Applicability of Residual Strength Evaluation Method for Gathering and Transportation Pipelines with Volume Defects

Based on the internal pressure blasting test data of the pipeline with a diameter-to-thickness ratio of 13-20, the failure criteria of the numerical calculation model of the gathering pipeline with corrosion defects were established, and the applicability of the three standard evaluation methods under different defect sizes was compared and analyzed. On this basis, based on the cross-validation optimized support vector machine (CV-SVM) algorithm, the failure pressure prediction model of gathering pipeline was established, and the prediction effect of the prediction model and the standard method was compared and analyzed. The results show that DNV-RP-F101 standard method was suitable for gathering and transportation pipelines with relatively small diameter thickness under different defect lengths, depths and widths. However, when the defect length was less than 1D(D was the outer diameter of the pipe), this method becomes conservative, and PCORRC standard method was recommended. Compared with standard methods, the accuracy of the prediction model increased by 3.11% which was suitable for the failure prediction of the gathering and transportation pipeline with corrosion defects.