Damages to ships due to corrosion are very likely, and the likelihood increases with the aging of ships. Risk and reliability approaches are more and more frequently applied in design and maintenance planning. These advanced approaches require reliable data reflecting the structural condition of ships in service. Such data is scarce. This paper presents a database of corrosion wastage. It is based on over 110000 thickness measurements recently collected from 140 trading tankers. This database is larger than most other corrosion databases in the public domain. Corrosion wastage exhibits a high level of variability. In addition to thickness measurements of individual structural members, this database also has information on hull girder's geometrical properties and strength of ships in service. Corrosion wastage has an influence on the hull girder strength. Statistical interpretations of the database are used to represent corrosion wastage in oil tankers. The severity of corrosion is ranked by three levels: slight, moderate, and severe levels corresponding respectively to 50%, 75%, and 95% cumulative probability on the database. The risks of corrosion wastage to aging ships' structural integrity are assessed using the observations of the corrosion wastage database. The investigated risks are loss of local member's strength, loss of global hull girder strength, and shortened inspection intervals. The experience database can be used in many aspects, such as design requirements for corrosion additions and wastage allowance for plate renewal, establishment of limits to hull girder strength of FPSOs (Floating Production Storage and Offloading vessels), time variant reliability approach, and risk based inspection schemes.
Assessment of corrosion risks to aging ships using an experience database
Einschätzung von Korrosionsgefahren für das Altern von Schiffen unter Verwendung einer auf Erfahrungswerten basierenden Datenbank
Transactions of the ASME. Journal of Offshore Mechanics and Arctic Engineering ; 127 , 2 ; 167-174
2005
8 Seiten, 25 Quellen
Aufsatz (Zeitschrift)
Englisch
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