Ships subject to the Code should be capable of surviving
the assumed damage specified in 2.5 to
the standard provided in 2.8 in a condition
of stable equilibrium and should satisfy the following criteria.
2.9.1 In any stage of flooding:
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.1 the waterline, taking into account sinkage, heel
and trim, should be below the lower edge of any opening through which progressive
flooding or downflooding may take place. Such openings should include air pipes
and openings which are closed by means of weathertight doors or hatch covers and
may exclude those openings closed by means of watertight manhole covers and
watertight flush scuttles, small watertight cargo tank hatch covers which maintain
the high integrity of the deck, remotely operated watertight sliding doors, and
sidescuttles of the non-opening type;
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.2 the maximum angle of heel due to unsymmetrical
flooding should not exceed 30°; and
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.3 the residual stability during intermediate stages
of flooding should be to the satisfaction of the Administration. However, it
should never be significantly less than that required by 2.9.2.1.
2.9.2 At final equilibrium
after flooding:
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.1 the righting lever curve should have a minimum
range of 20° beyond the position of equilibrium in association with a maximum
residual righting lever of at least 0.1 m within the 20° range; the area under the
curve within this range should not be less than 0.0175 m.rad. Unprotected openings
should not be immersed within this range unless the space concerned is assumed to
be flooded. Within this range, the immersion of any of the openings listed in
2.9.1.1 and other openings capable of being closed
weathertight may be permitted; and
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.2 the emergency source of power should be capable of
operating.