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Damage to coatings leads to higher potential corrosion sites on the metallic surface and could ultimately lead to a decrease in service life. This paper will present a novel coating system that incorporates both damage resistance and flexibility in a system that is not subject to cathodic shielding.
Fusion bonded epoxy (FBE) coatings have been used on pipelines as protection against corrosion for 50 years. They have been used as a stand-alone product in single layer systems and as a primer in dual layer FBE and three layer polyolefin systems. Pipeline coating systems require physical properties that minimize damage during transit, installation and operation. Damage to the coating leads to higher potential corrosion sites on the metallic surface and could ultimately lead to a decrease in service life. There are several ways that have been used conventionally to attempt to make a FBE coating more resistant to mechanical damage. In one conventional approach, the thickness of the overall coating is increased to provide added absorption of impact and abrasion. However, as the thickness of the coating increases, the coating has a increased tendency to crack. Another conventional approach to enhance damage resistance is to add an abrasion resistant overcoat that has a high filler loading to increase abrasion resistance and decrease impact damage. However, higher filler loadings can dramatically decrease the flexibility of the FBE coating. Yet another conventional approach to enhance damage resistance is to use a three layer polyolefin coating system. Unfortunately, when damage does occur in these systems, cathodic shielding may allow corrosion to develop unchecked. This paper will present a novel coating system that incorporates both damage resistance and flexibility in a system that is not subject to cathodic shielding. Key words: fusion-bonded epoxy, FBE, pipe coating, damage resistance, impact resistance, abrasion resistant overcoat, ARO, dual layer FBE, 2LFBE
Fusion Bonded Epoxy (FBE) is required to protect the pipes in higher temperatures. This paper reports evaluation methods for these high Tg FBE, and the performance differences between the high Tg FBE and general FBE.
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Corrosion protective coatings deteriorate for a number of reasons including insufficient surface preparation and deficient thickness. This paper discusses the mechanisms of failure and provides a technical overview regarding the deterioration aspects of coatings.
This paper begins with a brief discussion of essential properties of all pipeline coatings, and a listing of multi-layer systems designed to meet specific needs. It then focuses on special considerations regarding application parameters for multi-layer systems that use fusionbonded epoxy as the primer.