腐蚀管道寿命可靠性的步降应力加速试验研究

发布时间：2018-12-18 07:21

【摘要】：为保障油气管道安全运营,需研究腐蚀管道寿命的可靠性。首先基于管道失效机理,采用步降应力加速寿命试验(SDSALT)方法,获得不同温度下腐蚀率样本;其次利用加速因子和逆幂律加速方程建立数据折算模型,将腐蚀率样本转换为应力作用失效时间并截尾抽样后作为输入,求得含未知参数的准样本;然后通过准样本估计Weibull分布的3个参数,进而得到以温度和时间为自变量的管道可靠性函数;最后以H_2S/CO_2环境中运营的N80管道为例,验证所建腐蚀管道寿命预测方法的可靠性。结果表明,该方法大幅缩短试验时间,对管道寿命预测准确,并分析出管道可靠性的降低速度随温度和时间的增加先增大后减小,可应用于管道的适用性评价。
[Abstract]:In order to ensure the safe operation of oil and gas pipelines, it is necessary to study the reliability of corrosion pipeline life. Firstly, based on the failure mechanism of pipeline, the accelerated life test (SDSALT) method is used to obtain corrosion rate samples at different temperatures. Secondly, the data conversion model is established by using acceleration factor and inverse power law acceleration equation. The corrosion rate sample is converted into the failure time of stress action and the sample is cut off as input, and the quasi-sample with unknown parameters is obtained. Then the three parameters of Weibull distribution are estimated by quasi-samples, and the pipeline reliability function with temperature and time as independent variables is obtained. Finally, N80 pipeline operating in H_2S/CO_2 environment is taken as an example to verify the reliability of the life prediction method of the corroded pipeline. The results show that this method can greatly shorten the test time and predict the pipeline life accurately. It is also analyzed that the reducing speed of pipeline reliability increases first and then decreases with the increase of temperature and time, which can be used to evaluate the applicability of pipeline.
【作者单位】：西安建筑科技大学管理学院;
【基金】：国家自然科学基金资助(61271278) 陕西省重点学科建设专项资金资助(E08001) 陕西省教育厅自然专项基金资助(16JK1465)
【分类号】：TE988

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