SAFETY OF LIFE AT SEA C59 



Regulation 35 



Definitions 



Wherever the phrases defined below occur throughout this Part of this 

 Chapter, they shall be interpreted in accordance with the following 

 definitions : — 



(a) Incombustible Material means a material which neither burns nor gives 



off inflammable vapours in sufficient quantity to ignite at a pilot 

 flame when heated to approximately 1,382°F. (or 750° C). Any 

 other material is a " Combustible Material ". 



(b) A Standard Fire Test is one in which specimens of the relevant 



bulkheads or decks, having a surface of approximately 50 square 

 feet (or 4-65 square metres) and height of 8 feet (or 2-44 metres) 

 resembling as closely as possible the intended construction and 

 including where appropriate at least one joint, are exposed in a test 

 furnace to a series of time temperature relationships, approximately 

 as follows : — 



at the end of the 



(c) "A" Class or Fire-resisting Divisions are those divisions formed by 

 bulkheads and decks which comply with the following : — 



(i) they shall be constructed of steel or other equivalent material; 



(ii) they shall be suitably stiffened; 



(iii) they shall be so constructed as to be capable of preventing the 

 passage of smoke and flame up to the end of the one-hour 

 standard fire test; 



(iv) they shall have an insulating value to the satisfaction of the 

 Administration, having regard to the nature of the adjacent 

 spaces. In general, where such bulkheads and decks are 

 required to form fire-resisting divisions between spaces either 

 of which contains adjacent woodwork, wood lining, or other 

 combustible material, they shall be so insulated that, if either 

 face is exposed to the standard fire test for one hour, the 

 average temperature on the unexposed face will not increase 

 at any time during the test by more than 250"^ F. (or 139°C.) 

 above the initial temperature nor shall the temperature at 

 any point on the face, including any joint, rise more than 

 325 °F. (or 180°C.) above the initial temperature. Reduced 

 amounts of insulation or none at all may be provided where 

 in the opinion of the Administration a reduced fire hazard 

 is present. The Administration may require a test of an 

 assembled prototype bulkhead or deck to ensure that it 



Ch. 2 



