MSHA - Code of Federal Regulations - 30 CFR 56.13011
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MSHA - Title 30 CFR
30 CFR § 56.13011
Air receiver tanks.


Air receiver tanks shall be equipped with one or more automatic pressure-relief valves. The total relieving capacity of the relief valves shall prevent pressure from exceeding the maximum allowable working pressure in a receiver tank by not more than 10 percent. Air receiver tanks also shall be equipped with indicating pressure gauges which accurately measure the pressure within the air receiver tanks.