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When Undercover Agents are Tested to the Limit: Coatings in Action (CIA) and Corrosion Under Insulation (CUI) at High Temperature

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. 

Product Number: 41213-774-SG
Author: Mike O’Donoghue, Vijay Datta, Adrian Andrews, Sean Adlem
Publication Date: 2013
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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. 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.

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.

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