Refer to the drawing of a cooling water system in which only centrifugal pump A is operating and the common pump discharge valve is currently 90 percent open (see figure below).
An abnormal total heat load on the cooling water system is causing pump A to approach operation at runout conditions.
Which one of the following will cause pump A to operate further away from runout conditions?
(Assume that satisfactory available net positive suction head is maintained at all times.)
A. Starting pump B.
B. Raising the water level in the surge tank by 2 feet.
C. Decreasing heat exchanger service water flow rate by 10 percent.
D. Positioning the common pump discharge valve to 100 percent open.
Show Answer
Answer: A
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