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Flow Calculations for Impellers

Flow Calculations for Impellers

Flow Calculations for Impellers

(OP)
What is the correct formula for calculating flow based on impeller dimensions and RPM?

RE: Flow Calculations for Impellers

If the pump in question is from an existing manufacturer then the pump displacement should be published.  The formula is then basically the displacement x the rpm.  However, in am impeller pump, the rpm and back pressure have a dramatic effect on the output of the pump because of the designed internal leakage.  At low rpm, a higher percentage of flow will pass by the internal passages.  At higher resistive pressures, there will also be greater internal leakage.  Therefore the output is not linear with the rpm.

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