---
kind: "section"
citation: "46 C.F.R. § 154.1335"
title: "46"
number: "154.1335"
heading: "Pressure and vacuum protection."
url: "https://uscodex.org/cfr/46/154.1335"
---

# §154.1335. Pressure and vacuum protection.

- (a) Each cargo tank must have the following:
  - (1) **A pressure gauge that—**
    - (i) Monitors the vapor space;
    - (ii) Is readable at the tank; and
    - (iii) **Has remote readouts at the cargo control station.**
  - (2) If vacuum protection is required under [§ 154.804](/cfr/46/154.804.md), a vacuum gauge meeting paragraphs [(a)(1)(i)](#a-1-i), [(a)(1)(ii)](#a-1-ii), and [(a)(1)(iii)](#a-1-iii) of this section.
- (b) The vessel must have at least one high pressure alarm that:
  - (1) Actuates before the pressure in any cargo tank exceeds the maximum pressure specially approved by the Commandant (CG-OES); and
  - (2) Actuates an audible and visual alarm at the cargo control station, and a remote group alarm in the wheelhouse.
- (c) If vacuum protection is required under [§ 154.804](/cfr/46/154.804.md), the vessel must have at least one low pressure alarm that:
  - (1) Actuates before the pressure in any cargo tank falls below the minimum pressure specially approved by the Commandant (CG-522); and
  - (2) Actuates an audible and visual alarm at the cargo control station, and a remote group alarm in the wheelhouse.
- (d) At least one pressure gauge must be fitted on each:
  - (1) Enclosed hold;
  - (2) Enclosed interbarrier space;
  - (3) Cargo pump discharge line;
  - (4) Liquid cargo manifold; and
  - (5) **Vapor cargo manifold.**
- (e) There must be a local manifold pressure gauge between each manifold stop valve and each hose connection to the shore.

## 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]