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Regulation 27 Types of Ships 1) For the purposes of freeboard computation ships shall be divided into Type “A” and Type “B”. Type “A” ships

Type “A” ships
Ships that comply to the following requirements: •

Were designed to carry only liquid cargoes in bulk

• The cargo tanks have only small access openings which must be closed by watertight doors, of steel or equivalent material, provided with gaskets.

• They have low permeability in the loaded cargo compartments • When loaded to the Summer load line, must float in satisfactory conditions after the flooding due to the standard d...

Regulation 27 Types of Ships 1) For the purposes of freeboard computation ships shall be divided into Type “A” and Type “B”. Type “A” ships

Type “A” ships
Ships that comply to the following requirements: •

Were designed to carry only liquid cargoes in bulk

• The cargo tanks have only small access openings which must be closed by watertight doors, of steel or equivalent material, provided with gaskets.

• They have low permeability in the loaded cargo compartments • When loaded to the Summer load line, must float in satisfactory conditions after the flooding due to the standard damage • If the ship has L > 150 m the flooded compartment(s) must have an assumed permeability of 0.95.

• If the ship has L > 225 m the engine room should be also considered as a floodable compartment, with an assumed permeability of 0.85.

from

http://www.mar.ist.utl.pt/mventura/projecto-navios-i/en/sd-1.2.2-load_lines.pdf
https://marinegyaan.com/what-is-difference-between-type-a-and-type-b-ship/

International Convention on Load Lines 1966