2.7.1 The requirements of 2.9 shall be confirmed by calculations which
take into consideration the design characteristics of the ship; the
arrangements, configuration and contents of the damaged compartments;
the distribution, relative densities and the free surface effects
of liquids; and the draught and trim for all conditions of loading.
2.7.2 The permeabilities of
spaces assumed to be damaged shall be as follows:
|
Spaces
|
Permeabilities
|
| Appropriated to stores
|
0.60
|
| Occupied by accommodation
|
0.95
|
| Occupied by machinery
|
0.85
|
| Voids
|
0.95
|
| Intended for consumable liquids
|
0 to 0.95footnote
|
| Intended for other liquids
|
0 to 0.95footnote
|
2.7.3 Wherever damage penetrates
a tank containing liquids it shall be assumed that the contents are
completely lost from that compartment and replaced by salt water up
to the level of the final plane of equilibrium.
2.7.4 Every watertight division
within the maximum extent of damage defined in 2.5.1 and considered to have sustained damage in positions
given in 2.8.1 shall be assumed to
be penetrated. Where damage less than the maximum is being considered
in accordance with 2.5.2, only watertight
divisions or combinations of watertight divisions within the envelope
of such lesser damage shall be assumed to be penetrated.
2.7.5 The ship shall be so
designed as to keep unsymmetrical flooding to the minimum consistent
with efficient arrangements.
2.7.6 Equalization arrangements
requiring mechanical aids such as valves or cross-levelling pipes,
if fitted, shall not be considered for the purpose of reducing an
angle of heel or attaining the minimum range of residual stability
to meet the requirements of 2.9 and
sufficient residual stability shall be maintained during all stages
where equalization is used. Spaces which are linked by ducts of large
cross-sectional area may be considered to be common.
2.7.7 If pipes, ducts, trunks
or tunnels are situated within the assumed extent of damage penetration,
as defined in 2.5, arrangements shall
be such that progressive flooding cannot thereby extend to compartments
other than those assumed to be flooded for each case of damage.
2.7.8 The buoyancy of any superstructure
directly above the side damage shall be disregarded. The unflooded
parts of superstructures beyond the extent of damage, however, may
be taken into consideration provided that:
-
.1 they are separated from the damaged space by
watertight divisions and the requirements of 2.9.3 in respect of these intact spaces are complied with;
and
-
.2 openings in such divisions are capable of being
closed by remotely operated sliding watertight doors and unprotected openings are
not immersed within the minimum range of residual stability required in 2.9;
however, the immersion of any other openings capable of being closed weathertight
may be permitted.