Once the vessel enters the dry dock for hull inspection, it is important that the ship’s engineer secure the ship’s propulsion plant and the engine room in the correct sequence to prevent any kind of damage or problem while restarting the plant once the dry-docking of the vessel is finished.
Following points must be considered once the ship enters the dry dock and before emptying the water from the dock to rest the ship on the keel blocks:
1. Ensure all the tanks in the engine room are at required level as demanded by the chief officer to achieve required trim for docking.
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2. Shut down all the auxiliary engines except one for providing the required power
3. Isolate the sequential start system for generators
4. Shut steam to jacket cooling water system
5. Keep the jacket cooling water pump running until the main engine is gradually cooled down
6. Transfer the main engine lube oil in the sump to lube oil settling tank by using a purifier
7. Ensure all auxiliary engines are shut down except one diesel engine supplying enough power
8. Before shutting down all the auxiliary engines, ensure they are changed over to diesel oil
9. The main engine should be changed over to diesel oil prior to one hour of docking. If not, change over to diesel oil with fuel oil service tank return valve open until the line has been flushed with diesel oil
10. Shut down lube oil and fuel oil purifiers
11. Shut down deck machinery system and isolate it from the main switchboard
12. Shut down and isolate the auxiliary boiler. Allow it to cool naturally and once the pressure is below 1 bar, open the vent
13. Once the boiler is shut down, stop and isolate the feed water system and distillate tank
14. Circulate diesel oil in the boiler fuel pipeline system before shutting down the fuel oil pumps
15. Shut down the stern tube lube oil system and if required, drain the lube oil system back to stern tube storage tank
16. Shut down the accommodation air conditioning system and refrigeration plant until the shore supply is connected to the ship
17. Shut the steam to the calorifier and switch on the electrical heating system
18. Ask shore in-charge for water connection required for running air conditioning and refrigeration system
19. Isolate ship’s fire pump and connect the shore fire connection to ship’s fire line
20. Check the frequency, voltage and phase sequence of the shore power
21. Isolate the emergency generator before connecting shore power
22. Shut down the running generator leading to blackout for connecting shore power
23. Connect the shore power to emergency switchboard
24. Restart the jacket water pump for the generator until it is gradually cooled down to avoid thermal stresses. Once cooled, shut the pump
25. Secure the engine room fire fighting system including foam and CO2 fixed fire fighting system
Inform the dry dock in charge that engine room is ready for docking and dock water can be emptied.
For the complete procedure of dry dock operations for Engine Room Department, check out our ebook:
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