The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform
Huebner Michael - One of the best experts on this subject based on the ideXlab platform.
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Barrier And Buffer Fluid Selection And Considerations For Mechanical Seals
'Biophysical Society of Japan', 2016Co-Authors: Huebner MichaelAbstract:TutorialThe increased use of pressurized and non-pressurized Dual mechanical Seals has driven more installations to require the use of barrier and buffer fluids. While some end users have viewed the selection of barrier fluids as an afterthought, their selection is a critical aspect of the Seal operation and reliability. A thorough application review requires an understanding of the mechanical Seal, Sealing system, pump, and process. Fortunately there is a large installed base of successful installations to guide barrier and buffer fluid selections. Through the careful selection of fluids and good operating practices, barrier and buffer fluids can help provide reliable Dual Seal operation
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Barrier And Buffer Fluids Selection And Considerations For Mechanical Seals
Turbomachinery Laboratories Texas A&M Engineering Experiment Station, 2015Co-Authors: Huebner MichaelAbstract:TutorialThe increased use of pressurized and non-pressurized Dual mechanical Seals has driven more installations to require the use of barrier and buffer fluids. While some end users have viewed the selection of barrier fluids as an afterthought, their selection is a critical aspect of the Seal operation and reliability. A thorough application review requires an understanding of the mechanical Seal, Sealing system, pump, and process. Fortunately there is a large installed base of successful installations to guide barrier and buffer fluid selections. Through the careful selection of fluids and good operating practices, barrier and buffer fluids can help provide reliable Dual Seal operation
E. A. Selim - One of the best experts on this subject based on the ideXlab platform.
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Integral Pumping Devices for Dual Mechanical Seals: Experiments and Numerical Simulations experimental and numerical investigation is carried out to evaluate the performance
2015Co-Authors: H.a. Warda, E. M. Wahba, E. A. SelimAbstract:An experimental and numerical investigation is carried out to evaluate the performanceof alternative pumping ring designs for Dual mechanical Seals. Both radial-flow andaxial-flow pumping rings are considered in the present study. An experimental setup isconstructed, and appropriate instrumentation are employed to measure the pressure, tem-perature, and flow rate of the barrier fluid. A parametric study is carried out to investi-gate the effect of pump rotational speed, barrier fluid accumulator pressure, and barrierfluid inlet temperature on the performance of the pumping rings. Experiments are alsoused to evaluate the effect of different geometric parameters such as the radial clearancebetween the pumping ring and the surrounding gland, and the outlet port orientation.Moreover, a numerical study is conducted to simulate the flow field for the radial pump-ing ring designs under different operating parameters. The computational fluid dynamics(CFD) model implements a multiple reference frame (MRF) technique, while turbulenceis modeled using the standard k-epsilon model. Numerical simulations are also used tovisualize the flow of the barrier fluid within the Dual Seal cavity. Present results indicatethat the pump rotational speed and the orientation of the outlet port have a significanteffect on the performance of the pumping ring. On the other hand, the effects of barrierfluid accumulator pressure and inlet temperature are minimal on the performance. Thestudy also shows that reducing the radial clearance between the rotating ring and the sta-tionary outer gland would significantly improve the performance of axial pumping rings.Moreover, comparisons between the computational and experimental results show goodagreement for pumping ring configurations with tangential outlet (TO) ports and atmoderate rotational speeds. [DOI: 10.1115/1.4028384]Keywords: Dual mechanical Seal, integral pumping device, radial pumping ring, axialpumping ring, computational fluid dynamics
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Integral Pumping Devices for Dual Mechanical Seals: Experiments and Numerical Simulations
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2014Co-Authors: H.a. Warda, E. M. Wahba, E. A. SelimAbstract:An experimental and numerical investigation is carried out to evaluate the performance of alternative pumping ring designs for Dual mechanical Seals. Both radial-flow and axial-flow pumping rings are considered in the present study. An experimental setup is constructed, and appropriate instrumentation are employed to measure the pressure, temperature, and flow rate of the barrier fluid. A parametric study is carried out to investigate the effect of pump rotational speed, barrier fluid accumulator pressure, and barrier fluid inlet temperature on the performance of the pumping rings. Experiments are also used to evaluate the effect of different geometric parameters such as the radial clearance between the pumping ring and the surrounding gland, and the outlet port orientation. Moreover, a numerical study is conducted to simulate the flow field for the radial