Refer to the pump performance curves for a centrifugal cooling water pump (see figure below).
The pump is being driven by a single-speed AC induction motor.
Pump flow rate is being controlled by a throttled discharge flow control valve.
The following initial pump conditions exist:
Pump motor current = 50 amps
Pump flow rate = 400 gpm
What will be the approximate value of pump motor current if the flow control valve is repositioned such that pump flow rate is 800 gpm?
A. Less than 100 amps
B. 200 amps
C. 400 amps
D. More than 500 amps
Show Answer
Answer: A
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