Pump Equations Formulas Calculator
Fluid Mechanics and Hydraulics
Solving For Flow Rate or Discharge
Note: Equation for water at 68 Fahrenheit. Usually, temperature correction for water is negligible.
Inputs:
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Conversions:
water horsepower (WHP)
= 0
= 0
horsepower
total head (H)
= 0
= 0
foot
Solution:
flow rate or discharge (Q)
= NOT CALCULATED
Other Units:
Change Equation
Select to solve for a different unknown
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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