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Implementation of Load Reducing Bushings for Valves in a High Vibration Environment

[+] Author Affiliations
Alton Reich, Steve Doherty

Streamline Automation, LLC, Huntsville, AL

Keith Williams

University of Alabama, Tuscaloosa, AL

Paper No. PVP2008-61151, pp. 317-321; 5 pages
doi:10.1115/PVP2008-61151
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 7: Operations, Applications and Components
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4830-2 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME

abstract

The Arnold Engineering Development Center (AEDC) testing complex includes more than 50 wind tunnels, test cells, arc heaters, and other specialized test facilities. Of these, 27 units have capabilities that are unmatched in the United States, and 14 are unmatched in the world. These unique facilities create equally unique operating environments for instrumentation used for monitoring and control of test conditions. Several high flow-rate, supersonic wind tunnels utilize off-the-shelf angular displacement transducers (ADTs) for monitoring the position of 90° valves (i.e. butterfly valves) used to control the air flow-rate, operating pressure, and temperature during testing. There are significant structural vibrations in the wind tunnels to which the ADTs are subjected. These ADTs have experienced an unacceptably high rate of failure during testing. These failures increase maintenance costs, and in some cases can require test operations be suspended while the faulty ADT is replaced; leading to significant cost and schedule impacts associated with the down-time. This paper discusses the final phase of a multi-year effort to develop and field a vibration reducing bushing assembly for use on quarter turn valves used for flow control on wind tunnels at Arnold Enginnering Development Center. The focus of the final phase was on adapting the solution that was tested in the laboratory and field to fit the various valve geometries and conditions found in the installations. Design challenges and solutions are discussed.

Copyright © 2008 by ASME

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