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affinity laws brake horsepower cavitation centrifugal pump CONDENSED DATA PRESENTATION Cornell University data computation diameter differential head versus discharge flange Dissipation N Eff ED(P ED(t Efficiency versus flow energy dissipation expressed in feet expressed in pounds Figure 15 Fischer and Porter gravimetric scale gravimetric tank head of 50 horsepower is greater hydraulic machine impeller inches Karman Knapp circle diagram Magnetic Flow Meter manom manometer tap expressed negative speeds normal pump operation normal turbine operation obtained during reverse Operation Number plot pump and turbine pump efficiency pump shaft Q H Type Quadrant rate in normal Reverse speed pump reverse turbine operation Reverse turbine RP revolution counter RPM BHP cfs Run RPM BHP specific speed speed pump operation supply pump tachometer test pump timer and revolution torque versus flow total differential head Type of Run versus flow rate water horsepower zone of energy zone of normal zones of operation