5.1 Acceptable tolerances should be in accordance
with table 1. Where two values are provided for the permissible tolerances,
the per cent deviation is allowable as long as it does not exceed
the following linear value for the particular hull form dependent
parameter.
5.2 Deviation from these tolerances should not
be accepted unless the Administration or RO acting on its behalf considers
that there is a satisfactory explanation for the difference and that
there will be no adverse effect on the capability of the ship to comply
with the stability criteria.
5.3 No deviation is generally allowed for input
data; however, small differences associated with calculation rounding
or abridged input data are acceptable.
Table 1 (relevant parts of
MSC.1/Circ.1229
are reproduced)
|
Hull form dependent
|
Tolerances
|
| Displacement
|
2%
|
| Longitudinal centre of buoyancy, from AP
|
1%/50 cm max
|
| Vertical centre of buoyancy
|
1%/5 cm max
|
| Transverse centre of buoyancy
|
0.5% of B/5 cm max
|
| Longitudinal centre of flotation, from AP
|
1%/50 cm max
|
| Moment to trim 1 cm
|
2%
|
| Transverse metacentric height
|
1%/5 cm max
|
| Longitudinal metacentric height
|
1%/50 cm max
|
| Cross curves of stability
|
5 cm
|
|
Compartment dependent
|
Tolerances
|
| Volume or deadweight
|
2%
|
| Longitudinal centre of gravity, from AP
|
1%/50 cm max
|
| Vertical centre of gravity
|
1%/5 cm max
|
| Transverse centre of gravity
|
0.5% of B/5 cm max
|
| Free surface moment
|
2%
|
| Level of contents
|
2%
|
Deviation in % = [(base value – applicant's value)/base
value] x 100
where the "base value" may be taken from the approved stability
information or the computer model.