Hydraulic Reservoir Size Calculator

Inputs

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Total pump flow returning to the tank.
L/min
Target oil residence time in the reservoir. Three minutes is a common screening start.
min
Fraction of total tank volume normally filled with usable oil, leaving air space above.

Results

Default result
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Usable oil volume
120,000cm³

Also computed

Nominal tank volume150,000cm³

Includes headspace above the normal oil level.

Tank turnovers per minutePass0.267

3 min residence target.

Method notes 3 notes
  • This is a residence-time sizing check: usable oil volume = pump flow × minutes in tank.
  • Final reservoir size also depends on heat load, return-line aeration, cylinder volume change, sloped bottoms, baffles, suction head and fluid expansion.
  • Use a smaller usable fraction when you need more headspace for foaming, expansion or sloshing.

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