Servi – Hydraulic Calculator

Accumulator sizing P·Vⁿ = const

Precharge pressure (P0)

bar

Min system pressure (P1)

bar

Max system pressure (P2)

bar

Required oil volume ΔV

Polytropic exponent (n)

–

Safety factor

Hydraulic motor

Flow (Q)

L/min

Displacement (D)

cc/rev

Pressure drop (ΔP)

bar

Volumetric efficiency (ηv)

0–1

Mechanical efficiency (ηm)

0–1

Overall efficiency (ηo)

0–1

Pump sizing

Pump displacement

cc/rev

Pump speed (n)

rpm

Volumetric efficiency (ηv)

0–1

Pressure (ΔP) (optional)

bar

Cylinder force & speed

Bore diameter

Rod diameter

Pressure

bar

Flow (for speed)

L/min

Stroke (optional)

Efficiency (optional)

0–1

Piping

Oil flow

L/min

Inside pipe diameter

Viscosity

cSt

Pipe length

Shock dampening (approx.)

Working pressure

bar

Max allowed pressure increase

bar

Uses pipe volume and a typical oil bulk modulus to estimate the oil volume that must be absorbed.