- This calculator can be used to determine the mechanical efficiency (ηp) of a centrifugal pump, assuming it is directly driven by an electric motor. To use this calculator you must be able to:
- measure pump suction and discharge pressure
- measure pump flow
- measure motor power
- know the mechanical efficiency (ηm) of the electric motor
- Note: If the electric motor is operating at partial load, make sure you use its efficiency corresponding to actual load condition.
- All data is taken at the same pump conditions, i.e. flow, pressures, and speed.
- Electric motor efficiencies at full and partial loads are known.
- Viscosity correction for the pumped fluid is not required.