Specific speed (US)

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  1. This calculator can be used to determine a centrifugal pump's specific speed (Ns) for a given flow rate (Q), head (H), rotational speed (N). If you enter any three of these variables as inputs, the calculator will determine the fourth variable.
  1. Flow and head values are taken at the best efficiency point.

Input 3 of 4 variables to solve for the unknown.
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SymbolVariableInputUnits
NsSpecific Speed
NRPM
QFlow Rate
HHead
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