C20 SAFETY OF LIFE AT SEA 



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(h) The machinery space is to be taken as extending from the moulded 

 base line to the margin line and between the extreme plain 

 transverse watertight bulkheads bounding the spaces containing the 

 main and auxiliary propelling machinery, boilers serving the needs 

 of propulsion, and all permanent coal bunkers. 



In the case of unusual arrangements, the Administration may 

 define the limits of the machinery spaces. 

 (/■) Passenger spaces are those which are provided for the accommodation 

 and use of passengers, excluding baggage, store, provision and mail 

 rooms. 



For the purposes of Regulations 4 and 5 of this Chapter, spaces 

 provided below the margin line for the accommodation and use 

 of the crew shall be regarded as passenger spaces. 



(/) In all cases volumes and areas shall be calculated to moulded lines. 



PART B.— SUBDIVISION AND STABILITY 



(Part -B applies to passenger ships only, except that Regulation 19 also 



applies to cargo ships.) 



Regulation 3 



Floodable Length 



(a) The floodable length at any point of the length of a ship shall be 

 determined by a method of calculation which takes into consideration the form, 

 draught and other characteristics of the ship in question. 



{b) In a ship with a continuous bulkhead deck, the floodable length at a 



given point is the maximum portion of the length of the ship, having its centre 



at the point in question, which can be flooded under the definite assumptions 



/ set forth in Regulation 4 of this Chapter without the ship being submerged 



beyond the margin line. 



(c) (i) In the case of a ship not having a continuous bulkhead deck, the 

 floodable length at any point may be determined to an assumed continuous 

 margin line which at no point is less than 3 inches (or 76 millimetres) below 

 the top of the deck (at side) to which the bulkheads concerned and the shell are 

 carried watertight. 



(ii) Where a portion of an assumed margin line is appreciably below 

 the deck to which bulkheads are carried, the Administration may permit a 

 limited relaxation in the watertightness of those portions of the bulkheads 

 which are above the margin line and immediately under the higher deck. 



Ch. 2 



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