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Engineering ToolBox > Stable and Unstable Centrifugal Pumps
For stable head-flow characteristics the differential head - h - progressively falls with increasing flow rate - q.
For unstable head-flow characteristics 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.