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

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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.

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References

  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.

  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).

  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.

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.

  2. G.R. Gonzalez: Análisis de la Falla del alabe de La Turbina,” internal report of UAEM-CIICAP, No. 9P/DM/CIICAP, 2002.

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Authors and Affiliations

  1. Centro de Investigación en Ingeniería y Ciencias Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, C.P. 62210, Cuernavaca, Morelos, México

    J. Kubiak Sz., G. Gonzalez R., D. Juárez R., J. Nebradt G. & F. Sierra E.

  2. Comisión Federal de Electricidad, Subdirección de Generación, México D.F.

    J. Nebradt G.

Authors
  1. J. Kubiak Sz.
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  2. G. Gonzalez R.
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  3. D. Juárez R.
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  4. J. Nebradt G.
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  5. F. Sierra E.
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  6. J. Nebradt G.
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Kubiak Sz., J., Gonzalez R., G., Juárez R., D. et al. An investigation on the failure of an L-O steam turbine blade. J Fail. Anal. and Preven. 4, 47–51 (2004). https://doi.org/10.1007/s11668-996-0014-x

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  • DOI: https://doi.org/10.1007/s11668-996-0014-x

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