Analysis of effect of the nonlinear flow field on sealing performance of the underwater lenticular gasket for flange connection

作者：Gong, Haixia; Liu, Zhe^*; Shi, Changwei; Wang, Liquan

来源：Technical Bulletin, 2017, 55(12): 327-333.

• Additional bending moments
• External loads
• Flange connection
• Leakage rates
• Relational Model
• Sealing performance
• Theoretical study
• Vortex induced vibration

Due to external load produced by ocean current action, the flange connection system by lenticular gasket has been working in the seabed for a long time, the flange connection joint is vibration and bending, and eventually leads to the sealing failure of the flange connection system. In this paper, the expression that the influence of the additional bending moment caused by the vibration of the suspended span pipeline to the sealing contact stress of lenticular gasket is derived. Combined the relationship between the leakage rate and the contact stress of the lenticular gasket, a relational model between bending moment and seal leakage rate of lenticular gasket under the effect of flange preload is established. The analysis shows that the leakage rate increases with the increase of external load. Therefore, it's necessary to increase the bolt preload as much as possible to resist vibration. The theoretical study of this paper laid the foundation for the lenticular gasket to seal the suspended span pipeline.

• 出版日期2017
• 单位哈尔滨工程大学