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In this paper failure analysis methodology will be applied to the principal mechanisms by which paints and coatings fail during service; with specific application to case studies involving T&D pipelines and utility structures. The case studies will apply standard failure analysis techniques to determine the primary causes and modes of failures.
Shielding of cathodic protection (CP) by pipeline coatings poses a serious threat to pipeline integrity. The difficulty in pipeline coating selection to avoid shielding is that the same properties that make a pipeline coating a good corrosion mitigation material can also lead to CP shielding. The key to proper coating selection is to select a coating that has the necessary properties to provide good corrosion protection but also one that, when disbondment and failure occurs, fails in such a way to allow effective cathodic protection.
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In this paper, failure analysis methodology will be applied to the principal mechanisms by which FBE coatings fail during long term service; with specific application to case studies involving blistering. The case studies apply standard failure analysis techniques to determine the primary causes and modes of failures.
Industrial and marine protective coating systems are most commonly applied without incident and perform as expected over their anticipated service life. However, occasionally, a coating system will fail prematurely, for unexpected reasons, and with expensive consequences. This paper addresses those unexpected failures and provides reasons and remedies for such occurrences.