Hydraulics and industrial maintenance
Hydraulic power and efficiency
Explain theoretical fluid power and input demand with supplied efficiency.
Your inputs
Complete the fields for your selected method. Zero means intentionally zero, not unknown. Currency selection labels amounts; it does not convert exchange rates.
How this calculation works
fluid kW=pressure Pa*flow m3/s/1000; input=fluid/eta.
Pressure is differential pressure across the device; flow is measured. Input is mechanical shaft power, not wall electrical input. Efficiency is supplied, not certified. No safe load, working pressure or equipment selection.
What information do I need?
Use records for the same job, equipment or accounting period. Only the fields for your selected entry method are required. An unknown amount is not zero.
Input definitions and where to find them
- Measured differential pressure (psi): Measured differential pressure across the device, not safe working-pressure rating.
- Measured fluid flow (US gal/min): Measured or qualified supplier/assessment value for measured fluid flow at the SAME operating point. Do not infer equipment sizing, safe limits or missing engineering data.
- Input-to-fluid power efficiency (%): Input-to-fluid efficiency at this condition; calculated input is mechanical shaft, not wall electricity.
Use the Where to find this value controls beside the inputs for available work-it-out helpers. Estimates remain your assumptions; a helper does not verify the source figures.
Worked example
Example amounts use US dollars (USD).
Example answer: Theoretical fluid power is 10.00 kW fluid for the illustrative inputs below.
Example inputs
- Measured differential pressure: 1,450.377377302168 psi
- Measured fluid flow: 15.850323141489 US gal/min
- Input-to-fluid power efficiency: 80.00 %
- Theoretical fluid power
- 10.00 kW fluid
- Required shaft input power at stated efficiency
- 12.50 kW input
- Conversion loss
- 2.50 kW
These illustrative values are not recommended rates or industry averages. Replace every example input with your own figures.
Use the result well
Explain theoretical fluid power and input demand with supplied efficiency. Some modes require specialist measurements or a qualified equipment/energy estimate. If you do not have those inputs, use a directly measured alternative where offered; do not guess from unrelated bills or equipment ratings.
Keep inputs on the same scope and time basis. Calculations retain precision internally; displayed values generally round to two decimal places, with extra precision for very small values and whole-unit rounding where required. Economic comparisons describe your supplied assumptions and do not guarantee future results.
This tool provides business arithmetic. It does not approve engineering designs, establish legal or tax treatment, select equipment or certify safe operating conditions.