C26 SAFETY OF LIFE AT SEA 



compartment to be governed by a higher factor provided the factor used 

 the lowest that is practicable and reasonable in the circumstances. 



(ii) Where, in the case of any ship whether less than 300 feet (or 91 

 metres) or not, the necessity of carrying appreciable quantities of cargo makes 

 it impracticable to require the subdivision abaft the forepeak to be governed 

 by a factor not exceeding • 50, the standard of subdivision to be applied shall 

 be determined in accordance with the following sub-paragraphs (1) to (5), 

 subject to the condition that where the Administration is satisfied that 

 insistence on strict compliance in any respect would be unreasonable, it may 

 allow such alternative arrangement of the watertight bulkheads as appears to 

 be justified on merits and will not diminish the general effectiveness of the 

 subdivision. 



(1) The provisions of paragraph (c) of this Regulation relating to the 



criterion numeral shall apply with the exception that in calculating 

 the value of P, for berthed passengers K is to have the value 

 defined in paragraph (c) of this Regulation or 125 cubic feet (or 

 3 55 cubic metres), whichever is the greater, and for unberthed 

 passengers K is to have the value 125 cubic feet (or 3-55 cubic 

 metres). 



(2) The factor B in paragraph (b) of this Regulation shall be replaced by 



the factor BB determined by the following formula : — 



L in feet 



57-6 



BB = ^ 77^ + • 20 (L = 1 80 and upwards) 



L — lUo 



L in metres 



17-6 

 BB= - + -20 (L = 55 and upwards) 



(3) The subdivision abaft the forepeak of ships 430 feet (or 131 metres) 



in length and upwards having a criterion numeral of 23 or less shall 

 be governed by the factor A given by formula (I) in paragraph (b) 

 of this Regulation; of those having a criterion numeral of 123 or 

 more by the factor BB given by the formula in sub-paragraph (ii) (2) 

 of this paragraph; and of those having a criterion numeral between 

 23 and 123 by the factor F obtained by linear interpolation between 

 the factors A and BB, using the formula: — 



_ ^ (A - BB) (Cs - 23) 



^ = ^ 100 



except that if the factor F so obtained is less than 50 the factor 

 to be used shall be either 50 or the factor calculated according to 

 the provisions of paragraph (d) (i) of this Regulation, whichever 

 is the smaller. 

 (4) The subdivision abaft the forepeak of ships less than 430 feet (or 

 131 metres) but not less than 180 feet (or 55 metres) in length 

 having a criterion numeral equal to S, where — 



Ch. 2 



