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Carmody C.,Aesseal Plc | Kaminske T.,Dresser Rand Company
Sealing Technology | Year: 2015

This article provides an insight into the selection of sealing devices to encourage a more detailed evaluation when choosing elastomers for high-pressure duties often encountered in turbomachinery. It highlights some of the most relevant issues and how test data and material properties need to be taken into account in order to identify the optimum elastomeric seal material for a given duty. © 2015 Elsevier Ltd.


Carmody C.J.,AESSEAL plc
Institution of Mechanical Engineers - 12th European Fluid Machinery Congress | Year: 2014

Mechanical seals are frequently employed to seal all manner of rotating equipment including agitators, pumps and turbo compressors. The diverse nature of the fluids being sealed, temperature and pressure extremes combined with size and rotational speed all combine to make the sealing process difficult. This paper looks at finite element modelling of a mechanical seal face and secondary sealing element interacting within the same model. Such models are often simplified by ignoring the secondary sealing elements and replacing them with constraints or load assumptions that make the modelling process easier. Similarly secondary sealing elements are rarely modelled within the actual assemblies into which they are employed. Furthermore certain characteristics such as non linear material properties and preload issues are often overlooked or approximated, again to simplify solutions. In particular the work focuses on how accurate modelling techniques are needed in the evaluating the seal interface deflections. Finally some test results were used to compare the various model predictions. These verify that the multi-physics approach predicted the leakage far more accurately than the other models investigated. © The author(s) and/or their employer(s), 2014.


Smith R.J.,AESSEAL plc
Institution of Mechanical Engineers - 12th European Fluid Machinery Congress | Year: 2014

Contamination issues are increasingly causing pumping equipment reliability concerns, as the upstream sector pushes for production in ever more marginal fields. Seal designers are frequently in a position where design requirements conflict. Increasing contamination, industry trends for high barrier fluid pressures, coupled with larger shaft diameters and high shaft speeds only serve to exacerbate these issues. The paper discusses the three different recognised dual seal configurations and some of the advantages and disadvantages. Choices and execution barrier fluid system also impact on design choice. A case study is presented where contamination caused high levels of leakage from a traditional dual seal and where alternative configuration proved more reliable. © AESSEAL plc, 2014.


Ojile J.O.,Cranfield University | Teixeira J.A.,Cranfield University | Carmody C.,AESSEAL plc
Tribology Transactions | Year: 2010

This article presents a study on failure analysis of mechanical face seals using reliability tools such as the Weibull and WeiBayes techniques. The Weibull tool is used when a reasonable number of failure data are available, whereas the WeiBayes approach is employed when the failure data are scarce or nonexistent. Results from this study have been used in determining the characteristic life and slope used in assessing warranty cost as well as for selecting the best design from a pool of different designs. Weibull and WeiBayes techniques have been applied to analyzing failures of a wide variety of machines and machines components. This study is an example of the application of the techniques to failure analysis of mechanical face seals. © Society of Tribologists and Lubrication Engineers.


Roddis A.,AESSEAL Plc
World Pumps | Year: 2010

In this article, Alan Roddis examines a typical submersible pump to determine what changes can be made to improve sealing effectiveness. He concentrates on three primary elements of seal performance; seal design, seal face materials and sealing environment, and includes a case study to illustrate these changes. © 2010 Elsevier Ltd.


Roddis A.,AESSEAL Plc
World Pumps | Year: 2010

In this article, Alan Roddis from AESSEAL explains how a hygienic seal design can protect process fluid from environmental contamination. He explores the effectiveness of cleaning regimes in the pharmaceutical and food and beverage industries and the design considerations which can prevent the contact process fluid from being contaminated. © 2010 Elsevier Ltd.


Carmody C.,Aesseal Plc | Rea C.,Aesseal Plc
Sealing Technology | Year: 2014

This article examines the statistical life expectancy of the LabTecta bearing protector - a non-contacting labyrinth bearing seal - supplied by Aesseal Plc over a seven-year period. The objective of this analysis is to statistically determine the life expectancy, hence product reliability, of this bearing protector based on field service performance data. To that effect, the co-authors used widely accepted probability techniques. © 2014 Elsevier Ltd.


Carmody C.J.,AESSEAL plc | Ojlle J.O.,AESSEAL plc
Institution of Mechanical Engineers - 11th European Fluid Machinery Congress | Year: 2010

This paper shows how purpose written software can be used in conjunction with commercially available Finite Element and CFD software to study mechanical seal operation and in particular the fluid film under a wide range of conditions. In addition to software predictions the paper also gives details of dynamic tests that were conducted to verify that the software predictions were realistic and can therefore be adopted as a design tool. The results produced by the software enabled a hydrostatic and hydrodynamic evaluation to be determined so that preliminary seal face designs as well as geometric shapes of the primary elements could be established. © AESSEAL plc, 2010.

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