---
kind: "section"
citation: "46 C.F.R. § 64.47"
title: "46"
number: "64.47"
heading: "Type of relief devices."
url: "https://uscodex.org/cfr/46/64.47"
---

# §64.47. Type of relief devices.

- (a) An MPT with an internal capacity of more than 550 U.S. gallons must have one or more spring loaded relief valves. In addition, a rupture disc may be attached.
- (b) An MPT with an internal capacity of 550 U.S. gallons or less must have a rupture disc or a spring loaded relief valve.

## 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.