An investigation on the failure of an L-O steam turbine blade

  • J. Kubiak Sz.
  • G. Gonzalez R.
  • D. Juárez R.
  • J. Nebradt G.
  • F. Sierra E.
  • J. Nebradt G.
Peer Reviewed Articles
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Abstract

This paper presents an analysis of the cause of steam turbine blade fractures. Recently, several L-0 blades 28.5 in. (725 mm) long of a steam turbine fractured 5 in. (125 mm) from the blade root platform, causing the forced outage of the turbine. A finite-element analysis (FEA) of the blade was carried out in the beginning of the last decade to calculate the natural frequencies and the vibratory stresses on the blade. A telemetry test was also conducted. The current investigation analyzed the operational data during the last two years, reviewed the results of previous studies, conducted metallurgical investigations, and identified the mechanical and metallurgical modes of the failure. The results of the investigations showed that improper welding of the stubs was the principal cause of blade fracture.

Keywords

blade stub fracture blade vibration failure analysis fatigue 

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References

  1. 1.
    J. Kubiak, A. Carnero, et al.: “Identification of Failures of Long Turbine Blades by Telemetry and FEM Analysis” (invited paper), Advances of International Power Engineering Conference, 17–21 May (Hangzhou, China), C. Kefa and Y.S. Lou, ed., International Academic Press, 1992, pp. 781–90.Google Scholar
  2. 2.
    J. Kubiak, A. Carnero, J. Ojeda, et al.: “Analysis of Improved and Original Design of the Last Stage Blade,” American Power Conference, 1 April 1993 (Chicago, IL).Google Scholar
  3. 3.
    A. Carnero and J. Kubiak: “Calculation and Analysis of the Last Stage Blade Group,” internal report of the Instituto de Investigaciones Electricas (IIE), IIE/34/2475/I/046P, Cuernavaca, Mexico, 1991.Google Scholar

Selected References

  1. •.
    J. Kubiak: “Diagnostico de fractura de los Alabes L-0 de la Turbina,” internal report of EM-CIICAP, No. 6P/DM/CIICAP, Universidad Autonoma del Estado de; Morelos centro de Investigaciones en Ingenieria y Ciencias Aplicadas (UAEM-CIICAP), 2002.Google Scholar
  2. •.
    G.R. Gonzalez: Análisis de la Falla del alabe de La Turbina,” internal report of UAEM-CIICAP, No. 9P/DM/CIICAP, 2002.Google Scholar

Copyright information

© ASM International 2004

Authors and Affiliations

  • J. Kubiak Sz.
    • 1
  • G. Gonzalez R.
    • 1
  • D. Juárez R.
    • 1
  • J. Nebradt G.
    • 1
  • F. Sierra E.
    • 1
  • J. Nebradt G.
    • 2
  1. 1.Centro de Investigación en Ingeniería y Ciencias AplicadasUniversidad Autónoma del Estado de MorelosCuernavaca, MorelosMéxico
  2. 2.Comisión Federal de ElectricidadSubdirección de GeneraciónMéxico D.F.

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