Brake Horsepower

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Brake horsepower, abbreviated as BPH, is the engine's horsepower required to overcome the loss in power caused by the pump.


Brake Horsepower formula

\(\large{ BHP = \frac{ Q \; h_t  \; SG }{ 3960 \; \eta }  }\)
Symbol English Metric
\(\large{ BHP }\) = brake horsepower \(\large{\frac{lbf-ft}{sec}}\) \(\large{\frac{Btu}{s}}\)
\(\large{ Q }\) = flow rate \(\large{\frac{ft^3}{sec}}\) \(\large{\frac{m^3}{s}}\)
\(\large{ \eta }\)  (Greek symbo; eta) = efficiency \(\large{dimensionless}\)
\(\large{ h_t }\) = total head \(\large{ft}\) \(\large{m}\)
\(\large{ SG }\) = specific gravity \(\large{dimensionless}\)


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Tags: Power Equations Horsepower Equations