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09050 Relevance of Cathodic Disbondment Test for Evaluating External Pipeline Coatings at Higher Temperatures

Picture for 09050 Relevance of Cathodic Disbondment Test for Evaluating External Pipeline Coatings at Higher Tem
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Product Number: 51300-09050-SG
ISBN: 09050 2009 CP
Author: Alex Doiron and Sankara Papavinasam
Publication Date: 2009
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This paper investigates the applicability of cathodic disbondment (CD) test at higher temperatures, i.e., up to 150oC. This paper also presents different factors affecting applicability of the CD test at higher temperatures. It was found that CD Experiments are relevant for high-temperature coating evaluation up to 150oC. Maintaining temperature of the experimental pipe section simulates conditions as those of hot pipes. Slow evaporation of water occurs. The rate of water evaporation decreases in the presence of soil – the extent of which depends on the type of soil. Conducting the experiments in an autoclave is not an adequate way to conduct high-temperature CD tests because it does not simulate the temperature differentials that occur under pipeline operating conditions. While conducting long-term experiments care should be exercised to avoid evaporation of electrolyte. Evaporation can be prevented or minimized by refluxing the electrolyte, replenishing the electrolyte, or by covering the experimental set up. The thickness and thermal conductivity of a pipeline coating affect how much heat is transmitted from a hot pipe section to the soil it is in contact with.
This paper investigates the applicability of cathodic disbondment (CD) test at higher temperatures, i.e., up to 150oC. This paper also presents different factors affecting applicability of the CD test at higher temperatures. It was found that CD Experiments are relevant for high-temperature coating evaluation up to 150oC. Maintaining temperature of the experimental pipe section simulates conditions as those of hot pipes. Slow evaporation of water occurs. The rate of water evaporation decreases in the presence of soil – the extent of which depends on the type of soil. Conducting the experiments in an autoclave is not an adequate way to conduct high-temperature CD tests because it does not simulate the temperature differentials that occur under pipeline operating conditions. While conducting long-term experiments care should be exercised to avoid evaporation of electrolyte. Evaporation can be prevented or minimized by refluxing the electrolyte, replenishing the electrolyte, or by covering the experimental set up. The thickness and thermal conductivity of a pipeline coating affect how much heat is transmitted from a hot pipe section to the soil it is in contact with.
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51312-01108-A Test to Prescreen Coating Systems Prior To Cathodic Disbondment Testing

Product Number: 51312-01108-SG
ISBN: 01108 2012 CP
Author: Laurence W. McKeen
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Picture for Cathodic disbondment test: What are we testing?
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51312-01285-Cathodic disbondment test: What are we testing?

Product Number: 51312-01285-SG
ISBN: 01285 2012 CP
Author: Markus Betz
Publication Date: 2012
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The cathodic disbondment (CD) test is a well known and generally accepted laboratory test for pipeline coatings for a long time. What are we testing and what is the significance of the test? By means of basic investigations factors influencing cathodic delamination have been identified and their extent on the delamination radius has been assessed.
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51314-3860-High Temperature Cathodic Disbondment Testing for Pipeline Coatings

Product Number: 51314-3860-SG
ISBN: 3860 2014 CP
Author: Shiwei William Guan
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