C74 SAFETY OF LIFE AT SEA 





(c) Pressure in the Fire Main 



(i) The diameter of the fire main and water service pipes shall be sufficient 

 for the effective distribution of the maximum required discharge from two fire 

 pumps operating simultaneously, except that in the case of cargo ships the 

 diameter need only be sufficient for the discharge of 140 tons per hour. 



(ii) With the two pumps simultaneously delivering through nozzles specified 

 in paragraph {g) of this Regulation, the quantity of water specified in sub- 

 paragraph (i) of this paragraph, through any adjacent hydrants, the following 

 minimum pressures shall be maintained at all hydrants: — 



Passenger ships 



4,000 tons gross tonnage and 45 pounds per square inch (or 3 2 



upwards kilogrammes per square centimetre) 



1,000 tons gross tonnage and 40 pounds per square inch (or 28 



upwards, but under 4,000 tons kilogrammes per square centimetre) 



gross tonnage 



Under 1,000 tons gross tonnage To the satisfaction of the 



Administration 



Cargo ships 



6,000 tons gross tonnage and 40 pounds per square inch (or 28 



upwards kilogrammes per square centimetre) 



1,000 tons gross tonnage and 37 pounds per square inch (or 26 



upwards, but under 6,000 tons kilogrammes per square centimetre) 



gross tonnage 



Under 1,000 tons gross tonnage To the satisfaction of the 



Administration 



(d) Number and Position of Hydrants 



The number and position of the hydrants shall be such that at least two 

 jets of water not emanating from the same hydrant, one of which shall be 

 from a single length of hose, may reach any part of the ship normally 

 accessible to the passengers or crew while the ship is being navigated. 



(e) Pipes and Hydrants 



(i) Materials readily rendered ineffective by heat shall not be used for 

 fire mains unless adequately protected. The pipes and hydrants shall be so 

 placed that the fire hoses may be easily coupled to them. In ships where 

 deck cargo may be carried, the positions of the hydrants shall be such that 

 ■they are always readily accessible and the pipes shall be arranged as far 

 as practicable to avoid risk of damage by such cargo. Unless there is 

 provided one hose and nozzle for each hydrant in the ship there shall be 

 complete interchangeability of hose couplings and nozzles. 



(ii) Cocks or valves shall be fitted in such positions on the pipes that any 

 of the fire hoses may be removed while the fire pumps are at work. 



Ch. 2 





