Pumping System Efficiency Calculator

The "Pumping System Efficiency Calculator" can be used to determine the overall "wire-to-water" efficiency of your pumping plant and to determine the mechanical efficiency of an electric motor-driven centrifugal pump served by a three-phase power supply. To use this calculator you must:
  • Measure pump discharge pressure (in psig)
  • Measure pump suction pressure (in psig) or sound your well to determine pumping water level and static lift (in feet)
  • Measure pump flow (in gpm)
  • Determine column friction head losses (in feet)
  • Enter the specific gravity of the liquid being pumped
  • Enter the horsepower, synchronous speed, full-load efficiency and enclosure type for your pump drive motor, and
  • Measure the input power to your pump motor.
The wire-to-water efficiency of your pumping plant is the ratio of the water horsepower provided by your pumping plant---which is proportional to the amount of water or other fluid being delivered (in gpm) at your operating pumping head (in feet)---divided by the electrical power supplied to the pump drive motor (input kW are converted into input hp). The greater your overall efficiency is, the lower your overall pumping costs will be. Another useful performance indicator is the quantity of water delivered (in gallons) per kWh of electrical energy consumed.

Efficiency tests assist pumping plant operators to identify inefficient systems, to schedule pumps, determine energy efficiency improvement measures, and to estimate potential energy savings. Efficiency tests are usually scheduled on larger pumps that operate for extended periods of time.

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