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UDC 621.671

LEZNOV B. S., Vorobiev S. V.

The operation of centrifugal pumps with variable speed

Summary

The technologic aspects of using variable speed drives in pumping units are considered. The operation of centrifugal pumps with variable speed of the impeller is analyzed with account of the impact produced by water mains characteristics on the working parameters of pumping units. It is shown that reducing the pump impeller rotation speed can in some cases result in cavitation, surging, pump rotation speed resonance and resonance of the free lateral vibration of the shaft. Possible pump operation with rotation speed higher than the rated value is considered.

Key words

adjustable electric drive , centrifugal pump , variable speed , pump moment resistance

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