Research Progress of Dented Pipelines

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.