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TM 10-4320-316-14
SECTION III. PRINCIPLES OF OPERATION
1-12. THEORY OF OPERATIONS. The DED pump assembly is a self contained, transportable, diesel engine driven
centrifugal pump unit designed for pumping water. It consists of a self-priming pump, a four stroke air cooled diesel
engine, and a sound enclosure for noise reduction. The pump assembly performs its pumping operations in the following
manner (Refer to Figure 1-2).
a. Pumping Capability. The pumping capability of the DED pump assembly is provided by the pump unit contained
within the assembly. This pump is a centrifugal type pump which means that it provides its pumping action by using an
internal rotating impeller to sling the water from the center of the impeller to the outer edges of the impeller as it rotates.
This throwing action, technically known as centrifugal force, causes a vacuum in the inlet pipe of the pump to draw more
water into the pump. The water which has been forced to the outer edges of the impeller are further forced into the outlet
pipe of the pump to eventually leave the pump unit.
b. Diesel Engine. To cause the impeller inside the pump to rotate, the impeller shaft is connected to the output shaft
of a diesel engine. This diesel engine is equipped with a manual recoil starter for starting the engine and a throttle
control assembly to control the engine speed. When the maximum rated capacity of 65 GPM is required of the pump
assembly, this throttle control is set to maximum to cause the engine to rotate at maximum rpm. When a pumping rate
less that 65 GPM is required of the pump assembly, the diesel engine throttle control is adjusted to reduce the engine
rpm until the lower rate of water to be pumped by the unit is achieved.
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