(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.