After the entry into force of the SOLAS2009, the issue of its compatibility with Stockholm Agreement requirements hasbeen raised by IMO [1], since they are based on two different methodological approaches. The Stockholm Agreementrequires the compliance with deterministic SOLAS 90, with a defined amount of water on deck. SOLAS 2009 is basedin the probabilistic approach and it doesn’t take into account the ingress of water on Ro-Ro passenger ship car decks.The topic is work programme item for the Sub-Committee on Stability and Load Lines and on Fishing Vessels andseveral Administrations, included EU, and research groups have been strongly engaged on the issue that is planned to befinalized in the very next future.In this paper, some damage stability investigations for an existing Ro-Ro passenger ship within a modified probabilisticapproach are carried out in order to observe the influence on results of the inclining moment due to the presence of wateron the garage deck: the residual righting arm after the application of the water on deck effect derived from thedeterministic approach is taken into account for the evaluation of the relevant s factor within the present formulation.The investigation is performed applying calculations for different ship configurations, addressing specifically theinfluence of ship size with special attention to the different residual freeboard values.
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