Q10
(a) Describe the stability requirements of a ship for dry docking.
(6)
(b) A ship 130m long displaces 14000 tonnes when floating at draughts of 7.5m forward and 8.10 m aft. GML 125m, TPC 18, LCF. 3m aft of midships. Calculate the final draughts when a mass of 180 tonne lying 40m aft of midships is removed from the ship.
(10)
Reference Answer
### Part (a): Stability Requirements for Dry Docking For a ship to be safely dry-docked, stringent stability criteria must be met before and during the entire operation. The primary concern is the virtual loss of metacentric height (GM) during the critical period when the ship's keel first makes contact with the blocks and the dock water level continues to fall. The requirements are as follows: 1. **Adequate Positive Metacentric Height (GM):** * The ship must have a sufficient positive initial GM before the operation begins. This is crucial to counteract the virtual loss of stability that occurs during docking.
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