8.47 Cooling water is pumped from a reservoir to rock drills on a construction job using the pipe system shown. The flow rate must be 600 gpm and water must leave the spray nozzle at 120 ft s. Calculate the minimum pressure needed at the pump outlet. Estimate the required power input if the pump efficiency is 70 percent.

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Pump Pipe, D = 4 in. (aluminum) Total length: L= 700 ft Joints: 15, each with Kjoint = 1 -Gate valve, open V; = 120 ft/s 400 ft