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Sealing performance and Optimization of a Subsea Pipeline Mechanical Connector

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Chinese Journal of Mechanical Engineering 2018年第1期31卷 142-155页

作者： Li-Quan Wang Zong-Liang Wei Shao-Ming Yao Yu Guan Shao-Kai Li College of Mechanical and Electrical Engineering Harbin Engineering University Advanced Manufacturing Research Centre with Boeing The University of Sheffield

Researchers seldom study the optimum design of a mechanical connector for subsea oil-gas pipeline based upon the Sealing performance. An optimal design method of a novel subsea pipeline mechanical connector is presented. By analyzing the static metal sealing mechanism, the critical condition of the Sealing performance is established for this connector and the formulation method of the contact pressure on the sealing surface is created. By the method the minimum mean contact pressure of the 8.625 inch connector is calculated as 361 MPa, which is the constraint condition in the optimum design of connector.The finite element model is created in ANSYS Parametric Design Language(APDL) and the structure is optimized by the zero-order method, with variance of contact pressure as the objective function, and mean contact pressures and plastic strains as constraint variables. The optimization shows that variances of contact pressure on two sealing surfaces decrease by 72.41% and 89.33%, respectively, and mean contact pressures increase by 31.18% and 52.84%, respectively. The comparison of the optimal connectors and non-optimal connectors in the water pressure experiments and bending experiments shows that the sealing ability of optimized connectors is much higher than the rated pressure of 4.5 MPa, and the optimal connectors don’t leak under the bending moment of 52.2 kN·m.This research provides the formulation to solve contact pressure on the sealing surface and a structure optimization method to design the connectors with various dimensions.

关键词： Mechanical connector sealing mechanism Sealing performance Critical condition Minimum mean contact pressure Variance

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Effect of rotor-mounted protrusion on Sealing performance and flow structure in rotor-stator cavity

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Chinese Journal of Aeronautics 2018年第11期31卷 2057-2072页

作者： Nan CAO Xiang LUO Zeyu WU Jie WEN National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics School of Energy and Power EngineeringBeihang UniversityBeijing 100083China Collaborative Innovation Center for Advanced Aero-Engine Beijing 100083China

This paper presents an experimental investigation on the effect of protrusion radial position and height on the Sealing performance and flow structure in the rotor-stator cavity. The rotormounted protrusions are assembled at three radial positions and are set to three heights. The cavity is equipped with three rim seals: a radial seal, an axial seal and a seal with double fins on the stator.The annulus Reynolds number is set at 4:39 ×10;and the rotational Reynolds number ranges from 7:51×10;to 1:20×10;. Heat and mass transfer analogy is applied. Pressure and CO;concentration are measured. The experimental results show that in cavities with different rim seals, radial distributions of the sealing efficiency, pressure and swirl ratio are basically the same. The Sealing performance is improved by protrusions compared with the cavity without protrusion and improves with the increase of protrusion radial position and height. The effect of protrusion increases with the increase of the rotational Reynolds number. The windage loss and the flow resistance introduced by protrusions are investigated. It is found that induced windage loss and flow resistance decrease with the increase of protrusion radial position but increase with the protrusion height.

关键词： Height Protrusion Radial position Rim seal Sealing performance

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Sealing performance analysis of rubber core of annular BOP:FEM simulation and optimization to prevent the SBZ

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Petroleum 2023年第3期9卷 419-426页

作者： Liangliang Dong Yuan Tang Geng Tang Hai Li Ke Wu Wei Luo School of Mechanical and Electrical Engineering Southwest Petroleum University610500ChengduChina Engineering Technology Research Institute of Southwest Oil&Gas Field Company 618300DeyangChina Aecc South Industry Company Limited Zhuzhou412002China Sichuan Shengnuo Oil&Gas Engineering Technology Service Co. Ltd.618000DeyangChina

The present work studies the influence of oil pipe joint passing through annular blowout preventer(BOP)on its Sealing performance in high pressure gas wells under snubbing service.When the oil pipe joint passes through the BOP,due to the change of its structure,it is easy to cause the rubber core seal failure of the BOP,resulting in the leakage of toxic and harmful gas in the well,which seriously threatens the safety of the operators.Aiming at the problem of gas leakage caused by rubber core seal failure of annular BOP,based on the rubber large deformation theory and rubber core seal mechanism,a dynamic finite element model of rubber core-oil pipe joint is established,and the correctness of the model is verified by comparing the failure of rubber core on site;The results show that when the oil pipe joint passes through the BOP,a sealing buffer zone(SBZ)will be formed at the upper and lower shoulder of the joint,and the contact stress of the rubber core will decrease by 10 MPae30 MPa;Because of the funnel effect of the rubber core,the damage of the rubber core caused by the running oil pipe joint of the BOP is greater than that caused by the lift oil pipe joint;When lifting oil pipe,the existence of SBZ is easy to cause gas leakage in the well;The optimized structure of oil pipe joint with small inclination and long shoulder can significantly reduce the influence of SBZ on the Sealing performance of BOP.The research work in this paper is of great significance to improve the dynamic Sealing performance of BOP.

