What is the purpose of the relief valve located between the pump outlet and the discharge isolation valve of many positive displacement pumps?
A. Protect the pump and suction piping from overpressure if the discharge valve is open during system startup.
B. Protect the pump and suction piping from overpressure if the suction valve is closed during pump operation.
C. Protect the pump and discharge piping from overpressure if the discharge valve is closed during pump operation.
D. Protect the pump and discharge piping from overpressure due to thermal expansion of pump contents when the pump is stopped with its suction valve closed.
Show Answer
Answer: C
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