垫片外缘最大应力对螺栓法兰连接结构泄漏率影响

The effect of maximum stress located at gasket outer periphery on leakage of bolted flanged connections

螺栓法兰连接广泛的应用于石油化工等过程装备中,其是最重要的静密封连接形式之一,失效的主要原因是泄漏。利用有限元法对垫片的平均应力和外缘最大应力关系进行分析研究;采用解析方法预测螺栓法兰连接结构的泄漏率,并与试验结果进行对比,研究了垫片外缘最大应力与泄漏率之间的关系。结果表明,随着螺栓载荷的增加,法兰偏转程度增加,垫片平均应力与垫片外缘最大应力的差值逐渐增大;垫片外缘最大应力较平均应力对连接结构泄漏率影响更大。

The bolted flanged connection is one of the most important sealing connections in petrochemical industry,and leakage is the primary reason of the connections failure.The relationship between average gasket stress and maximum gasket stress located at the gasket outer periphery was analyzed by FEM method.And the leakage of bolted flanged connection was predicted,which results were investigated and compared with the experimental result.Then the effect of maximum gasket stress located at the gasket outer periphery on connection leakage was studied,which results indicate that the difference value of average gasket stress and maximum gasket stress increases gradually along with increasing of bolt load.The maximum gasket stress located at the gasket outer periphery is found to be a key parameter that controls leakage.