Refer to the drawing of an operating cooling water system (see figure below).
The pump discharge valve is partially throttled to produce the following initial pump operating parameters:
Pump discharge pressure = 45 psig
Pump suction pressure = 15 psig
Pump flow rate = 120 gpm
After a few hours of operation, the current pump operating parameters are as follows:
Pump discharge pressure = 48 psig
Pump suction pressure = 18 psig
Pump flow rate: = 120 gpm
Which one of the following could be responsible for the change in pump operating parameters?
A. The pump speed increased with no other changes to the system.
B. The surge tank level increased with no other changes to the system.
C. The pump discharge valve was closed further while pump speed increased.
D. The pump discharge valve was closed further while surge tank level increased.
Show Answer
Answer: B
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