Refer to the pump and system curves (see figure below) for a centrifugal pump operating in a cooling water system.
Operating point A existed when data was taken six months ago.
Operating point B is the current operating point.
Which one of the following could be responsible for the difference between the operating points?
A. The pump discharge valve was more open when the data was collected for operating point A.
B. The pump discharge valve was more closed when the data was collected for operating point A.
C. The pump was rotating faster when the data was collected for operating point A.
D. The pump was rotating slower when the data was collected for operating point A.
Show Answer
Answer: D
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