Question 190General Subjects - 1st Asst/Chief
70% to passThe shipyard has just reassembled an overhauled centrifugal pump. On testing, water is coming from the mechanical seal area. Which of the following are likely reasons for the leakage?
AThe shaft o-ring was not installed.
BThe pump was started with the discharge valve closed.
CThe pump was started with the suction valve closed.
DThe pump was air bound.
AI Explanation
The correct answer is A) The shaft o-ring was not installed. The mechanical seal on a centrifugal pump is a critical component that prevents water from leaking out of the pump casing. If the shaft o-ring that seals the mechanical seal was not properly installed during the reassembly, it would allow water to leak from the seal area, as observed during testing. The other options are incorrect because: B) Starting the pump with the discharge valve closed would not cause leakage from the mechanical seal, C) starting with the suction valve closed would not affect the mechanical seal, and D) air binding would not directly lead to a mechanical seal leak.
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