It can be divided into two main types, Type A and Type B. Let's look at the two parts separately.
Type A
A type “A” ship is one which: Is designed to carry only liquid cargoes in bulk;
Has a high integrity of the exposed deck with only small access openings to cargo
compartments, closed by watertight gasketed covers of steel or equivalent material; and
Has low permeability of loaded cargo compartments.
Type B
All ships, which do not come within the provisions regarding type “A” ships in above, are considered as type “B” ships.
Type “B” ships, which have hatchways fitted with hatch covers, are assigned freeboards based
upon the values Loadline rules
Type B ship of over 100 m length assigned a freeboard less than that required normally, where the flag State Administration is satisfied that she meets the rules relating to protection of the crew, freeing arrangements, covers and single compartment damage stability. Hatch covers are to be steel, with weathertightness achieved by gaskets. The ship may be called a Type B-60 or B-100 ship.
•
Type B-60
Type B ship in which the reduction in freeboard has been increased up to 60% of the total difference between the values for basic Type A and Type B freeboards. The ship must meet one compartment damage stability requirements. A large number of Panamax and Capesize bulk carriers are B-60.
• Type B-100
Type B ship in which the reduction in freeboard has been increased up to the total difference between the values for basic Type A and Type B freeboards, effectively making the ship a Type A ship. The ship must meet two compartment damage stability requirements. Only a small number of ships are B-100.
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