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Performance of Three Types of Coatings in a Simulated Corrosion Under Insulation Condition

Picture for Performance of Three Types of Coatings in a Simulated Corrosion Under Insulation Condition
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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.

Product Number: 51317--9296-SG
ISBN: 9296 2017 CP
Author: Junki Miyashita
Publication Date: 2017
Industry: Coatings and Linings
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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

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

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