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The performance characteristics of a certain centrifugal pump are determined from an experimental setup similar to that shown in Fig. 12.10. When the flowrate of a liquid (SG = 0.9) through the pump is 120 gpm, the pressure gage at

(1) indicates a vacuum of 95 mm of mercury and the pressure gage at

(2) indicates a pressure of 80 kPa. The diameter of the pipe at the inlet is 110 mm and at the exit it is 55 mm. If z₂ - z₁= 0.5 m, what is the actual head rise across the pump? Explain how you would estimate the pump motor power requirement.

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