2.5 Damage assumptions
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Statutory Documents - IMO Publications and Documents - International Codes - 1983 IGC Code - International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk - Chapter 2 Ship Survival Capability1 and Location of Cargo Tanks - 2.5 Damage assumptions

2.5 Damage assumptions

  2.5.1 The assumed maximum extent of damage should be:

.1 Side damage:    
.1.1 Longitudinal extent: 1/3L 2/3 or 14.5 m, whichever is less  
.1.2 Transverse extent: measured inboard from the ship's side at right angles to the centreline at the level of the summer load line B/5 or 11.5 m, whichever is less  
.1.3 Vertical extent: from the moulded line of the bottom shell plating at centreline upwards without limit  
.2 Bottom damage:    
    For 0.3L from the forward perpendicular of the ship Any other part of the ship
.2.1 Longitudinal extent: 1/3L 2/3 or 14.5 m, whichever is less 1/3L 2/3 or 5 m, whichever is less
.2.2 Transverse extent: B/6 or 10 m, whichever is less B/6 or 5 m, whichever is less
.2.3 Vertical extent: B/15 or 2 m, whichever is less measured from the moulded line of the bottom shell plating at centreline (see 2.6.3). B/15 or 2 m, whichever is less measured from the moulded line of the bottom shell plating at centreline (see 2.6.3).

  2.5.2 Other damage:

  • .1 If any damage of a lesser extent than the maximum damage specified in 2.5.1 would result in a more severe condition, such damage should be assumed.

  • .2 Local side damage anywhere in the cargo area extending inboard 760 mm measured normal to the hull shell should be considered and transverse bulkheads should be assumed damaged when also required by the applicable subparagraphs of 2.8.1.


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