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Research Progress of Dented Pipelines

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Abstract

Dents are one of the most common defects in oil and gas pipelines that can reduce the load-bearing capacity of pipelines. Compound dents have an even greater impact on the load-bearing capacity. This paper summarizes the latest evaluation methods at home and abroad for dented pipelines. The research status of dented pipeline bearing capacity under typical loads such as internal pressure, bending moment, and axial force is presented in terms of experimental data and finite element analysis. The research suggests that the evaluation of residual strength of dented pipeline needs to be combined with finite element simulation. Full-scale tests on dented high-grade steel pipelines with large diameters under complex loads are needed. Parametric analysis should be carried out to comprehensively analyze the influencing factors and laws of pipeline residual strength. A fitting formula for limit load under different working conditions needs to be determined, to lay a foundation for dented pipeline engineering evaluation and residual strength prediction.

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Abbreviations

\(D_{o}\) :

Outer diameter of the pipe

t rd :

Uniform thickness away from the local metal loss location

t c :

Wall thickness away from the damaged area

\(d_{{{\text{dp}}}}\) :

Dent depth with internal pressure

\(d_{{{\text{d0}}}}\) :

Dent depth without internal pressure

L d :

Dent length

\(L_{{{\text{msd}}}}\) :

Distance to a major structural discontinuity

\(L_{w}\) :

Distance to the nearest weld joint

MAWP/MAOP:

Maximum allowable working/operating pressure

MAWPr :

Reduced maximum allowable working pressure

SMYS:

Specified minimum yield strength

UTS:

Ultimate tensile strength

RSF:

Remaining strength factor

RSFa :

Allowable remaining strength factor

P d :

Design pressure

P max :

The maximum pressures of the cycle

P min :

The minimum pressures of the cycle

\(CVN_{2/3}\) :

Charpy V-notch impact energy of a 2/3 sub-size specimen

d g :

Maximum depth of the gouge

d c :

Maximum depth of the corrosion

d m :

Maximum depth of the metal loss

\(\sigma_{{{\text{ys}}}}\) :

Specific minimum yield strength

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Acknowledgment

The authors sincerely appreciate the funding support provided by Fundamental Research Funds for the Central Universities (2-9-2021-015). The reviewers whose comments and suggestions helped improve our research are also gratefully appreciated.

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  1. School of Engineering and Technology, China University of Geosciences Beijing, Beijing, China

    Xiao Tian

  2. University of Science and Technology Beijing, Beijing, China

    Min-xu Lu

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Tian, X., Lu, Mx. Research Progress of Dented Pipelines. J Fail. Anal. and Preven. 22, 868–877 (2022). https://doi.org/10.1007/s11668-022-01420-x

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