A-A-52038
Design and performance:
Pump: The pump shall be straight centrifugal, single-suction, single-stage, vertical split-case, auxiliary priming type. The maximum net positive suction head (NPSH) requirement shall not exceed 9 feet of water at 225 gpm at 350 feet total head at not more than the manufacturer’s recommended speed of the engine. A check valve assembly shall be provided on the discharge side of the pump. The pump assembly shall include a welded skid base with rounded ends for skidding. The pump assembly shall have a lifting bracket located at the center of gravity of the pump assembly to enable lifting from above. Permanently affixed tiedown provisions that permit fastening the pump to the floor or deck of a transportation medium shall be provided. Using water with 15 feet or 25 feet of suction line (as applicable), containing one elbow, the pump shall meet the following priming requirements:
a. Prime in not more than 1 minute under a 10-foot static suction lift.
b. Prime in not more than 5 minutes under a 20-foot static suction lift.
When operated at a speed not exceeding the maximum continuous speed of the engine as recommended by the engine manufacturer, with a lift of 10 feet through 20 feet of 3-inch suction hose, the pump assembly shall prime and discharge water as follows:
c. Deliver a minimum of 200 gallons per minute (gpm) at 300-foot total head when operated under a 10-foot, static suction lift at not more than the manufacturer’s recommended governed speed of the engine.
d. Deliver a minimum of 170 gpm when operated under a 20-foot, static suction lift at not more than the manufacturer’s recommended governed speed of the engine.
Diesel engine: The engine shall meet all operational requirements and conditions specified herein, or, the engine manufacturer’s recommended operating limits. A fuel tank shall be furnished. The capacity of the tank shall be sufficient for not less than 4 hours of continuous operation at the rated load.
Instrumentation: An instrument panel shall be furnished and shall be equipped with the following instruments:
a. Gauge, pressure, engine lubricating oil.
b. Tachometer and hourmeter.
c. Ammeter, battery charging.
D, Engine coolant temperature gauge (if liquid cooled).
Manual engine controls shall include a fuel priming system, cold starting control, either starting aid if required, switch, and throttle. An electrical cranking system based on the use of a 12-volt electrical circuit energized by storage batteries shall be furnished.
Safety: The contractor shall certify that the pump assembly complies with all Federal Safety Standards.
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