Answer
Type A ships
A type ‘A’ ship is a ship which:
a)Is designed to carry only liquid cargoes in bulk;
b)has a high integrity of the exposed Deck with only small access openings to cargo compartments, closed by watertight g asketed covers of steel or equivalent material; and
c)Has low permeability of loaded cargo compartments.
A type 'A' ship, if over 150 m in length, when loaded, shall be able to withstand the flooding of any compartment or compartments, with an assumed permeability of 0.95 and the machinery space shall be treated as a floodable compartment, but with a permeability of 0.85.
Type B ships
– in general assigned freeboard as per table 28.2
- All ships which do not come within the provisions regarding type 'A' ships, shall be considered as type ‘B’ ships.
- Type 'B' ships, which in position 1 have hatchways fitted with hatch covers complying with the requirements of regulation 16(2) through (5), be assigned freeboards based on table 28.2.
- Any type 'B' ship of over 100 m in length may be assigned freeboards less than those required under paragraph (7), provided that, in relation to the amount of reduction granted
a)the measures provided for the protection of the crew are adequate;
b) the freeing arrangements are adequate;
c)the covers in position 1 and 2 comply with the provisions of regulation 16(1) through (5) and (7); and
d)the ship, when loaded, shall be able to withstand the flooding of any compartment or compartments, with an assumed permeability of 0.95, consequent upon the damage assumptions, and shall remain afloat in a satisfactory condition of equilibrium, over 150 m in length, the machinery space shall be treated as a floodable compartment, but with a permeability of 0.85. - In calculating the freeboards for type ‘B’ ships, the values from table 28.2 shall not be reduced by more than 60% of the difference between the tabular values in tables 28.1 and 28.2 for the appropriate ship lengths.