Life Assessment of Cracked Steam Turbine Rotors with
LPRimLife for Windows
software to assess the remaining life of LP rotors with known or suspected rim-attachment cracking.
Stress corrosion cracking (SCC) in the blade attachment region of LP turbine rotors is the most significant problem affecting steam turbines today. This code, which was developed for EPRI by Structural Integrity Associates (SI), combines the necessary stress analysis and fracture mechanics algorithms with applicable material degradation data to provide an easy-to-use tool to estimate the remaining life of LP rotors with rim-attachment cracking. The first two phases of code development, incorporating the methodology for evaluating GE tangential-entry dovetails and Westinghouse axial-entry steeples, are complete and the third phase, to evaluate cracking in Pin-Finger attachments, is under way.
Features built-in to the PC-based code include:
- Easy-to-use Windows graphical user interface
- Comprehensive on-line help
- Built-in library of stress solutions
- Fracture mechanics stress intensity factor calculator
- Fracture toughness vs. FATT data for 3.5NiCrMoV disks
- Algorithm for redistribution of load between top, middle and bottom hooks with cracking
- Limit load check for overload failure
- SCC threshold effects to simulate crack arrest
- Deterministic and probabilistic calculation options
- Graphics and plotting capability for presentation of results
Technical Paper Publications:
For more information, please contact Darryl Rosario.
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LPRimLife Software Development for GE Tangential-Entry Dovetail Cracking (Phase I)