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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.
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. In the present work, two of the specialty coatings have been tested again, viz a one coat system of a titanium modified inorganic copolymer (TMIC) with aluminum flake pigmentation and a two coat system of a high performance modified silicone with MIO (Coating A). Carbon and stainless steel pipes were abrasive blasted to SSPC-SP10 near white metal and coated by spray application. The pipes were then insulated in high-water retention insulation (calcium silicate, CalSil) and subjected to a CUI microenvironment of cyclic wetting and heating for 6 weeks where the maximum temperature of each cycle was ca 560°C - 600°C. Laboratory investigations were undertaken to compare and contrast the CUI performance of TMIC vs Coating A and to more accurately determine the temperature profile of the coated steel pipe under wet insulation.
Corrosion under insulation (CUI) is a costly and complex problem for industry to contend with successfully. This paper describes a suite of accelerated laboratory tests undertaken in part to evaluate some of the claims made for engineered coatings touted to possess high heat resistance to 400°C and simultaneous anticorrosion properties.
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Corrosion Under Insulation (CUI) is a very serious problem impacting the oil and gas, petrochemical, power and heavy industries. Due to the high costs associated with CUI, many industries have begun abandoning conventional jacket insulation. Recent advancements in trade association standards have helped engineers select, apply and inspect different types of insulative coatings in lieu of conventional jacket insulation.
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.