The tie-lugs on a 46” last stage blade (LSB) operated in a power plant first commissioned in the early 1960s experienced a long service history of cracking problems. A root cause investigation was performed, which identified the third mode of the bladed disc as operating near resonance. The original configuration is a 4-blade group structure with two tie-lugs. The third mode is a group torsional mode in which maximum stress occurs in the outer lugs. Dynamic stress throughout the rotating stage was calculated using a FE model. Based on the results of the investigation features of a retrofit were identified to detune the resonant mode and change the brazed lug to a more reliable forged design. A probabilistic analysis was used to demonstrate how the risk of cracking problem would be dramatically reduced.
Skip Nav Destination
ASME 2004 Power Conference
March 30–April 1, 2004
Baltimore, Maryland, USA
Conference Sponsors:
- Power Division
ISBN:
0-7918-4162-6
PROCEEDINGS PAPER
Risk Assessment of an L-0 Stage Blade Retrofit
Tony C.-T. Lam,
Tony C.-T. Lam
Turbine/Technology International, Rochester, NY
Search for other works by this author on:
Lewis H. Shuster,
Lewis H. Shuster
Reliant Resources, Inc.
Search for other works by this author on:
Robert P. Dewey
Robert P. Dewey
Turbine/Technology International, Rochester, NY
Search for other works by this author on:
Tony C.-T. Lam
Turbine/Technology International, Rochester, NY
Lewis H. Shuster
Reliant Resources, Inc.
Robert P. Dewey
Turbine/Technology International, Rochester, NY
Paper No:
POWER2004-52058, pp. 269-277; 9 pages
Published Online:
November 17, 2008
Citation
Lam, TC, Shuster, LH, & Dewey, RP. "Risk Assessment of an L-0 Stage Blade Retrofit." Proceedings of the ASME 2004 Power Conference. ASME 2004 Power Conference. Baltimore, Maryland, USA. March 30–April 1, 2004. pp. 269-277. ASME. https://doi.org/10.1115/POWER2004-52058
Download citation file:
3
Views
0
Citations
Related Proceedings Papers
Related Articles
Effect of Condition Monitoring on Risk Mitigation for Steam Turbines in the Forest Products Industry
ASME J. Risk Uncertainty Part B (September,2017)
Approach to Unidirectional Coupled CFD–FEM Analysis of Axial Turbocharger Turbine Blades
J. Turbomach (January,2002)
A High-Accuracy Model Reduction for Analysis of Nonlinear Vibrations in Structures With Contact Interfaces
J. Eng. Gas Turbines Power (October,2011)
Related Chapters
Surface Analysis and Tools
Tribology of Mechanical Systems: A Guide to Present and Future Technologies
Environment Assisted Cracking of Steam Turbine Blade Steels – A Consistent Rationalization Based on Hydrogen Assisted Cracking
International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions
Corrosion Risk Analysis
Corrosion and Materials in Hydrocarbon Production: A Compendium of Operational and Engineering Aspects