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Suction specific speed (US)

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OverviewAssumptions
  1. Calculate US version of suction specific speed.
  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.
Short
Long
Formula for [N_ss] = {[N] * sqrt([Q])} / {[NPSH_R]^{3/4}} Formula for [N_ss] = {[N] * sqrt([Q])} / {[NPSH_R]^{3/4}}

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Input 3 of 4 variables to solve for the unknown.Help
SymbolVariableInputUnits
NssSuction Specific Speed
NRotational Speed
QFlow
NPSHrNet Positve Suction Head Required