---
kind: "section"
citation: "46 C.F.R. § 64.65"
title: "46"
number: "64.65"
heading: "Vacuum relief device."
url: "https://uscodex.org/cfr/46/64.65"
---

# §64.65. Vacuum relief device.

- (a) Each MPT that is designed for an external pressure of less than 7.5 psig must have a vacuum relief device.
- (b) **A vacuum relief device for an MPT must—**
  - (1) Open at an external pressure of not less than 3 psig; and
  - (2) Have an opening with a cross-section of 0.44 square inch or more.

## Notes

### Amendments

[CGD 84-043, 55 FR 37410, Sept. 11, 1990]

### Authority

Authority: 46 U.S.C. 3306, 3703; 49 U.S.C. App. 1804; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3.

### Source

Source: CGD 73-172, 39 FR 22950, June 25, 1974, unless otherwise noted.

### Amendments

[CGD 84-043, 55 FR 37410, Sept. 11, 1990]