pumping ring designs under different operating parameters. The computational fluid dynamics (CFD) model implements a multiple reference frame (MRF) technique, while turbulence is modeled using the standard k-epsilon model. Numerical simulations are also used to visualize the flow of the barrier fluid within the Dual Seal cavity. Present results indicate that the pump rotational speed and the orientation of the outlet port have a significant effect on the performance of the pumping ring. On the other hand, the effects of barrier fluid accumulator pressure and inlet temperature are minimal on the performance. The study also shows that reducing the radial clearance between the rotating ring and the stationary outer gland would significantly improve the performance of axial pumping rings. Moreover, comparisons between the computational and experimental results show good agreement for pumping ring configurations with tangential outlet (TO) ports and at moderate rotational speeds.
H.a. Warda - One of the best experts on this subject based on the ideXlab platform.
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Integral Pumping Devices for Dual Mechanical Seals: Experiments and Numerical Simulations experimental and numerical investigation is carried out to evaluate the performance
2015Co-Authors: H.a. Warda, E. M. Wahba, E. A. SelimAbstract:An experimental and numerical investigation is carried out to evaluate the performanceof alternative pumping ring designs for Dual mechanical Seals. Both radial-flow andaxial-flow pumping rings are considered in the present study. An experimental setup isconstructed, and appropriate instrumentation are employed to measure the pressure, tem-perature, and flow rate of the barrier fluid. A parametric study is carried out to investi-gate the effect of pump rotational speed, barrier fluid accumulator pressure, and barrierfluid inlet temperature on the performance of the pumping rings. Experiments are alsoused to evaluate the effect of different geometric parameters such as the radial clearancebetween the pumping ring and the surrounding gland, and the outlet port orientation.Moreover, a numerical study is conducted to simulate the flow field for the radial pump-ing ring designs under different operating parameters. The computational fluid dynamics(CFD) model implements a multiple reference frame (MRF) technique, while turbulenceis modeled using the standard k-epsilon model. Numerical simulations are also used tovisualize the flow of the barrier fluid within the Dual Seal cavity. Present results indicatethat the pump rotational speed and the orientation of the outlet port have a significanteffect on the performance of the pumping ring. On the other hand, the effects of barrierfluid accumulator pressure and inlet temperature are minimal on the performance. Thestudy also shows that reducing the radial clearance between the rotating ring and the sta-tionary outer gland would significantly improve the performance of axial pumping rings.Moreover, comparisons between the computational and experimental results show goodagreement for pumping ring configurations with tangential outlet (TO) ports and atmoderate rotational speeds. [DOI: 10.1115/1.4028384]Keywords: Dual mechanical Seal, integral pumping device, radial pumping ring, axialpumping ring, computational fluid dynamics
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Integral Pumping Devices for Dual Mechanical Seals: Experiments and Numerical Simulations
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2014Co-Authors: H.a. Warda, E. M. Wahba, E. A. SelimAbstract:An experimental and numerical investigation is carried out to evaluate the performance of alternative pumping ring designs for Dual mechanical Seals. Both radial-flow and axial-flow pumping rings are considered in the present study. An experimental setup is constructed, and appropriate instrumentation are employed to measure the pressure, temperature, and flow rate of the barrier fluid. A parametric study is carried out to investigate the effect of pump rotational speed, barrier fluid accumulator pressure, and barrier fluid inlet temperature on the performance of the pumping rings. Experiments are also used to evaluate the effect of different geometric parameters such as the radial clearance between the pumping ring and the surrounding gland, and the outlet port orientation. Moreover, a numerical study is conducted to simulate the flow field for the radial pumping ring designs under different operating parameters. The computational fluid dynamics (CFD) model implements a multiple reference frame (MRF) technique, while turbulence is modeled using the standard k-epsilon model. Numerical simulations are also used to visualize the flow of the barrier fluid within the Dual Seal cavity. Present results indicate that the pump rotational speed and the orientation of the outlet port have a significant effect on the performance of the pumping ring. On the other hand, the effects of barrier fluid accumulator pressure and inlet temperature are minimal on the performance. The study also shows that reducing the radial clearance between the rotating ring and the stationary outer gland would significantly improve the performance of axial pumping rings. Moreover, comparisons between the computational and experimental results show good agreement for pumping ring configurations with tangential outlet (TO) ports and at moderate rotational speeds.
