A section of pipe is being hydrostatically tested to 1,400 psig using a positive displacement pump.
The operating characteristics of the positive displacement pump are shown in the drawing below.
Which one of the following could cause the difference between the expected and the actual pump performance?
A. Pump internal leakage is greater than expected.
B. Pipe section boundary valve leakage is greater than expected.
C. A relief valve on the pump discharge piping opened prior to its setpoint of 1,400 psig.
D. The available NPSH is smaller than expected, but remains above the required NPSH.
Show Answer
Answer: A
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