Concerning the use of other figures for permeability "if
substantiated by calculations", such permeabilities should reflect
the general conditions of the ship throughout its service life rather
than specific loading conditions.
This paragraph allows for the recalculation of permeabilities.
This should only be considered in cases where it is evident that there
is a major discrepancy between the values shown in the regulation
and the real values. It is not designed for improving the attained
value of a deficient ship of regular type by the modification of chosen
spaces in the ship that are known to provide significantly onerous
results. All proposals should be considered on a case-by-case basis
by the Administration and should be justified with adequate calculations
and arguments.