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BEP - Best Efficiency Point - Pump

Pump efficiency design

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A practical pump will never be able to convert all its kinetic energy to pressure energy. Parts of the energy will always be internal or external lost. 

Internal Losses

  • hydraulic loss - due to disk friction in the impeller, rapid change in flow directions and velocity changes throughout the pump
  • volumetric loss - due to internal re-circulation caused by wear in rings and bushes

External Losses

  • mechanical loss - due to friction in seals and bearings

BEP - Best Efficiency Point

The maximum efficiency for a pump is normally in its "design point" - also called

  • BEP - or the "Best Efficiency Point"

For pumps operating in all other positions - the efficiency will be less than in BEP.

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