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