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Affected by a complex environment, corrosion is a common defect in steel pipelines. Moreover, steel pipelines are subjected to large axial forces during their installation and operation. Corroded deep-sea steel pipelines are prone to local buckling under complex loads. Therefore, in view of this problem, the collapse response of corroded steel pipe...
Citations
... Feng and co-authors [1] discussed a buckling analysis of corroded pipelines under the combined effect of axial force and external pressure. The simulated and experimental results indicate that corrosion plays an important role in the buckling of pipelines, especially in a subsea environment. ...
... Feng and co-authors [1] discussed a buckling analysis of corroded pipelines under the combined effect of axial force and external pressure. The simulated and experimental results indicate that corrosion plays an important role in the buckling of pipelines, especially in a subsea environment. ...
In addition to the development of ocean engineering, many ships and offshore structures have been constructed in recent years for use in shipping, oil and gas exploration, clean energy, mining and military purposes [...]
... In the previous work (Feng et al., 2022), a finite element model for a single corrosion defect pipeline was developed to study the influencing factors of the collapse pressure of a single corrosion defect pipeline under the combined action of external pressure and axial force. Moreover, a full-scale dual corrosion defect pipeline collapse experiment was carried out to verify the accuracy of the finite element model. ...
... Moreover, a full-scale dual corrosion defect pipeline collapse experiment was carried out to verify the accuracy of the finite element model. Different from the work of Feng et al. (2022), the interaction between multiple corrosion defects are investigated in this study based on a multi-corrosion defect pipeline finite element model. experimental results are used to verify the accuracy of the pipeline finite element model proposed in this study. ...
The pipeline is prone to collapse under the combined external pressure and multiple corrosion defects. Experiments of the full-scale pipelines with longitudinally, circumferentially and diagonally dual defects are conducted, respectively. Finite element models are established to simulate the experimental process, and achieved good consistency. Then the influences of corrosion defect dimensions on the interaction are analyzed, and the corresponding critical spacing is determined. Moreover, the collapse modes of the pipeline under different defect forms are studied. The collapse mode of the pipeline with two external corrosion defects changes from U-shaped to ∞-shaped mode. However, the collapse modes for the pipeline with internal and external corrosion defects or two internal corrosion defects are irregular and the deformation is mainly concentrated on the region of corrosion defects. In addition, the critical pressure of the pipeline is sensitive to the defect distribution type (distributed axially, circumferentially, or diagonally along the pipeline, etc.). Finally, a formula for estimating the collapse pressure of the pipeline with dual corrosion defects is proposed. The comparison between the proposed formula and finite element results proves that this formula can be used for the collapse pressure of the pipeline with multiple corrosion defects in a slightly conservative manner.
The subsea pipeline is prone to corrosion due to the combined influence of a complex environment and internal fluid. The corrosion defect results in the local thinning of the wall thickness of the pipeline, affecting the pipeline collapse response under external pressure. In the present study, the buckling response of subsea pipelines with irregular corrosion defect is analyzed. First, a method for calculating the critical buckling pressure of pipelines with irregular corrosion defect is proposed. The accuracy of the proposed method is verified by comparing it with finite element (FE) results and experimental tests. Then, the effects of defect size, steel grade and diameter-to-thickness ratio on the defect interaction and critical buckling pressure of the pipeline are explored. Finally, the application range of the present method is extended by considering defect length, initial ovality and internal pressure.
