SW6中法兰设计另一方法的工程应用  

Engineering Application of Alternative Method Provided in SW6 for Design of Flanged Joint

作　　者：秦叔经 Qin Shujing(National Technology Center of Process Equipment,Shanghai 200040,China)

机构地区：[1]全国化工设备设计技术中心站,上海200040

出　　处：《化工设备与管道》2021年第5期1-10,共10页Process Equipment & Piping

摘　　要：为保证法兰接头在正常操作工况下的密封性能,实际工程设备图纸上可能要求标注法兰接头安装时需要的螺栓力,而在对法兰螺栓进行疲劳分析时也需要得到各工况下的实际螺栓力。但当前GB/T 150标准和ASME规范中的法兰设计方法均无法算得满足密封要求的较正确的各工况下螺栓力。在软件SW6中,提供了一个基于标准EN 13445和HG/T 20582中关于法兰设计的另一方法(以下简称“另一方法”),该法兰设计方法可用来解决以上所述的两个问题。简单介绍了另一方法的基本原理,然后通过对几个标准法兰的工程应用进行核算,给出了它们各自在安装时需要的螺栓预紧力范围以及在各工况下的螺栓力。最后,对另一方法计算中需要的垫片系数Q_(0,min)和m与泄漏率之间的关系、法兰环转角对密封性能以及法兰螺栓应力的影响等进行了讨论。On assembly drawing in practical engineering,the bolt-tightening force is possibly needed to label so as to ensure the seal performance of flanged joint under operating condition.Moreover,in fatigue analysis of the bolts in flanged joint the actual bolt stresses under various conditions are also required.But by using current flange design methods provided in current standard GB/T 150 or ASME code,comparatively correct bolt forces under bolt-tightening and working conditions that can adapt to sealing requirement cannot be obtained.In SW6,there is an alternative method for design of flanged joint(it is labeled as“the alternative method”later)based on standards EN13445 and HG/T 20582,by which two problems stated above can be solved.In this paper,the principles in deduction of alternative method were briefly introduced.Then some examples for standardized flanges used under engineering conditions were calculated and checked for their sealing performance and strengths,from which the required bolt force scope in assemblage and the bolt forces under various conditions were resulted.Finally the relation between leakage rate and gasket parameters Q_(0,min)and m as well as the effects of the rotation of flange to the sealing performance of the joint and the stress in bolts were discussed.

关 键 词：法兰接头 密封性能 泄漏率 螺栓预紧力 

分 类 号：TQ050.2[化学工程] TH122[机械工程—机械设计及理论]