The pump having the characteristics shown in Problem 14.14 is to be operated at 800 rpm. What discharge rate is to be expected if the head developed is 410 m?

Data From Problem 14.14

Performance curves for an operating centrifugal pump are shown below in both conventional units and in dimensionless form. The pump is used to pump water at maximum efficiency at a head of 90 m. Determine, at these new conditions, (a) the pump speed required and (b) the rate of discharge.

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6. CH 1.00 Efficiency, n 0.75 Cp 3 0.50 0.25 0.04 0.08 0.12 0.16 Co dɔ u 250 100 200 80 Efficiency Power input 150 60 Нead 100 40 360 грm 50 d = 39 cm 0.05 0.10 0.15 0.20 0.25 Discharge, m³/s Head, m; Power, kW 20 Efficiency, %