长颈法兰偏转角的解析算法

螺栓法兰连接是石油、化工、核能、电力等部门压力容器和管道广泛采用的一种连接形式,其密封连接是否可靠直接关系到生产装置的安全运行和现场操作人员的安危。其失效极少是因强度不足引起的,泄漏是连接系统失效的主要原因。在真实螺栓法兰连接结构中,螺栓载荷和内压的作用使法兰发生偏转,法兰偏转引起垫片接触应力分布不均匀,垫片的局部接触应力对螺栓法兰连接结构密封性能的影响较垫片的平均压紧应力更大。文章在Warters法的基础上,考虑了操作压力的影响,对法兰变形进行理论分析,推导了法兰偏转角的计算公式,这为垫片接触应力分布的解析计算研究奠定基础。

Analytical Modeling of Rotation Angle of Flanges

Bolted flanged connections are widely used in pressure vessels and piping.The failure of sealing systems is mostly caused not by the strength of flanges or bolts but by the leakage of the connections.The leakage behavior of bolted flanged connections is related to the gasket contact stress.In particular,the non-uniform distribution of this stress in the radial direction caused by the flange rotational flexibility has a major influence on the leakage tightness of bolted flange connections.Based on Warters method and considering the operating pressure,the deformation of the flanges is analyzed theoretically,and the formula for calculating the angle of the rotation of flanges is derived.The analytical method presented in the paper can be used in the evaluation of contact stress of gaskets.