A case history of a large diameter pipeline with fusion bonded epoxy coating that experienced AC corrosion within six (6) years while a similar 67-year-old pipeline with coal tar enamel coating experienced none.
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Coal tar enamel coating systems. Recommended physical property requirements, surface preparation, application, inspection & repair practices.
Establishing minimum requirements to ensure proper application and performance of a plant-applied coal tar enamel system to the external surfaces of pipe. Historical Document 1999
Technology and industry practices for field-applied coal tar enamel external pipe coating systems. Applicable to underground steel pipelines in the oil and gas gathering, distribution, and transmission industries.