---
kind: "section"
citation: "46 C.F.R. § 64.71"
title: "46"
number: "64.71"
heading: "Marking of pressure relief devices."
url: "https://uscodex.org/cfr/46/64.71"
---

# §64.71. Marking of pressure relief devices.


A pressure relief device must be plainly and permanently marked with the—

- (a) Set pressure rating;
- (b) Rated flow capacity expressed as cubic feet of standard air (60 °F 14.7 psia) per minute and the pressure at which the flow capacity is determined;
- (c) Manufacturer's name and identifying number; and
- (d) **Pipe size of inlet.**

## 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.