Hydraulic, Pneumatic & Fluid Power Systems worked example

Reservoir Sizing with pump flow rate of 50 units: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop pump flow rate to 50 units, then walk the calculation through step by step. Calculate reservoir sizing for hydraulic, pneumatic & fluid power systems planning, quoting, troubleshooting, capacity review, or process improvement.

The inputs for this scenario

  • Pump flow rate (GPM): 50 units (the input this scenario stresses; the baseline uses 100)
  • Reservoir holdup time (minutes): 4 units (held at the documented default)
  • Volume unit conversion factor: 0.01 x (held at the documented default)
  • Thermal / process derating multiplier: 1 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Reservoir Sizing = first factor × second factor × conversion factor × process multiplier.
  • Result works out to 1 units at these inputs, and this is the headline figure for the scenario.
  • Base product works out to 1 value at these inputs.
  • Multiplier works out to 1 x at these inputs.
  • Factor A x B works out to 200 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where pump flow rate sits at 100 units and the headline result is 2 units, this scenario comes in 50% below the baseline at 1 units.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to pump flow rate, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It is a volumetric estimate only; it does not size for cooling capacity, baffle layout, or NPSH at the pump suction, which may demand a larger tank than volume alone suggests.

Results at a glance

  • Result: 1 units (headline result)
  • Base product: 1 value
  • Multiplier: 1 x
  • Factor A x B: 200 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Reservoir Sizing calculator, set pump flow rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.