Nonlinear finite element analysis of dented pipes under internal pressure and axial loads

Published on Feb 25, 2021
· DOI :10.1063/5.0038327
Parththeeban Murugathasan1
Estimated H-index: 1
,
Abu Hena Muntakim2
Estimated H-index: 2
,
Ashutosh Sutra Dhar9
Estimated H-index: 9
Sources
Abstract
The mechanical damages created on buried pipelines by any external activities are important consideration to assess the structural integrity of pipelines. The damages could be in the form of corrosion, dent, crack, gouge or any combination of these. A dent is a permanent inward plastic deformation in the pipe wall. The dents may not immediately cause failure of the pipe. However, it can reduce the pipe’s structural capacity and cause rupture or leak in the long run. The current researches focus on studying the behavior of dented pipe with respect to burst strength and fatigue life considering initial deformed shape. However, the effects of residual stresses formed during the formation of a dent on the performance of dented pipe are not extensively studied yet. In this study, finite-element modelling is used to understand the importance of residual stresses on the integrity assessment of dented pipe. The analysis results revealed that both residual stresses and stress history have significant effects on the structural capacity of dented pipes under internal pressure and axial loads.
References9
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#1Muntaseer Kainat (Enbridge)H-Index: 1
Last. Samer Adeeb (U of A: University of Alberta)H-Index: 18
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AbstractThe integrity assessment of dents in liquid pipelines, as regulated by codes and standards, is based mostly on depth and threat integration, with strain analysis incorporated as a nonmandat...
2 CitationsSource
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Nonlinear finite element analysis of axi-symmetrically dented/wrinkled pipe has been presented in this paper. The pipe including surrounding soil was modelled using three different approaches to indicate the effects of modelling approaches on the simulation of pipe behavior. In the first approach, pipe was modelled with the geometry of the dented/wrinkled pipe without consideration of any residual stress and stress history. In the second approach, residual stress was applied at the nodal points ...
1 CitationsSource
#1Hossein Ghaednia (U of W: University of Windsor)H-Index: 9
#2Kyle Gerard (U of W: University of Windsor)H-Index: 1
Last. Sreekanta Das (U of W: University of Windsor)H-Index: 13
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Pipeline is the common mode for transporting oil, gas, and various petroleum products. Structural integrity of oil and gas transmission pipelines is often threatened by external interferences such as concentrated lateral loads and as a result, a failure of the pipeline may occur due to “mechanical damages”. Sometime, this load may not cause immediate rupture of pipes; rather form a dent which can reduce the pressure capacity of the pipeline. A dent is a localized defect in the pipe wall in the f...
3 CitationsSource
#1Hossein Ghaednia (U of W: University of Windsor)H-Index: 9
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Pipeline is the common mode for transporting oil, gas, and various petroleum products. Buried linepipe can be exposed to various external interferences and corrosive environment and as a result, damage in the form of dent or corrosion or crack or gouge or combination of any of these damages can form in the pipe wall. Such damage or combined damages can reduce the pressure capacity of the pipeline. A defect combining dent and crack, often known as dent-crack defect, can develop in the wall of a b...
4 CitationsSource
3 Citations
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6 CitationsSource
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Abstract The origin of more than 90% in service pipeline failures is attributed to the presence of stress concentration areas such as defects in forms of gouges, dents, or when these defects are present together. These defects are provoked by external factors interferences, for instance by excavation machines. The influence of the dent depth on the burst pressure of the pipeline was evaluated. An approach based on a simple local strain criterion has been proposed to predict the damage and the fa...
51 CitationsSource
Abstract The pipeline defect assessment manual (PDAM) project is a joint industry project, sponsored by sixteen international oil and gas companies, to produce a document specifying the ‘best’ methods for assessing defects in pipelines. A dent reduces the static and cyclic strength of a pipe. Plain dents, dents on welds and dents containing defects are considered here; small scale and full scale tests, theoretical analyses and assessment methods are discussed, and the ‘best’ methods included in ...
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