Failure assessment of X80 pipeline with interacting corrosion defects

Corrosion defects may compromise the safety of oil and gas pipelines. This paper investigates the failure behavior and failure pressure of X80 pipelines with longitudinally and circumferentially aligned interacting corrosion defects based on nonlinear finite element method, X80 pipeline with single corrosion defect is studied as well. On the basis of proposed failure pressure regression equations for X80 pipeline with single corrosion defect, this paper develops an assessment procedure for predicting failure pressure of pipeline with interacting corrosion defects. Through comparing predicted failure pressures using proposed solutions and assessment methods as well as experimental results available in previous literature, the accuracy of proposed solutions is demonstrated consequently.