---
kind: "section"
citation: "30 C.F.R. § 77.412"
title: "30"
number: "77.412"
heading: "Compressed air systems."
url: "https://uscodex.org/cfr/30/77.412"
---

# §77.412. Compressed air systems.

- (a) Compressors and compressed-air receivers shall be equipped with automatic pressure-relief valves, pressure gages, and drain valves.
- (b) Repairs involving the pressure system of compressors, receivers, or compressed-air-powered equipment shall not be attempted until the pressure has been relieved from that part of the system to be repaired.
- (c) At no time shall compressed air be directed toward a person. When compressed air is used, all necessary precautions shall be taken to protect persons from injury.
- (d) Safety chains or suitable locking devices shall be used at connections to machines of high-pressure hose lines of 1-inch inside diameter or larger, and between high-pressure hose lines of 1-inch inside diameter or larger, where a connection failure would create a hazard.

## Notes

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 36 FR 9364, May 22, 1971, unless otherwise noted.