Evaluation of mechanical face seals operating with hydrocarbon mixtures

Peng, Xudong; Xie, Yanchun; Gu, Yunqing

doi:10.1016/s0301-679x(02)00172-x

Cited by 10 publications

(8 citation statements)

References 5 publications

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“…Therefore, taking the mean face temperature T f as the interface temperature has been shown to be reasonable to meet the practical needs of engineering [5,6]. In this study, the following equation for T f is proposed according to Cleaver [5] and Peng et al [3]…”

Section: Face Temperaturementioning

confidence: 99%

“…the seal rings, l i the thermal conductivity of each rod, L i the length of the rod, and A i the area of the rod. The heat dissipation coefficient m di is concerned with the heat transfer effect between the sealed fluid and the seal rings and is given in detail in references [1] and [3]. For a general plane-face mechanical seal, the frictional heat between the two faces due to the mixed lubrication is given as follows [7,8] where m is the friction coefficient, p sp the spring pressure at the face, B the balance ratio, K m the film pressure coefficient, p s the absolute pressure of the sealed liquid, p s ¼ p 2 2 p 1 , v the average speed of the seal face.…”

Section: Face Temperaturementioning

confidence: 99%

“…Therefore, research on seal face temperature and seal phase states and phase state stability is very important in practice. The authors have presented a film pressure coefficient as a criterion for identifying phase states and phase state stability in references [1] to [3]. In this article, correlations for calculating thermophysical properties of single volatile process media are presented, mainly including fluid density, vapour pressure, fluid viscosity, and so on.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simpler method for volatile medium pump mechanical seals

Peng

Xie

2006

Proceedings of the Institution of Mechanical Engineers, Part J:

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Mechanical face seals operating with volatile media, such as liquid ammonia, hot water, and light hydrocarbons, generally fail as a result of phase state instability of the fluid film between the two faces. Therefore, determining face temperature and identifying phase states and phase state stability of such a face seal are very important. In this article, correlations for calculating thermophysical properties of typical single volatile process media in petrochemical plants are presented. Taking a parallel face seal as the model, a simpler method is given for determining average face temperature Tf and fluid film pressure coefficient Km which can be used as criteria for identifying phase states and phase state stability of such a seal. On the basis of the criteria and the curves relating Km to Tf, a new idea is proposed for monitoring the phase states of the fluid film between the two faces. Taking the face seals of liquid ammonia and hot water pumps as examples, the calculation results of average face temperature are in excellent agreement with the test results on-site.

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Section: Face Temperaturementioning

confidence: 99%

Section: Face Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simpler method for volatile medium pump mechanical seals

Peng

Xie

2006

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…An auxiliary seal, for example an O-ring seal, is used to prevent the leakage of the medium. Mechanical face seals are found in many devices with rotating parts, such as pumps, blowers, mixers, and other specific equipment [1][2][3]. In this study, a mechanical face seal of an automotive cooling water pump is investigated, with a particular focus on friction instabilities [4,5].…”

Section: Introductionmentioning

confidence: 99%

A Wear Simulation Method for Mechanical Face Seals under Friction Instability Conditions

Wang

Zhang

et al. 2020

Applied Sciences

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Mechanical face seals are crucial components of automotive cooling water pumps and affect the safe operation of the pump. This article focuses on the effect of friction instabilities on the wear of the seals. Friction instabilities, such as stick-slip, occur when the axle is decelerated or operated at a low speed. Based on previous studies, a simulation model is proposed of a mechanical face seal that considers the interaction of asperities of non-Gaussian surfaces and the heat transfer between the sealing rings. According to the Archard wear equation, a numerical wear simulation is performed, and the wear distance rate and wear time rate are obtained. A comparison of the contact pressure of the Gaussian and non-Gaussian surfaces indicates that the latter is more likely to generate high contact pressure, thereby producing more significant wear. The viscous shear heat and frictional heat due to asperity contact decrease with an increase in the thickness of the tapered film. As the shaft decelerates, the wear distance rate increases with an increase in the axial stiffness. The axial damping only affects the duration of the oscillations. The wear time rate decreases with an increase in the torsional stiffness and torsional damping. The results of this research provide guidelines for estimating the wear of mechanical seals when friction instabilities occur.

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“…Lebeck et al comprehensively described the seal mechanism and heat transfer regimes of mechanical face seals. Peng et al, Takami et al, and Migout et al theoretically analyzed the seal performance and the effect factors, whereas Zhang et al and Blasiak and Kundera used numerical methods to investigate the thermal characteristics of the face sealing ring and the dynamic properties of the seal structure. Besides, a lot of researching works have been conducted on the lubricating characteristics of mechanical face seals .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on sealing behaviors of an extremely high‐speed two‐stage impellers structure in cryogenic rockets

Xie

et al. 2018

Asia-Pacific J Chem Eng

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Aiming at a high‐speed‐impeller mechanical seal structure that plays a significant role in the oxidant turbopump of cryogenic rocket systems, the computational fluid dynamic approach is introduced to analyze its working performance, including the phase distribution in the flow channel, the cooling effect of the frictional element, and the sealing function as well as the power consumptions of the impellers. The established periodic 3D model, which could simultaneously account for the turbulent flow, coupled heat transfer, cavitation, and evaporation, as well as the change of thermophysical properties, was successfully verified by the experimental data. The results show that the sealing ability of a totally liquid‐filled impeller would increase with increasing rotational speed, blade size, and density of the working fluid. After the rotational speed increasing over a certain value (14,000 r/min in this case), a dynamically steady gas–liquid interface would be maintained at the Impeller II's blades, which indicates the completely effective sealing of liquid. Meanwhile, the friction surface could be effectively cooled by this two‐stage leakage cooling scheme, and its maximum temperature could be stably controlled at the rated speed. Based on the good sealing performance and effective cooling, this high‐speed‐impeller seal structure was proved to be feasible and available for cryogenic rocket systems.

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Evaluation of mechanical face seals operating with hydrocarbon mixtures

Cited by 10 publications

References 5 publications

Simpler method for volatile medium pump mechanical seals

Simpler method for volatile medium pump mechanical seals

A Wear Simulation Method for Mechanical Face Seals under Friction Instability Conditions

Numerical investigation on sealing behaviors of an extremely high‐speed two‐stage impellers structure in cryogenic rockets

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