C66 SAFETY OF LIFE AT SEA 



I 



(iii) Stairway enclosure bulkheads shall have an insulation value to the 

 satisfaction of the Administration, having regard to the nature of the adjacent 

 spaces. The means for closure at openings in stairway enclosures shall be 

 at least as effective for resisting fire as the bulkheads in which they are fitted. 

 Doors other than watertight doors shall be of the self-closing type, as required 

 for the main venical zone bulkheads, in accordance with Regulation 38 of 

 this Cnapter. 



(/)) Method II 



(i) Main stairways shall be of steel frame construction, except where 

 the Administration sanctions the use of other suitable materials which. 

 together with such supplementarv' fire protection and or extinction 

 arrangements as would, in the opinion of the Administration, be equivalent 

 to such construction, and shall be within enclosures formed of *' A " Class 

 d!\isions with positive means of closure at all openings from the lowest 

 accommodation deck at least to a level which is directly accessible to the open 

 deck except that : — 



(1) a stairway connecting only two decks need not be enclosed, provided 

 the integrity of the deck is maintained by proper bulkheads or 

 doors at one level; 



(2) stairways may be fitted in the open in a public space, provided they 

 lie wholly within such public space. 



(ii) Stairwa) enclosures shall have direct communication with the 

 corridors and be of sufficient area to prevent congestion having in view the 

 number of persons likely to use them in an emergency, and shall contain as 

 little accommodation or other enclosed space in which a fire may originate 

 as practicable. 



(iii'i Stairway enclosure bulkheads shall ha%e an insulation value to the 

 satisfaction of the Administration having regard to the nature of the adjacent 

 spaces. The means for closure at openings in stairway enclosures shall be 

 at leiist as effective for resisting fire as the bulkheads in which they are fitted. 

 Doors other than watertight doors shall be of the self-closing type as required 

 for the main vertical zone bulkheads, in accordance with Regulation 38 of 

 this Chapter. 



(iv) Auxiliary stairways, namely those which do not form part of the 

 means of escape required by Regulation 68 of this Chapter and which connect 

 only two decks, shall be of steel frame construction, except where the 

 Administration sanctions the use of other suitable material in special cases, 

 but need not be within enclosures, provided the integrity of the deck is 

 maintained by the fitting of sprinklers at the auxiliary stairways. 



Ex. Doc K. N7-1 O 7 



Ch. 2 



