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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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Corrosion exists in the whole process of oil exploitation. Pipeline failure caused by corrosion can cause serious economic losses and Security incidents. Due to corrosion factors such as ions and bacteria introduced by sewage, the service environment of the sewage transmission pipeline between the sewage station and the water injection pressurization station studied in this paper becomes more serious[1]. Pipeline corrosion prevention becomes more challenging.
This paper presents an in-sight to the standard “ISO 12944 – Corrosion Protection of Steel Structures by Protective Paint Systems”, from the angle of prevention of premature coating-failure, but also how the standard can be used to help analyze premature coating-failures (if and when a coating-project was done as per ISO 12944).