7.1 The intact stability characteristics of any
ship carrying bulk grain shall be shown to meet, throughout the voyage,
at least the following criteria after taking into account in the manner
described in part B of this Code and,
in figure A 7, the heeling moments
due to grain shift:
-
.1 the angle of heel due to the shift of grain
shall not be greater than 12° or in the case of ships constructed
on or after 1 January 1994 the angle at which the deck edge is immersed,
whichever is the lesser;
-
.2 in the statical stability diagram, the net
or residual area between the heeling arm curve and the righting arm
curve up to the angle of heel of maximum difference between the ordinates
of the two curves, or 40° or the angle of flooding (θ1),
whichever is the least, shall in all conditions of loading be not
less than 0.075 metre-radians; and
-
.3 the initial metacentric height, after correction
for the free surface effects of liquids in tanks, shall be not less
than 0.30 m.
7.2 Before loading bulk grain the master shall,
if so required by the Contracting Government of the country of the
port of loading, demonstrate the ability of the ship at all stages
of any voyage to comply with the stability criteria required by this
section.
7.3 After loading, the master shall ensure that
the ship is upright before proceeding to sea.
Figure A7
(1)
Where:
|
λ0
|
= |
|
|
λ40
|
= |
0.8
× λ0;
|
|
Stowage factor |
= |
volume
per unit weight of grain cargo; |
|
Displacement |
= |
weight
of ship, fuel, fresh water, stores etc. and cargo. |
(2) The righting arm curve shall be derived from
cross-curves which are sufficient in number to accurately define the
curve for the purpose of these requirements and shall include cross-curves
at 12° and 40°.