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Stable and Unstable Centrifugal Pumps

Characteristics of stable and unstable centrifugal pumps

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For stable head-flow characteristic the differential head - h - progressively falls with increasing flow rate - q.

Centrifugal pump - stable flow

For unstable head-flow characteristic the differential head - h - rises to a maximum and then progressively falls with increasing flow rate - q.

Centrifugal pump - unstable flow

An unstable pump may start to oscillate between the two possible combinations of head-flow. The flow rate will modulate and the pipeline vibrate.

It is recommended that centrifugal pumps are designed and operated under stable conditions.

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  • en: pump characteristics stable unstable flow head pressure
  • es: características de la bomba de presión de cabeza flujo inestable estable
  • de: Pumpenkennlinien stabil instabile Strömung Kopfdruck
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