Verification of two methods to mitigate high frequency pipe shell vibration
- Nova Gas Transmission Limited, Calgary, Alberta (Canada)
High frequency vibration generated by centrifugal compressors can cause fatigue damage to attached compressor piping systems. In some cases, components of piping systems exposed to such vibrations experience fatigue failures only after a few hours of operation. This paper describes several approaches to mitigate compressor generated high frequency vibrations. It focuses on two passive methods which have been implemented at NOVA Gas Transmission Limited (NGTL). The first method describes how to disturb and disorganize a high frequency complex acoustical field which propagates through the compressor discharge piping thus reducing the excitation forces. The second method involves a direct piping modification which influences the piping mechanical responses. Both methods are applied to large diameter (NPS 24 and NPS 36) natural gas piping systems incorporating 16 MW and 25 MW centrifugal compressors. Vibration velocities are documented for As found systems and for systems modified by implementation of each method. Dynamic stress levels for As found systems are reported in the form of K factors. Discussion of the results is followed by brief guidelines which show how to improve the structural integrity of piping subjected to high frequency vibrations.
- OSTI ID:
- 403410
- Report Number(s):
- CONF-960706--; ISBN 0-7918-1775-X
- Country of Publication:
- United States
- Language:
- English
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