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Stern tube seal renewal procedure in-situ?
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Engr. Shafiul Bari
Shafiul Bari is a seasoned Marine Engineer with extensive experience in ship design, maintenance, and marine propulsion systems. With a deep technical knowledge of ship engineering and a passion for advancing maritime technology, Shafiul shares practical insights and expert advice to help marine professionals and enthusiasts better understand the complexities of ship systems. Through his website, he aims to bridge the gap between technical theory and real-world application, fostering a community of informed and skilled maritime engineers.
When not immersed in ship engines and technical manuals, Shafiul enjoys exploring the latest innovations in marine technology and mentoring aspiring marine engineers.
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Stern Tube Seal Renewal Procedure In-Situ
Preparation and Safety Measures
- Report damage or incident to the office with a list of available spare seals onboard
- Check and requisition Environmentally Acceptable Lubricants (EAL) for stern tube oil if needed
- Company will arrange a diving team and surveyor
- Prepare previous wear down records, survey records, and LO analysis reports for the service team
- Discuss underwater permits and checklists with the service technician
Safety Precautions
- Isolate the main engine and engage the turning gear
- Implement lockout and tag out procedures on turning gear, Engine Control Room (ECR), and bridge telegraphs
- Place warning stickers indicating “DIVING OPERATION IN PROGRESS/ MEN AT WORK UNDER WATER-DO NOT START ENGINE OR ROTATE PROPELLER”
- Stop and lock out Marine Growth Prevention System (MGPS) and Impressed Current Cathodic Protection (ICCP)
Procedure Execution
Preparation:
- Trim the vessel forward until the propeller shaft is above water
- Isolate and drain the system
- Set up staging below the shaft and remove the propeller rope guard
- Establish a habitat around the work area and pump out water from the enclosure
Seal Renewal Steps:
- Loosen bolts holding the cover ring and intermediate ring
- Use special bonding compound to join the ends of the new seal ring
- Reassemble the seal ring, intermediate ring, and cover ring
Post-Renewal:
- Restore the lube oil system
- Conduct a leak test
- Send a service report to the office along with the surveyor’s report
Post-Procedure Monitoring
Add the following instructions to the Chief Engineer’s Night Order Book for watchkeepers:
- Monitor oil levels regularly
- Monitor stern tube temperature
- Check drain collection unit regularly
- Call the Chief Engineer if there are any doubts
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