关键词： Annular blowout preventer Hyperelasticity Sealing performance Structural optimization FEM

考虑蠕变特性的航空发动机阀门用非金属垫片的密封性能研究

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风机技术 2023年第5期65卷 72-80页

作者：刘丽静郑娆李双喜李晔赵檀黄泽盛 Beijing University of Chemical Technology

The valve gasket for aero-engine is prone to creep under extreme conditions such as high temperature and high pressure.The creep failure of the gasket leads to valve leakage,which seriously threatens the safe and reliable operation of aero-engine.Aiming at the creep failure of FEP gasket in use,a timehardening creep model of valve gasket seal is established.The effects of time,operating pressure,material and structural parameters on the creep and sealing properties of FEP gaskets are analyzed.The results show that the compression rebound rate of gaskets decreases with the increase of time,and small compression rebound rate will decrease the Sealing performance.The creep behavior of FEP gasket increases with the increase of operating pressure.Reducing the fillet radius can reduce the probability of shear failure,but also reduce the contact stress.Increasing the height of the boss can reduce the deformation behavior of the gasket,but reduce the contact stress on the sealing surface.When the gasket bevel angle is 85°,the creep property and contact stress of the gasket are higher than those of other sizes.But large bevel angle leads to the gasket unsticking.Replacing the FEP material with the polyimide material can improve the creep resistance of gaskets and the contact stress of sealing surface.Considering the service life and sealing effect of gasket,the material is replaced with polyimide plastic,the fillet radius is 0.20mm,the bevel angle is 85°and the boss height is 0.2mm.

关键词： Creep Sealing performance Non-metallic Gasket

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Analysis of Factors Affecting Sealing performance of Subsea Wellhead Connector

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World Journal of Engineering and Technology 2022年第2期10卷 230-240页

作者： Liangliang Ding Miao Xian School of Mechanical and Electrical Engineering Southwest Petroleum University Chengdu China

Subsea wellhead connector is the key equipment for offshore oil and gas production. The working water depth is generally more than 500 m, so it has higher requirements for its Sealing performance. In this paper, the VX gasket matched with H-4 subsea wellhead connector is taken as the research object, and the mechanical analysis under preload and production conditions is carried out. The finite element model of subsea wellhead connector is established by ABAQUS software, and the influence of axial preload, production pressure and material properties on the Sealing performance of VX gasket is studied. The results show that the greater the axial preload, the greater the contact stress on the gasket surface;the contact stress decreases first and then increases linearly with the increase of production pressure;the material properties of the gasket are also an important factor affecting its Sealing performance, 316L stainless steel is more suitable for gasket material than 304 stainless steel and Inconel625.

关键词： Subsea Connector Sealing performance VX Gasket Contact Stress Finite Element Analysis

Gas Sealing performance test analysis of non-API casing connection with radial cone sealing structure

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Gas sealing performance test analysis of non-API casing conn...

ANALYSIS FOR THE EFFECT OF SHAPE OF CRIMPED PORTION UPON THE Sealing performance OF HYDRAULIC BRAKE HOSE BY THREE-DIMENSIONAL FEM

2012年海峡两岸破坏科学/材料试验学术会议

作者： XU Zhiqian YAN Yifei JANG Tingting YAN Xiangzhen College of Mechanical and Electronic Engineering China University of Petroleum College of Pipeline and Civil Engineering China University of Petroleum

The metal-to-metal radial interference fit construction is the main sealing structure of the non-API casing connection.The Sealing performance of the non-API casing connection is superior to the API casing because of the special sealing structure.So,the air tightness test has been done in order to find the sealing forming conditions and influencing factors.The main processing parameters of the test specimen are like the 7 inch casing connection.The main structure type is the cone-to-cone interference fit between two contact interfaces.The leakage rate was measured in the test under different contact pressure,different contact surface roughness and different contact width.The test results analysis show that the higher initial contact pressure is a necessary requisite to air seal.The contact interface has occurred plastic deformation when the contact pressure close to 2 times metal yield strength.In this condition,the leakage rate is unchanged with the increasing of gas pressure,the gas Sealing performance in a stable state. Comparing the gas Sealing performance of the different contact surface form processes(turning, grinding and lapping),we find that different surface roughness has different contact pressure in stable sealing state.The higher surface roughness come into stable sealing state much more quickly and easily comparing to the lower.Under the same contact and gas pressure and the same surface roughness,the leakage rate decrease dramatically with the increasing of the contact width, and the effect on the Sealing performance comes very small when the contact width more than 10 mm.

