Hydraulic Fluid Velocity Calculator

Inputs

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Screening target used for the velocity verdict and required-ID result.
Oil flow through the hydraulic line.
L/min
Actual inside diameter of the hose, tube or pipe.
mm
Oil kinematic viscosity at operating temperature. ISO VG 46 oil is about 46 cSt at 40 C.
cSt

Results

Default result
Edit inputs
Oil velocity(v)
2.351m/s
Pass

At or below the pressure line screening target.

Also computed

Velocity utilization(v / v_target)Pass52.25%

52.3% of the entered/preset target velocity.

Required line ID(D_req)Pass13.73mm

Minimum actual ID to meet the selected velocity target.

Target velocity used(v_target)4.5m/s

pressure line screening target

Flow area(A)283.5mm²

Reynolds number(Re)971.2

laminar at entered viscosity

Velocity margin(v_target - v)2.149m/s

Method notes 3 notes
  • Continuity: A = pi*D^2/4 and v = Q/A. Required ID is D = sqrt(4*Q/(pi*v_target)).
  • Line-type velocity targets are first-pass screening presets. Manufacturer hose/tube data, pressure drop, suction NPSH/cavitation margin, cold-oil viscosity, noise, heat, erosion and routing details still control final selection.
  • Use the hydraulic hose pressure-drop calculator after selecting an actual hose or tube ID.

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