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Calculating Pump Efficiency

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What is the formula to calcuate the efficiency of a centrifugal pump? David
 
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There are a couple of ways. The power used by a pump is

BHp = Q*P/(1714*e) Q is the flow rate, gpm. P is the differential pressure, psi, e is the pump's efficiency as a decimal and BHp is the shaft Hp used by the pump, Hp. If you can measure those variables, you can calculate the efficiency.

 
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Another option is to measure the temperature rise across the pump. Works best with high head pumps, see thread403-22185.
 
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