What is meaning of Floodable length in passenger ships as per SOLAS?

Points to pounder for floodable length in passenger ship
  • 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.
  • 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 without the ship being submerged beyond the margin line.
  • 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 76 mm below the top of the deck (at side) to which the bulkheads concerned and the shell are carried watertight.
  • 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 water tightness of those portions of the bulkheads which are above the margin line and immediately under the higher deck.
  1. In determining the floodable length, a uniform average permeability shall be used throughout the whole length of each of the following portions of the ship below the margin line:
    • The machinery space as defined in regulation ;
    • The portion forward of the machinery space; and
    • The portion abaft the machinery space.
  2. The uniform average permeability throughout the machinery space shall be determined from the formula:

85 + 10( a-c)/v

a =  the volume of the passenger spaces, as defined in regulation 2, which are situated below the margin line within the limits of the machinery space;
c = the volume of between-deck spaces below the margin line within the limits of the machinery space which are appropriated to cargo, coal or stores;
v = the whole volume of the machinery space below the margin line.

About the author


Leave a Comment