In other words we can understand type A and B as :
For the purpose of assigning freeboards 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 a low permeability of loaded cargo compartments.
A type ‘A’ ship if over 150 m in length to which a freeboard less than type ‘B’ has been assigned, when loaded in accordance with the assumed initial condition of loading, shall be able to withstand the flooding of any compartment or compartments, with an assumed permeability of 0.95, consequent upon the damage assumptions specified, and shall remain afloat in a satisfactory condition of equilibrium. In such a ship the machinery space shall be treated as a floodable compartment, but with a permeability of 0.85.
Container ahip is having which type freeboard
what does “Has a low permeability of loaded cargo compartments.” mean?
Means when the ship is loaded there isn’t enough enough or slack volume between the cargo. Liquids carrying ships have low permeability.
Gas tanker also comes in type A ship??
Tankers carrying Gas in liquid form along with high integrity of exposed deck and only a small entry into cargo space makes it Type A.