Which of the following actions, pertaining to saltwater lubricated stern tube stuffing boxes, is usually observed when the ship is expected to be in port for an extended period?
• Saltwater-lubricated stern tube stuffing box function and purpose • Effects of long idle periods in port on shaft, packing, and corrosion • Normal vs. special procedures for in-port lay-up compared to underway operation
• Ask yourself: When the shaft is not turning for a long time, what is the biggest risk to the stern tube and packing: overheating, leakage, or corrosion? • Which option describes a condition you would want to maintain for days or weeks without constant attendance by the watch? • Think about what continuous flushing or tightening would do to stationary packing and shaft surfaces over a long period.
• Verify which action minimizes risk of shaft scoring or packing damage when the shaft is not rotating. • Check which choice would most likely prevent seawater from entering the ship if something fails while unattended. • Consider which action is normally taken only when the ship is operating or shortly after stopping, versus a condition you’d leave it in for an extended lay-up.
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