A pump takes suction from the bottom of a full, 90-ft diameter, 3 million gallon

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A pump takes suction from the bottom of a full, 90-ft diameter, 3 million gallon water(2) storage tank through a 40-ft section of 6-inch (C=80) pipe that has negligible minor head losses. The pump is at the same elevation as the bottom of the tank. When it is delivering 2 ft3/sec, the manufacturer requires a NPSH = 35-ft. (a) Prove that the pump is not cavitating when the tank is full, and (b) calculate how long it will take before the pump starts to cavitate as it pumps down the tank. (Ans: t = 2.05 days)

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