---
kind: "section"
citation: "46 C.F.R. § 143.300"
title: "46"
number: "143.300"
heading: "Pressure vessels."
url: "https://uscodex.org/cfr/46/143.300"
---

# §143.300. Pressure vessels.

- (a) Pressure vessels over 5 cubic feet in volume and over 15 pounds per square inch maximum allowable working pressure (MAWP) must be equipped with an indicating pressure gauge (in a readily visible location) and with one or more spring-loaded relief valves. The total relieving capacity of such relief valves must prevent pressure from exceeding the MAWP, as established by the manufacturer, by more than 10 percent.
- (b) Pressure vessels must be externally examined annually. Relief valves must be tested in accordance with [§ 143.245](/cfr/46/143.245.md).
- (c) All pressure vessels must have the MAWP indicated by a stamp, nameplate, or other means visible to the crew.
- (d) Pressure vessels installed after July 20, 2018, or the date the vessel obtains a Certificate of Inspection (COI), whichever date is earlier, must meet the requirements of [§ 143.545](/cfr/46/143.545.md).

## Notes

### Amendments

[USCG-2006-24412, 81 FR 40101, June 20, 2016; 81 FR 47312, July 21, 2016]

### Authority

Authority: 46 U.S.C. 3103, 3301, 3306, 3308, 3316, 8104, 8904; 33 CFR 1.05; DHS Delegation No. 0170.1.

### Source

Source: USCG-2006-24412, 81 FR 40101, June 20, 2016, unless otherwise noted.

### Amendments

[USCG-2006-24412, 81 FR 40101, June 20, 2016; 81 FR 47312, July 21, 2016]