摘要
选取9对工作压力为1.0~6.5MPa、工作温度为400℃的标准带颈对焊管法兰,分别运用EN13445附录G法兰设计的另一方法与Waters方法计算螺栓预紧力,运用ANSYS有限元软件对其进行模拟,分析法兰接头的应力分布和应变,研究这两种计算方法在指导法兰接头螺栓安装时,法兰强度以及密封性的可靠程度和方法的可行性.结果表明:EN13445附录G计算确定的螺栓预紧力能保证该种法兰接头在该温度、压力范围内的强度与密封性,可用于指导该种法兰螺栓的安装;Waters计算确定的螺栓预紧力在较高工作压力时会导致垫片应力过大,可能会压溃垫片,建议在工程实际中该种法兰螺栓在该温度、压力范围内安装时谨慎使用Waters螺栓预紧力.
Nine pairs of standard welded necking pipe-flanges with working pressure of 1.0~6.5 MPa and working temperature of 400 ℃ were selected to calculate the pre-tightening force of the bolt with another flange design method given in annex G of EN13445 and Waters method,respectively.The finite element software ANSYS was used to simulate them,the stress distribution and strain of flange joints were analyzed,and the feasibility of the two methods and the reliability of the flange strength and sealing were studied to guide the installation of flange joint bolt.It was shown by verification that the bolt pretension determined by the method given in the annex G of EN13445 could ensure the strength and tightness of the flange joint within the temperature and pressure range and gives a guide to the installation of flange bolts.The bolt pretension determined by Waters method would cause excessive stress in the gasket working under higher pressure,and the gasket could be crushed.In the engineering practice,it would be recommended that the bolt pretension of Waters should be carefully used when the flange bolts were installed within the range of stipulated temperature and pressure.
作者
姜峰
黄鑫
武建生
JIANG Feng;HUANG Xin;WU Jian-sheng(College of Petrochemical Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Lanzhou Petrochemical Weida Company,Lanzhou 730050,China)
出处
《兰州理工大学学报》
CAS
北大核心
2019年第4期67-73,共7页
Journal of Lanzhou University of Technology
关键词
螺栓预紧力
应力分类强度设计
法兰密封
bolt pre-tightening force
strength design with stress classification
flange sealing
