KSB Centrifugal Pump Lexicon –

From A to Z

Runaway speed

The maximum rotational speed, of the drive of a centrifugal pump is called runaway speed. It is only relevant to boiler feed pumps powered by a steam turbine.

When centrifugal pumps operate in turbine mode (as a drive or in the case of reverse flow as a result of a malfunction), they can reach runaway speed if they run at full flow (i.e. there is a pressure gradient) and no load.

  

  

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