Technical diagnostics of long-term operated main gas pipelines for the temporary storage and transportation of carbon dioxide
DOI:
https://doi.org/10.31471/2304-7399-2026-22(83)-210-221Keywords:
труба магістрального газопроводу, осьовий півеліптичний двовимірний дефект, зовнішній осьовий півеліпсоїдний тривимірний дефект, критич-ний коефіцієнт інтенсивності напружень KJc, JIc – критична тріщиностійкість, CO2.Abstract
The article investigates the failure conditions of long-term operated main gas pipelines with external axial corrosion and crack-like defects. The problem formulation considers external axial semi-elliptical (3D) corrosion pits and axial semi-elliptical (2D) cracks, taking into account the degradation of the physical and mechanical properties of the metal after prolonged service. An experimental-computational procedure is proposed, combining finite element modeling with local mesh refinement and the Transient Structural module to determine the stress-strain state in the vicinity of defects, along with fracture mechanics approaches for assessing the stress intensity factor and the material's critical fracture toughness. The model was applied to a 1420×15.5 mm main pipeline pipe manufactured from 10G2BT steel. The corrosion pit was modeled by removing a semi-ellipsoid, while the crack was modeled as a semi-elliptical slit on the external surface. Stress fields were obtained, plastic zone dimensions were estimated, and the conditions for the transition to ductile fracture were determined for both defect types, establishing their critical depths. These results are suitable for interpreting diagnostic data and evaluating the residual strength of aging gas pipelines considered for repurposing for CO2 transport and storage.
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