---
kind: "section"
citation: "46 C.F.R. § 154.903"
title: "46"
number: "154.903"
heading: "Inert gas systems: General."
url: "https://uscodex.org/cfr/46/154.903"
---

# §154.903. Inert gas systems: General.

- (a) Inert gas carried or generated to meet §§ [154.901](/cfr/46/154.901.md), [154.902](/cfr/46/154.902.md), and [154.1848](/cfr/46/154.1848.md) must be non-flammable and non-reactive with the cargoes that the vessel is certificated to carry and the materials of construction of the cargo tanks, hold and interbarrier spaces, and insulation.
- (b) The boiling point and dew point at atmospheric pressure of the inert gas must be below the temperature of any surface in those spaces or −45 °C (−49 °F), whichever is warmer.
- (c) For the temperatures and pressures at which the gas is stored and used, storage vessels and inert gas piping must meet §§ [154.450](/cfr/46/154.450.md) and [154.500](/cfr/46/154.500.md) respectively.

## Notes

### Amendments

[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by USCG-2014-0688, 79 FR 58285, Sept. 29, 2014]

### 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 USCG-2014-0688, 79 FR 58285, Sept. 29, 2014]