High-frequency pulsation generated by centrifugal compressors, with pressure wavelengths much smaller than the attached pipe diameter, can cause fatigue failures of the compressor internals, impair compressor performance, and damage the attached compressor piping. There are numerous sources producing pulsation in centrifugal compressors. Some of them are discussed in literature at large (Japikse, 1995; Niese, 1976). NGTL has experienced extreme high-frequency discharge pulsation and pipe wall vibration on many of its radial inlet high-flow centrifugal gas compressor facilities. These pulsations led to several piping attachment failures and compressor internal component failures while the compressor operated within the design envelope. This paper considers severe pulsation conditions at an NGTL compression facility which resulted in unacceptable piping vibration. Significant vibration attenuation was achieved by modifying the compressor (pulsation source) through removal of the diffuser vanes and partial removal of the inlet guide vanes (IGV). Direct comparison of the changes in vibration, pulsation, and performance are made for each of the modifications. The vibration problem, probable causes, options available to address the problem, and the results of implementation are reviewed. The effects of diffuser vane removal on discharge pipe wall vibration as well as changes in compressor performance are described.

Issue Section:
Research Papers
Topics:
Compressors, Pipes, Vibration, Diffusers, Failure, Inlet guide vanes, Compression, Damage, Design, Fatigue failure, Flow (Dynamics), Gas compressors, Pressure, Wavelength
1.
Japikse, D., and Baines, N. C., 1995, “Introduction to Turbomachinery,” Concepts ETI, Inc. and Oxford University Press, Vermont-New York.
2.
Marcher, W., and D’Orsi, N., 1996, Technical Memorandum No. 484 “Aero/Pulsation/Vibration Testing of a Compressor at Vetchland Booster Pipeline Station,” CONCEPTS ETI, Vermont.
3.
Motriuk, R. W., 1994, “High Frequency Vibration Analysis,” NGTL internal report.
4.
Motriuk, R. W., 1994, “Preliminary Study on Pipe Shell Vibration: Vibration Velocity-Stress Relationship Based on Field Measurements,” Fifth International Conference on Recent Advances in Structural Dynamics, Proceedings of Work in Progress Papers, Vol. 1, University of Southampton, England, pp. 49–55.
5.
Motriuk, R. W., 1994, “Field Measurements of Piping Vibration—The Relationship of Vibration Velocity with Dynamic Strain and Stress,” Proceedings, Second International Conference on Motion and Vibration Control, Yokohama, Japan, Vol. 2, pp. 783–786.
6.
Motriuk, R. W., 1996, “Verification of Two Methods to Mitigate High Frequency Pipe Shell Vibration,” Conference, Montreal, Canada, ASME PVP-Vol, Flow-Induced Vibration, pp. 405–413.
7.
Neise
W.
,
1976
, “
Noise Reduction in Centrifugal Fans: A Literature Survey
,”
Journal of Sound and Vibration
, Vol.
45
, No.
3
, pp.
375
–
403
.
8.
Petela, G., and Motriuk, R. W., 1996, “Attenuation of Blade Passing Excitation In Centrifugal Compressor,” Proceedings, InterNoise Conference, July 30–August 2, Liverpool UK, Vol. 2, pp. 1015–1020.
9.
Zhou
J.
, and
Motriuk
R. W.
, “
Influence of Tapered Thermowell Length on Temperature Measurement
,”
ASME PVP
-Vol.
333
, pp.
97
–
104
.
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