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External corrosion of underground pipelines is being controlled by the use of latest technologies in protective coatings and by maintaining adequate levels of cathodic protection (CP). The role of the coating is to act as a physical and dielectric (non-conductive) barrier to isolate from the surrounding electrolyte and to limit the CP current requirement. The protective coating acts as the primary or first line of defense against corrosion; however no coating system is perfect and will subject to degradation with time, in addition to some voids/holidays during application, transport, and operations.
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