Literature Research in Relevant Fields to Understand Pressure Relief Valve Leak Tightness in a Static Closed State

Anwar, Ali A.; Gorash, Yevgen; Dempster, William; Hamilton, Robert

doi:10.1016/j.proeng.2015.12.179

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…This paper presents an extended description 5 of the investigation by Gorash et al (2015) into static sealing and how advanced computational techniques might be used to understand and improve the design of static seals. In this paper only structural behaviour issues associated with conventional spring loaded safety valves have been investigated when metal-10 to-metal sealing is required.…”

Section: Problem Statementmentioning

confidence: 99%

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Study of mechanical aspects of leak tightness in a pressure relief valve using advanced FE-analysis

Gorash

Dempster

Nicholls

et al. 2016

Journal of Loss Prevention in the Process Industries

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This version is available at https://strathprints.strath.ac.uk/56219/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractThis paper presents a numerical study involving the deformation of contact faces in the metal-to-metal seal in a typical pressure relief valve. The valve geometry is simplified to an axisymmetric problem, which comprises a simple geometry consisting of only 3 components. A cylindrical nozzle, which has a valve seat on top, contacts with a disk, which is preloaded by a compressed linear spring. All the components are made of AISI type 316N(L) steel defined using the multilinear kinematic hardening model based on monotonic and cyclic tests at 20 • C. In-service observations show that there is a limited fluid leakage through the valve seat at operational pressures about 90% of the set pressure, which is caused by the fluid penetrating into surface asperities at the microscale. Nonlinear FEA in ANSYS using the fluid pressure penetration (FPP) technique revealed that there is a limited amount of fluid penetrating into gap, which is caused by the plastic deformation of the valve seat at the macroscale. Prediction of the fluid pressure distribution over the valve seat just before the valve lift is addressed in this study considering the FPP interaction on multiscale. This is the principal scope, since it allows adjustment of the valve spring force in order to improve the leak tightness.

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Section: Problem Statementmentioning

confidence: 99%

“…Below the detailed results of the study by Gorash et al (2015) are presented focusing on the development of computational analysis methods for the design of static metal-to-metal seals 25 that address different scales. The investigation is limited to * Corresponding author.…”

Section: Problem Statementmentioning

confidence: 99%

Study of mechanical aspects of leak tightness in a pressure relief valve using advanced FE-analysis

Gorash

Dempster

Nicholls

et al. 2016

Journal of Loss Prevention in the Process Industries

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“…Due to their inexpensiveness and suitable mechanical properties, rubber materials are commonly used for this purpose. However, metal-to-metal seals must be used whenever extreme thermal or pressure conditions are to be faced [1,2], as is the case in casing connections in oil wells [3][4][5][6][7][8] and pressure relieve valves [9,10]. Other fields in which metal-to-metal seals can be found include space recovery [11], aviation [12], nuclear power plants [2] or refrigeration systems for cryomagnets [13].…”

Section: Introductionmentioning

confidence: 99%

An Enhanced Stochastic Two-Scale Model for Metal-to-Metal Seals

Pérez-Ràfols

Almqvist

2018

Lubricants

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Leakage in static metal-to-metal seals is predominantly determined by the topography of the contacting surfaces. The topography consists of features that span the entire range from its carefully engineered geometry down to micro-sized surface asperities. The mesh density necessary to fully resolve all the features, in this large span of length scales, generates too many degrees of freedom for a direct numerical approach to be applicable. Some kind of sophistication, either incorporated in the mathematical model or in the numerical solution procedure or even a combination of both is therefore required. For instance, in a two-scale model, the geometrical features can be addressed in the global-scale model, while the features belonging to length scales smaller than a given cut-off value are addressed in the local-scale model. However, the classical two-scale approaches do not explicitly address the stochastic nature of the surfaces, and this has turned out to be a requirement in order to obtain quantitative predictions of leakage in metal-to-metal seals. In this work, we present a continued development of an already existing two-scale model, which incorporates a stochastic element. The novelty lies in the way we characterise the permeability at the local scale and how this is used to build a more efficient and useful approach.

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“…The channel (or gap) can be attributed to an average spacing between the seat and disc contacting surfaces with respect to surface roughness, waviness and/or form i.e. the finish quality of the metal-to-metal contacting surfaces [4].…”

Section: Introductionmentioning

confidence: 99%

Microflow Leakage Through the Clearance of a Metal-Metal Seal

Anwar

Ritos

Gorash

et al. 2016

Volume 7: Operations, Applications and Components

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The motivation behind this study is to simulate high pressure gas flow through the clearance between a valve seat and disc when in a closed position using a representative model. This leakage phenomenon is common in metal-to-metal seal pressure relief valves. As a pressure relief valve reaches the set pressure, it is known for the leakage to increase. The representative model that we studied is of an ideal-gas flow through a 2D microchannel in the slip flow regime. We used a laminar continuum flow solver which solved the mass, momentum and energy equations. In addition, we applied low pressure slip boundary conditions at the wall boundaries which considered Maxwells model for slip. The channel height was varied from 1µm to 5µm while the length remained at 1.25 mm, this means the length to height ratio varied from 1250 to 250. Inlet pressure was varied from a low pressure (0.05 MPa) to a high pressure (18.6 MPa), while the outlet remained constant at atmospheric. The calculated mass flow rate is compared to an analytical solution giving very good agreement for low pressure ratios and high length to height ratios.

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Literature Research in Relevant Fields to Understand Pressure Relief Valve Leak Tightness in a Static Closed State

Cited by 6 publications

References 17 publications

Study of mechanical aspects of leak tightness in a pressure relief valve using advanced FE-analysis

Study of mechanical aspects of leak tightness in a pressure relief valve using advanced FE-analysis

An Enhanced Stochastic Two-Scale Model for Metal-to-Metal Seals

Microflow Leakage Through the Clearance of a Metal-Metal Seal

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