---
kind: "section"
citation: "46 C.F.R. § 154.1848"
title: "46"
number: "154.1848"
heading: "Inerting."
url: "https://uscodex.org/cfr/46/154.1848"
---

# §154.1848. Inerting.

- (a) The master shall ensure that:
  - (1) Hold and interbarrier spaces on a vessel with full secondary barriers are inerted so that the oxygen concentration is 8 percent or less by volume when flammable cargoes are carried;
  - (2) **Hold and interbarrier spaces contain only dry air or inert gas on—**
    - (i) A vessel with partial secondary barriers;
    - (ii) A vessel with full secondary barriers when non-flammable cargoes are carried; and
    - (iii) A vessel with refrigerated independent tanks type C;
  - (3) When cargo tanks containing flammable vapor are to be gas freed, the flammable vapors are purged from the tank by inert gas before air is admitted; and
  - (4) When gas free cargo tanks are to be filled with a flammable cargo, air is purged from the tank by inert gas until the oxygen concentration in the tank is 8 percent or less by volume before cargo liquid or vapor is introduced.
- (b) Inert gas must be supplied from the shore or from the vessel's inert gas system.

## Notes

### 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.