A variable-speed centrifugal fire water pump is taking a suction on an open storage tank and discharging through a 4-inch diameter fire hose and through a nozzle located 50 feet above the pump.
Which one of the following will cause the pump to operate at shutoff head?
A. The fire hose is replaced with a 6-inch diameter fire hose.
B. The fire hose is replaced with a 2-inch diameter fire hose.
C. Pump speed is increased until steam formation at the eye of the pump prevents pump flow.
D. Pump speed is decreased until pump discharge pressure is insufficient to cause flow.
Show Answer
Answer: D
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