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Failure Analysis of Antifouling Paints On Ships Hull

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Title Failure Analysis of Antifouling Paints On Ships Hull
 
Creator Ramesh, U. S.
Mukherjee, A.
Misra, S. C.
Joshi, Madhu
 
Subject Biofouling
Antifouling
Niche areas
Paint scheme
 
Description 2060-2066
Fouling
on ships hull occurs due to the attachment of barnacles, mollusks and other
aquatic organisms on the underwater area of the hull.  This leads to increased drag, fuel
consumption, resulting in unscheduled dry-docking.  Recent advances in antifouling (AF) paints,
in general, offer protection against fouling in about 95 % of the vessels
immersed surface.  However, the remaining
area which amounts to 5% or less of the total area does get fouled.  Although this level of fouling has marginal
impact on the routine performance of the vessel, it is a predominant vector for
the transmigration of invasive species which is a serious environmental
concern.  Virtually all ocean going
vessels are coated with antifouling paints, predominant among them are “Self
polishing coatings”. These coatings depend on the shear forces on the hull
surface caused by the motion of the vessel for the paint to “polish” away and
release a biocide at a predetermined rate that results in the hull to be
essentially fouling free. Currently hulls are coated with a uniform layer of
antifouling paints. However, computational fluid dynamics (CFD) analysis
conducted on various types of vessels have indicated that there are certain
“hotspots” where shear stresses and therefore the polishing rates are exceedingly
high which would polish the AF paints at a much faster rate and ultimately
result in the failure of the AF coating. The analysis also indicates that these
hotspots primarily depend on the profile of the vessels, its speed and its
draft.  The current practice of a uniform
coat of AF paint does not take into account the fact that there are certain
areas of the vessel where the polishing rates are excessive. A possible
solution to this issue is to first identify these hotspots and suitable paint schemes/formulations
are to be applied in these areas.  Such
painting schemes would prevent the premature failure of the AF coating in
general and significantly reduce the risk of transmigration of invasive
species.
 
Date 2016-06-30T05:02:44Z
2016-06-30T05:02:44Z
2014-11
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/34575
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(11) [November 2014]