NEW CLASS B, C AND D SHIPS:

A main transverse bulkhead may be stepped provided that it meets one of the following conditions: the combined length of the two compartments, separated by the bulkhead in question, does not exceed either 90 % of the floodable length or twice the permissible length, except that, in ships having a subdivision factor equal to 1, the combined length of the two compartments in question shall not exceed the permissible length; additional subdivision is provided in way of the step to maintain the same level of safety as that secured by a plane bulkhead; the compartment over which the step extends does not exceed the permissible length corresponding to a margin line taken 76 mm below the step. In ships of 100 metres in length and upwards, one of the main transverse bulkheads abaft the forepeak shall be fitted at a distance from the forward perpendicular which is not greater than the permissible length. If the distance between two adjacent main transverse bulkheads, or their equivalent plank bulkheads, or the distance between the transverse planes passing through the nearest stepped portions of the bulkheads, is less than 3,0 metres plus 3 % of the length of the ship, or 11,0 metres, or 10 % of the length of the ship, whichever is less, only one of these bulkheads shall be regarded as forming part of the subdivision of the ship. Where the required subdivision factor is 0,50, the combined length of any two adjacent compartments shall not exceed the floodable length.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.