Brake Horsepower

A water pump does not operate alone. It is driven by a motor, and electrical energy drives the motor. Brake horsepower (BHP) is the horsepower applied to the pump. The BHP of a pump equals its hydraulic horsepower divided by the efficiency of the pump. Note that neither the pump nor its prime mover (motor) is 100% efficient. Both of these units experience friction losses, and more horsepower will have to be applied to the pump to achieve the required amount of horsepower to move the water, and even more horsepower must be applied to the motor to get the job done (Hauser, 1993). The formula for BHP is:

Key Points: (1) Water horsepower (WHP) is the power necessary to lift the water to the required height; brake horsepower (BHP) is the horsepower applied to the pump; (3) motor horsepower is the horsepower applied to the motor; and (4) efficiency is the power produced by the unit divided by the power used in operating the unit.

Brake Horsepower (BHP) =

Flow (gpm) x Head (ft) x Specific Gravity 3960 x Efficiency

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