Seal Characteristics and Leakage Model of Metallic Large-Diameter Lenticular Gasket

Abstract

Through studying on the application principle of existing metal lenticular gasket, the structure design was finished, and design methods and calculating models of lenticular gasket larger than 6inch diameter were attained. Seal mechanism of the lenticular gasket and contact mechanics of the flange joint was analyzed by using finite element method. Stress state, contact width and contact deformation parameters of the lenticular gasket on working was obtained. Based on the analyzing results, leakage forecast model of metal lenticular gasket was presented. In the influencing factors of actual working state, such as inner pressure, outer pressure, medium viscosity, and surface roughness and so on, surface roughness is important, so surface machining precision of an in-use large-diameter lenticular gasket should be improved as far as possible. The conclusions will lay foundation for the future engineering application of large-diameter lenticular gasket.

Analytical calculation method for predicting contact loads and structural strength of metallic gasket of subsea connectors under thermal loads

“…For example, Wang et al 15 adopted the finite element method to design the metal gasket of a subsea connector and analyzed stresses of the gasket under different loads conditions. Gong et al 16 presented a finite element model to analyze the sealing characteristics of flange joints with a lenticular gasket by calculating the contact width, contact pressure and stresses, and presented the equations of leakage rate. Peng et al 17 introduced a subsea connector with a cone metallic gasket, established the calculation model for preloads in different conditions, and made an optimized design for the locking mechanism.…”

Analytical and experimental study on sealing contact characteristics of subsea collet connectors

“…17 In order to analyze this effect, the process can be divided into preloading mode and operating mode according to the load on the seal gasket. As shown in Figure 5, D k is the contact diameter, 171.9 mm; a is the angle of the sealing surface, 20°.…”