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The selection of a coating for suitable use on the exterior of a pipeline is an important consideration due to the safety and cost consequences of potential corrosion. Because there are numerous fusion bonded epoxy (FBE) mainline and field joint coating systems available, the selection of the optimum coating system is as much an art as a science.
The selection of a coating for suitable use on the exterior of a pipeline is an important consideration due to the safety and cost consequences of potential corrosion. Because there are numerous fusion bonded epoxy (FBE) mainline and field joint coating systems available, the selection of the optimum coating system is as much an art as a science. This paper discusses some of the variables and constraints to be considered in the selection of FBE mainline and field joint coating systems; FBE coating systems in common use; the failure mechanism of pipeline coatings with cathodic protection; and laboratory screening tests used for coating selection, with a commentary regarding testing variables that may influence test results and account for differences in field performance. Finally coating characterization tests, which may be used for quality control and problem-solving purposes are discussed
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.
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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.