As the action of geological hazard, the buried steel pipe may bear axial compressive loads and cause buckling instability. At the same time, there will be a large number of external corrosion defects in long-term buried oil and gas pipelines. Corrosion defects have an important impact on the structural stability of pipelines, which is the main cause of structural failure of oil and gas pipelines. In order to research the bearing capacity of buried steel pipes with corrosion defects, the numerical simulation model of the buckling of X65 pipeline with corrosion defects under the combined load of internal pressure and axial compressive load is established by using ABAQUS finite element software. Meanwhile, considering the nonlinearity of the material model, the Ramberg-Osgood model is selected as the pipe material model. The bearing capacity analysis of the pipeline with corrosion defects under the combined load of different internal pressure and axial compressive load is carried out. The reliability of the simulation results is verified by the existing test results. The size of corrosion defect and the internal pressure of pipeline have significant influence on the bearing capacity of pipeline under axial compression load. However, there are few studies on the influence of the location of corrosion defects on the bearing capacity of pipelines under Internal pressure-axial compression load. Based on the accurate numerical simulation model, parameter sensitivity analysis is carried out to study the effects of corrosion defect location, defect size and pipeline internal pressure on pipeline bearing capacity. The variation of moment bearing capacity and ultimate strain of pipeline are analyzed quantitatively. The numerical simulation method used in this paper can better reflect the real service state of buried pipelines under the action of geological disasters. The research results have a certain reference value for the safety maintenance of buried pipelines under the action of geological disasters.

Key words: corrosion defect, axial compression, X65 pipeline, load capacity, pipe buckling


Axial Compressive Capacity of Pressurized Pipeline With Corrosion Defect

Division / Sponsors: 
Pipeline Systems Division

Paper Proceedings: https://asmedigitalcollection.asme.org/IPC/IPC2020/volume/84447

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