---
kind: "section"
citation: "46 C.F.R. § 64.59"
title: "46"
number: "64.59"
heading: "Spring loaded pressure relief valve."
url: "https://uscodex.org/cfr/46/64.59"
---

# §64.59. Spring loaded pressure relief valve.


A spring loaded pressure relief valve must—

- (a) Be set at a nominal pressure of 125 percent of the maximum allowable working pressure;
- (b) Have a minimum normal venting capacity that is sufficient to prevent the tank pressure from exceeding 137.5 percent of the maximum allowable working pressure;
- (c) Close after discharge of a pressure not lower than 115 percent of the maximum allowable working pressure; and
- (d) If closed, remain closed at any pressure less than 115 percent of the maximum allowable working pressure.

## Notes

### 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.