SAFETY OF LIFE AT SEA ^^' 



or 



•J 



d = 1-68 /L (B+D)4-25 



where d = internal diameter of the bilge main in millimetres 



L = length of ship in metres 



B = bread of ship in metres 



D = moulded depth of ship to bulkhead deck in metres. 



The diameter of the bilge branch pipes shall be determined by rules to be 

 made by the Administration. 



(;■) The arrangement of the bilge and ballast pumping system shall be 

 such as to prevent the possibility of water passing from the sea and from 

 water ballast spaces into the cargo and machinery spaces, or from one 

 compartment to another. Special provision shall be made to prevent any 

 deep tank having bilge and ballast connections being inadvertently run up 

 from the sea when* containing cargo, or pumped out through a bilge pipe 

 when containing water ballast. 



{k) Provision shall be made to prevent the compartment served by any 

 bilge suction pipe being flooded in the event of the pipe being severed, or 

 otherwise damaged by coUision or grounding in any other compartment. 

 For this purpose*, ^yhere the pipe is at any part situated nearer the side of 

 the ship than one-fifth the breadth of the ship (measured at right angles to 

 the centre line at the level of the deepest subdivision load line), or in a duct 

 keel, a non-return valve shall be fitted to the pipe in the compartment 

 containing the open end. 



(/) All the distribution boxes, cocks and valves in connection with the 

 bilge pumping arrangements shall be in positions which are accessible at 

 all times under ordinary circumstances. They shall be so arranged that, in 

 the event of flooding, one of the bilge pumps may be operative on any 

 compartment; in addition, damage to a pump or its pipe connecting to the 

 bilge main outboard of a line drawn at one-fifth of the breadth of the ship 

 shall not put the bilge system out of action. If there is only one system of 

 pipes common to all the pumps, the necessary cocks or valves for controlling 

 the bilge suctions must be capable of being operated from above the bulkhead 

 deck. Where in addition to the main bilge pumping system an emergency 

 bilge pumping system is provided, it shall be independent of the main system 

 and so arranged that a pump is capable of operating on any compartment 

 under flooding conditions; in that case only the cocks and valves necessary 

 for the operation of the emergency system need be capable of being operated 

 from above the bulkhead deck. 



Ch. 2 



