TM 5-4610-223-12
g.
Raw Water Pump.
(1)
Select a suitable location for the electric driven raw water pump (28, fig. 2-6), as close to the level of the
water source as possible, and not more than 50 feet (15 m) from the water purification unit (15). Secure the pump on a
firm, level foundation of planking or timbers to prevent shifting and setting while in operation.
(2)
When the situation requires, use two raw water pumps in series. The maximum suction lift for each pump
must not exceed 20 feet (6 m). The performance of the pump will improve if suction lift is less than 20 feet (6 m).
NOTE
Ordinarily, an adapter (7, fig. 2-19) is in the water pump intake flange (6). Also a nipple (4), elbow
(3), and adapter (2) are installed on the discharge side of the pump. In case the above items are not
installed, it will be necessary to install them before attaching the hoses.
NOTE
Be extra careful in handling hose fittings. The soft metal is easily damaged by dropping onto a hard
surface. Damaged fittings are subject to leakage or, in extreme cases, cannot be connected.
NOTE
Ensure that all hose connections and the pump cover flange are tight. Loose connections will permit
air leakage and prevent pump from pumping.
h.
Raw Water Supply Lines.
(1)
After the raw water pump has been positioned, connect as many 1 1/2 inch rubber hose assemblies as
necessary to reach the water source (26, fig. 2-6). Connect the female end of the hose line (27) to the hose end of the
pump adapter (23). Connect strainer (25) to the other end of this hose line.
(2)
Submerge suction hose strainer (25) well below surface of water but keep it off the bottom to prevent
clogging. Attach float (24) to suction hose (27) using wire or rope of sufficient length to permit submerging of the
strainer.
(3)
If water at the source is 6 feet (1.8 m) deep, submerge the suction strainer approximately 3 feet (1 m)
below the surface.
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