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00773 COATING TRIAL AND SELECTION OF REHABILITATION COATINGS FOR LARGE DIAMETER PIPE

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Product Number: 51300-00773-SG
ISBN: 00773 2000 CP
Author: Aida Lopez, MsC., P. Eng., Yvanna Ireland, P. Eng., Kevin C. Garrity, P. E.
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Since 1996, a major North American pipeline company has been conducting large scale pipeline recoating in sections that are known to have coating problems due to coating degradation and/or aging, increasing operating temperatures and soil aggressiveness. In order to choose the best appropriate material, several coatings were put through an application trial on pipe using line-travel plural component spray equipment at a test facility in Houston, Texas. This paper describes the testing matrix that was used to evaluate the performance characteristics of various wet applied pipeline rehabilitation coatings. Attention was given to i) the field and practical application of each respective coating using the line-travel equipment and ii) the evaluation of the results of long term accelerated testing of the selected materials, specifically the cathodic disbondment resistance and other properties considered to be relevant, including impact resistance, abrasion and adhesion. Also testing data is provided from the actual field application that took place during the 1998 project. Key words: degradation, line-travel, rehabilitation, cathodic disbonding, impact resistance, abrasion, and adhesion.
Since 1996, a major North American pipeline company has been conducting large scale pipeline recoating in sections that are known to have coating problems due to coating degradation and/or aging, increasing operating temperatures and soil aggressiveness. In order to choose the best appropriate material, several coatings were put through an application trial on pipe using line-travel plural component spray equipment at a test facility in Houston, Texas. This paper describes the testing matrix that was used to evaluate the performance characteristics of various wet applied pipeline rehabilitation coatings. Attention was given to i) the field and practical application of each respective coating using the line-travel equipment and ii) the evaluation of the results of long term accelerated testing of the selected materials, specifically the cathodic disbondment resistance and other properties considered to be relevant, including impact resistance, abrasion and adhesion. Also testing data is provided from the actual field application that took place during the 1998 project. Key words: degradation, line-travel, rehabilitation, cathodic disbonding, impact resistance, abrasion, and adhesion.
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