Two Bell & Gossett Series e-80 2x2x7B pumps operating at 1750 rpm with 6.5- inch impellers are connected in parallel. A third pump, a Bell & Gossett Series e-80 2x2x7B pump operating at 3500 rpm with a 6-inch impeller is connected in series with the parallel pumps as shown in Figure P4.49. This composite pump combination is connected to a pipe system. For this pipe system, at a flow rate of 160 gpm, the head required is 140 ft. There is a 10 ft elevation difference from inlet to outlet.

a. Construct a plot showing the individual parallel pump performance curves, the combined parallel pump curve, the individual series pump performance curve, and the composite pump performance curve.

b. Overlay the system curve on the plot developed in part (a) and determine the operating point (capacity and head) of the composite pump and pipe system.

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B&G Series e-80 2x2x7B @ 1750 rpm 6.5 inch impeller FIGURE P4.49 Three pump parallel/series configuration. B&G Series e-80 2x2x7B @ 3550 rpm 6 inch impeller