The strain level in a deformed pipe wall has been included in recent years in the assessment of severity of dents in order to better prioritize and effectively repair mechanical damage in pipelines. High resolution caliper data provide accurate dent shape that can be used for determination of strains using commercial Finite Element Method (FEM) programs. However, those programs, designed to solve a variety of general problems, are very inefficient in calculation of strains in a pipewall with known radial displacements. This paper presents a very efficient method that combines analytical techniques with FEM approach. After properly filtering the caliper measurements the bending strain is calculated from the pipewall curvature, and the membrane strain is obtained using a FEM shell model that includes nodes with only two degrees of freedom in the mid-plane of the wall.
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2006 International Pipeline Conference
September 25–29, 2006
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
0-7918-4262-2
PROCEEDINGS PAPER
Calculation of Strains in Dents Based on High Resolution In-Line Caliper Survey Available to Purchase
Stanislaw A. Lukasiewicz,
Stanislaw A. Lukasiewicz
University of Calgary, Calgary, AB, Canada
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Jaroslaw A. Czyz,
Jaroslaw A. Czyz
BJ Pipeline Inspection Services, Calgary, AB, Canada
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Chao Sun,
Chao Sun
University of Calgary, Calgary, AB, Canada
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Samer Adeeb
Samer Adeeb
TransCanada PipeLines Limited, Calgary, AB, Canada
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Stanislaw A. Lukasiewicz
University of Calgary, Calgary, AB, Canada
Jaroslaw A. Czyz
BJ Pipeline Inspection Services, Calgary, AB, Canada
Chao Sun
University of Calgary, Calgary, AB, Canada
Samer Adeeb
TransCanada PipeLines Limited, Calgary, AB, Canada
Paper No:
IPC2006-10101, pp. 129-134; 6 pages
Published Online:
October 2, 2008
Citation
Lukasiewicz, SA, Czyz, JA, Sun, C, & Adeeb, S. "Calculation of Strains in Dents Based on High Resolution In-Line Caliper Survey." Proceedings of the 2006 International Pipeline Conference. Volume 2: Integrity Management; Poster Session; Student Paper Competition. Calgary, Alberta, Canada. September 25–29, 2006. pp. 129-134. ASME. https://doi.org/10.1115/IPC2006-10101
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