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Effect of Surface Imperfection affecting Long-term Durability of Coating Performance on Offshore Coating System

Picture for Effect of Surface Imperfection affecting Long-term Durability of Coating Performance on Offshore Coating System
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In case of Off-shore platforms there are operated for more than 25 years in severely corrosive environment. It is necessary to keep high quality coating performance for long-term operation period without maintenance.The performance of a coating is significantly influenced by its ability to adhere properly to the substrate material and steel preparation is the essential first stage treatment of a substrate before the application of any coating.With regard to steel preparation ISO 8501-3 specifies preparation grade of welds edges and other area with surface imperfection. The interpretation of preparation grade vary with depending on requirement level of client because it is visual assessment standard not quantitative.To study the effect of surface imperfection affecting long-term durability of coating performance on offshore coating system the carbon steel surface was prepared by different preparation grade based on ISO 8501-3 type of imperfection about weld profile weld porosity and thermally cut edge.This study will look at the correlation between surface imperfection and coating performance on the basis of NORSOK M-501 and ISO 20340 test method including ageing resistance and sea water immersion test for 6 months.Keywords: Off-shore platform ISO 8501-3 surface imperfection weld profile weld porosity thermally cut edge NORSOK M-501 ISO 20340 ageing resistance sea water immersion

Product Number: 51319-12884-SG
Author: Chuljung Kim
Publication Date: 2019
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Picture for Effect of Steel Surface Roughness on Coating Performance
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Effect of Steel Surface Roughness on Coating Performance

Product Number: 51319-12830-SG
Author: Russell Draper
Publication Date: 2019
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This paper describes experimental work investigating the influence of steel surface roughness on the adhesion performance of fusion bonded epoxy (FBE) pipeline coatings. The paper begins with a summary of the standards and methods that can be used to measure surface roughness. Several parameters are used to characterize the roughness of a blast cleaned steel including profile peak height and peak count. Tortuosity and rugosity indicate the proportional increase in steel surface area developed by roughening the surface. Normal pipeline coating industry practice is to specify and control a single roughness parameter termed “surface profile”. It is measured with replica tape and corresponds to the maximum peak-to-valley height.In the experimental work steel panels were abrasive blast cleaned with various steel shot and grit abrasives and the roughness characteristics of the blast cleaned surface were measured with stylus profilometers conventional replica tape and 3D imaging of replica tape.A FBE pipeline coating was applied to the prepared steel panels. The adhesion performance of the FBE coating was evaluated using the following test methods.<ul><li>Hot water immersion adhesion rating per CSA Z245.20 section 12.14 </li><li>Pull-off adhesion strength after hot water soak exposure per ASTM 4541 </li><li>Cathodic disbondment radius at 65 and 80 °C per CSA Z245.20 section 12.8 </li><li>Time before blisters were observed in Atlas Cell per NACE TM0174 modified </li><li>Average blister diameter in Atlas Cell </li><li>Pull-off adhesion strength after Atlas Cell exposure per ASTM 4541 </li></ul>The experimental data were analyzed using statistical techniques to investigate the relationship between the measured surface roughness and the adhesion test results. The adhesion results were found to be positively and linearly correlated with substrate tortuosity and rugosity. Profile peak height and peak count were found to contribute to tortuosity.
Picture for 04003 Early Coating Failures on Offshore
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04003 Early Coating Failures on Offshore Platforms

Product Number: 51300-04003-SG
ISBN: 04003 2004 CP
Author: James N. Britton, Deepwater Corrosion Services
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Picture for 07004 Effects of Surface Preparation Methods and Protective Coating Types on the Performance of Erec
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07004 Effects of Surface Preparation Methods and Protective Coating Types on the Performance of Erection Joint Weld Seams in Water Ballast Tanks

Product Number: 51300-07004-SG
ISBN: 07004 2007 CP
Author: Chung Seo Park, Sung Mo Son, Chil Seok Shin, Mong Kyu Chung and Kwang Ki Baek
Publication Date: 2007
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