### Pumps, Fans and Turbines - Horsepower

H = Head height, ft = Efficiency coefficient. Horsepower Required to Drive Hydraulic Pump . HP = GPM X PSI X .0007 (this is a 'rule-of-thumb' calculation) Where: GPM = Gallonsper Minute PSI = Pounds per Square Inch .0007 = Rule of Thumb Constant for Power HP = Horse Power #2 Horsepower required to Drive a Hydraulic Pump . P HP = q p 1714 . where

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