This section applies to all monohull vessels carrying 16
or more persons and those operating in Area Category 0 or 1, with
7 or more persons, subject to minimum safe manning levels being agreed
by the Certifying Authority.
11.2.1.1 Vessels should be so arranged that after
minor hull damage or failure of any one hull fitting in any one watertight
compartment, it will satisfy the residual stability criteria below.
This may be achieved by fitting water-tight subdivision or alternative
methods to the satisfaction of the Certifying Authority. Minor damage
should be assumed to occur anywhere in the length of the vessel but
not on a watertight subdivision.
11.2.1.2 In assessing survivability, the following
standard permeabilities should be used:-
| Space
|
Permeability %
|
| Appropriated for stores
|
60
|
| Appropriated for stores but not by a
substantial quantity thereof
|
95
|
| Appropriated for
accommodation
|
95
|
| Appropriated for machinery
|
85
|
| Appropriated for liquids
|
0 or 95 whichever results in the more
onerous requirements
|
Other methods of assessing floodable
volume may be considered, to the satisfaction of the Certifying Authority.
11.2.1.3 In the damaged condition, the residual
stability should be such that the angle of equilibrium does not exceed
7 degrees from the upright, the resulting righting lever curve has
a range to the downflooding angle of at least 15 degrees beyond the
angle of equilibrium, the maximum righting lever within that range
is not less than 100mm and the area under the curve is not less than
0.015 metre radians. This damage should not cause the vessel to float
at a waterline less than 75mm from the weatherdeck at any point. Proposals
to accept reduced freeboard or immersion of the margin line may be
accepted subject to special consideration.