The conditions under which a pit defect is formed in a pipe can influence local stress concentrations which, in turn, affect the Magnetic Flux Leakage (MFL) signal. In this study MFL, Magnetic Barkhausen Noise (MBN) and neutron diffraction (ND) techniques are used to monitor and compare the local stress distributions surrounding simulated pits in plate and pipeline samples. Our study shows two important findings. Firstly, mechanically machining of simulated corrosion pits creates considerable machining stresses around the defect Conversely, electrochemical machining (ECM) produces no measurable residual stresses. Secondly, all three techniques indicate that, provided stresses are high enough hr produce local yielding, there are significant differences in local stress concentrations depending on whether the pit was electrochemically machined prior to stress application or while the sample was under stress. The latter case is more relevant to pipelines which corrode whilst in service since operating line pressures normally produce pipe wall hoop stresses of up to 70% yield strength.
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1998 2nd International Pipeline Conference
June 7–11, 1998
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
978-0-7918-4022-1
PROCEEDINGS PAPER
Variations in Stress Concentration Factors Near Simulated Corrosion Pits as Monitored by Magnetic Flux Leakage, Magnetic Barkhausen Noise and Neutron Diffraction Free
L. Clapham,
L. Clapham
Queen’s University, Kingston, ON, Canada
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K. Mandal,
K. Mandal
Queen’s University, Kingston, ON, Canada
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R. Sabet-Sharghi,
R. Sabet-Sharghi
Queen’s University, Kingston, ON, Canada
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D. L. Atherton,
D. L. Atherton
Queen’s University, Kingston, ON, Canada
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T. Holden,
T. Holden
National Research Council, Chalk River Laboratories, ON, Canada
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A. Teitsma,
A. Teitsma
Gas Research Institute, Chicago, IL
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P. Laursen,
P. Laursen
Pipetronix Ltd, Concord, ON, Canada
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B. Mergeles
B. Mergeles
Pipetronix Ltd, Concord, ON, Canada
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L. Clapham
Queen’s University, Kingston, ON, Canada
K. Mandal
Queen’s University, Kingston, ON, Canada
R. Sabet-Sharghi
Queen’s University, Kingston, ON, Canada
D. L. Atherton
Queen’s University, Kingston, ON, Canada
T. Holden
National Research Council, Chalk River Laboratories, ON, Canada
A. Teitsma
Gas Research Institute, Chicago, IL
P. Laursen
Pipetronix Ltd, Concord, ON, Canada
B. Mergeles
Pipetronix Ltd, Concord, ON, Canada
Paper No:
IPC1998-2058, pp. 505-512; 8 pages
Published Online:
October 21, 2016
Citation
Clapham, L, Mandal, K, Sabet-Sharghi, R, Atherton, DL, Holden, T, Teitsma, A, Laursen, P, & Mergeles, B. "Variations in Stress Concentration Factors Near Simulated Corrosion Pits as Monitored by Magnetic Flux Leakage, Magnetic Barkhausen Noise and Neutron Diffraction." Proceedings of the 1998 2nd International Pipeline Conference. Volume 1: Risk Assessment and Management; Emerging Issues and Innovative Projects; Operations and Maintenance; Corrosion and Integrity Management. Calgary, Alberta, Canada. June 7–11, 1998. pp. 505-512. ASME. https://doi.org/10.1115/IPC1998-2058
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