How to size an accumulator?

Determine required oil volume ΔV and pressure range. Use gas law to find total gas volume V₀ at precharge.

Isothermal vs adiabatic?

Isothermal (P₁V₁=P₂V₂) for slow processes. Adiabatic (P₁V₁ᵞ=P₂V₂ᵞ, γ=1.4) for fast discharge.

What precharge pressure?

Bladder: P₀ = 0.9 × P_min. Piston: P₀ = 0.95 × P_min. Never exceed min system pressure.

Bladder vs piston type?

Bladder: fast response, compact. Piston: higher flow, better for slow cycling. Diaphragm: small volumes.

How often to check precharge?

Every 3-6 months. Nitrogen slowly permeates through the bladder. Use dry nitrogen only.

Free Engineering Tool

Hydraulic Accumulator Calculator

Gas precharge sizing. Isothermal: P₁V₁ = P₂V₂. Adiabatic: P₁V₁ᵞ = P₂V₂ᵞ. Calculate required accumulator volume.

IsothermalAdiabaticGas Precharge

Results

Required Accumulator Volume

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Gas Volume at P₁ (min)

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Gas Volume at P₂ (max)

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Usable Oil Volume

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Process

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Gas Law

γ = 1.4 for nitrogen. Isothermal for slow processes (>1 min). Adiabatic for fast (<1 min).

Precharge rule: P₀ = 0.9 × P₁ (min system pressure) for bladder accumulators.

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