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To fully prevent oil leakage. #3s added as spare ring

In case of leakage, #3s seal ring is put into operation by close the line valve for #3, #3s will activate

 

In case of all seal failure,

1. Adjust LO pressure of stern tube to equal or higher then sea water pressure by changing the gravity tank position. If seawater leaking in
2. If 3 & 3S both damage, stern tube oil pressure can be lowered by adjusting tank position using temporary oil tank. If oil leaking out.

 

Changing seal in situ without going to drydock

1. Vessel trimmed forward until propeller shaft above water 
2. Staging is rigged below shaft to carry job, staging rigged 
3. Propeller robe guard remove and habitat set up around the arrangement
4. Water pumped out from enclosure
5. Isolate and drain the system
6. Service Engineer carry out job
7. Loosen the bolt holding cover ring, intermediate ring
8. Special bonding compound used to join 2 ends of new seal ring
9. Reassemble seal ring, intermediate ring, cover ring.
10. Restore lub oil system

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