGD 74–289, 44 FR 26009, May 3, 1979, as amended by CGD 82–063b, 48 FR 4782, Feb. 3, 1983]
Title 46: Shipping
PART 154—SAFETY STANDARDS FOR SELF-PROPELLED VESSELS CARRYING BULK LIQUEFIED GASES
Subpart C—Design, Construction and Equipment
Cargo Pressure and Temperature Control
§ 154.703 Methane (LNG).
