Damage Stability

Question 1

What are the damage assumptions for SIDE DAMAGE for Type A, B-60, B-100?
Where do these regs come from?

Answer 1

• Regs as per Load line Code
• VERTICAL EXTENT, from baseline up without limit.
• TRANSVERSE EXTENT, equal to B/5 or 11.5m whichever is lesser.
• DAMAGE OF LESSER EXTENT, if damage of lesser extent results in a more severe condition, lesser extent shall be assumed.
• LONGITUDINAL, confined to one compartment except for certain types of vessels where two compartments can be flooded.

Question 2

Flooding Assumptions for Type A vessels

Answer 2

• > 100m to 150m, 1 comp’, not mach’ space.
• > 150m to 225m, 2 adjacent F & A comp’ or 1 mach’ space.
• > 225m 2 adjacent F & A comp’ 1 of which one can be a mach’ space.

Question 3

Flooding Assumptions for B-100

Answer 3

• > 100m to 150m, any 2 adjacent F & A comp’, no mach’ space
• > 150m, 2 adjacent F & A comp’ 1 of which may be mach’ space.

Question 4

Flooding Assumptions for B-60

Answer 4

• > 100m to 150m 1 comp’.
• > 150m 1 comp’ or 1 mach’ space.

Question 5

What is the assumed permeability for a compartment and for a machinery space?

Answer 5

• Compartment = 95% or 0.95.
• Machinery Space = 85% or 0.85.

Question 6

What is the condition of equilibrium?

Answer 6

the condition of the vessel after flooding.

Question 7

What are the conditions of equilibrium as per the LLR?

What vessels do these apply to?

Answer 7

• Type A, B-100, B-60
• Final waterline must be below any opening through which progressive flooding could take place.
• Angle of heel due to unsymmetrical flooding must not exceed 15° (or 17° of no deck edge immersion).
• GM in flooded condition not < 0.1m.
• Sufficient stab in intermediate stages of flooding.
• Range of +ve stability after θE not < 20°.
• D.S not < 0.0175 mr.

Question 8

What are the additional conditions of equilibrium for a Type-A vessel as per MARPOL?

Answer 8

• Angle of heel due to unsymmetrical flooding shall not exceed 25° (or 30° of no deck edge immersion).
• All other criteria match LLR

Question 9

What is the the IBC Code?

Answer 9

International Code for the Construction and Equipment of Ships carrying Dangerous Chemicals in Bulk

Question 10

Bottom damage Assumptions for MARPOL

Answer 10

For 0.3 L form the FP
- LONGITUDINAL EXTENT, 1/3L ^2/3 or 14.5m whichever is less.
- TRANSVERSE EXTENT, B/6 or 10m whichever is less.
- VERTICAL EXTENT, B/15 or 6m whichever is less.

Question 11

What damage Stability information shall be exhibited on the Bridge?

Answer 11

• Boundaries all watertight compartments and their openings.
• Means of remote closure.
• Arrangements for correction of list due to flooding.
• Operating instructions for cross flooding valves.
• Any other useful information for maintaining stability after damage.