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This paper evaluates the resistances to CUI of three types of coatings under severe CUI conditions using a vertical pipe test method. Certain possible improvements in the test method are also discussed.
Corrosion Under Insulation (CUI) has been recognized as a serious threat to safe plant operation. Severity of CUI varies depending on various factors such as operating conditions materials selection of the facilities coatings selection and thermal insulation system selection and so on.Among them selection of robust coating is one of the most effective methods to mitigate CUI. As typical examples of the coatings epoxy type inorganic copolymer type and Thermal Sprayed Aluminum (TSA) coatings are being adopted in oil and gas facilities in accordance with corrosion management philosophy of owners. However there are no reports which compare the performance (i.e. resistance against CUI) of these coatings under the same conditions.In this paper coating performance of three types of coatings used in recent oil and gas facilities are compared in accordance with the widely applied testing method. Finally based on the test results and recent experiences in design and construction of the facilities consideration for the coating evaluation and coating selection to mitigate CUI at design stage are proposed.
Key words: corrosion under insulation, heat resistant epoxy, inorganic copolymer, multipolymeric matrix, thermal sprayed aluminum, vertical pipe test, aluminum grade 1100, blackening
A laboratory investigation of corrosion under insulation (CUI) using methods given in ASTM G189 for cyclic temperature, wet/dry conditions. Two long term exposure tests of three material conditions and two insulative materials (mineral wool and calcium silicate insulations).
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Since 2002, a corrosion inhibiting chemistry package has been an integral part of two specific industrial insulations. This paper explains, at a molecular level, how this package engages a two-pronged defense (physical coating and pH buffering) against CUI.