C46 SAFKTY OF LIFE AT SEA 



(g) (i) In addition to the direct bilge suction or suctions required 

 paragraph (/) of this Regulation there shall be in the machinery space a direc 

 suction from the main circulating pump leading to the drainage level of the 

 machinery space and fitted with a non-return valve. The diameter of this 

 direct suction pipe shall be at least two-thirds of the diameter of the pump 

 inlet in the case of steamships, and of the same diameter as the pump inlet in 

 the case of motorships. 



(ii) Where in the opinion of the Administration the main circulating 

 pump is not suitable for this purpose, a direct emergency bilge suction shall 

 be led from the largest available independent power driven pump to the 

 drainage level of the machinery space; the suction shall be of the same 

 diameter as the main inlet of the pump used. The capacity of the pump so 

 connected shall exceed that of a required bilge pump by an amount satisfactory 

 to the Administration. 



(iii) The spindles of the sea inlet and direct suction valves shall extend 

 well above the engine room platform. 



(iv) Where the fuel is, or may be, coal and there is no watertight 

 bulkhead between the engines and the boilers, a direct discharge overboard 

 or alternatively a by-pass to the circulating pump discharge, shall be fitted 

 from any circulating pump used in compliance with sub-paragraph (i) of this 

 paragraph. 



(h) (i) All pipes from the pumps which are required for draining cargo 

 or machinery spaces shaH be entirely distinct from pipes which may be used 

 for filling or emptying spaces where water or oil is carried. 



(ii) All bilge pipes used in or under coal bunkers or fuel storage tanks 

 or in boiler or machinery spaces, including spaces in which oil-settling tanks 

 or oil fuel pumping units are situated, shall be of steel or other approved 

 material. 



(/) The diameter of the bilge main shall be calculated according to the 

 following formulae provided that the actual internal diameter of the bilge 

 main may be of the nearest standard size acceptable to the Administration: 



where d = internal diameter of the bilge main in inches 



L = length of ship in feet 



B = breadth of ship in feet 



D = moulded depth of ship to bulkhead deck in feet; 



Ch. 2 



