Water from a river is to be pumped to an irrigation ditch as shown in Figure P4.43. The water temperature is 55°F. The irrigation requirement is 400 gpm. The elevation difference between the river and the surface of the water in the irrigation ditch is 30 ft. A hinged-disc foot valve with a strainer serves two functions; (1) it filters the water entering the suction pipe and, (2) it acts like a check valve when the pump is shut down. The pipeline contains 85 ft of 5-nom sch 40 commercial steel pipe. Model the foot valve as a swing check valve.

a. Plot the system curve up to 600 gpm.

b. Select a Series e-80 Bell & Gossett inline pump for this system.

c. What is the operating point of the pump/pipe system based on the pump you selected in (b)? Specify the capacity (gpm), head (ft), brake horsepower input to the pump (hp), and efficiency of the pump.

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Z=0 ft. Hinged -disc foot valve with strainer Idaho Trout L=85 ft 5-nom sch 40 Commercial steel River FIGURE P4.43 A pump/pipe irrigation system. B&G Series 80SC Inline pump Irrigation ditch Z2 = 30 ft