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07022 ANALYSIS OF CDT METHODS AND FACTORS AFFECTING CATHODIC DISBONDMENT

Picture for 07022 ANALYSIS OF CDT METHODS AND FACTORS AFFECTING CATHODIC DISBONDMENT
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Product Number: 51300-07022-SG
ISBN: 07022 2007 CP
Author: Jiri Holub, Dennis T. Wong, and Marissa Tan
Publication Date: 2007
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A critical analysis of 22 Cathodic Disbondment Test methods used in the US, European Union, France, Germany, Saudi Arabia, China, Canada, Australia, New Zeeland and Other countries is presented in this paper. Parameters and Procedures used in these Standards are qualified and problems of their application discussed. ASTM G8, ASTM G42, ASTM G80 and four of their generic modifications, as well as CSAZ245.20, EN 10289, DIN 30 671 (1987), API RP 5L7 and AWWA C-210 (old) will generate comparable results, when run under same temperature and duration conditions. Also, CD results obtained with French Standard NF A 49-711 and its generic modifications will be comparable with CD values produced by these tests. Australian AS3862 and related AS/NZS 4352 will give approximately 15 – 20 % smaller cathodic disbondments. ASTM G95 and ISO 15711 (E) test will give larger disbondments owing to the tests’ durations.
A critical analysis of 22 Cathodic Disbondment Test methods used in the US, European Union, France, Germany, Saudi Arabia, China, Canada, Australia, New Zeeland and Other countries is presented in this paper. Parameters and Procedures used in these Standards are qualified and problems of their application discussed. ASTM G8, ASTM G42, ASTM G80 and four of their generic modifications, as well as CSAZ245.20, EN 10289, DIN 30 671 (1987), API RP 5L7 and AWWA C-210 (old) will generate comparable results, when run under same temperature and duration conditions. Also, CD results obtained with French Standard NF A 49-711 and its generic modifications will be comparable with CD values produced by these tests. Australian AS3862 and related AS/NZS 4352 will give approximately 15 – 20 % smaller cathodic disbondments. ASTM G95 and ISO 15711 (E) test will give larger disbondments owing to the tests’ durations.
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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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