5.1 Identical assumptions should be made regarding
the extent of damage penetration when calculating the `A' values for
both the actual and notional ship KG values. This damage penetration
extent should be no less than B/5, measured inboard from the ship
side. However, contributions to these `A' values may be included for
damage cases involving penetration extents in excess of B/5.
5.2 Where there is longitudinal bulkhead nearer
to the ship side than B/5, it should be assumed to be penetrated.
In such a case, there may be a further damage case to be considered
within the same longitudinal damage zone. Both the 'A' values should
be calculated accordingly.
5.3 Where a ship has been constructed to a two-compartment
standard of subdivision, 'A' should be calculated using a notional
ship KG appropriate to that for which the 's' values calculated for
the two-compartment damage cases are unity. In such a case, it may
be assumed that all the 's' values for the one-compartment damage
cases are also unity. The corresponding A/Amax ratio is
then given by the ratio:
where:
A1
|
= |
is that part of the
'A' value calculated for the one-compartment damage cases, using the
actual KG; |
A2
|
= |
is that part of the
'A' value calculated for the two-compartment damage cases, using the
actual KG; |
Amax
1
|
= |
is that
part of the 'A' value calculated for the one-compartment damage cases,
using the notional KG; |
Amax
2
|
= |
is that
part of the 'A' value calculated for the two-compartment damage cases,
using the notional KG; |
5.4 Where a ship has been constructed to a one-compartment
standard of subdivision, 'A' should be calculated using a notional
ship KG appropriate to that for which all the 's' values calculated
for the one-compartment damage cases are unity. For the purposes of
future analysis, the A/Amax ratio should be calculated
using the formula: