# Pump Equations Formulas Calculator

## Fluid Mechanics and Hydraulics

Solving For Pump Efficiency Note: Equation for water at 68 Fahrenheit. Usually, temperature correction for water is negligible.

#### Inputs:

 water horsepower (WHP) wattfoot-pound/secondhorsepowerjoule/secondkilojoule/secondkilowattnewton-meter/second
 brake horsepower (BHP) wattfoot-pound/secondhorsepowerjoule/secondkilojoule/secondkilowattnewton-meter/second

#### Conversions:

 water horsepower (WHP)= 0 = 0horsepower
 brake horsepower (BHP)= 0 = 0horsepower

#### Solution:

 pump efficiency (n)= NOT CALCULATED

#### Other Units:

Change Equation
Select to solve for a different unknown
Water Horsepower Solve for water horsepower Solve for flow rate or discharge Solve for total head Solve for pump efficiency Solve for brake horsepower
Net Positive Suction Head and Cavitation Solve for NPSH - net positive suction head Solve for fluid or liquid velocity Solve for pressure at impeller inlet Solve for fluid or liquid vapor pressure Solve for specific weight of fluid or liquid Solve for the acceleration of gravity
Where
 WHP = water horsepower Q = flow rate or discharge H = total head n = pump efficiency BHP = brake horsepower NPSH = net positive suction head V = velocity of fluid or liquid p = impeller inlet pressure pv = vapor pressure of fluid or liquid SW = specific weight of fluid or liquid g = acceleration of gravity

References - Books:
1) P. Aarne Vesilind, J. Jeffrey Peirce and Ruth F. Weiner. 1994. Environmental Engineering. Butterworth Heinemann. 3rd ed.

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