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07020 SIMULATION OF COATING BEHAVIOR IN BURIED SERVICE ENVIRONMENT

Picture for 07020 SIMULATION OF COATING BEHAVIOR IN BURIED SERVICE ENVIRONMENT
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Product Number: 51300-07020-SG
ISBN: 07020 2007 CP
Author: A. Andrenacci and D. T. Wong
Publication Date: 2007
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A test apparatus, commonly used in the district heating market, has been successfully adopted to evaluate the functionality of various coating systems for their resistance to soil stress induced in the axial direction due to thermal changes in the pipeline. Coating systems investigated includes 2-layer polyethylene (2LPE), 3-layer polyethylene (3LPE), fusion bonded epoxy (FBE), cold-applied tape, heat shrinkable sleeve with mastic adhesive and heat-shrinkable sleeve with hot melt adhesives. The results showed that the most critical properties of a coating’s ability to resist soil stress are the cohesive strength and strong adhesive strength. Coating systems with a softer adhesive component are more sensitive to soil stress, particularly at their exposed edges. However, the study shows that proper selection of the coating system can meet soil stress requirements.
A test apparatus, commonly used in the district heating market, has been successfully adopted to evaluate the functionality of various coating systems for their resistance to soil stress induced in the axial direction due to thermal changes in the pipeline. Coating systems investigated includes 2-layer polyethylene (2LPE), 3-layer polyethylene (3LPE), fusion bonded epoxy (FBE), cold-applied tape, heat shrinkable sleeve with mastic adhesive and heat-shrinkable sleeve with hot melt adhesives. The results showed that the most critical properties of a coating’s ability to resist soil stress are the cohesive strength and strong adhesive strength. Coating systems with a softer adhesive component are more sensitive to soil stress, particularly at their exposed edges. However, the study shows that proper selection of the coating system can meet soil stress requirements.
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Picture for Evaluation of buried pipeline coatings under soil stress
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51312-01234-Evaluation of buried pipeline coatings under soil stress

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Picture for 07022 ANALYSIS OF CDT METHODS AND FACTORS AFFECTING CATHODIC DISBONDMENT
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07022 ANALYSIS OF CDT METHODS AND FACTORS AFFECTING CATHODIC DISBONDMENT

Product Number: 51300-07022-SG
ISBN: 07022 2007 CP
Author: Jiri Holub, Dennis T. Wong, and Marissa Tan
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Picture for 07021 MODIFIED CATHODIC DISBONDMENT TESTING OF EXTERNAL POLYMERIC PIPELINE COATINGS
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07021 MODIFIED CATHODIC DISBONDMENT TESTING OF EXTERNAL POLYMERIC PIPELINE COATINGS

Product Number: 51300-07021-SG
ISBN: 07021 2007 CP
Author: Sankara Papavinasam, Michael Attard, and R.Winston Revie
Publication Date: 2007
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The research described in this paper was carried out with the objective of establishing any correlation between coating performance and the results of cathodic disbondment testing. Experiments were carried out using 13 coatings. Nine samples of each coating were studied in a total of 117 experiments.
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