154.703—Methane (LNG).
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:
(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:
[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983]