摘要
高温对螺栓(螺柱)法兰连接系统的影响包括法兰性能下降、垫片和螺栓(螺柱)材料性能的降低、热膨胀和蠕变。这些影响导致预紧时垫片上的密封比压降低,使得系统密封性下降。其中螺栓(螺柱)蠕变、热膨胀造成螺栓(螺柱)应力松弛,是导致法兰连接系统泄漏的主要因素之一。因此提出了一种通过降温、降应力从而延缓螺栓(螺柱)材料蠕变速度的措施。主要是利用中空螺栓(螺柱)和较大直径螺栓(螺柱)实现降温和降应力目的,并给出了详细的设计步骤。
The effects of high temperature on bolted flange joints include material degradation,thermal expansion,and creep offanges,gaskets,and bolts.These effects lead to a decrease in the sealing pressure on the gasket during the pre-tightening condition,resulting in a decrease in the sealing performance of the system.Bolt stress relaxation caused by bolt creep and thermal expansion is one ofthe major factors leading to leakage of bolted flanged joints.A measure based on cooling and stress reduction has been proposed to delay the creep rate ofbolt materials.The use of hollow bolts and larger diameter bolts to achieve the purpose of cooling and stress reduction and detailed design steps were provided with design details and steps.
作者
宛张洪
蔡洪涛
顾尚潮
李晓辉
WAN Zhang-hong;CAI Hong-tao;GU Shang-chao;LI Xiao-hui(School of Mechanical and Electrical Engineering,Wuhan Institute of Technology,Wuhan 430074,China)
出处
《石油化工设备》
2025年第2期38-41,共4页
Petro-Chemical Equipment
关键词
高温法兰
蠕变
应力松弛
改进
设计
high-temperature flange
creep
stress relaxation
improvement
design
作者简介
宛张洪(2003-),男,湖北黄梅人,在读大学生,专业为过程装备与控制工程;通信作者:蔡洪涛(1966-),男,湖北应城人,副教授,硕士,研究方向为石油化工设备的结构与强度。E-mail:1870058292@qq.com。
