Static metal sealing mechanism of a subsea pipeline mechanical connector
Static metal sealing mechanism of a subsea pipeline mechanical connector
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海底管道机械连接器的静态金属密封机构
DOI：
10.1177/1687814016654821
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发表时间：
2016-07-01
影响因子：
2.1
通讯作者：
Li, Shaokai
中科院分区：
文献类型：
--
作者：
Wei, Zongliang;Wang, Liquan;Li, Shaokai
海底管道机械连接器的结构设计中，金属静密封机理是必不可少的。通过对密封机理和密封面接触压力的分析，得到了密封的临界条件。根据弹性力学的叠加原理，推导出保证密封的临界平均接触压力公式。临界平均接触压力的有限元分析结果与有限元分析结果吻合较好，临界平均接触压力随管壁厚度和密封宽度的增加而减小，而管半径对临界平均接触压力的影响较小，8英寸海底管道机械接头的临界平均接触压力为223.34 MPa，利用ANSYS软件对海底管道机械接头进行了设计。内压试验表明，最终设计的海底管道机械连接件的密封性能高于4.5MPa的设计压力，而初始设计的海底管道机械连接件均不能达到4.5MPa的设计压力。通过对管道表面密封压痕的观察，当平均接触压力大于临界平均接触压力且接触压力变化较小时，管道表面完全接触形成密封。最后通过振动试验验证了振动次数大于107次，最终设计的海底管道机械连接器满足试验要求。
The static metal sealing mechanism is essential for the structural design of subsea pipeline mechanical connector. By analyzing the sealing mechanism and contact pressure on sealing face, the critical condition of the seal is obtained. Based on the superposition theorem of elasticity, the formula of critical mean contact pressure ensuring seal is deduced. The finite element analysis result of critical mean contact pressure agrees with the analysis result very well and the critical mean contact pressure decreases with the increase in pipeline wall thickness and sealing width; however, the radius of pipeline has less influence on it. The critical mean contact pressure of 8-in subsea pipeline mechanical connector is 223.34 MPa and subsea pipeline mechanical connector is designed with ANSYS. The internal pressure experiments indicate that the sealing performance of final designed subsea pipeline mechanical connectors is higher than the design pressure of 4.5 MPa and all the initial designed ones cannot seal up to 4.5 MPa. By observing the sealing indentation on pipeline surface, when the mean contact pressure is higher than the critical mean contact pressure and the contact pressure variance is smaller, a full contact is seen to form a seal. Finally, the vibration experiments prove that the number of vibration is more than 107 and final designed subsea pipeline mechanical connector meets the experiment specification.