---
kind: "section"
citation: "46 C.F.R. § 154.703"
title: "46"
number: "154.703"
heading: "Methane (LNG)."
url: "https://uscodex.org/cfr/46/154.703"
---

# §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:

- (a) A refrigeration system that meets [§ 154.702](/cfr/46/154.702.md);
- (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 (CG-OES);
- (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)](#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 (CG-OES).

## Notes

### 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]