Regulation 1 - Definitions
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.265(VIII) – Regulations on Subdivision and Stability of Passenger Ships as an Equivalent to Part B of Chapter II of the International Convention for the Safety of Life at Sea, 1960 – (Adopted on 20 November 1973) - Annex - Regulations on Subdivision and Stability of Passenger Ships as An Equivalent to Part B of Chapter II of the International Convention for the Safety of Life at Sea, 1960 - Regulation 1 - Definitions

Regulation 1 - Definitions

 For the purpose of these Regulations, unless expressly provided otherwise:

  (a)

  • (i) A “subdivision loadline” is a waterline used in determining the subdivision of the ship; and

  • (ii) the “deepest subdivision loadline” is the waterline which corresponds to the greatest draught permitted by the subdivision requirements which are applicable.

  (b) the “subdivision length of the ship” (Ls ) is the extreme moulded length of that part of the ship below the immersion limit line.

  (c) “midlength” is the midpoint of the subdivision length of the ship (Ls ).

  (d)

  • (i) the “breadth” (B 1) is the extreme moulded breadth of the ship at midlength at or below the deepest subdivision loadline;

  • (ii) the “breadth” (B 2) is the extreme moulded breadth of the ship at midlength at the relevant bulkhead deck.

  (e) The “relevant bulkhead deck” is the uppermost deck which, together with the watertight bulkheads bounding the extent of flooding under consideration and the shell of the ship, defines the limit of watertight integrity in the flooded condition.

  (f) The “immersion limit line” at any point in Ls is defined by the highest relevant bulkhead deck at side at that point.

  (g) The “draught” (d i ) is the vertical distance from the moulded base line at midlength to the waterline in question.

  • (i) The “subdivision draught” (ds ) is the draught up to the subdivision loadline in question.

  • (ii) The “lightest service draught” (do ) is the service draught corresponding to the lightest anticipated loading and associated tankage, including, however, such ballast as may be necessary for stability and/or immersion.

  • (iii) Intermediate draughts between ds and do are:

  (h) The “effective mean damage freeboard” (F 1) is equal to the projected area of that part of the ship taken in the upright position between the relevant bulkhead deck and the damage waterline and between forward and abaft the midlength divided by . In making this calculation no part of the area which is more than 0.2B 2 above the damage waterline shall be included. However, if there are stairways or other openings in the bulkhead deck through which serious downflooding could occur F 1 shall be taken as not more than (B 2 tang θf ), where θf is the angle at which such openings would be immersed.

  (i) The “permeability” (μ) of a space is the proportion of the immersed volume of that space which can be occupied by water.

Parent topic: Annex - Regulations on Subdivision and Stability of Passenger Ships as An Equivalent to Part B of Chapter II of the International Convention for the Safety of Life at Sea, 1960
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