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­­Suction Specific Speed (S)

Suction Specific Speed (S) like Impeller Specific Speed (Ns) is a parameter, or index of hydraulic design describing the suction capabilities and characteristics of a given first stage impeller. Input values for Flow and NPSHR that correspond to the the pump performanc­e at optimum (or best) efficiency point. In this example, calculate the suction 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