Question 315General Subjects - QMED

70% to pass

When installing a mechanical shaft seal on a pump, it is important to _______________.

Arun the pump "dry" for initial break-in of the shaft seal
Bpolish the seating faces with emery cloth prior to assembly
Cmake the final spring collar adjustments with the pump running
Densure that correct spring pressure is applied to the seating faces
AI Explanation

The correct answer is D) ensure that correct spring pressure is applied to the seating faces. When installing a mechanical shaft seal, it is critical to ensure the correct spring pressure is applied to the seating faces. This allows the seal to properly seat and creates the necessary seal between the pump shaft and the housing. Applying the proper spring pressure helps prevent leaks and ensures the long-term reliability of the mechanical seal. The other options are incorrect: A) Running the pump "dry" during initial break-in can damage the seal faces. B) Polishing the seating faces with emery cloth is not necessary and can actually create uneven surfaces. C) Final spring collar adjustments should be made with the pump stationary, not running.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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