Swivel Joint Calculator

Calculate rotary union sizing for rotating hydraulic applications with seal life estimates

Input Parameters

Results

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Fluid Velocity
ft/s
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Pressure Drop
psi
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Seal PV Factor
psi·ft/min
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Est. Seal Life
hours
Note: PV factor should be below 500,000 psi·ft/min for standard lip seals. PTFE seals allow higher PV.

Reference

PV Factor = Pressure × π × d × RPM / 12 | Seal Life ∝ 1/PV