The leakage analysis of submarine pipeline connecter based on a new fractal porous media model

Liu, Ming; Zhang, Lan; Wang, Liquan; Liu, Hengxu; Sun, Yongquan; Wang, Yingjun

doi:10.5004/dwt.2020.25291

Cited by 3 publications

(3 citation statements)

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“…Recently, Liu et al, proposed an observation length-dependent (OLD) mechanic model to calculate the real contact area for a frictionless contact between an elastic-perfectly plastic rough surface and a rigid plane [29]. In the model, the surface profile was determined by the WM function, and the contact of two rough surfaces can be idealized as a rigid plane pressed on a deformable rough surface, as shown in Figure 1a.…”

Section: The Old Modelmentioning

confidence: 99%

“…Guo et al, developed a magnification-based multi-asperity (MBMA) model by evolving magnification into the GW model, and the multilength nature of a rough surface was taken into account properly [28]. Liu et al, presented an observation length-dependent (OLD) model of rough contact without adhesion, which covered the shortage of the real contact area stops changing as the average stress reaches the plastic yield stress in the Perrson model [29]. Persson's magnification offers a new way to solve a number of rough contact problems, e.g., the leak rate of sealing [30,31], the influence of surface roughness on hydrophobicity [32], adhesion [33,34] and friction [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

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A Revised Continuous Observation Length Model of Rough Contact without Adhesion

et al. 2022

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The real contact area of rough surfaces has significant importance in many engineering applications, such as tribology, wear, lubrication and seals. A continuous observation length-dependent mechanic model of rough contact without adhesion is proposed, which assumes that the rough surface is divided into ideal subplanes. However, the model ignores the elastoplastic deformation of asperities, and the standard deviation of ideal subplanes’ heights is assumed to vary linearly with continuous observation length, which is not precise for all the surface fractal dimensions. In this work, a revised continuous observation length model is proposed with elastic, elastoplastic and fully plastic stages. The expressions of force and real contact areas are derived. For surfaces with different fractal dimensions, the quadratic polynomial, cubic polynomial and power relationships between standard deviation and observation length are proposed, respectively. In addition, the influences of the dimensionless observation length, fractal dimension and equivalent elastic modulus on the real contact areas in different contact stages are also analyzed. It can be concluded that the quadrate real contact area decreases as the dimensionless observation length decreases, which can be applied to the percolation theory for leak seal problems.

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Section: The Old Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Revised Continuous Observation Length Model of Rough Contact without Adhesion

et al. 2022

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“…In order to meet the requirements of connector sealing and strength, utilizing this model, the compression limit equation is further proposed. Reference [9] analyzed the leakage principle of the subsea connector and developed a new fractal porous media model. Besides, the permeability of the clamp connector can be worked out based on this media model and observation of the length-dependent mechanical model.…”

Section: Introductionmentioning

confidence: 99%

The Research and Experiments on Contact Sealing Theory of the Underwater Clamp Connector

et al. 2021

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With regard to the sealing structure characteristics of the underwater clamp connector, based on the Hertz contact theory, this article studies the method of solving the extreme value of the radius of curvature on the two curved surfaces at the sealing contact point; first, the method of calculating the extreme value of the radius of curvature at any surface point of the rotary part is obtained, and then the equivalent radius of curvature is solved. Using finite element simulation to study the contact sealing characteristics without considering the edge thickness and width of the sealing gasket, it is verified that the Hertz contact theory is applicable to the metal contact theory of underwater clamp connectors. Then, the sealing simulation with the influence of the detailed dimensions of the sealing gasket is compared with the theoretical result of the direct application of the Hertz contact theory in the underwater clamp connector contact, and the theoretical correction coefficient of metal contact seal for underwater clamp connectors is introduced to solve the errors. The pressure sealing experiment is carried out on six-inch flange and metal sealing gasket, which proves that the coefficient can greatly enhance the theoretical calculation accuracy of the contact sealing of the underwater clamp connector.

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Mechanical Behavior and Sealing Performance Study of Subsea Connector Core-Sealing Components under the Combined Action of Internal Pressure, Bending Moment, and Axial Load

Hao,

Yun,

Jiao

et al. 2023

JMSE

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A complete subsea production system (SPS) is assembled by interconnecting subsea manufacturing facilities through subsea connectors. To ensure the reliability and longevity of the SPS, it is imperative to thoroughly investigate the mechanical behavior and sealing performance of the subsea connector’s core-sealing components. In this study, the loading conditions of the subsea clamp connector are examined to analyze the load transfer relationship between its components under different modes. A mathematical model for the load transfer between locking torque and sealing contact pressure is developed for the preloading mode, and the concept of mechanical transfer efficiency is introduced. Another mathematical model for the load transfer between the locking torque and the design pressure is developed for the operation mode. Furthermore, a three-dimensional full-size finite element model of the subsea clamp connector is established to analyze the effects of complex loads on the mechanical behavior and sealing performance of its core-sealing components. The simulation results indicate that internal pressure loading positively affects the sealing of the subsea connector, and that the stress distribution in the core-sealing components under bending moment loading exhibits significant asymmetric characteristics. Additionally, the superposition of axial tensile loads reduces the effect of the bending moment on the strength of the core seal member but further weakens the seal. Finally, an experimental system is designed to validate the simulation results.

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The leakage analysis of submarine pipeline connecter based on a new fractal porous media model

Cited by 3 publications

References 0 publications

A Revised Continuous Observation Length Model of Rough Contact without Adhesion

A Revised Continuous Observation Length Model of Rough Contact without Adhesion

The Research and Experiments on Contact Sealing Theory of the Underwater Clamp Connector

Mechanical Behavior and Sealing Performance Study of Subsea Connector Core-Sealing Components under the Combined Action of Internal Pressure, Bending Moment, and Axial Load

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