A last stage turbine blades failure was experienced in two units of 660 MW. These units have one high-pressure turbine and two tandem-compound low-pressure turbines with 44-inch last-stage blades. The blades that failed were in a low pressure (LP) turbine connected to the high pressure (HP) turbine (LP1) and in LP turbine connected to the generator (LP2). The failed blades had cracks in their roots initiating at the trailing edge, concave side of the steeple outermost fillet radius. Laboratory evaluation of the cracking indicates the failure mechanism to be high cycle fatigue (HCF). The last-stage blades failure evaluation was carried out. The investigation included a metallographic analysis of the cracked blades, natural frequency test and analysis, blade stress analysis, unit’s operation parameters and history of events analysis, fracture mechanics and crack propagation analysis. This paper provides an overview of this failure investigation, which led to the identification of the blades torsional vibrations near 120 Hz and some operation periods with low load low vacuum as the primary contribution to the observed failure.
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ASME 2007 Power Conference
July 17–19, 2007
San Antonio, Texas, USA
Conference Sponsors:
- Power Division
ISBN:
0-7918-4273-8
PROCEEDINGS PAPER
Last-Stage Blade Failure Evaluation Available to Purchase
Zdzislaw Mazur,
Zdzislaw Mazur
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Mor., Me´xico
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Rafael Garci´a-Illescas,
Rafael Garci´a-Illescas
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Mor., Me´xico
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Jorge Aguirre-Romano,
Jorge Aguirre-Romano
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Mor., Me´xico
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Norberto Pe´rez-Rodri´guez
Norberto Pe´rez-Rodri´guez
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Mor., Me´xico
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Zdzislaw Mazur
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Mor., Me´xico
Rafael Garci´a-Illescas
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Mor., Me´xico
Jorge Aguirre-Romano
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Mor., Me´xico
Norberto Pe´rez-Rodri´guez
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Mor., Me´xico
Paper No:
POWER2007-22010, pp. 83-90; 8 pages
Published Online:
April 21, 2009
Citation
Mazur, Z, Garci´a-Illescas, R, Aguirre-Romano, J, & Pe´rez-Rodri´guez, N. "Last-Stage Blade Failure Evaluation." Proceedings of the ASME 2007 Power Conference. ASME 2007 Power Conference. San Antonio, Texas, USA. July 17–19, 2007. pp. 83-90. ASME. https://doi.org/10.1115/POWER2007-22010
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