ToolnozaENGINEERING TOOL
Hydraulic Accumulator Sizing Calculator
Estimate gas accumulator nominal volume for a required fluid delivery between minimum and maximum pressure.
Hydraulic Accumulator Sizing Calculator
FREE ONLINE TOOLSTEP BY STEP
How to use hydraulic accumulator sizing calculator
- Check the input units and assumptions.
- Review the result and example.
IN PRACTICE
Example
ΔV = 10 L; P0 = 90 bar(g); Pmin = 100 bar(g); Pmax = 200 bar(g); Pambient = 1 bar(a); n = 1 → V0 = 22.31 L.
GOOD TO KNOW
Why add ambient pressure?
The gas law uses absolute pressure. Applying it directly to gauge values gives an incorrect volume, especially at low pressure.
Formula and worked example
Pabs = Pgauge + Pambient; V0 = ΔV/[(P0/Pmin)^(1/n) − (P0/Pmax)^(1/n)].
ΔV = 10 L; P0 = 90 bar(g); Pmin = 100 bar(g); Pmax = 200 bar(g); Pambient = 1 bar(a); n = 1 → V0 = 22.31 L.
How to interpret the result
The calculated nominal volume is the gas space at precharge, before hydraulic fluid enters. Delivered fluid is the difference between gas volumes at the minimum and maximum operating pressures.
The exponent represents the assumed thermal response: n = 1 is isothermal and n near 1.4 approximates rapid nitrogen compression. Actual charging and discharge may need different exponents and temperature corrections.
Frequently asked questions
Why add ambient pressure?
The gas law uses absolute pressure. Applying it directly to gauge values gives an incorrect volume, especially at low pressure.
What assumptions limit this calculation?
Ideal gas-volume estimate only; 1 ≤ n ≤ 1.4. Requires precharge below minimum pressure. Does not check bladder compression ratio, discharge rate, temperature correction, real gas behavior or vessel rating. Final selection requires manufacturer sizing.
How to Calculate Hydraulic Accumulator Sizing: Formula & Example