Abstract
The chapter examines different aspects of consistency between the levels 1 and 2 of the vulnerability assessment within the IMO second generation intact stability criteria (SGISC). Both the dead ship condition and the pure loss of stability failure modes are considered. The most important aspect of consistency for the dead ship condition is its possible influence on the integrity of the existing mandatory stability regulations since the consistency between the levels of vulnerability criteria is, in fact, representative of consistency between the 2008 IS Code and the SGISC. The chapter describes a possible solution for the between-the-levels consistency of the pure loss of stability failure mode. The main idea is to assess the safety level of the deterministic criterion for the level 1 vulnerability criteria. Then, the standard for the probabilistic level 2 vulnerability criteria must be set to a higher level than the assessed level 1 safety level (as the level 2 criterion is meant to be less conservative than the level 1 criterion). For this approach to work, both levels 1 and 2 should use the same mathematical models of the stability failure or, at least, the model for level 1 should be inherently more conservative compared to the level 2.
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Acknowledgements
The work described in this paper has been funded by the Office of Design and Engineering Standards of the U.S. Coast Guard (CG-ENG) under the guidance of Mr. Jaideep Sirkar and by the US Navy Office of Naval Research under Dr. Woei-Min Lin. The authors are grateful to Mr. K. Weems (NSWCCD) for his help with calculations and to Prof. K. Spyrou for fruitful discussions on the methodology of calculations.
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Peters, W.S., Belenky, V. (2023). On Regulatory Consistency of Criteria for Dead Ship Condition and Pure Loss of Stability. In: Spyrou, K.J., Belenky, V.L., Katayama, T., Bačkalov, I., Francescutto, A. (eds) Contemporary Ideas on Ship Stability. Fluid Mechanics and Its Applications, vol 134. Springer, Cham. https://doi.org/10.1007/978-3-031-16329-6_5
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