MSHA - Code of Federal Regulations - 30 CFR 57.13021
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MSHA - Title 30 CFR
30 CFR § 57.13021
High-pressure hose connections.
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 3/4-inch inside diameter or larger, and between high-pressure hose lines of 3/4-inch inside diameter or larger, where a connection failure would create a hazard.