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answered Nov 11, 2014 by Normandy (21,040 points)

Equations for horsepower and brake horsepower are taken from the GPSA (Gas Processors Supplier Association) Databook.

hp = (Q * H * S.G) / 3960

bhp = hp / e

Where:

Q: Flow rate (GPM)
H: Differential head (ft)
S.G.: specific gravity
e: 
efficiency

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