# Pump Horsepower

Written by Jerry Ratzlaff on . Posted in Pump

Pump horsepower, abbreviated as $$PHP$$, is a measure of power or the rate of doing work.

## Pump Horsepower formulas

 $$\large{ PHP = \frac{ Q \;\Delta P}{1715 \;\eta_p } }$$ $$\large{ PHP = \frac{ 0.0002525}{ \eta_p } \; Q \; H }$$ $$\large{ PHP = \frac{ Q \; H \; SG }{ 3960 \;\eta_p } }$$

### Where:

$$\large{ PHP }$$ = pump horsepower

$$\large{ Q }$$ = flow rate (GPM)

$$\large{ H }$$ = head

$$\large{ \Delta P }$$ = pressure added (discharge minus suction), psig

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

$$\large{ SG }$$ = specific gravity

### notes

The expression can be rearranged to obtain $$\Delta P$$ in terms of other variables.