§154.703. Methane (LNG).
46 C.F.R. § 154.703
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 refrigeration system that meets § 154.702;
A waste heat or catalytic furnace that burns boil-off gas, and—
Maintains the stack exhaust temperature below 535 °C (995 °F);
Exhibits no visible flame; and
Is specially approved by the Commandant (CG-OES);
Boilers, inert gas generators, and combustion engines in the main propelling machinery space that use boil-off gas as fuel; or
Equipment for services, other than those under paragraph (c) of this section, that use boil-off gas as fuel and that are located:
In the main propelling machinery space; or
a space specially approved by the Commandant (CG-OES).
Notes, amendments, and revision history
Amendments
[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983]
Authority
Authority: 46 U.S.C. 3703, 9101; Department of Homeland Security Delegation No. 0170.1.
Source
Source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.
Amendments
[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983]