Comparative analysis on worldwide standards in fusion bonded epoxy powder coating of oil and gas pipelines

In this paper, the authors comparatively analyze the codes and standards worldwide on fusion bonded epoxy (FBE) powder coating of oil and gas pipelines in terms of coating structure, raw materials index and coating procedure, surface preparation and coating requirements, etc, and suggest that relevant inland standards should be revised according to CSA Z245.20-2006 and ISO 21809.2-2007. The suggestions include improving specific requirements in detection method for raw material, water content of epoxy powder and appropriately improving the requirements in cathodic disbonding technical indicators, referring the special provisions specified in NACE 0394-2002 to make surface preparation of steel pipe and coating, complementing the relative provisions in epoxy curing degree and interface impurity content and the requirements in coating cathodic disbonding test under the long-term high-temperature conditions for the coating procedure evaluation, making up the requirements in inspection frequency of epoxy curing degree, thermal characteristics, 24 h hot water soaking adhesion, interface impurity content, etc., as well as inspection provisions in the monitoring quality of spraying pressure in coating quality inspection and replenishing relevant provision in low-temperature epoxy powder.