In addition to the
requirements of Regulation II-1/B/8 of the SOLAS Convention relating to watertight
subdivision and stability in damaged condition, all ro-ro passenger ships referred to
in Article 3(1) shall comply with the requirements of this Annex.
The provisions of Regulation
II-1/B/8.2.3 shall be complied with when taking into account the effect of a
hypothetical amount of sea water which is assumed to have accumulated on the first
deck above the design waterline of the ro-ro cargo space or the special cargo space as
defined in Regulation II-2/3 assumed to be damaged (hereinafter referred to as "the
damaged ro-ro deck"). The other requirements of Regulation II-1/B/8 need not be
complied with in the application of the stability standard contained in this Annex.
The amount of assumed accumulated sea water shall be calculated on the basis of a
water surface having a fixed height above:
the lowest point of the deck edge of
the damaged compartment of the ro-ro deck; or
when the deck edge of the damaged
compartment is submerged then the calculation is based on a fixed height above the
still water surface at all heel and trim angles;
0,5 m if the residual freeboard (fr
0,3 m or less,
0,0 m if the residual freeboard
) is 2,0 m or more, and
values to be determined by linear interpolation, if the residual freeboard
) is 0,3 m or more but less than 2,0 m,
where the residual freeboard (fr
) is the
minimum distance between the damaged ro-ro deck and the final waterline at the
location of the damage in the damage case being considered without taking into account
the effect of the volume of assumed accumulated water on the damaged ro-ro deck,
When a high-efficiency drainage system
is installed, the administration of the flag State may allow a reduction in the height
of the water surface. 1.3.
For ships in
geographically defined restricted areas of operation, the administration of the flag
State may reduce the height of the water surface prescribed in accordance with point
1.1 by substituting such height of the water surface by the following:
0,0 m if the significant wave height
) defining the area concerned is 1,5 m or less;
the value determined in accordance
with paragraph 1.1 if the significant wave height (hs
the area concerned is 4,0 m or above; 1.3.3.
intermediate values to be determined by linear interpolation if the significant wave
) defining the area concerned is 1,5 m or more but
less than 4,0 m, provided that the following conditions are fulfilled:
the flag State administration is
satisfied that the defined area is represented by the significant wave height
) which is not exceeded with a probability of more than 10
%; and 1.3.5.
the area of operation and, if
applicable, the part of the year for which a certain value of the significant wave
) has been established are entered on the
As an alternative to the
requirements of paragraph 1.1 or 1.3, the flag State administration may exempt
application of the requirements of paragraph 1.1 or 1.3 and accept proof, established
by model tests carried out for an individual ship in accordance with the model test
method, which appears in the Appendix, justifying that the ship will not capsize with
the assumed extent of damage as provided in Regulation II-1/B/8.4 in the worst
location being considered under paragraph 1.1, in an irregular seaway, and
reference to acceptance of the results
of the model test as an equivalence to compliance with paragraph 1.1 or 1.3 and the
value of the significant wave height (hs) used in the model tests shall be entered on
the ship's certificates. 1.6.
supplied to the master in accordance with Regulations II-1/B/8.7.1 and II-1/B/8.7.2,
as developed for compliance with Regulations II-1/B/8.2.3 to II-1/B/188.8.131.52, shall
apply unchanged for ro-ro passenger ships approved according to these requirements.
For assessing the effect of the volume
of the assumed accumulated sea water on the damaged ro-ro deck in paragraph 1, the
following provisions shall prevail: 2.1.
transverse or longitudinal bulkhead shall be considered intact if all parts of it lie
inboard of vertical surfaces on both sides of the ship, which are situated at a
distance from the shell plating equal to one-fifth of the breadth of the ship, as
defined in Regulation II-1/2, and measured at right angles to the centreline at the
level of the deepest subdivision load line;
in cases where the ship's hull is
structurally partly widened for compliance with the provisions of this Annex, the
resulting increase of the value of one fifth of the breadth of it is to be used
throughout, but shall not govern the location of existing bulkhead penetrations,
piping systems, etc., which were acceptable prior to the widening;
the tightness of transverse or
longitudinal bulkheads which are taken into account as effective to confine the
assumed accumulated sea water in the compartment concerned in the damaged ro-ro deck
shall be commensurate with the drainage system, and shall withstand hydrostatic
pressure in accordance with the results of the damage calculation. Such bulkheads
shall be at least 4 m in height unless the height of water is less than 0,5 m. In such
cases the height of the bulkhead may be calculated in accordance with the following:
Bh = 8hw
is the bulkhead height;
and hw is the height of water.
In any event, the minimum height of the bulkhead should be not
less than 2,2 m. However, in case of a ship with hanging car decks, the minimum height
of the bulkhead shall be not less than the height to the underside of the hanging deck
when in its lowered position; 2.4.
special arrangements such as, e.g., full-width hanging decks and wide side casings,
other bulkhead heights may be accepted on the basis of detailed model tests;
the effect of the volume of the
assumed accumulated sea water need not be taken into account for any compartment of
the damaged ro-ro deck, provided that such a compartment has on each side of the deck
freeing ports evenly distributed along the sides of the compartment complying with the
where A is the total area of freeing ports on each side of
the deck in m2; and l is the length of the compartment in m;
the ship shall maintain a residual
freeboard of at least 1,0 m in the worst damage condition without taking into account
the effect of the assumed volume of water on the damaged ro-ro deck; and
such freeing ports shall be located
within the height of 0,6 m above the damaged ro-ro deck, and the lower edge of the
ports shall be within 2 cm above the damaged ro-ro deck; and
such freeing ports shall be fitted
with closing devices or flaps to prevent water entering the ro-ro deck whilst allowing
water which may accumulate on the ro-ro deck to drain.
When a bulkhead above the ro-ro deck
is assumed damaged, both compartments bordering the bulkhead shall be assumed flooded
to the same height of water surface as calculated in paragraph 1.1 or 1.3.
When determining significant wave
height, the wave heights given on the maps or list of sea areas established by Member
States in line with Article 5 of this Directive shall be used.
For ships which are to be operated
only for a shorter season, the host State administration shall determine in agreement
with the other country whose port is included in the ships route, the significant wave
height to be used. 4.
Model tests shall be
conducted in accordance with the Appendix.