Life Assessment of
Cracked Steam Turbine Rotors with
LPRimLife for Windows
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. Code development included three phases, incorporating the methodology for evaluating GE tangential-entry dovetails (Phase I), Westinghouse axial-entry steeples (Phase II), and GE Pin-Finger attachments (Phase III).
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:
LPRimLife Software Development
for GE Tangential-Entry Dovetail Cracking (Phase I)
LPRimLife Software Development
for Westinghouse & ABB Axial-Entry Steeple Cracking (Phase
II)
LPRimLife Software Development for GE & Westinghouse Attachments (Phases I, II & III)
Article on
LPRimLife Published in Power Engineering Magazine
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