含双点腐蚀腐蚀缺陷管道剩余强度和剩余寿命的分析
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摘要
借助ANSYS软件,以管道内双点腐蚀为研究对象,通过建立椭圆形双点腐蚀缺陷和正方形双点腐蚀缺陷,研究双点腐蚀缺陷在不同的缺陷深度、缺陷间距下管道最大等效应力与剩余强度的变化规律,并对其剩余寿命进行预测。结果表明:远离缺陷部位,等效应力分布均匀,最大等效应力发生在缺陷边缘区域;两种双点腐蚀缺陷等效应力均随缺陷深度的增大而增大,随缺陷间距的增大先减小而后保持不变,出现临界值;椭圆形双点腐蚀缺陷危害性大。所得结论可为管道的检修与替换提供可靠的数据支撑。
With the aid of ANSYS software, double point corrosion in pipelines is taken as the research object. Through establishing elliptical double point corrosion defects and square double point corrosion defects, this paper studies the maximum equivalent stress and the change law of residual intensity of the pipeline under different defect depths and defect spacing. It predicts the residual life as well. The results show that the equivalent stress distribution is uniform in the areas far from the defects and the maximum equivalent stress occurs in the edge area of the defect; the equivalent stress of the two kinds of double point corrosion defects increases with the increase of defect depth and with the increase of defect spacing, it decreases first and then remains unchanged and the threshold appears; the elliptical double point corrosion defect is more harmful. The conclusions can provide reliable data support for pipeline maintenance and replacement.
With the aid of ANSYS software, double point corrosion in pipelines is taken as the research object. Through establishing elliptical double point corrosion defects and square double point corrosion defects, this paper studies the maximum equivalent stress and the change law of residual intensity of the pipeline under different defect depths and defect spacing. It predicts the residual life as well. The results show that the equivalent stress distribution is uniform in the areas far from the defects and the maximum equivalent stress occurs in the edge area of the defect; the equivalent stress of the two kinds of double point corrosion defects increases with the increase of defect depth and with the increase of defect spacing, it decreases first and then remains unchanged and the threshold appears; the elliptical double point corrosion defect is more harmful. The conclusions can provide reliable data support for pipeline maintenance and replacement.
引文
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[2] 李思嘉,王杰. 含局部减薄缺陷X80长输管线的安全评定[J]. 当代化工,2014,43(1):118-121,131.
[3] 段庆全,于国鹏,张宏. 基于有限元的内腐蚀管道极限压力计算[J]. 油气储运,2009, 28(7):21-23.
[4] 杜四宏,刘海洪. 压力容器开孔接管区的有限元分析[J]. 中国化工装备,2010,(1):20-22, 26.
[5] 王禹钦,王维斌,冯庆善. 腐蚀管道的剩余强度评价[J]. 腐蚀与防护,2008,29(1):28-31.
[6] 刘啸奔,张宏,李勐,等. 含腐蚀缺陷N80油管的剩余强度分析[J]. 腐蚀与防护,2016,37(11):913-916,920.
[7] 赵新伟,罗金恒,路民旭. 含腐蚀缺陷管道剩余强度的有限元法分析[J]. 油气储运,2001,20(3):18-21.
[8] 崔铭伟,曹学文. 腐蚀缺陷对中高强度油气管道失效压力的影响[J]. 石油学报,2012,33(6):1086-1092.
[9] 王春兰,张鹏,陈利琼,等. 腐蚀管道剩余强度评价的基本方法[J]. 四川大学学报(工程科学版),2003,35(5):50-54.
[10] 黄维和. 原油管道外腐蚀风险评价[J]. 油气储运,2004,23(6):1-4.
[11] 王勖成,邵敏. 有限单元法基本原理和数值方法:第2版[M]. 北京:清华大学出版社,1997.
[12] 赵新伟,路民旭,白真权,等. 含裂纹管道剩余强度评价方法及其应用[J]. 石油矿场机械.1999,28(3):24-28.
[13] 刘墨山. 油气管道剩余强度有限元模拟分析及剩余寿命预测[J]. 科技导报,2009,27(6):34-37.