SAFETY OF LIFE AT SEA 



C31 



(e) Unsymmetrical flooding is to be kept to a minimum consistent with 

 efficient arrangements. Where it is necessary to correct large angles of heel, 

 the means adopted shall, where practicable, be self-acting, but in any case 

 where controls to cross-flooding fittings are provided they shall be operable 

 from above the bulkhead deck. These fittings together with their controls 

 as well as the maximum heel before equalisation shall be acceptable to the 

 Administration. Where cross-flooding fittings are required the time for 

 equalisation shall not exceed 15 minutes. Suitable information concerning 

 the use of cross-flooding fittings shall be supplied to the master of the ship. 



(/) The final conditions of the ship after damage and, in the case of 

 unsymmetrical flooding, after equalisation measures have been taken shall 

 be as follows: — 



(i) in the case of symmetrical flooding there shall be a positive residual 

 metacentric height of at least 2 inches (or 05 metres) as calculated 

 by the constant displacement method; 



(ii) in the case of unsymmetrical flooding the total heel shall not exceed 

 seven degrees, except that, in special cases, the Administration may 

 allow additional heel due to the unsymmetrical moment, but in no 

 case shall the final heel exceed fifteen degrees; 



(iii) in no case shall the margin line be submerged in the final stage of 

 flooding. If it is considered that the margin line may become 

 submerged during an intermediate stage of flooding, the 

 Administration may require such investigations and arrangements 

 as it considers necessary for the safety of the ship. 



(g) The master of the ship shall be supplied with the data necessary to 

 maintain sufficient intact stabihty under service conditions to enable the ship 

 to withstand the critical damage. In the case of ships requiring cross-flooding 

 the master of the ship shall be informed of the conditions of stability on which 

 the calculations of heel are based and be warned that excessive heeling might 

 result should the ship sustain damage when in a less favourable condition. 



(/i) (i) No relaxation from the requirements for damage stability may be 

 considered by the Administration unless it is shown that the intact metacentric 

 height in any service condition necessary to meet these requirements is 

 excessive for the service intended. 



(ii) Relaxations from the requirements for damage stability shall be 

 permitted only in exceptional cases and subject to the condition that the 

 Administration is to be satisfied that the proportions, arrangements and other 

 characteristics of the ship are the most favourable to stability after damage 

 which can practically and reasonably be adopted in the particular 

 circumstances. 



Ch. 2 



