Desalination & Membrane Water Treatment Equipment worked example

Pump Energy Cost at 58% pump duty share included: a worked example

Suppose pump duty share included falls to 58%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate high-pressure, feed, booster, or transfer pump energy cost for desalination and membrane treatment based on treated volume and energy cost per unit volume.

The inputs for this scenario

  • Treated water volume: 100 m³ (held at the documented default)
  • High-pressure pump energy cost per m³: 45 $ / m³ (held at the documented default)
  • Pump duty share included: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed demand or standby charge: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Included variable pump energy cost = treated water volume × pump energy cost per volume × pump duty share included.
  • Total pump energy cost works out to 2,860 $ at these inputs, and this is the headline figure for the scenario.
  • Pump energy cost per m³ works out to 28.6 $ / piece at these inputs.
  • Included variable pump energy cost works out to 2,610 $ at these inputs.
  • Fixed demand or standby charge works out to 250 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where pump duty share included sits at 80% and the headline result is 3,850 $, this scenario comes in 25.71% below the baseline at 2,860 $.
  • It computes the variable pump energy cost for the treated volume, scales it by the duty share included, and adds the fixed demand charge to give a total. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Total pump energy cost: 2,860 $ (headline result)
  • Pump energy cost per m³: 28.6 $ / piece
  • Included variable pump energy cost: 2,610 $
  • Fixed demand or standby charge: 250 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Pump Energy Cost calculator, set pump duty share included to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.