关键词： Sealing performance Leakage Rate Non-API Casing Connection Air Tightness Test

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ANALYSIS FOR THE EFFECT OF SHAPE OF CRIMPED PORTION UPON THE...

Numerical Analysis of Magnetic Fluid Sealing performance

第二届亚洲功能材料与结构力学大会

作者： Kento Ota Nao-Aki Noda Bongkee Kim Department of Mechanical Engineering Kyushu Institute of Technology1-1 Sensui-choTobata-kuKitakyushu-si804-8550 Japan

＜正＞Usually,automobile high-pressure hose,such as hydraulic brake hose,has been developed through investigating several actual prototype hoses experimentally.Recently,high durability for brake hose has been required because periodic renewing the brake hoses has not been requested anymore.In this study, FEM stress analysis has been applied to the crimped portion of hydraulic brake hose in order to promote the development of the automobile hoses more efficiently.The Sealing performance is discussed focusing on the normal stress between the nipple and inner rubber with varying several important geometrical dimensions of crimped portion.

关键词： Stress analysis Finite Element Method Sealing performance Brake Hose Automobile

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International Journal of Mining Science and Technology 2006年第1期16卷 53-56页

作者： ZHAO Meng, ZOU Ji-Bin, XU Yong-Xiang Department of Electrical Engineering, Harbin Institute of Technology, Harbin , Heilongjiang 150001, China Department of Electrical Engineering Harbin Institute of Technology Harbin Heilongjiang 150001 China

The Sealing performance of magnetic fluid is related to the magnetic fluid itself. Many factors can influence the magnetic field and the seal pressure differences of magnetic fluid seals, such as the sealing gap, the shaft eccentricity, the shaft diameter, the volume of the magnetic fluid and the centrifugal force. These factors are analyzed by numerical computation . When the seal material and structure are the same, the seal pressure difference is directly proportional to the magnetic field intensity and the saturation magnetization of the magnetic fluid. The Sealing performance of the magnetic fluid will reduce with the increase of the sealing gap and shaft eccentricity. The Sealing performance will in- crease with the volume of the magnetic fluid and decrease with the increase of the shaft diameter taking gravity into account. The increase of the shaft diameter is the same as the reduction of the volume of the magnetic fluid. The mag- netic fluid cross-section can change because of the centrifugal force. Some improvements can reduce the influence of the centrifugal force. The centrifugal force can be utilized to improve the Sealing performance.

关键词： magnetic fluid Sealing performance numerical computation

Novel numerical model to simulate water seepage through segmental gasketed joints of underwater shield tunnels considering the superimposed seepage squeezing effect

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Underground Space 2023年第6期13卷 104-120页

作者： Qixiang Yan Haojia Zhong Chuan Zhang Zechang Zhao Yanxin Wen Ping Wang Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China School of Transportation and Logistics Southwest Jiaotong UniversityChengdu 610031China China Railway Eryuan Engineering Group Co. Ltd.Chengdu 610031China

The water leakage through segmental joint gaskets has become a major concern that adversely affects the normal serviceability of underwater shield tunnels throughout the construction and operational periods.Therefore,it is of great significance to investigate the Sealing performances of the joint gaskets,which directly helps evaluate the waterproof capacity of underwater shield tunnels.To date,the numerical modeling plays an irreplaceable role in the analysis on the waterproof capacity of the joint gaskets.Nevertheless,conventional methods tend to ignore the self-sealing effect induced by the water seepage pressurization,thus failing to reveal the progressive evolution of the water infiltration process through the joint gasket.To remedy this defect,this paper proposed a novel numerical model to simulate the penetration process of the sealing gasket based on the Python language-enabled secondary programming in the ABAQUS software,which could fully consider the superimposed seepage squeezing effect.Based on the proposed model,the waterproof failure process and the dynamic contact stress of the gasket’s water seepage path subject to excessive hydraulic pressure were thoroughly investigated.Moreover,indoor tests on the waterproof capacity of the gasket were also performed to validate the proposed model.It is found that the numerical results from the developed model are consistent with the experimental results.This research will contribute to better understanding of the gaskets’hydraulic penetration process and more accurate prediction of the maximum waterproof capacity in underwater shield tunnels.

关键词： Underwater shield tunnel Hydraulic pressure Gasketed joint Water leakage Sealing performance Finite element method