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Centrifugal Pumps - Stable and Unstable Flow

The characteristics of stable and unstable flow.

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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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  • Engineering ToolBox, (2006). Centrifugal Pumps - Stable and Unstable Flow. [online] Available at: https://www.engineeringtoolbox.com/stable-centrifugal-pumps-d_674.html [Accessed Day Mo. Year].

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