<Dl> <Dd> P i = ρ g H Q η (\ displaystyle P_ (i) = (\ cfrac (\ rho \ g \ H \ Q) (\ eta))) </Dd> </Dl> <Dd> P i = ρ g H Q η (\ displaystyle P_ (i) = (\ cfrac (\ rho \ g \ H \ Q) (\ eta))) </Dd> <Dl> <Dd> P i (\ displaystyle P_ (i)) is the input power required (W) </Dd> <Dd> ρ (\ displaystyle \ rho) is the fluid density (kg / m) </Dd> <Dd> g (\ displaystyle g) is the standard acceleration of gravity (9.80665 m / s) </Dd> <Dd> H (\ displaystyle H) is the energy Head added to the flow (m) </Dd> <Dd> Q (\ displaystyle Q) is the flow rate (m / s) </Dd> <Dd> η (\ displaystyle \ eta) is the efficiency of the pump plant as a decimal </Dd> </Dl> <Dd> P i (\ displaystyle P_ (i)) is the input power required (W) </Dd>

The discharge of a centrifugal pump is given by
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