Identification of the Intermittent Synchronous Instability in a High Performance Steam Turbine Rotor Due to Deteriorated Labyrinth Seals PUBLIC ACCESS

[+] Author Affiliations
Inam U. Haq, Rayed M. Al-Zaid

SABIC Research & Development, Jubail, Saudi Arabia

Chittineni V. Kumar

Al-Jubail Fertilizer Company (SAMAD), Jubail, Saudi Arabia

Paper No. 98-GT-305, pp. V005T14A019; 12 pages
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7866-8
  • Copyright © 1998 by ASME


This paper reports the synchronous vibration instability problem (a rare phenomenon) experienced in a high pressure steam turbine rotor (19MW) driving synthesis gas compressor train in a large scale petrochemical complex. The turbine had about one year history of showing infrequently high vibration. Rotor vibrations appeared in an intermittent and irregular fashion and the perturbation frequency was the rotor operating speed of 10,135 rpm. The sealing steam system was found responsible for cropping the vibration. At a definite level of seal steam pressure (0.90 to 1.10 bar-gauge), operating speed and load, the rotor radial vibration response was reached at 4.5 mils as compared to the frequently smooth running level of less than 1.0 mil. Subsequently, the major overhauling of the turbine revealed severely worn and, virtually, non-functional high pressure end labyrinth seals. The paper also elaborates the steam turbine rotordynamics behaviors recorded during excessive levels of vibration.

Copyright © 1998 by ASME
This article is only available in the PDF format.



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