A new method for assessment of burst pressure capacity of corroded X80 steel pipelines containing a dent

This work developed a new finite element (FE)-based method to perform pressure capacity assessment on a corroded X80 steel pipe containing a dent, where their mutual interaction and the effect on further corrosion growth were defined. Parametric effects including corrosion depth, dent depth, corrosion length and service time were determined. The presence of a dent at corrosion defect remarkably changes the local stress distribution, elevating stress to plastic range. The mutual interaction between the dent and the corrosion defect depends on both the initial corrosion depth and the initial dent depth. The interaction remarkably changes the local stress level at the dent and must be included in pipeline burst failure assessment.

Automated summary

This study developed a new finite element-based method to assess the pressure capacity of a corroded X80 steel pipe containing a dent, considering their interaction and the effect on further corrosion growth. The presence of a dent significantly changes the local stress distribution and elevates stress to plastic range. The interaction between the dent and the corrosion defect depends on the initial corrosion depth and the initial dent depth. This interaction must be included in the assessment of pipeline burst failure.