Section III. OPERATION UNDER USUAL CONDITIONS

Operator's Preventive Maintenance Checks and Services - Continued - TM-10-4320-310-14_36

TM-10-4320-310-14 Pump Unit Flammable Liquid Centrifugal Self-Priming 2-Inch 100 GPM Diesel Engine Driven NSN 4320-01-263-3604 Manual
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TM 10-4320-310-14 Section III. OPERATION UNDER USUAL CONDITIONS 2-3. ASSEMBLY AND PREPARATION FOR USE a. The centrifugal pump unit comes fully assembled, ready for use after attaching suction (intake) and discharge hoses (not supplied with unit). (1) The pump is equipped with a 2 inch (5.08 centimeters) quick disconnect female coupling on the suction side of the pump. Remove dust plug and connect a non-collapsible hose to the suction side of the centrifugal pump unit so as to keep the suction line as short as possible. Avoid laying the line over rises which will form pockets. The highest point in the suction hose should be at the pump. (2) Reduction in the pumping capacity becomes noticeable at lifts in excess of 15 feet (4.57 meters) and is very pronounced at 25 feet (7.62 meters). If the pump is operated at a high suction lift, use extra care that all hose connections are air tight. A small air leak in the suction line may prevent priming of the pump. Note Do not use the centrifugal pump unit for suction in excess of 25 feet (7.62 meters). (3) The pump is equipped with a 2 inch (5.08 centimeters) quick disconnect male coupling on the discharge side of the pump. Remove dust cap and connect a collapsible hose to the discharge side of the pump. Make sure the hose connection is tight. The centrifugal pump unit must be connected to a suitable ground before operation. Arcing caused by a buildup of static electricity may Ignite volatile fluids and cause an explosion and fire. b. The pump unit may be grounded to an underground metallic water system, a driven metal rod or a buried metal plate. A ground rod must have a minimum diameter of 5/8 inch if solid or 3/4 inch if pipe and must be driven to a minimum depth of 8 feet. A ground plate must have a minimum area of 9 square feet and must be buried to a minimum depth of 4 feet. The ground lead must be at least number 6 average wire gauge (AWG) copper wire. If ground rod is used, connect the pump unit to the ground rod as follows: (1) Insert ground cable into slot in ground stud and tighten. (2) Connect coupling to ground rod and install driving stud. Make sure that driving stud seats on ground rod. (3) Drive ground rod into ground until coupling is just above surface. (4) Remove driving stud and install another section of ground rod making sure that it seats on first section. (5) Install another coupling and driving stud. Drive ground rod until new coupling is just above ground surface. (6) Use a minimum of three sections of 3 foot length ground rods. Add additional sections until ground rod has been driven sufficiently deep to provide effective ground. (7) Remove driving stud and top coupling. 2-23

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