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2 results on '"LI Yejiang"'

1. Research on optimal design of 6in offshore flange connector’s sealing structure

Author

Qin, Jianguo, Ji, Minghui, Gong, Haixia, Guo, Sijia, Zhang, Yanfeng, Li, Yejiang, Cen, Haitang, Qin, Jianguo, Ji, Minghui, Gong, Haixia, Guo, Sijia, Zhang, Yanfeng, Li, Yejiang, and Cen, Haitang

Abstract

Taking the maximum contact pressure as the objective function for, the optimal design model of the offshore flange connector was established to analyze the impact of the flange cone's angle and the curvature radius of the lenticular gasket's contact surface on the sealing performance of the connector. An optimized three-dimensional model of the offshore flange connector was constructed using the MATLAB software's fmincon function to obtain the optimal size of the cone angle and curvature radius. The maximum contact pressure and maximum equivalent stress values of the non-optimized and optimized offshore flange connectors under the cross combination of two design pressures and six operating temperatures were analyzed by Workbench software, and the sealing performance of the non-optimized and optimized offshore flange connectors was compared according to the sealing judgment basis. The results show that compared with the previously studied offshore flange connector, the sealing structure of optimized offshore flange exhibits maximum increase in contact pressure increase but maximum decrease in equivalent stress. Under actual operating circumstances, the optimized offshore flange connection performs better in sealing and is less prone to breakage.

Published
2024

2. Influence of Operating Temperature on the Sealing Surface of Subsea Flange Connector.

Author

QIN Jianguo, JI Minghui, GONG Haixia, LI Yejiang, and MEI Xiuzhuang

Subjects
SURFACE temperature, ROUGH surfaces, SURFACE roughness, FLANGES, FINITE element method
Abstract

For the leakage problem of the sealing surface of the subsea flange connector, the flow factors of the isotropic rough surfaces were used to modify the parallel plate leak model, and the relationship between the film thickness ratio and the leaking rat was established. By using MATLAB and COMSOL software, the contact surface entity was generated, three root-mean-square (RMS) roughness surfaces were analyzed by finite element method at four operating temperatures, and the relationship between the average contact pressure of rough surface and the film thickness ratio was obtained. The relationship between the average contact pressure and leakage rate of three rough surfaces at four operating temperatures was established by mathematical derivation and curve fitting. The results show that the operating temperature has a great influence on the surface quality requirements of the lenticular gasket. When the operating temperature is from 20 t to 100 t, the lenticular gasket with RMS roughness of 0. 4 μm can meet the requirements of the leakage rate index, while when the high temperature oil production operation is from 100 °C to 150 °C, only the RMS roughness of 0. 2 μm can meet the leakage rate index requirements. [ABSTRACT FROM AUTHOR]

Published
2023
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