Hoerbiger Ventilwerke GmbH and Co Kg

Vienna, Austria

Hoerbiger Ventilwerke GmbH and Co Kg

Vienna, Austria

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MacHu G.,Hoerbiger Ventilwerke GmbH and Co Kg | MacHu G.,Hoerbiger UK Ltd
Sealing Technology | Year: 2011

This feature provides details of a new high-performance packing ring design that is characterised by both its high sealing efficiency and low wear rate. As this article shows, clarifying the thermo-physical processes in a pressure packing, gaining an understanding of the wear pattern of a packing ring and elucidating the factors governing the sealing efficiency of a packing ring have played key roles in the development of this design. © 2011 Elsevier Ltd.


Friedlaender O.,Rohöl Aufsuchungs | Mussig S.,Rohöl Aufsuchungs | Dolovai P.,Hoerbiger Ventilwerke GmbH and Co Kg
Oil Gas European Magazine | Year: 2014

RAG Rohöl-Aufsuchungs Aktiengesellschaft is Austria's oldest oil and gas exploration and production company. RAG operates besides the typical oils and gas production facilities a number of underground storages for natural gas, including the Haidach storage with a capacity of 2.6 billion m3 working gas near Salzburg. The gas flows of Haidach vary greatly over timescales of hours, weeks and months in both directions during injection and production of the gas. During cold winter periods the gas peak demand can exceed 1 million m3/h. Correspondingly very high volumes of gas need to be compressed and delivered to the market. The reliable delivery of the gas demand creates a technical challenge for the operating flexibility of the compressors. The Haidach compression site consists of four reciprocating compressors fitted with reverse flow step-less capacity control. With the existing compressor valves this allows an operating range of 20-100% of nominal flow rate, and gives corresponding energy savings. New high-performance compressor valves have extended the lower flow rate limit down to 10%, thus increasing the flexibility of the capacity control system. This article describes the successful application of an innovative fully electric capacity control system. Compared to the traditional hydraulic system it offers identical operational performance, but with much simpler installation and easier maintenance, and thus better economics for small compressors. The state-of-the-art condition monitoring system used in Haidach is designed specifically for reciprocating compressors. It allows alignment of maintenance schedules concurrently with periods of low compressor demand, as well as quick and reliable shutdown possibilities in the event of an unexpected compressor malfunction. © 2014 URBAN-VERLAG Hamburg/Wien GmbH.


Janko M.,University of Leoben | Spiegl B.,Hoerbiger Ventilwerke GmbH and Co Kg | Kaufmann A.,Hoerbiger Ventilwerke GmbH and Co Kg | Lucyshyn T.,University of Leoben | Holzer C.,University of Leoben
Journal of Applied Polymer Science | Year: 2015

Short fiber reinforced (SFR) thermoplastics are ideal materials from which to manufacture complex technical parts in high volumes with low energy expenditure. The orientation of the fibers, and hence their reinforcing effect, depends strongly on the nature of the cavity and on the injection molding process. One disadvantage of SFR thermoplastics is a significant decrease in mechanical properties in the areas of the weld lines, due to suboptimal fiber orientation as the melt streams reunite at these points. Common mold-based and process-based optimization techniques alter the fiber orientation after the formation of the weld line. The mold-based approach presented here, on the other hand, operates at the time the weld line is formed: by redirecting the melt streams, it moves the weld line and improves the fiber orientation. A prototype mold is described, and samples produced from it with both standard and modified weld lines are compared with flawless specimens. The new technique yields a large rise in flexural strength and a smaller but significant improvement in tensile properties. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42025. © 2015 Wiley Periodicals, Inc.


Kluwick A.,Vienna University of Technology | Kornfeld M.,Hoerbiger Ventilwerke GmbH and Co Kg
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences | Year: 2014

In this work, laminar transonic weakly three-dimensional flows at high Reynolds numbers in slender channels, as found in microsupersonic nozzles and turbomachines of micro-electromechanical systems, are considered. The channel height is taken so small that the viscous wall layers forming at the channel walls start to interact strongly rather than weakly with the inviscid core flow and, therefore, the classical boundary layer approach fails. The resulting viscous-inviscid interaction problem is formulated using matched asymptotic expansions and found to be governed by a triple-deck structure. As a consequence, the properties of the predominantly inviscid core region and the viscous wall layers have to be calculated simultaneously in the interaction region. Weakly three-dimensional effects caused by surface roughness, upstream propagating flow perturbations, boundary layer separation as well as bifurcating solutions are discussed. Representative results for subsonic as well as supersonic conditions are presented, and the importance of these flow phenomena in technical applications as, for example, a means to reduce shock losses through the use of deformed geometry is addressed. © 2014 The Author(s) Published by the Royal Society. All rights reserved.


PubMed | Hoerbiger Ventilwerke GmbH and Co Kg and Vienna University of Technology
Type: Journal Article | Journal: Philosophical transactions. Series A, Mathematical, physical, and engineering sciences | Year: 2014

In this work, laminar transonic weakly three-dimensional flows at high Reynolds numbers in slender channels, as found in microsupersonic nozzles and turbomachines of micro-electro-mechanical systems, are considered. The channel height is taken so small that the viscous wall layers forming at the channel walls start to interact strongly rather than weakly with the inviscid core flow and, therefore, the classical boundary layer approach fails. The resulting viscous-inviscid interaction problem is formulated using matched asymptotic expansions and found to be governed by a triple-deck structure. As a consequence, the properties of the predominantly inviscid core region and the viscous wall layers have to be calculated simultaneously in the interaction region. Weakly three-dimensional effects caused by surface roughness, upstream propagating flow perturbations, boundary layer separation as well as bifurcating solutions are discussed. Representative results for subsonic as well as supersonic conditions are presented, and the importance of these flow phenomena in technical applications as, for example, a means to reduce shock losses through the use of deformed geometry is addressed.

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