30 C.F.R. § 57.13021 High-pressure hose connections.
Title 30 - Mineral Resources
Except where automatic shutoff valves are used, safety chains or other suitable locking devices shall be used at connections to machines of high-pressure hose lines of
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart L—Compressed Air and Boilers
§ 57.13021 High-pressure hose connections.
