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Saturday, 23 April 2011

Farm machine.. PUMPING

Power requirement & efficiency:
For a given discharge the power requirements for pumping are approximately prpotional to the static head. This head or vertical lift is usually the difference in elevation between the water surface at the source and at the outlet. Where the end of the discharge pipe is higher than the water at the outlet, the head is measured to its center. Power requirements for pumping are computed by the formula

hp= Qwh / 33000 Ep

where hp= (input) horsepower delivered to pump
Q= discharge rate, gpm
w= specific weight of water, 8.34 lb/gal
h= total head in ft ( suction + discharge)
Ep= pump efficiency as a decimal fraction

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