Allied Equipment Company is happy to provide these valuable tools for your use. Check back often for updated formulas.

PUMP Brake Horse Power (water)

BHP =  GPM x head
3960 x Eff

BHP - = brakehorse power

Head = pressure differential in feet

Eff = Efficiency as a decimal (ie. 80% is 0.8)

Heat Transfer (water)

Q = 500 x GPM x δT

Q = Heat transfer (Btu/hr)

GPM = flow rate in gallons per minute

δT = temperature rise or drop of water (F)

Formula is for WATER


1 gallon of water = 8.33 pounds

1 psi = 2.31 feet