The centrifugal pump shown in Figure E19.20 is used to supply water to a storage tank. The pump inlet is at atmospheric pressure, and water is pumped up to the storage tank, which is open to atmosphere, via large-diameter pipes. Because the pipe diameters are large, the frictional losses in the pipes and any change in fluid velocity can be safely ignored.

If the storage tank is located at an elevation of 35 m above the pump, predict the flow using each impeller.

If the storage tank is located at an elevation of 50 m above the pump, predict the flow using each impeller.

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Head (m) 90 80 70 60 50 40 30 20 10 T L T 1 1 7,in. 2. 0 0.2 0.4 0.6 0.8 8 in. DP 6 in. Speed: 3500 rpm Impeller Sizes: 6, 7, 8 in. Flowrate, v (m³/min) 1.0 1.2 1.4 1.6 1.8 2.0 2.2 "2" b-b Centrifugal Pump a-a