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    Finite-Element Modeling of the Mechanoelectrochemical Interaction of Circumferentially Aligned Corrosion Defects on Elbows of Pipelines

    Source: Journal of Pipeline Systems Engineering and Practice:;2025:;Volume ( 016 ):;issue: 001::page 04024055-1
    Author:
    Peng Zhang
    ,
    Ming Zhao
    ,
    Siming Liu
    ,
    Tian Xu
    DOI: 10.1061/JPSEA2.PSENG-1630
    Publisher: American Society of Civil Engineers
    Abstract: Multiple corrosion defects on oil and gas pipeline elbows seriously threaten the safe and smooth operation of pipelines. In this work, a three-dimensional (3D) model of circumferentially aligned corrosion defects on the external surface of the elbow subjected to mechanoelectrochemical (M-E) interaction was developed. Subsequently, the M-E interaction law of circumferentially aligned corrosion defects under internal pressure was investigated. Then the influence of the geometries of circumferentially aligned corrosion defects on the M-E interaction was studied. The critical circumferential spacings between the defects were determined. The results indicate that due to the special characteristics of the elbow structure, the nonuniform distribution of stress under the action of internal pressure leads to different failure pressures at different locations of the elbow. The variation laws of defect width are the same as that of straight pipelines, under a fixed internal pressure or a defect depth, with the increase of the defect width, the maximum stress level and corrosion rate growth slow until both barely change. In addition, this work integrates the mechanical stress field with the electrochemical corrosion field, considering the specificity of the stress distribution in the elbow. A new interaction criterion to judge the critical circumferential spacing of the interaction between adjacent defects is defined. The new interaction criterion indicates that the circumferentially aligned corrosion defects of the elbow separate when neither the mechanical stress field nor the electrochemical corrosion field mutually interact, and can be evaluated as individual corrosion defects. This work complements the integrity evaluation model for elbows containing multiple corrosion defects and provides guidance for oil and gas piping systems integrity management.
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      Finite-Element Modeling of the Mechanoelectrochemical Interaction of Circumferentially Aligned Corrosion Defects on Elbows of Pipelines

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4304638
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    contributor authorPeng Zhang
    contributor authorMing Zhao
    contributor authorSiming Liu
    contributor authorTian Xu
    date accessioned2025-04-20T10:23:45Z
    date available2025-04-20T10:23:45Z
    date copyright9/28/2024 12:00:00 AM
    date issued2025
    identifier otherJPSEA2.PSENG-1630.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4304638
    description abstractMultiple corrosion defects on oil and gas pipeline elbows seriously threaten the safe and smooth operation of pipelines. In this work, a three-dimensional (3D) model of circumferentially aligned corrosion defects on the external surface of the elbow subjected to mechanoelectrochemical (M-E) interaction was developed. Subsequently, the M-E interaction law of circumferentially aligned corrosion defects under internal pressure was investigated. Then the influence of the geometries of circumferentially aligned corrosion defects on the M-E interaction was studied. The critical circumferential spacings between the defects were determined. The results indicate that due to the special characteristics of the elbow structure, the nonuniform distribution of stress under the action of internal pressure leads to different failure pressures at different locations of the elbow. The variation laws of defect width are the same as that of straight pipelines, under a fixed internal pressure or a defect depth, with the increase of the defect width, the maximum stress level and corrosion rate growth slow until both barely change. In addition, this work integrates the mechanical stress field with the electrochemical corrosion field, considering the specificity of the stress distribution in the elbow. A new interaction criterion to judge the critical circumferential spacing of the interaction between adjacent defects is defined. The new interaction criterion indicates that the circumferentially aligned corrosion defects of the elbow separate when neither the mechanical stress field nor the electrochemical corrosion field mutually interact, and can be evaluated as individual corrosion defects. This work complements the integrity evaluation model for elbows containing multiple corrosion defects and provides guidance for oil and gas piping systems integrity management.
    publisherAmerican Society of Civil Engineers
    titleFinite-Element Modeling of the Mechanoelectrochemical Interaction of Circumferentially Aligned Corrosion Defects on Elbows of Pipelines
    typeJournal Article
    journal volume16
    journal issue1
    journal titleJournal of Pipeline Systems Engineering and Practice
    identifier doi10.1061/JPSEA2.PSENG-1630
    journal fristpage04024055-1
    journal lastpage04024055-13
    page13
    treeJournal of Pipeline Systems Engineering and Practice:;2025:;Volume ( 016 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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