What action to be taken in case of stern tube lube oil water contamnation?

In the event of stern tube lube oil water contamination, the following actions should be taken:

1. Immediate Action:

- Stop the propulsion system and secure the vessel.

- Isolate the affected stern tube from the rest of the lubrication system.

- Check the level of water contamination in the lube oil system using the sight glass or dipstick.

- Notify the Chief Engineer and relevant personnel.

2. Assessment:

- Determine the source of water contamination. This can be done by visually inspecting the stern tube seals and the surrounding area for leaks.

- Check for any damage or wear to the stern tube bearings, seals, or propeller shaft.

3. Water Removal:

- Drain the contaminated lube oil from the affected stern tube.

- Flush the stern tube with clean lube oil to remove any remaining water.

- Repeat the draining and flushing process until the oil appears free from water contamination.

4. Lubrication System Maintenance:

- Replace the contaminated lube oil with new oil of the recommended grade and viscosity.

- Inspect and clean the lube oil filter and replace it if necessary.

- Check the oil pressure and temperature and ensure they are within the recommended ranges.

5. Repair and Inspection:

- If the source of the water contamination was identified as a seal failure, replace the affected seals with new ones.

- Inspect the propeller shaft and bearings for any damage or wear. Conduct any necessary repairs or replacements.

6. Documentation:

- Record all actions taken, observations, and measurements in the ship's logbook and maintenance records.

- Report the incident to the appropriate authorities or classification societies, if required.

7. Preventive Measures:

- Implement regular inspections and preventive maintenance of the stern tube seals and lubrication system.

- Monitor lube oil condition regularly and take prompt action if any abnormalities are detected.

- Ensure proper ventilation and temperature control in the stern tube area to prevent condensation.

By following these steps, the consequences of stern tube lube oil water contamination can be mitigated, ensuring the safety and reliability of the vessel's propulsion system.