A new method for predicting the failure pressure of locally corroded oil and gas pipelines

The increasing number of aging oil and gas gathering pipelines in China has significantly increased pipeline failure accidents due to local corrosion. However, so far no method was especially geared to calculating the failure pressure of locally corroded pipeline. This paper validated the reliability of nonlinear finite element method to assessing locally corroded pipeline. It has respectively investigated the effects of local corrosion morphology, corrosion radius, and corrosion depth on pipeline axial and hoop stress, failure position and failure pressure. Referring to stress concentration theory, meanwhile, combined with numerical simulation, this paper has established a new method for calculating the failure pressure of locally corroded pipeline, and comparing with B32G (modified), DNV-RP-F101, and recently developed method PCORRC this method has small and even distributed errors, and can meet the demand of predicting the failure pressure of locally corroded pipeline.