2.1 Minimum freeboard should be determined by
seakeeping characteristics and stability. Model tests and calculations
should be carried out to provide Administrations with:
-
.1 measured data for the maximum hourly rate of
ingress of green water likely to be shipped into each cargo hold;
-
.2 evaluation of the adequacy of the discharge
rates from cargo hold freeing ports (if they are fitted).
2.2 The maximum hourly rate of ingress of green
water in any one open hold determined from model testing should not
exceed the hatch opening area multiplied by 400 mm/hour.
2.3 A conventional geometrical freeboard and minimum
bow height should be calculated assuming that hatch covers are fitted.
Under no circumstances should a freeboard and bow height be assigned
to an open-top containership which is less than the equivalent geometrical
freeboard determined from the LL 1966.
2.4 All seasonal freeboards should be omitted
unless the minimum geometrical freeboard and corresponding seasonal
freeboards for which the ship is eligible (assuming hatch covers fitted)
are greater than the freeboard for which the model tests were satisfactorily
carried out. In that case, the minimum geometrical freeboard and the
corresponding seasonal freeboards greater than the freeboard for which
the model tests were carried out should be assigned.
2.5 The minimum freeboard and minimum bow height
assigned to the ship should not be less than those corresponding to
the model test conditions.