Pump Efficiency

Pump efficiency, abbreviated as \(\eta_p\) (Greek symbol eta), is the ratio of total horsepower output to shaft horsepower input of the pump or power output to power input.

 

Pump Efficiency formulas

\(\large{ \eta_p = \frac{ \rho \; G \; Q \; h }{ P } }\)
\(\large{ \eta_p = \frac{ WHP }{ BHP } }\)

Where:

\(\large{ \eta_p }\)  (Greek symbol eta) = pump efficiency

\(\large{ BHP }\) = brake horsepower

\(\large{ \rho }\)  (Greek symbol rho) = density of fluid

\(\large{ Q }\) = flow rate

\(\large{ h }\) = head

\(\large{ P }\) = power input

\(\large{ G }\) = universal gravitational constant

\(\large{ WHP }\) = water horsepower