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An overview on lessons learned with high-performance polyurethane elastomers coatings in Alberta oil sands service, from material properties, operating conditions, wear data, to useful life and cost savings. Wear monitoring system with no perforation of the pipe wall is discussed.
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This presentation will describe high-performance polyurethane elastomer internal coatings for slurry pipelines, the intelligent coating system, and field experience with it.
This report provides the most current technology and industry practices for the internal in-situ cleaning and coating application in an existing steel pipeline. This report presents general practices and preferences in regard to the cleaning, surface preparation, drying, and the application of a coating in a steel pipeline by the pig (scraper) batching method. It is applicable to onshore or offshore steel pipelines in all industries including the oil and gas gathering, distribution, and transmission industries. It is also applicable to welded steel water and brine handling pipelines.
Stress development in epoxy coatings applied in water ballast tanks (WBT) on ships can lead to cracking, corrosion, and failure of ship’s hulls, with catastrophic consequences to the environment as well as loss of seamen at sea. Typically, these cracks do not appear during application and curing of the coating but after some finite time of service. The financial wellbeing of the ship’s owner can suffer greatly. To avoid such cracking, it is critical to have a clear understanding of the underlying mechanisms and primary controlling factors behind the coating cracks.
Internal coatings stress (ICS) develops in coatings applied to a rigid substrates. During drying, volume changes due to solvent loss and/or cure induces stresses in the films. Differences in the thermal expansion coefficients of the coating and substrate also affect the ICS. ICS affects the interfacial adhesion and results in delamination once the stress exceeds the force of adhesion.
During the 72-year history of using high performance coating systems for pipe internal corrosion control, there has been a slow introduction of different resin chemistries that serve as the backbone of these coating systems. While phenolic resins systems were the primary starting point, it transitioned to include epoxies, novolacs, nylons, urethanes and others. As needs outside corrosion control like deposit mitigation and wear resistance arose, coatings based on other specialty resin chemistries, like from the fluoropolymer family, were developed.
Internal linings used for corrosion protection often have to perform under severely corrosive environments. One major concern regarding coating performance is the negative effect of soluble salts on the steel substrate at the time of lining application, particularly for higher temperature lining applications. These salts impact the ability of the applied coating systems to protect the steel in several ways including osmotic coating blistering, promotion of under-film metallic corrosion and lining disbondment.