SUB-COMMITTEE ON STABILITY AND LOAD LINES AND ON ...
SUB-COMMITTEE ON STABILITY AND LOAD LINES AND ON ...
SUB-COMMITTEE ON STABILITY AND LOAD LINES AND ON ...
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Ref.: 391/09 and 520/09<br />
BSU<br />
Bundesstelle für Seeunfalluntersuchung<br />
Federal Bureau of Maritime Casualty Investigation<br />
ACCIDENT<br />
ACCIDENT<br />
Figure 26: Stability comparison without ballast water left, accident condition right<br />
The analyses show that because of the only marginal immersion at the forward<br />
perpendicular, the prominent bow flare is no longer wetted in swell, either. This<br />
means that the roll moment applied to the vessel by the swell reduces significantly,<br />
and that is the true reason for the significant improvement in the rolling behaviour.<br />
When considering the longitudinal bending moments, the two cases are to be<br />
regarded as being of equal value:<br />
ACCIDENT<br />
ACCIDENT<br />
Figure 27: Longitudinal strength without ballast water left, accident condition right<br />
The maximum longitudinal bending moment becomes slightly less in the 'Without<br />
ballast water' case, but is still markedly higher than the permissible longitudinal<br />
bending moment. In the case of 'Without ballast water', the permissible longitudinal<br />
bending moments are just exceeded by 1-2% in some places. In the calculation case<br />
'Without ballast water', it should be noted that the minimum permissible draught was<br />
not reached at the forward perpendicular; this must be observed according to the<br />
class rule in order to avoid a slamming hazard to the bottom. Therefore, to prevent<br />
slamming damage and thus also avoid endangering the vessel's structure, she may<br />
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