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Title: Combining high-resolution in-line geometry tools and finite-element analysis to improve dent assessments
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Catalog No.: 2323s
Date of Publication: 2014-06-01
Price: $25.00 US
Authors: Rhett L Dotson, Markus Ginten, Dr Chris Alexander, Julian J Bedoya, and Dr Kathrin Schroeer
Abstract: DENT SEVERITY IN THE pipeline industry has historically been characterized through parameters including depth, length, and width. Other approaches utilize techniques that estimate the strain in a dent based on the longitudinal and circumferential curvature. However these methods have shortcomings as they degenerate the geometry to a series of curve fits in two planes. Dents interacting with other anomalies and those that have atypical characteristics present particular challenges to both operators and in-line inspection vendors, as they do not fit the traditional analysis moulds described above. Advances in high-resolution caliper tools offer an improved means of dent assessment through the use of finite- element analysis, which can be performed on anomalies of any shape and size including those with interactions. This paper presents a case study where a plain dent was generated in the laboratory and characterized with an optical scanner and Rosen’s high-resolution geometry tool. Both sets of data were analysed using the general-purpose finite-element code ABAQUS to predict stress-concentration factors and expected strains under internal pressure. The analyses’ results were benchmarked to laboratory tests where strain gauges were used to measure the peak strains. The paper concludes by presenting how the process of conducting finite-element analysis has been streamlined to the point where it can be automated, and stress-concentration factors rapidly provided to operators in conjunction with standard ILI reports. This streamlined process now allows finite- element analysis to be used as a primary means of assessment to rank, prioritize, and mitigate dents.
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