【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。更多还原

【Abstract】 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.更多还原