KEVOS® MAKEOS · Hydraulics
Hydraulic Power and Pump Input
What fluid power and shaft input does this duty require?
Calculate hydraulic power from differential pressure and delivered flow, with an entered overall pump efficiency.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Pressure rise | bar | Pump outlet minus inlet pressure under the specified duty. |
| Delivered flow | L/min | Actual delivered flow at the stated pressure. |
| Overall pump efficiency | % | Combined volumetric and mechanical efficiency at this duty, from supplier data. |
Method and formulas
- Fluid power (kW) = pressure rise (bar) × flow (L/min) / 600.
- Shaft input = fluid power / (efficiency / 100).
- Pump loss = shaft input − fluid power. Example: 150 bar and 20 L/min gives 5 kW fluid power, 5.882353 kW shaft input at 85%, and 0.882353 kW pump loss.
Limitations
- Efficiency is specific to the pump and operating point; the default is illustrative.
- Loss here excludes downstream throttling and motor electrical losses. It is not total system cooling demand.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- pump power
- hydraulic kW
- pump loss
Who it is for
- Designers
- Maintenance engineers
What you get
- Hydraulic power
- Pump shaft input
- Estimated pump loss
Interpreting the result
- Size the motor and cooling system for the full duty cycle and additional losses.
References
- Machinery’s Handbook, 29th edition (Industrial Press, 2012), printed pp. 186, 365–368; CD pp. 3416–3420. Topic reference; no source tables or recommended settings are reproduced.
- Parker: Basic Hydraulic Formulas — https://www.parker.com/content/dam/Parker-com/Literature/Accumulator---Cooler-Division---Americas/Catalogs---Bulletins/GAD-HY10-1630-5-2012/ACD_CoolerCatalog_HY10_1700.pdf
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