法兰泄漏失效原因分析
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摘要
某压气站在生产运行过程中,工艺管道中的一只16MnD法兰发生了泄漏失效事故。为了分析该法兰泄漏失效原因,预防类似失效事故再次发生,对该失效法兰进行了磁粉检测、宏观分析、化学成分分析、金相试验、扫描电镜试验和有限元分析,试验分析结果表明:由于法兰与管道钢管连接处的焊缝存在错边,且该焊缝焊接质量较差,因而在振动载荷作用下,其焊缝错边处萌生了裂纹并疲劳扩展,最终导致该法兰泄漏失效。
Leakage failure of a 16 MnD flange in the process pipe occurred during the operation of a certain compressor station. In order to analyze the causes and prevent similar events, magnetic particle test, macroscopic observation, chemical composition analysis, metallographic examination, scanning electron microscopy and finite element analysis. The results show that because of the unfitness of flange and pipeline joint, and the poor quality of the welding seam, under the influence of vibration load, the fatigue crack initiates and propagates at unfitness of butt weld, eventually lead to the flange leakage failure.
Leakage failure of a 16 MnD flange in the process pipe occurred during the operation of a certain compressor station. In order to analyze the causes and prevent similar events, magnetic particle test, macroscopic observation, chemical composition analysis, metallographic examination, scanning electron microscopy and finite element analysis. The results show that because of the unfitness of flange and pipeline joint, and the poor quality of the welding seam, under the influence of vibration load, the fatigue crack initiates and propagates at unfitness of butt weld, eventually lead to the flange leakage failure.
引文
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[2] 姚起航,姚军.工程结构的振动疲劳问题[J].应用力学学报,2006,1(23):12-15.
[3] 罗金恒,杨锋平,王珂,等.油气管道失效频率及失效案例分析[J].金属热处理,2015,40(S):470-474.
[4] 李鹤林.油气管道失效控制技术[J].油气储运,2001,30(6):401-410.
[5] 孙杰,陆晓峰,朱晓磊.某法兰结构更换保温层层后的泄漏失效分析[J].润滑与密封,2017,42(12):110-125.
[6] 姚力,范吕慧,胡学知.承压设备磁粉检测技术发展现状[J].无损检测,2014,36(11):28-34.
[7] 张毅,黄小平,崔维成,等.对接接头焊趾应力集中有限元分析[J].船舶力学,2004,8(5):91-99.
[8] 姜爱华,陈亮,师红旗,等.螺栓疲劳断裂失效分析[J].热加工工艺,2013,42(2):222-223.
[9] 丁毅,钱发,陈刚.电机轴疲劳断裂失效分析[J].金属热处理,2001,26(12):48-49.
[10] 严正峰,李盖华,夏建新.拖拉机离合器蝶形弹簧疲劳断裂失效分析[J].金属热处理,2014,39(10):148-150.