0

Full Content is available to subscribers

Subscribe/Learn More  >

Selection of Vibro-Characteristics for Monitoring Flange Integrity in the Field Conditions

[+] Author Affiliations
Vladimir Palmov

St. Petersburg Polytechnic University, St. Petersburg, Russia

Len Malinin

Gen3 Partners, Boston, MA

Paper No. IMECE2016-65024, pp. V009T17A011; 6 pages
doi:10.1115/IMECE2016-65024
From:
  • ASME 2016 International Mechanical Engineering Congress and Exposition
  • Volume 9: Mechanics of Solids, Structures and Fluids; NDE, Diagnosis, and Prognosis
  • Phoenix, Arizona, USA, November 11–17, 2016
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5063-3
  • Copyright © 2016 by ASME

abstract

Monitoring of flange integrity in the field traditionally has been based on evaluating bolt tension and deriving pressure on the gasket from these data. Multiple techniques of evaluating bolt tension based on measuring speed of propagation of a longitudinal wave (time of flight), or ratio of speeds of longitudinal and shear waves (“L+S method”), demonstrate 5–10% accuracy in the controlled laboratory conditions [1]. However, accuracy in the field, on the flanges exposed to harsh environment, is often worse than 20%, which makes it difficult to evaluate flange integrity and predict a leak. The need for knowing acousto-elastic parameters of steel (in case of L+S method) may also present a hurdle.

Tools based on measuring a shift of the resonance frequencies (RF) are commercially available, though RF are relatively robust to tension, and require a reliable data processing procedure to discern the proper peaks. Evaluation of tension based on natural modes is more sensitive, but relatively complex and costly. Use of transfer functions (TF) offers several advantages over both RF and natural modes, as TFs depend on both RF frequencies and natural modes, and a properly selected parameter of TF can offer greater sensitivity.

Copyright © 2016 by ASME
Topics: Flanges

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In