30 CFR § 75.1730 Compressed air; general; compressed air systems.
(a) All pressure vessels shall be constructed, installed, and
maintained in accordance with the standards and specifications of Section
VIII "Unfired Pressure Vessels," of the American Society of Mechanical
Engineers Boiler and Pressure Vessel Code (1971), which is hereby
incorporated by reference and made a part hereof. This document may be
purchased from the American Society of Mechanical Engineers, 22 Law Drive,
P.O. Box 2900, Fairfield, New Jersey 07007, Phone: 800-843-2763 (toll
free); http://www.asme.org; and it is available for examination in
every MSHA Coal Mine Safety and Health district office.
(b) Compressors and compressed-air receivers shall be equipped with
automatic pressure-relief valves, pressure gages, and drain valves.
(c) 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.
(d) 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.
(e) Safety chains, suitable locking devices, or automatic cut-off
valves shall be used at connections to machines of high-pressure hose lines
of three-fourths of an inch inside diameter or larger, and between
high-pressure hose lines of three-fourths of an inch inside diameter or
larger, where a connection failure would create a hazard. For purposes of
this paragraph, high-pressure means pressure of 100 p.s.i. or more.
[38 FR 4976, Feb. 23, 1973] Subpart S Approved Books and Records