A Bell & Gossett Series e-1531 end-suction pump is to be selected for the system shown in Figure P4.42. The system is designed to move water at 60°F from the lower tank to the upper tank. The system must deliver a minimum of 500 gpm of water from the lower tank to the upper tank when the pump is operating. A tilting disc check valve (α = 5°) is used to prevent the water from flowing backward when the pump is shut off. The total length of straight pipe in this system is 150 ft. The pipe is 4-nom sch 40 commercial steel.

a. Plot the system curve up to 800 gpm.

b. Select a Series e-1531 Bell & Gossett 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 =6 ft FIGURE P4.42 Two tank pump and pipe system. Tilting disc check valve a=5 #N+ B&G Series e-1531 End suction pump L = 150 ft 4-nom sch 40 Commercial steel Z=30 ft