2.1 The method of application of criteria to the
residual stability curve is similar to that for intact stability except
that the craft in the final condition after damage should be considered
to have an adequate standard of residual stability provided:
2.2 The wind heeling lever for application on
the residual stability curve should be assumed constant at all angles
of inclination and should be calculated as follows:
where:
|
Pd
|
= |
120
(Pa) |
|
A |
= |
projected lateral
area of the portion of the ship above the lightest service waterline
(m2)
|
|
Z |
= |
vertical distance
from the centre of A to a point one half of the lightest service draught
(m) |
|
Δ |
= |
displacement
(t) |
2.3 The same values of roll angle should be used
as for the intact stability.
2.4 The downflooding point is important and is
regarded as terminating the residual stability curve. The area A2 should
therefore be truncated at the downflooding angle.
2.5 The stability of the craft in the final condition
after damage should be examined and shown to satisfy the criteria,
when damaged as stipulated in these Interim Guidelines.
2.6 In the intermediate stages of flooding, the
maximum righting lever should be at least 0.05 m and the range of
positive righting lever should be at least 7°. In all cases, only
one breach in the hull and only one free surface need to be assumed.