deeper drafts. This is particularly the case with bulk carriers since these
vessels can often be designed to obtain the ‘B-60’ freeboards; and where
this is impossible some reduction in freeboard may still be possible. The
Convention allows freeboards between that assigned to a Type ‘B’ and a
Type ‘B-60’ where it can be established that a one-compartment standard
of sub-division can be obtained at the draft of a Type ‘B’ vessel, but not at
the draft of a Type ‘B-60’.
Ore carriers of normal layout arranged with two longitudinal bulkheads
and having the side compartments as water ballast tanks, are particularly
suited to the assignment of Type ‘B-100’ freeboards, where the bulkhead
positions are carefully arranged. In the case of Type ‘A’, Type ‘B-100’, and
Type ‘B-60’ vessels over 225 m the machinery space is also to be treated as a
floodable compartment. The full sub-division requirements are given
below.
Damage is assumed as being for the full depth of the ship, with a penetration
of 1/5 the beam clear of main transverse bulkheads. After flooding the
final water-line is to be below the lower edge of any opening through which
progressive flooding may take place. The maximum angle of heel is to be
15°, and the metacentric height in the flooded condition should be positive.