Suction specific speed (US)

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  1. This calculator can be used to determine a centrifugal pump's suction specific speed (Nss) for a given flow rate (Q), suction head required (NPSHr), rotational speed (N). If you enter any three of these variables as inputs, the calculator will determine the fourth variable.
  1. Flow value is taken at the best efficiency point.
  2. Flow value is 1/2 best efficiency point flow for double suction impellers.
  3. NPSHr value is taken at the best efficiency point.

Input 3 of 4 variables to solve for the unknown.
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SymbolVariableInputUnits
NssSuction Specific Speed
NRPM
QFlow Rate
NPSHRSuction Head Required
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