§ 13.63. Pumps and compressors.
(a) Pumps and compressors shall be properly protected and mounted. They may be driven directly or by truck motor power take-off. The pumps, except constant speed centrifugal pumps, shall be equipped with suitable pressure actuated bypass valves permitting flow from pump discharge to pump suction or back to tank when the pump discharge pressure rises above a predetermined point.
(b) Pump discharge from positive displacement pumps shall be equipped with a spring loaded safety valve of nonleaking type, set at a pressure not to exceed 35% higher than the predetermined setting of the bypass valve.
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