Type a and b-100 ships difference wrt loadline ?

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A Type B-100 ship is any Type B ship of over 100 metres in length which, fulfilling the requirements reported in Ch 3, App 4, [4.4], is assigned with a value of tabular freeboard which can be reduced up to 100 per cent of the difference between the "B" and "A" tabular values for the appropriate ship lengths.

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Type A ships
 A type A ship is one 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 gasketed covers of steel or equivalent material; and

(c). has low permeability of loaded cargo compartments.

(3). 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 requirements of paragraph (11), 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 in paragraph (12), and shall remain afloat in a satisfactory condition of equilibrium, as specified in paragraph (13). In such a ship, the machinery space shall be treated as a floodable compartment, but with a permeability of 0.85.

(4). A type A ship shall be assigned a freeboard not less than that based on table 28.1.

Type B ships
(5). All ships which do not come within the provisions regarding type A ships in paragraphs (2) and (3) shall be considered as type B ships.

(6). Type B ships, which in position 1 have hatch covers which are permitted by the Administration to comply with the requirements of regulation 15 (other than paragraph (6)) or which are fitted with securing arrangements accepted under the provisions of regulation 16(6), shall be assigned freeboards based upon the values given in table 28.2, increased by the values given in table 27.1.