---
kind: "section"
citation: "46 C.F.R. § 154.904"
title: "46"
number: "154.904"
heading: "Inert gas system: Controls."
url: "https://uscodex.org/cfr/46/154.904"
---

# §154.904. Inert gas system: Controls.


The inert gas system must have:

- (a) At least one check valve in the cargo area to prevent the back flow of cargo vapor into the inert gas system, or another means specially approved by the Commandant (CG-OES);
- (b) If the inert gas system is in the machinery space or another space outside the cargo area, a second check valve in the cargo area meeting [paragraph (a)](#a) of this section;
- (c) Automatic and manual inert gas pressure controls; and
- (d) **Valves to isolate each inerted space.**

## 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]