Understanding mechanical properties critical to project economics

Kuruvila Varughese Herberts-O'Brien Inc. Houston An FBE coated panel is being checked in this impact-test equipment (Fig. 1). This second of two articles continues an effort to clarify the role of corrosion coatings' mechanical properties in controlling the economics of pipeline construction. Part 1 of this article (Sept. 9, p. 41) discussed flexibility; the conclusion deals with impact resistance, adhesion, and abrasion resistance. These properties are distinct from coatings' more important corrosion-protection properties: cathodic disbondment, surface wetting, chemical adhesion, oxygen and water-transmission coefficients, and hot-water absorption.1 A clear und...

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