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This paper investigates a key concern with Ultra High Pressure Waterjetting (UHPWJ) surface preparation – the impact of “flash rusting” on coating life. Flash rusting can occur under certain environmental conditions when the steel is left sufficiently wet following UHPWJ. Reducing or eliminating flash rusting can increase the cost of surface preparation. However, flash rust’s impact on coating life is debated.
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The Federal Highway Administration, through its Innovative Bridge Research and Construction Program, requested research in the performance of paint coatings applied to bridges. The Maryland State Highway Administration tested two different, two ─ coat systems in a side-by-side comparison with its standard three ─ coat paint system consisting of organic zinc primer / epoxy polyamide intermediate / aliphatic urethane finish coat (currently the “State of the Art” system for most States).
Periodic and final tank monitoring during a two-year warranty offered to The City of Anoka, conducted jointly by Liquid Engineering Corporation, Sherwin Williams and SEH, identified no comparable differences between a single application of Corothane I Galvapac NSF, B65 Series, and two traditional systems used to repair and/or protect water tank interior surfaces.
Polyaspartic coatings can offer excellent performance characteristics typically expected of SSPC Specification Number 36, Level 3, for Aliphatic Polyurethane Topcoats. In addition, polyaspartates will pass an industry standard for corrosion protection in medium corrosivity environments direct to metal. These features offer the typical industrial maintenance customer high performance for gloss and color retention, while reducing application time and costs.
There is a new family of 100% renewably sourced and high performance poly (trimethylene ether) polyols which is being manufactured in a sustainable process using an ingredient derived from agricultural feedstock. Owing to its unique structure, these polyether diols have many useful properties such as low viscosity, low melting point, slow crystallization rates, high flexibility, resistance to heat and acidic environments. These attributes are ideal for coating applications.
Application of conventional coatings directly to concrete tanks is a common practice for the primary containment of liquids. Substituting the application of polyurea geomembranes in lieu of conventional methods exhibits a significant reduction in application time with regard to certain surface rehabilitation, surface preparation, and priming of substrates. Polyurea geomembranes are high performance liners designed for various reasons that include, but are not limited to, protection of the environment from pollution and hazardous materials or protection of the lining’s contents from vessel contamination.
Although polyurea geomembranes have been successfully used in the market for several years, technical information and performance evaluations are virtually nonexistent. Furthermore, when referring to construction specifications for polyurea geomembranes, physical properties of the coating and geotextile are listed rather than those of the geomembrane. Polyurea geomembranes have unique properties, and they deserve the same comprehensive testing and reporting as the components used to form them.
In today’s protective coating industry, there is a growing demand to proportion and spray 100% solids coatings that are high viscosity and composed of materials that make them compressible during processing. Epoxy intumescent fireproofing is one such material that starts as compressible in the pail and becomes more compressible when heated and agitated under air pressure.
This paper focuses on properly inspecting the performance of the coatings on pipe to support interfaces and soil to air interfaces, and what can be done to adequately plan for corrosion prevention and protect ambient temperature piping at natural gas compressor stations and petroleum tank farms.
Optimizing power generated from wind needs bigger improved designs and windy conditions, thus increasing installations offshore. As component costs decrease and processes improve, it can be profitable for farm developers to go further from shore into deeper waters and high-risk areas. In addition, the lifecycle expectancies of a coating system have developed along the way, moving from a typical >15 years expected lifetime in a given environment, to now >25 years.
Occasionally, the protective coatings on a structure reach a life span of 20 years. Quite often when this happens, one of the companies involved in the project, either the coating supplier or coating applicator, will publish pictures of the bridge or tank in a trade magazine as if the project was a great achievement. If instead, we accept the premise that most of the resins used to manufacture protective coatings easily remain stable for 20 years, we should ask ourselves the question, “why aren’t all of the coating systems lasting 20 years?”
This paper presents actual performance evaluation findings for various protective lining technologies commonly used for concrete corrosion protection in headspace environments in wastewater collection system and treatment plant applications after a variety of years in service.