A-A-52027
Design and performance.
Pump. The pump shall be self priming and either the centrifugal or the positive displacement type.
The pump case and all the internal working parts which contact the pumped fluid shall be of a nonsparking material compatible with diesel fuel, kerosene, and leaded gasoline. The pump casing shall incorporate a drain receptacle and have the suction and discharge ports identified by casts in the casing. A direction arrow shall be cast in the centrifugal pump casing to indicate the direction of impeller rotation. The pump shall be equipped with self-lubricating
mechanical seals. The pump shall be furnished with a suction strainer with a maximum of
40-mesh openings. The pump shall be capable of transferring from 35 to 50 GPM of diesel fuel in the viscosity range of 1.3 to 5.0 centistokes at 20 oC at 20 feet of head. The pump shall prime within two minutes on a 5-foot static suction lift and shall deliver fuel at its rated capacity when positioned at an angle up to 15 degrees from the horizontal. The positive displacement pump shall be provided with a bypass system to avoid overpressurization of the hose assemblies when at a no-flow condition.
Electric motor. The motor shall conform to NEMA MG-1, be direct current, 24 volt, totally enclosed, non-ventilated, and water-proof. The motor shall be explosion-proof and conform to UL 674 for class I, groups C and D and class II, groups F and G. The electric motor shall be equipped with a thermostat to sense approaching overheat conditions and shut off the motor before damage occurs. The electric motor shall be provided with short circuit and overload protection. The electrical circuitry, including all components and connections that are not hermetically sealed or inherently resistant, shall be protected from the effects of moisture and fungus growth.
Protective frame. The unit shall be housed in a protective frame. The complete assembly shall be a maximum size of 28 inches long, 18 inches wide, and 18 inches high, with a maximum weight of
80 pounds. The frame shall allow access for operation and maintenance and be of sufficient strength to allow the unit to be dropped from a height of four feet. The frame shall contain provisions for storing the slave cable and have handles or grasp areas to allow for two-soldier transportability. The frame shall be labeled " TWO SOLDIER CARRY" in 1-1/2 (±1/8) inch high characters when the frame width permits, otherwise, the characters shall be as high as the frame width allows. The character color shall contrast with the background color.
Accessories.
Grounding assembly. A grounding assembly shall be provided with each unit. The grounding assembly shall include 75 ±1 inches of no. 10 wire connected to two "plier type" ground terminals and a copper clad steel grounding rod 1/2 inch diameter by 60 inches long. The pumping unit shall incorporate a non-painted grounding lug to accommodate a ground terminal.
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