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  Title Prediction of the internal corrosion remaining life of a gas pipeline made of high-strength steel
  Author(s) Dr Yue Cui, Prof. Hui-qing Lan, Dr Ren-yang He, and Prof. Chao-hui Zhang  
  Abstract DURING THE OPERATION of a high-strength steel compressible gas pipeline, the corrosion rates in the strongly turbulent position near the inner wall of the pipe are higher than the average corrosion rates. These changes lead to internal corrosion defects of the pipeline. In this work, a finite-element pipe model was built based on the working conditions of an X-70 pipeline in the West-to-East Natural Gas Transmission Project. The stress distributions in the inner-wall of the pipe under different types of semi- elliptical defects were calculated by a time-domain method with fluid-structure interaction. In the stress-distribution simulation, the failure-pressure formula of the high-strength steel pipe with semi-elliptical defects under the influence of the flow was fitted based on the Marquardt method. The prediction formula of the internal corrosion remaining life of the high-strength steel gas pipe was established according to the de Waard corrosion model modified by the flow. The prediction for the semi- elliptical defect parameters shows that depth has the strongest effect on the failure pressure of the pipe, whereas width has the least effect. Based on the formula obtained, the failure-pressure prediction of the pipe with defects under the influence of the flow was slightly lower than the experimental data under a simple internal pressure load. Under stable operating conditions, the inclination angle had the largest effect on the internal corrosion and remaining life of the high-strength steel gas pipeline. This prediction method provides an opportunity for more-targeted on-site inspections of long-distance gas pipelines made of high-strength steel.  
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