560 



(iii) Vertical extent (vc) : from the base line upwards without 

 limit. 



(h) Bottom damage 



(i) Longitudinal extent (4) : For 0.3L from the forw^ard perpendic- 

 ular of ship, L/10 ; any other part of ship, L/10 or 5 metres, which- 

 ever is less. 



(ii) Transverse extent {t^) : For 0.3L from the forward perpendic- 

 ular of ship, B/6 or 10 metres, whichever is less but not less than 5 

 metres ; any other part of ship, 5 metres. 



(iii) Vertical extent from the base line {vs) : B/15 or 6 metres, 

 whichever is less. 



(2) Wherever the symbols given in this Kegulation appear in this 

 Chapter, they have the meaning as defined in this Eegulation. 



REGULATION 2 3 



Hypothetical Out-flow of Oil 



(1) The hypothetical outflow of oil in the case of side damage (Oc) 

 and bottom damage (Os) shall be calculated by the following formulae 

 with respect to compartments breached by damage to all conceivable 

 locations along the length of the ship to the extent as defined in Eegu- 

 lation 22 of this Annex. 



(a) for side damages : 



Oe = 2Wi + 2KiCi (1) 



(b) for bottom damages: 



Os = i/3(2ZiWi + 2ZiC0 (II) 



Where : Wi = volume of a wing tank in cubic metres assumed 



to be breached by the damage as specified in Eegulation 22 



of this Annex; Wi for a segregated ballast tank may be 



taken equal to zero. 

 Where : Ci = volume of a centre tank in cubic metres assumed 



to be breached by the damage as specified in Eegulation 22 



of this Annex; Ci for a segregated ballast tank may be 



taken equal to zero, 

 Where: Ki = l— bi/tc; when bi is equal to or greater than tc, 



Ki shall be taken equal to zero. 

 Where: Zi = l— hi/vg when hi is equal to or greater than Vg, 



Zi shall be taken equal to zero, 

 Where : bi = wddth of wing tank in metres under consideration 



measured inboard from the ship's side at right angles to 



the centreline at the level corresponding to the assigned 



summer freeboard. 

 Where: hi = minimum depth of the double bottom in metres 



under consideration; where no double bottom is fitted hi 



shall be taken equal to zero, 

 Whenever symbols given in this paragraph appear in this Chapter, 

 they have the meaning as defined in this Eegulation. 



(2) If a void space or segregated ballast tank of length less than Ic 

 as defined in Eegulation 22 of this Annex is located between wing oil 

 tanks, Oc in formula (I) may be calculated on the basis of volume Wi 

 being the actual volume of one such tank (where they are of equal 

 capacity) or the smaller of the two tanks (if they differ in capacity). 



