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The durability of a coating can be described in a simplified manner as how well it adheres to the substrate and how well it performs over time once exposed to the environment. Oil and gas pipeline coatings need to withstand exposure to both mechanical and chemical forces for long periods of time to extend the life of the pipeline. A new class of 100% solids polyester polyols have been developed which can offer improved performance in urethane coating applications compared to other common protective systems such as epoxies, aspartics and solventborne polyesters
The durability of a coating can be described in a simplified manner as how well it adheres to the substrate and how well it performs over time once exposed to the environment. Oil and gas pipeline coatings need to withstand exposure to both mechanical and chemical forces for long periods of time to extend the life of the pipeline. A new class of 100% solids polyester polyols have been developed which can offer improved performance in urethane coating applications compared to other common protective systems such as epoxies, aspartics and solventborne polyesters. Coatings made with the new polyols will be shown to match or exceed the adhesion, abrasion, weatherability and chemical resistance when compared to these other technologies. By providing a 100% solids resin with low viscosity, the overall VOCs of the coating formulation can be reduced compared to traditional polyesters that often require higher levels of solvent to achieve a workable viscosity. Compatibility with a variety of other resins will also be discussed,
This paper discusses the many concerns related to new pipeline construction. Includingsafety, testing, documentation and lessons learned. Also addressed are abovegroundstorage tanks and some of their construction issues.
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Shielding of cathodic protection (CP) by pipeline coatings poses a serious threat to pipeline integrity. The difficulty in pipeline coating selection to avoid shielding is that the same properties that make a pipeline coating a good corrosion mitigation material can also lead to CP shielding. The key to proper coating selection is to select a coating that has the necessary properties to provide good corrosion protection but also one that, when disbondment and failure occurs, fails in such a way to allow effective cathodic protection.
The selection of a coating for suitable use on the exterior of a pipeline is an important consideration due to the safety and cost consequences of potential corrosion. Because there are numerous fusion bonded epoxy (FBE) mainline and field joint coating systems available, the selection of the optimum coating system is as much an art as a science.