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TECHNICAL PAPERS

Nonlinear Time Dependent Corrosion Wastage of Deck Plates of Ballast and Cargo Tanks of Tankers

[+] Author and Article Information
Y. Garbatov

Unit of Marine Technology and Engineering, Technical University of Lisbon, Instituto Superior Técnico, Avenue Rovisco Pais, 1049-001 Lisboa, Portugalyordan.garbatov@mar.ist.utl.pt

C. Guedes Soares

Unit of Marine Technology and Engineering, Technical University of Lisbon, Instituto Superior Técnico, Avenue Rovisco Pais, 1049-001 Lisboa, Portugalguedess@mar.ist.utl.pt

G. Wang

 American Bureau of Shipping, ABS Plaza, 16855 Northchase Drive, Houston, TX 77060-6006gwang@eagle.org

J. Offshore Mech. Arct. Eng 129(1), 48-55 (Feb 16, 2006) (8 pages) doi:10.1115/1.2426987 History: Received July 21, 2005; Revised February 16, 2006

The corrosion wastage of deck plates of ballast and cargo tanks is analyzed based on a nonlinear corrosion model. This model is able to describe an initial period without corrosion due to the presence of a corrosion protection system, a transition period with a nonlinear increase of wastage up to a steady state of long-term corrosion wastage. This model is applied to corrosion wastage data of deck plates collected by the American Bureau of Shipping. The objective of this work is to fit this corrosion wastage model to the service measured data, determining the values of the model parameters that represent the best fit to the data so as to describe how corrosion wastage varies in time as a result of generalized corrosion.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Thickness of corrosion wastage as a function of time

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Figure 2

Data of deck plates of ballast tanks, as-built thickness

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Figure 4

Data of deck plates of cargo tanks, as-built thickness

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Figure 5

Data of deck plates of cargo tanks versus ship length between perpendiculars

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Figure 6

Histograms of corrosion wastage of deck plates of ballast tanks for the 19th year

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Figure 13

Frequency scatter diagram of corrosion wastage of deck plates of cargo tanks

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Figure 14

Time dependent mean corrosion wastage of deck plates of ballast tanks

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Figure 16

Comparative analysis of corrosion wastage of deck plates of ballast and cargo tanks

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Figure 17

Standard deviation of the yearly data of corrosion wastage of deck plates of cargo tanks

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Figure 18

Standard deviation of the yearly data of corrosion wastage of deck plates of ballast tanks

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Figure 19

Log-normal probability density function of the corrosion wastage of deck plates of ballast tanks for the entire period of 32 years

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Figure 23

Comparative analysis of corrosion rate of deck plates of ballast and cargo tanks

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Figure 3

Data of deck plates of ballast tanks versus ship length between perpendiculars

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Figure 7

Histograms of corrosion wastage of deck plates of ballast tanks for the 21st year

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Figure 9

Histograms of corrosion wastage of deck plates of cargo tanks for the 19th year

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Figure 11

Histograms of corrosion wastage of deck plates of cargo tanks for the 25th year

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Figure 8

Histograms of corrosion wastage of deck plates of ballast tanks for the 25th year

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Figure 10

Histograms of corrosion wastage of deck plates of cargo tanks for 21st year

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Figure 12

Frequency scatter diagram of corrosion wastage of deck plates of ballast tanks

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Figure 15

Time dependent mean corrosion wastage of deck plates of cargo tanks

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Figure 20

Log-normal probability density function of the corrosion wastage of deck plates of cargo tanks for entire the period of 32 years

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Figure 22

Time dependent probability density function of corrosion wastage of deck plates of ballast tanks

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Figure 21

Time dependent probability density function of corrosion wastage of deck plates of cargo tanks

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