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Publications
Ferreira, S.A. and Guedes Soares, C. (2002), “Probabilistic Approach to Tanker Subdivision based on Environmental Considerations”, Proceedings of the 10th International Congress of the International Maritime Association of the Mediterranean (IMAM´02), 13-17 May, Rethymno, Crete-Hellas
The accidental oil spills problematic from crude oil tankers and the impact on public opinion has led to large changes in tanker industry. During the last decade the International Organisations did issue new regulations approving new design concepts as environmental friendly, once they are able to reduce accidental oil outflow. The present paper describes a systematic analysis of these new concepts and their results in terms of oil outflow performance. These concepts were analysed using the latest probabilistic methodology, proposed by IMO, but with some enhancements regarding bottom damage location. In total, more than 100 different tankers were evaluated, comprising different tanker concepts and variations inside each concept concerning different internal compartimentation location.
The outflow performance according to the Regulation 13F of IMO MARPOL shows significant differences between the analysed tankers. A discussion of the resulting probabilistic oil outflows is presented with comparisons of the environmental characteristics of the sample tankers. These sample tankers include both variations of internal subdivision within the same ship type and also among different design types. The calculations also show that is possible, inside each concept, to provide a "better location", in terms of environmental performance, for the internal oiltight bulkheads.
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