均匀腐蚀速率下内腐蚀管道最小剩余壁厚预测方法
发布时间：2018-11-26 18:12
【摘要】：对内腐蚀缺陷管道建立了三维非线性有限元模型,预测其失效压力,并分析管道壁厚、内压、缺陷尺寸对最小剩余壁厚的影响。研究结果表明:在均匀腐蚀速率下,管道壁厚、内压、缺陷深度和长度是影响最小剩余壁厚的主要因素,缺陷宽度影响较小,可以忽略缺陷宽度方向尺寸的变化;有限元计算的最小剩余壁厚与试验结果吻合较好;最小剩余壁厚与管道壁厚、内压近似呈线性关系,与缺陷长深比近似呈负指数关系。基于有限元计算结果,拟合得到最小剩余壁厚公式,其计算值与爆破试验结果接近,可以为管道剩余寿命评价提供参考。
[Abstract]:A three-dimensional nonlinear finite element model is established for the pipeline with internal corrosion defects, and the failure pressure is predicted. The influence of pipe wall thickness, internal pressure and defect size on the minimum residual wall thickness is analyzed. The results show that the wall thickness, internal pressure, defect depth and length are the main factors affecting the minimum residual wall thickness at uniform corrosion rate, and the defect width has little effect on the defect width. The minimum residual wall thickness calculated by the finite element method is in good agreement with the experimental results, and the minimum residual wall thickness is linearly related to the pipe wall thickness, the internal pressure is approximately linear, and the ratio of length to depth of the defect is approximately a negative exponential relationship. Based on the results of finite element method, the formula of minimum residual wall thickness is obtained, and the calculated value is close to the result of blasting test, which can provide a reference for the evaluation of residual life of pipeline.
【作者单位】： 中海石油(中国)有限公司湛江分公司;
【分类号】：TE988.2
，
本文编号：2359260
[Abstract]:A three-dimensional nonlinear finite element model is established for the pipeline with internal corrosion defects, and the failure pressure is predicted. The influence of pipe wall thickness, internal pressure and defect size on the minimum residual wall thickness is analyzed. The results show that the wall thickness, internal pressure, defect depth and length are the main factors affecting the minimum residual wall thickness at uniform corrosion rate, and the defect width has little effect on the defect width. The minimum residual wall thickness calculated by the finite element method is in good agreement with the experimental results, and the minimum residual wall thickness is linearly related to the pipe wall thickness, the internal pressure is approximately linear, and the ratio of length to depth of the defect is approximately a negative exponential relationship. Based on the results of finite element method, the formula of minimum residual wall thickness is obtained, and the calculated value is close to the result of blasting test, which can provide a reference for the evaluation of residual life of pipeline.
【作者单位】： 中海石油(中国)有限公司湛江分公司;
【分类号】：TE988.2
，
本文编号：2359260
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