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 110,00 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, time variant reliability approach and risk based inspection schemes.
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ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering
June 8–13, 2003
Cancun, Mexico
Conference Sponsors:
- Ocean, Offshore, and Arctic Engineering Division
ISBN:
0-7918-3682-7
PROCEEDINGS PAPER
Assessment of Corrosion Risks to Aging Ships Using an Experience Database Available to Purchase
John Spencer,
John Spencer
American Bureau of Shipping, Houston, TX
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Haihong Sun
Haihong Sun
American Bureau of Shipping, Houston, TX
Search for other works by this author on:
Ge Wang
American Bureau of Shipping, Houston, TX
John Spencer
American Bureau of Shipping, Houston, TX
Haihong Sun
American Bureau of Shipping, Houston, TX
Paper No:
OMAE2003-37299, pp. 283-293; 11 pages
Published Online:
January 23, 2009
Citation
Wang, G, Spencer, J, & Sun, H. "Assessment of Corrosion Risks to Aging Ships Using an Experience Database." Proceedings of the ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. Volume 2: Safety and Reliability; Pipeline Technology. Cancun, Mexico. June 8–13, 2003. pp. 283-293. ASME. https://doi.org/10.1115/OMAE2003-37299
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