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Enter the flow rate, head, density and pump efficiency to get hydraulic power, shaft power, the minimum motor rating with the API 610 margin and a suggested standard motor size. Defaults come from an ISO 9906 centrifugal pump benchmark.
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Results are for reference; check them against the applicable engineering codes. Everything is calculated in your browser and your inputs are not uploaded.
Inputs: Q = 180 m³/h, outlet minus inlet pressure 3.0 bar, inlet / outlet bore 150 / 100 mm, gauge elevation difference 0.4 m, ρ = 998.2 kg/m³, η = 78 %
| Total head H (from pressure, velocity and elevation differences) | 32.7 m |
|---|---|
| Hydraulic power Pᵤ | 16.01 kW |
| Shaft power P | 20.52 kW |
| Sizing factor K | 1.25 |
| Minimum motor rating K·P | 25.65 kW |
| Suggested motor size | 30 kW |
The example matches industry benchmark GC-IND-PUMP-001 in our repository (expected values derived independently with 50-digit decimals and checked by automated tests).
Hydraulic power Pᵤ = ρgQH is the power delivered to the liquid; shaft power P is what the motor delivers to the pump shaft, P = Pᵤ/η. Their ratio is the pump efficiency.
A common rule is API 610: the motor is at least 125 % of rated pump power up to 22 kW, 115 % for 22–55 kW and 110 % above 55 kW. You can also enter your own factor.
Head = static head (liquid level difference) + pressure difference expressed as head + friction and minor losses in the line. Calculate line losses with the pipe pressure drop calculator and add them.
Enter the actual density. For liquids much more viscous than water, pump performance must be corrected (e.g. ISO/TR 17766); this tool does not include viscosity correction.
Yes. Click "Save to project / export report" and create a free account; your inputs open as a new project in the workspace, where you can save and export a Word / PDF report.
Darcy–Weisbach friction loss, Reynolds number and friction factor
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