Answer
Initial Condition of Loading
The initial condition of loading before flooding shall be determined as follows:
a) The ship is loaded to its summer load waterline on an imaginary even keel
b) When calculating the vertical centre of gravity, the following principles apply:
i) homogeneous cargo is carried;
ii) all cargo compartments, shall be considered fully loaded except that in the case of fluid cargoes each compartment shall be treated as 98% full;
iii)50 per cent of the ship's total capacity of tanks and spaces fitted to contain each type of consumables and stores is allowed for.
iv)At an angle of heel of not more than 50 in each compartment containing liquids, the maximum free surface shall be taken into account
Damage Assumptions
The following principles regarding the character of the assumed damage apply:
a) The vertical extent of damage in all cases is assumed to be from the base line upwards without limit.
b) The transverse extent of damage is equal to B/5 or 11.5 m, whichever is the lesser, measured inboard from the side of the ship perpendicularly to the centerline at the level of the summer load waterline.
c) If damage of a lesser extent than specified in subparagraphs (a) and (b) results in a more severe condition, such lesser extent shall be assumed.
d) the flooding shall be confined to a single compartment between adjacent transverse bulkheads e)
f) Where the flooding of any two adjacent fore and aft compartments is envisaged, main transverse watertight bulkheads shall be spaced at least (1/3) L2/3 or 14.5 m, whichever is the lesser, in order to be considered effective.
Condition of equilibrium (Question can be asked separately)
The condition of equilibrium after flooding shall be regarded as satisfactory provided
a) The final waterline after flooding, taking into account sinkage, heel and trim, is below the lower edge of any opening through which progressive downflooding may take place. Such openings shall include air pipes, ventilators and openings which are closed by means of weathertight doors or hatch covers.
b) If pipes, ducts or tunnels are situated within the assumed extent of damage penetration, arrangements shall be made so that progressive flooding cannot thereby extend to compartments other than those assumed to be floodable
c) The angle of heel due to unsymmetrical flooding does not exceed 15°. If no part of the Deck is immersed, an angle of heel of up to 17° may be accepted.
d) The metacentric height in the flooded condition is positive.
e) When any part of the Deck outside the compartment assumed flooded in a particular case of damage is immersed. It may be regarded as sufficient if the righting lever curve has a minimum range of 20° beyond the position of equilibrium with a maximum righting lever of at least 0.1 m within this range. The area under the righting lever curve within this range shall be not less than 0.0175 m.rad.