---
kind: "section"
citation: "46 C.F.R. § 154.806"
title: "46"
number: "154.806"
heading: "Capacity of pressure relief valves."
url: "https://uscodex.org/cfr/46/154.806"
---

# §154.806. Capacity of pressure relief valves.


Pressure relief valves for each cargo tank must have a combined relief capacity, including the effects of back pressure from vent piping, headers, and masts, to discharge the greater of the following with not more than a 20% rise in cargo tank pressure above the set pressure of the relief valves:

- (a) The maximum capacity of an installed cargo tank inerting system if the maximum attainable working pressure of the cargo tank inerting system exceeds the set pressure of the relief valves.
- (b) The quantity of vapors generated from fire exposure that is calculated under [§ 54.15-25](/cfr/46/54.15-25.md) of this chapter.

## Notes

### 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.