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Protection of steel exposed to high temperature areas, in particular those which are insulated, provides some of the most demanding situations faced by coatings. Systems applied in these areas are required not only to give resistance to high operating temperatures (which are often cyclic) but also provide corrosion protection.
In the late part of the 1980’s, the inventor worked with the reflective coating companies that made “NASA ceramic paints”. During this time that he worked with the reflective companies, he learned that the formulas used for reflective paints were not made from NASA technology and were only good for light reflection. When the coatings became dirty or tarnished, the coatings did not reflect heat.
In the worldwide oil and gas industry, the application of epoxy phenolic coatings has been a dominant strategy to obtain high heat resistance from coatings and to mitigate corrosion under insulation (CUI) of both insulated carbon and stainless steel pipes operating up to 392°F (200°C). These coatings, however, are sensitive to overapplication, prone to cracking, and costly to repair when damaged.
This paper discusses cooling water treatment program metal-phosphate/phosphonate scale formation control efficacy when operating under stressed alkaline conditions (e.g., high temperatures, suspended solids, and iron).
The polarity of the zinc-steel galvanic couple in hot aqueous solutions was published more than 20 years ago. It used an inorganic zinc primer coating that was applied under thermal insulation at elevated temperatures [30C-60C (86F-140F)]. Since the year 2000, industrial practices or standards do not recommend using inorganic zinc rich coatings under thermal insulation. Research has showed over the years that good practice of corrosion prevention under insulation is to apply an additional layer of a heat resistant modified epoxy or inorganic polymer coating as an additional barrier.
This paper is a “high temperature” sequel to previous investigations of four specialty inorganic coatings said to prevent corrosion under wet insulation conditions with temperature cycling both in the CUI range of -5°C to 175°C and up to ca 400°C.
The increasing need for fossil fuels has resulted in more aggressive drilling and exploitation in oil and gas production industry. As new explorations at more extreme conditions (i.e. high temperature and high pressure) become more frequent, new challenges arise in terms of drilling equipment, operation conditions and safe production. Among those challenges, the mineral scale deposition, as one of the serious problems both for the surface and subsurface oilfields, can cause pipelines plugging, equipment failure and decrease in production efficiency, even emergency shutdown.