Question 379Steam Plants - 1st Asst/Chief
70% to passIf a lube oil pump fails to build up discharge pressure, the cause could be the _______________.
Adischarge valve is open
Bsuction vacuum is high
Cbypass valve is closed
Dsuction valve is closed
AI Explanation
The correct answer is D) the suction valve is closed. If a lube oil pump fails to build up discharge pressure, the likely cause is that the suction valve is closed, preventing oil from being drawn into the pump. With the suction valve closed, there is no flow through the pump, and it cannot generate the necessary discharge pressure. The other answer choices are incorrect because they do not directly prevent the pump from drawing oil. A open discharge valve, high suction vacuum, or closed bypass valve would not necessarily prevent the pump from building pressure if the suction valve is open and allowing oil to flow into the pump.
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