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Impeller Specific Speed­ (Ns)

The term impeller specific speed is used to­ clas­sify impellers of various types based on their performance. Specific speed is defined as that speed at which a geometrically similar pump would deliver one unit of flow to one unit of head. Input values for Flow and Head t­hat correspond to the the pump performance at optimum (or best) efficiency point. In this example, calculate the specific speed in either Metric or US units.

Flow Rate 



Specific Speed


Consolidated Pumps Ltd Knockmeenagh Road, Newlands Cross, Clondalkin, D22 AC98 Tel: +353 1 4593471 Fax: +353 1 4591093