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Two large scale problems with three layer polyolefin (3LPO) coatings are discussed here and possible reasons for the failures. Lessons learned and recommendations for future usage of such coatings are provided.
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This paper aims to present a novel class of pipeline protective lining materials that provide erosion-corrosion resistance combined with negligible wear to spray equipment. These coatings have been formulated with a blend of thermoplastic fillers rather than the traditional ceramic fillers used for erosion resistance.
During the winter of 2013-2014, Northern California experienced unusually cold temperatures (below 40°F). These low temperatures delayed Pacific Gas & Electric Company (PG&E) coating operations on new pipelines. Since liquid epoxy coatings capable of being applied at, or which fully cure at, temperatures below 50°F were not approved, PG&E chose to control the environment using small enclosures over the application area. This approach proved to be expensive and time consuming, so a novel method of pipeline surface temperature control was necessary to allow application of liquid epoxies at low ambient temperatures.