---
kind: "section"
citation: "46 C.F.R. § 154.405"
title: "46"
number: "154.405"
heading: "Design vapor pressure (P o ) of a cargo tank."
url: "https://uscodex.org/cfr/46/154.405"
---

# §154.405. Design vapor pressure (P o ) of a cargo tank.

- (a) The design vapor pressure (Po) of a cargo tank must be equal to or greater than the MARVS.
- (b) The Po of a cargo tank must be equal to or greater than the vapor pressure of the cargo at 45 °C (113 °F) if:
  - (1) The cargo tank has no temperature control for the cargo; and
  - (2) **The vapor pressure of the cargo results solely from ambient temperature.**
- (c) The Po of a cargo tank may be exceeded under harbor conditions if specially approved by the Commandant (CG-ENG).

## 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]