无反力臂扭矩拉伸法在石化高风险法兰紧固中的应用

APPLICATION OF TORQUE STRETCHING METHOD WITH NO REACTION ARM IN HIGH RISK FLANGE FASTENING IN PETROCHEMICAL INDUSTRY

螺栓法兰是广泛应用于石化企业的设备连接形式,也是泄漏易发部位。当前,炼化公司常用液压板手对螺栓进行紧固。但该方法不仅会增大螺纹之间的摩擦系数,甚至还会导致螺栓咬牙,影响接头的密封性能。文章介绍了无反力臂扭矩拉伸法应用实践情况,分析了该方法的紧固原理。在重整反应器中示范应用的结果表明:该方法不仅能够提高螺栓预紧力精度、确保法兰密封的可靠性,而且还极大地降低了VOCs的排放值,可以明显提高法兰密封接头的密封等级。

Bolted flange connection is widely used in petrochemical enterprises and it is also leak-prone part.At present,the hydraulic wrench is often used to tighten the bolts in refining and chemical companies,but this method will not only increase the friction coefficient between the threads,but also cause the bolt to clamp and affect the sealing performance of the joints.This paper introduces the application practice of the torque stretching method with no reaction arm and analyzes the fastening principles of the method.The results from the demonstration application in the reforming reactor show thatthis method can not only improve the accuracy of bolt preload and ensure the reliability of flange sealing,but also reduce VOCs emissionsgreatly,which can improve the sealing grade of flange sealing jointssignificantly.