Refer to the drawing showing two operating points for the same centrifugal pump (see figure below).
Operating point A was generated from pump performance data taken six months ago.
Current pump performance data was used to generate operating point B.
Which one of the following would cause the observed difference between operating points A and B?
A. The pump discharge valve was more open when data was collected for operating point A.
B. The pump discharge valve was more closed when data was collected for operating point A.
C. The pump internal components have worn since data was collected for operating point A.
D. The system piping head loss has increased since data was collected for operating point A.
Show Answer
Answer: C
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