With respect to the shape of the damages, they are assumed to be box-shaped with maximum dimensions according to the Regulations. The lesser extent damages are then, in accordance with MSC/Circular.406, generated by the scaling of the dimensions of that box-shaped damage in any or all three directions. There is no consideration given to considering damages by other 3D shapes; for example, choosing a convex body to simulate a bow. ship’s Certain damages which are automatically generated by specialised software applications may not lie within the spirit of the Regulations and so may be discounted, for example: - 1. damaged compartment(s) above the waterline without any compartments damaged below the waterline; 2. compartment(s) above the waterline which, according to the approved stability information booklet, have no relevant openings may always be considered damaged in the related damage cases; i.e. damage cases which consider those compartment(s) as buoyant may be disregarded. 3. internal compartments with no shell plate boundary being considered as damaged when no compartments bounding the shell are damaged; 4. pairs of compartments which are diagonally opposite one another. However, the following damages shall be included in the damage case list: - 1. Both port and starboard damages to account for any asymmetry in the design of the vessel; 2. lesser extent damages; for example: - “L‐shaped” 3. Damages which are based on the applicable regulations, but which may be perceived to never realistically happen in the view of the designer or operators. Q11 (How to deal with very small tanks in a large space such as an ER?) There should be a guideline explicitly specifying that all tanks and other watertight spaces smaller than 5 m3 or 0.5% of the displacement volume at Summer load line draft should either not be modelled or should be included as damaged in all damage cases that involve the compartment that contains them. Doing this will ensure that the damage cases required on the LI are well defined and identical to the set submitted in the damage calculation booklet. This will significantly simplify the LI approval
With respect to the shape of the damages, they are assumed to be box-shaped with maximum dimensions according to the Regulations. The lesser extent damages are then, in accordance with MSC/Circular.406, generated by the scaling of the dimensions of that box-shaped damage in any or all three directions. There is no consideration given to considering damages by other 3D shapes; for example, choosing a convex body to simulate a ship’s bow. Certain damages which are automatically generated by specialised software applications may not lie within the spirit of the Regulations and so may be discounted, for example: - 1. damaged compartment(s) above the waterline without any compartments damaged below the waterline; 2. compartment(s) above the waterline which, according to the approved stability information booklet, have no relevant openings may always be considered damaged in the related damage cases; i.e. damage cases which consider those compartment(s) as buoyant may be disregarded. 3. internal compartments with no shell plate boundary being considered as damaged when no compartments bounding the shell are damaged; 4. pairs of compartments which are diagonally opposite one another. However, the following damages shall be included in the damage case list: - 1. Both port and starboard damages to account for any asymmetry in the design of the vessel; 2. “L‐shaped” lesser extent damages; for example: - 3. Damages which are based on the applicable regulations, but which may be perceived to never realistically happen in the view of the designer or operators. Q11 (How to deal with very small tanks in a large space such as an ER?) There should be a guideline explicitly specifying that all tanks and other watertight spaces smaller than 5 m3 or 0.5% of the displacement volume at Summer load line draft should either not be modelled or should be included as damaged in all damage cases that involve the compartment that contains them. Doing this will ensure that the damage cases required on the LI are well defined and identical to the set submitted in the damage calculation booklet. This will significantly simplify the LI approval
Tanker_Damage_Stability_MGN_rev_1.docx