Incorporated probability that a fleet meets a given permissible value for the hull girder section modulus loss |
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Authors: | Lyuben D Ivanov Ge Wang |
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Institution: | (1) Department of Technology, American Bureau of Shipping, 16855 Northchase Dr., Houston, TX 77060, USA |
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Abstract: | The paper presents a study on the incorporated probability that a tanker fleet meets a given permissible value of hull girder
strength loss. The analysis was based on a database of hull girder section modulus (HGSM) for as-gauged girth belts of tankers.
It was found that its mean value is below 5% over the entire life span of the analyzed tanker fleet. The Weibull probabilistic
distribution was found to best represent the time-varying HGSM loss. A method was developed for calculating the incorporated
safety of a fleet. As an example, the IMO requirement for a maximum HGSM reduction of 10% relative to its required value was
analyzed, accounting for time-variant HGSM loss and including a probabilistic model for coating longevity.
The views expressed in the paper are those of the authors and not necessary those of ABS. |
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Keywords: | Hull girder strength Time-variant reliability of ship structures |
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