46 CFR 105.20-10 - Pumps.

§ 105.20-10 Pumps.
(a) Pumps for cargo dispensing shall be of a type satisfactory for the purpose.
(b) A relief valve shall be provided on the discharge side of pump if the pressure under shutoff conditions exceeds 60 pounds. When a relief valve is installed, it shall discharge back to the suction of the pump.
(c) Where electric motors are installed with dispensing pumps they shall be explosion proof and shall be labeled as explosion proof by Underwriter's Laboratories, Inc., or other recognized laboratory, as suitable for Class I, Group D atmospheres.
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Executive Order ... 11735