Andreas T. Wolf - One of the best experts on this subject based on the ideXlab platform.
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Silicone Sealed Insulating Glass Units
2003Co-Authors: Andreas T. WolfAbstract:Summary Silicone Dual-Seal insulating glass units (IGUs) have a lower moisture penetration rate than organically Sealed units, because the permeability of the edge-Seal is almost exclusively determined by the permeability of the primary (PIB) Seal, and because silicone secondary Sealants do a better job in maintaining a low effective cross-section relevant for diffusion through the primary Seal. Silicone Dual-Seal IGU achieve a higher life expectancy under actual service conditions, because the physical properties and adhesion of silicone secondary Sealants are very little affected by the key environmental ageing factor, i.e. ultraviolet light, heat and humidity. The paper discusses the functions and properties of the IGU edge-Seal, the stresses on the IGU edge-Seal, key criteria for performance assessment of IGUs, the properties of silicone Dual-Sealed IGUs, and provides a comparison of the properties of silicone and organic secondary IG Sealants.
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Studies into the life-expectancy of insulating glass units
Building and Environment, 1992Co-Authors: Andreas T. WolfAbstract:Abstract Insulating glass units are exposed to a variety of environmental factors, such as temperature and atmospheric pressure fluctuations, wind loads, working loads, sunlight, water and water vapour. The service life of a Sealed insulating glass unit critically depends on the perfect functioning of the edge Seal under these environmental influences. The water vapour permeability of the secondary insulating glass Sealant plays only a subordinate role in the life expectancy of a Dual-Seal insulating glass unit, since the resistance of the edge Seal to water vapour diffusion is determined almost exclusively by the low water vapour permeability of the PIB primary Seal. On the other hand, great importance must be attached to the viscoelastic properties of the secondary insulating glass Sealants, particularly to their tensile stress behaviour and their elastic recovery, as these properties affect the ability of the primary Seal to function. In the case of gas-filled insulating glass units, the gas permeability of the secondary Seal exerts a great influence on the gas leakage rate, since the gas permeabilities of organic primary and secondary Sealants are approximately equal. When silicone Sealants are used for the production of gas-filled insulating glass units, additional measures must be taken to ensure a gas-tight edge Seal.
Richard Smith - One of the best experts on this subject based on the ideXlab platform.
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contradicting requirements in api 682 Dual Seal design configurations
2008Co-Authors: Richard SmithAbstract:Mechanical Seal designers face opposing challenges when developing Dual Seal s. The requirement to provide optimised Seal face cooling conflicts with the need to provide a Seal that is tolerant of pressure reversal and abrasive or congealing fluids. Poor Seal face cooling can potentially reduce reliability. The American Petroleum Institute mechanical Seal standard (API682 ISO 21049) offers users a choice of three different configurations. Advantages and disadvantages are discussed of each type. Elegant designs are now available that can satisfy these opposing requirements. The use of CFD and testing has optimised these solutions. Field studies provide verification for these design concepts.
