0
TECHNICAL PAPERS

Acoustic Fatigue of a Steam Dump Pipe System Excited by Valve Noise

[+] Author and Article Information
Suzanne Michaud

Centrale Nucleaire Gentilly, Becancour, Quebec G9X 3X3, Canada

Samir Ziada

Mechanical Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada e-mail: ziadas@mcmaster.ca

Henri Pastorel

Institut de recherche d’Hydro-Quebec, Varennes, Quebec J3X 1S1, Canada

J. Pressure Vessel Technol 123(4), 461-468 (May 23, 2001) (8 pages) doi:10.1115/1.1400741 History: Received December 07, 2000; Revised May 23, 2001
Copyright © 2001 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Layout of the steam dump piping system—1) fresh steam pipe (from steam generators); 2) isolation valves; 3) control valves; 4) 16 NPS pipes; 5) 20 NPS pipes; 6) 30 NPS pipes leading to condenser; S1 to S6: location of strain gages
Grahic Jump Location
Geometry of the original valve—the seat diameter is 255 mm and the maximum valve lift is 100 mm
Grahic Jump Location
Typical spectra of the dynamic axial strain at location S6—(a) original stem, total rms amplitude of strain=43.2 μ; and (b) modified stem, total rms amplitude=11.8 μ
Grahic Jump Location
Typical spectra of the dynamic tangential strain at location S6—(a) original stem, total rms amplitude of strain=44.5 μ; and (b) modified stem, total rms amplitude=15.7 μ
Grahic Jump Location
Comparison of average dynamic stress amplitude before (dark symbols) and after (open symbols) modifying the valve stem. Top, middle, and bottom figures for location S1, S5, and S6, respectively. ▪, □, axial stress; •, ○, tangential (hoop) stress.
Grahic Jump Location
Stress cycle distributions for the axial stress at Site S5 and 52 percent valve lift showing the effect of low and high-pass filters. The filter used had a cut-off frequency of 1 kHz.
Grahic Jump Location
Geometry of the modified stem—1) first stage of pressure reduction consists of 12 slits each 42 mm in width; 2) second stage consists of 408 orifices ranging from 11 to 17 mm in diameter
Grahic Jump Location
Typical spectra of the noise generated inside the downstream pipe by the original and the modified stems. The results are obtained from small-scale model tests by means of pressurized air. Valve lift=100 percent, pressure ratio=3.
Grahic Jump Location
Total acoustic efficiency (related to total sound power) of the original and the modified stems, given as a function of the pressure ratio. The results are obtained from small-scale model tests by means of pressurized air. Valve lift=100 percent.
Grahic Jump Location
Amplitude of vibration velocity (rms) measured on the coupling block of the valve stem and in the radial direction. ♦, original stem; ○, two-stage stem; ▵, single-stage stem.
Grahic Jump Location
Comparison of average dynamic stress amplitude on the pipe, with different stems in the valve. Location S5, axial stress. ○, original stem; □, two-stage stem; ▵, single-stage stem.

Tables

Errata

Discussions

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 Journal Articles
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