Figure 3-2 Residual stability for self-elevating units
3.4.1 The unit should have sufficient freeboard
and be subdivided by means of watertight decks and bulkheads to provide
sufficient buoyancy and stability to withstand:
-
.1 in general, the flooding of any one compartment
in any operating or transit condition consistent with the damage assumptions
set out in section 3.5; and
-
.2 for a self-elevating unit, the flooding of
any single compartment while meeting the following criterion (see figure 3-2):
RoS ≥ 7º + (1.5θs)
where:
RoS ≥ 10º
|
RoS
|
= |
range
of stability, in degrees = θm – θs
|
where:
|
θm
|
= |
maximum
angle of positive stability, in degrees |
|
θs
|
= |
static
angle of inclination after damage, in degrees |
The range of stability is determined without reference
to the angle of downflooding.
3.4.2 The unit should have sufficient reserve
stability in a damaged condition to withstand the wind heeling moment
based on a wind velocity of 25.8 m/s (50 knots) superimposed from
any direction. In this condition the final waterline, after flooding,
should be below the lower edge of any downflooding opening.