1 A passenger ship intended to carry 400 or more persons
shall have watertight subdivision abaft the collision bulkhead so that
si = 1 for a damage involving all the compartments within
0.08L measured from the forward perpendicular for the three loading conditions
used to calculate the attained subdivision index A. If the attained subdivision
index A is calculated for different trims, this requirement shall also be
satisfied for those loading conditions.
2 A passenger ship intended to carry 36 or more persons is
to be capable of withstanding damage along the side shell to an extent specified in
paragraph 3. Compliance with this regulation is to be achieved by demonstrating that
si, as defined in regulation 7-2, is not less than 0.9 for the
three loading conditions used to calculate the attained subdivision index A. If
the attained subdivision index A is calculated for different trims, this
requirement shall also be satisfied for those loading conditions.
3 The damage extent to be assumed when demonstrating
compliance with paragraph 2, is to be dependent on the total number of persons carried,
and L, such that:
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.1 the vertical extent of damage is to extend
from the ship's moulded baseline to a position up to 12.5 m above
the position of the deepest subdivision draught as defined in regulation 2, unless a lesser vertical
extent of damage were to give a lower value of si
,
in which case this reduced extent is to be used;
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.2 where 400 or more persons are to be carried, a
damage length of 0.03L, but not less than 3 m is to be assumed at any
position along the side shell, in conjunction with a penetration inboard of
0.1B but not less than 0.75 m measured inboard from the ship side, at
right angles to the centreline at the level of the deepest subdivision
draught;
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.3 where less than 400 persons are carried, damage
length is to be assumed at any position along the shell side between
transverse watertight bulkheads provided that the distance between
two adjacent transverse watertight bulkheads is not less than the
assumed damage length. If the distance between adjacent transverse
watertight bulkheads is less than the assumed damage length, only
one of these bulkheads shall be considered effective for the purpose
of demonstrating compliance with paragraph 2;
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.4 where 36 persons are carried, a damage length of
0.015L but not less than 3 m is to be assumed, in conjunction with a
penetration inboard of 0.05B but not less than 0.75 m; and
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.5 where more than 36, but fewer than 400, persons
are carried the values of damage length and penetration inboard, used
in the determination of the assumed extent of damage, are to be obtained
by linear interpolation between the values of damage length and penetration
which apply for ships carrying 36 persons and 400 persons as specified
in subparagraphs .4 and .2.