Theoretical investigation of the compression limits of sealing structures in complex load transferring between subsea connector components

Abstract

This paper provides a theoretical method for calculating the compression limits of a subsea connector's sealing structure to prevent natural gas leakages. The amount of compression deformation is related to the compressive load between contact surfaces. Because of the different compressive loads on the gasket under preloading and operation conditions, the amount of compression will change. Therefore, the load transmission relations between subsea connector components are first analyzed under different working conditions, and the relationship between the sealing contact load and the locking force is obtained. Secondly, a contact model between the lenticular gasket ring and hubs is established on the basis of Hertz contact theory. An analytical equation for the amount of compression is deduced. Considering the demands for sealing and strength, compression limit equations are put forward. In order to apply the compression limits equations, an optimization model is built for a locking mechanism, and the structure design parameters of one certain subsea connector are optimized. This study provides a theoretical method and guidance for the structural design of subsea connectors with a metallic lenticular gasket.