非柔性连接石化储罐配管温差应力分析与对策

储罐配管在温差作用下产生热位移会导致管壁产生热应力，未采用柔性连接的配管由于热应力集中作用可能发生破漏。针对与石油化工储罐非柔性连接的配管的安全问题，应用ANSYS有限元分析软件模拟计算石化企业典型配管的热应力分布；根据不同类型配管的分析结果，提出了工程技术与管理方面的针对性安全措施。研究结果表明:温差效应对石化储罐配管热应力影响显著，随内外温差的增加，配管应力集中的区域增大，最大热应力值增大；补偿措施能够改善配管的柔性，降低配管应力；约束载荷限制配管热膨胀从而增大配管应力；三通管是多根配管接合的区域，这种复杂管道交汇处会形成明显应力集中。研究结果对于提高石油化工非柔性连接配管安全性有一定的指导意义。

Analysis and countermeasures on temperature difference stress of piping with non-flexible connection in petrochemical storage tanks

The thermal displacement of piping in the storage tanks will be generated under the effect of temperature difference, which may cause the thermal stress on the pipe wall, and the break and leakage of piping without using the flexible connection may occur due to the effect of thermal stress concentration. To eliminate the potential safety hazards of piping with the non-flexible connection in the petrochemical storage tanks, the thermal stress distribution of typical piping in the petrochemical enterprises was simulated by using the finite element analysis software ANSYS. The targeted safety measures in the aspects of engineering technology and management were put forward according to the analysis results of piping with different types. It showed that the temperature difference effect had significant influence on the thermal stress of piping in the petrochemical storage tanks, with the increase of temperature difference between inside and outside, the stress concentration area of piping and the maximum value of thermal stress increased. The compensation measures could improve the flexibility of piping and decrease the stress of piping. The constraint load would restrict the thermal expansion of piping, thus increase the stress of piping. The tee was the connection area of multiple piping, and the obvious stress concentration would form at this type of position with complex pipes intersection. The results have a certain guiding significance for improving the safety of piping with the non-flexible connection in the petrochemical industry.