Hydraulic Accumulator Sizing Calculator

Inputs

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The oil volume the accumulator must deliver between the maximum and minimum pressure.
cm³
Nitrogen precharge pressure, gauge. Commonly around 80–90% of minimum system pressure.
bar
Lowest system pressure at which the required oil volume must still be available.
bar
Highest charging pressure.
bar
Use 1.0 for slow/isothermal discharge, about 1.4 for rapid/adiabatic discharge.

Results

Default result
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Required gas volume(V₀)
2,774cm³

Nominal accumulator gas volume at precharge.

Also computed

Gas volume at minimum pressure(V₁)1,575cm³

Gas volume after discharging to minimum pressure.

Gas volume at maximum pressure(V₂)2,575cm³

Gas volume when charged to maximum pressure.

Precharge / minimum pressurePass0.901

Typical precharge range.

Maximum / precharge pressure2.21

Method notes 2 notes
  • The gas law must use absolute pressure; the calculator adds atmospheric pressure to the gauge inputs before solving.
  • Use n = 1.0 for slow thermal equalisation and n ≈ 1.4 for rapid discharge. Real sizing also checks bladder limits, gas temperature and manufacturer minimum/maximum ratios.

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