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Estimating the Impact of New-generation Antifoulings on Ship Performance: The Presence of Slime

Lookup NU author(s): Maxim Candries, Professor Mehmet Atlar, Dr Colin Anderson


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Due to the phase-out of TBT-SPCs imposed by the International Maritime Organization, new-generation antifoulings are set to replace 80% of the existing antifouling market. Two types of coatings are claimed to offer satisfactory performance over five years: tin-free SPCs and foul-release coatings, which were both commercially introduced in the mid 1990s. This paper gives an overview of the research at the University of Newcastle upon Tyne which compares the drag, boundary-layer and roughness characteristics of both coatings when newly applied. It was found that foul-release coatings offer less drag than tin-free SPC, by an amount which depends on the quality of application and which has been related to the respective differences in roughness characteristics.Assessments have shown that foul-release surfaces are very effective against macrofouling organisms, but that the surface is covered by slime films when the vessel returns to dry-dock. A literature review on the effect of slime films on ship resistance shows that slime films have a significant effect on drag, but in turbulent flows the effect is likely to remain limited because of detachment processes. Further research is underway to investigate this.

Publication metadata

Author(s): Atlar M; Anderson CD; Candries M

Publication type: Article

Publication status: Published

Journal: Proceedings of IMarEST Part A: Journal of Marine Engineering and Technology,

Year: 2003

Issue: 2

Pages: 13-22

ISSN (print): 1476-1548

Publisher: Institute of Marine Engineering, Science and Technology