Predicting Gasket Leak Rates Using a Laminar-Molecular Flow Model

Marchand, Luc; Derenne, M.; Masi, Vincent

doi:10.1115/pvp2005-71389

Cited by 12 publications

(8 citation statements)

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“…e maximum stress in the whole seal occurs at the welding between the stiffener and the cover, and the maximum stress in the bolt is also large. It is necessary to consider whether the bolt strength meets the requirements [13][14][15]. As the sealing performance is related to the stress at the contact surface, Figure 11 shows a schematic diagram of the stress distribution on the gasket contact surface varying with pressure under four pretensions.…”

Section: Finite Element Analysis Resultsmentioning

confidence: 99%

“…e physical parameters used in the calculation are as follows. e elastic modulus of the cover plate, lower flange, and cylinder is 210000 MPa and Poisson's ratio is 0.3. e elastic modulus of bolts and nuts is set to 203000 MPa, and Poisson's ratio is 0.3; e gasket is made of neoprene with a thickness of 5 mm, and its stress-strain curve is obtained by consulting the literature (refer to Figure 5) [13,14].…”

Section: Finite Element Analysis Modelmentioning

confidence: 99%

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Study on Leakage Model of Typical Penetration of Closed Structures Based on Porous Media Seepage Theory

Lin¹,

2022

Mathematical Problems in Engineering

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Quantitative prediction of penetration leakage rate has not been reported so far. The theoretical prediction method of leakage rate of typical penetration static seal structure of closed structure is studied. Based on porous media seepage mechanics, the relationship between leakage rate and microstructure parameters is established, and a new prediction model of the leakage rate of sealing structures is proposed. Then, the relationship between seal-specific pressure and microstructure parameters is obtained by the Hertz contact mechanics model. Finally, the leakage rate calculation, which is independent of any experimental data, is obtained innovatively. The new model is used to predict the leakage rate of penetration, and the theoretical prediction results are compared with the experimental measurement results. It is proved that the two agree well, which verifies the effectiveness of the model. The prediction model based on this method can well reflect the effects of rough surface morphology, material mechanical properties, sealing load, high temperature, and high pressure on the leakage rate. The leakage rate prediction model proposed in this paper is independent of the experimental regression coefficient and can realize the conversion relationship between different sealing media, sealing materials, and working conditions.

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Section: Finite Element Analysis Resultsmentioning

confidence: 99%

Section: Finite Element Analysis Modelmentioning

confidence: 99%

Study on Leakage Model of Typical Penetration of Closed Structures Based on Porous Media Seepage Theory

Lin¹,

2022

Mathematical Problems in Engineering

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“…Capillaries numbered at 1.92 × 10 10 and 9.33 × 10 9 for these two materials, respectively. Equations ( 17) and (18) were used-in conjunction with kerosene and water properties and Equation ( 14)-to predict leak rates through these two materials. Parallel experimental tests were conducted with these two liquids on both materials under the gland stresses and pressures given above.…”

Section: Resultsmentioning

confidence: 99%

“…For these reasons, most research has concentrated on the study of gas leaks. The researchers in [18,19] conducted tests with different gases to understand the behavior of porous gaskets and packing materials. Others predicted flow through porous media based on sophisticated modelling and simulations using the Monte Carlo method [20], with no practical use for gaskets and packing seals.…”

Section: Introductionmentioning

confidence: 99%

A Study on Liquid Leak Rates in Packing Seals

Bouzid

2021

Applied Sciences

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The accurate prediction of liquid leak rates in packing seals is an important step in the design of stuffing boxes, in order to comply with environmental protection laws and health and safety regulations regarding the release of toxic substances or fugitive emissions, such as those implemented by the Environmental Protection Agency (EPA) and the Technische Anleitung zur Reinhaltung der Luft (TA Luft). Most recent studies conducted on seals have concentrated on the prediction of gas flow, with little to no effort put toward predicting liquid flow. As a result, there is a need to simulate liquid flow through sealing materials in order to predict leakage into the outer boundary. Modelling of liquid flow through porous packing materials was addressed in this work. Characterization of their porous structure was determined to be a key parameter in the prediction of liquid flow through packing materials; the relationship between gland stress and leak rate was also acknowledged. The proposed methodology started by conducting experimental leak measurements with helium gas to characterize the number and size of capillaries. Liquid leak tests with water and kerosene were then conducted in order to validate the predictions. This study showed that liquid leak rates in packed stuffing boxes could be predicted with reasonable accuracy for low gland stresses. It was found that internal pressure and compression stress had an effect on leakage, as did the thickness change and the type of fluid. The measured leak rates were in the range of 0.062 to 5.7 mg/s for gases and 0.0013 and 5.5 mg/s for liquids.

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“…For the last decade, some progress has been made to understand the leakage behavior of bolted flange joints by analyzing the fluid flow through porous gasket materials and to develop analytical models to predict leaks [1][2][3][4]. However, these models are not representative of the true gasket porous behavior and have some restrictions in their use.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Experimental Studies of Liquid and Gas Leaks through Micro and Nano-Porous Gaskets

Grine¹,

Bouzid

2013

MSA

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The reliability of industrial installation requires minimum leakage of pressurized sealed joints during operation. At the design stage, the leakage behavior of the gasket must be one of the most important parameter in the gasket selection. The objective of the work presented in this paper is to develop an analytical leak rate prediction methodology used in gasketed joints. A pseudo analytical-experimental innovative approach was used to estimate the characteristics of the porous structure for the purpose of predicting accurate leak rate through gaskets with different fluids under conditions similar to those of operation. The analytical model assumes the flow to be continuum but employs a slip boundary condition on the leak path wall to determine the porosity parameters of the gasket. The analytical model results are validated and confronted against experimental data which were conducted under various conditions of fluid media, pressure, gasket stress and temperature. Two experimental test rigs fully automate that accurately reproduces the real leakage behavior of the gasketed joint have been developed to analyze the mechanical and thermal effects on the gasket flow regime. The gas leaks were measured with multi-gas mass spectrometers while liquid leaks were measure using a sophisticated detection system based on the pressure rise method.

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Predicting Gasket Leak Rates Using a Laminar-Molecular Flow Model

Cited by 12 publications

References 0 publications

Study on Leakage Model of Typical Penetration of Closed Structures Based on Porous Media Seepage Theory

Study on Leakage Model of Typical Penetration of Closed Structures Based on Porous Media Seepage Theory

A Study on Liquid Leak Rates in Packing Seals

Analytical and Experimental Studies of Liquid and Gas Leaks through Micro and Nano-Porous Gaskets

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