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Positive Displacement

Pump Slip

Slip and Efficiency

A major effect on positive displacement pump performance is the loss in flow due to slip. The expanding cavity on the inlet side of a positive displacement pump creates a low pressure area that asks to be filled with fluid. This cavity can be filled with fluid from the inlet line in normal performance. However, if slip occurs, the cavity will also be partly filled with fluid flowing back through the pump clearances from the outlet side.

Pump performance is dependent on the slip which occurs in a pump.
Slip

Slip Increases
Directly with Pressure

Slip

Slip Increases
Directly with Clearance

Slip

Inversely with Viscosity

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