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Structural Integrity’sHydroelectric Experience
Analysis of new and existing structures
Some of the largest hydroelectric utilities in the world have looked to Structural Integrity for evaluation of penstocks, turbine rotors, and other pressure boundary components, from failure analysis to vibration monitoring to evaluation for continued operation. Here are some examples of our hydroelectric engineering experience.
For more information, please contact:
Call Toll Free 877-474-7693
Visit our website at: www.structint.com
Email: [email protected]
EMAT inspection of longitudinal riveted joint
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Conceptual Design, Engineering, Analysis of Pad Repair for multiple pressure tapping points on the six distributors of a penstock for a Hydroelectric Power Station. ASME Code Qualification of penstock, flange, repair. Inspection and Integrity Assessments of penstock distributors along with UT inspection of weld repairs.
■ Fitness for Service and Burst Pressure Evaluation for a penstock at a Hydroelectric Generating Station. Project included an elastic-plastic analysis for computing stress margins at riveted joints between penstock shell members.
■ Finite Element Analysis for the pillow block support frame of a 103-ton flood gate hoist at a Hydroelectric Dam to evaluate the stresses on the bolts and fatigue failure.
■ Deterministic Fracture Mechanics and Probabilistic Fracture Mechanics techniques in establishing an inservice inspection program for a buried penstock in order to demonstrate the acceptability of extending inservice inspection intervals while maintaining acceptable levels of safety.
■ Evaluation of the structural integrity of distorted spillway radial gates at a Hydroelectric Dam. Included the structural capacity of the gates, and design of modifications to prevent structural distortions.
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Design of Test Fixture for burst test of a section of a riveted joint of a penstock. Testing and performance evaluation of inspection technologies for riveted penstocks; included an industry study on degradation mechanisms.
■ Structural evaluation of a offshore intake tower and outlet conduit. Tasks included seismic acceptability of the intake tower using finite element analysis techniques when subjected to a maximum credible earthquake and flow-induced vibrations at the exit of the conduit.
■ Technical Review of vibration in Hydroelectric Instream Flow Release Bypass piping. Review included analyzing vibration test data, finite element analysis results and fatigue evaluations.
■ Inspection and Integrity Assessments of steel penstocks at fifty-five (55) hydro power houses.
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Visual and Non-destructive Examination of a Municipal Penstock, including assessment for continued operation. Engineering Consulting on evaluation methodologies and inspection technologies.
Inspection and Integrity Assessments of four (4) steel penstocks. Critical Review of Steel Penstock Inspection Guideline and Steel Penstock Assessment Guide.
■ Inspection and Integrity Assessment of tunnel liner.
■ Short Range Guided Wave with EMAT inspection for monitoring crevice corrosion in penstock lap joints. Lap joint area is covered in concrete and hence external surface was not easily accessible.
Areas of Expertise ■ Understanding of Degradation Mechanisms ■ Defect Analysis/Assessment using Finite Element Analysis, Linear Elastic
Fracture Mechanics, Elastic-Plastic Fracture Mechanics ■ Inspection/Assessment Programs ■ Inspection Data Management ■ Corrosion Monitoring ■ Steel Penstock Aging Management Programs
Structural Integrity Disciplines/Product Offerings ■ Structural/Stress Analysis ■ Fracture Mechanics ■ Hydraulics ■ Metallurgy and Welding ■ Probabilistic Risk Assessment ■ Vibration Monitoring and Analysis ■ Destructive Examination ■ Non-Destructive Examination ■ Turbine Inspection/Evaluation ■ ASME and ASCE Code Evaluations
Civil Engineering Assignments ■ Hydrologic Studies ■ Hydraulics and hydraulic structures evaluation, analysis and design of dams,
hydroelectric facilities including CFD, transients and structural FEM ■ Slope stability and stabilization evaluation and analysis including the design of
earth retaining structures including rock bolting, soil nailing and MSE walls ■ Materials testing and analysis
Structural engineering assignments ■ Structural design and analysis of new and existing bridges, buildings, and
facilities such as dams, spillways, stilling basins, gates, penstocks, and powerhouse structures
■ Structural inspections, load rating, and evaluation of existing bridges, buildings and facilities
■ Seismic analysis of structures and seismic retrofit designs ■ Design modifications or additions to existing dams and hydroelectric facilities
Mechanical Engineering Assignments ■ Analysis of gate or other system operations ■ Equipment failure analysis ■ Metallurgical analysis
Dam Safety Engineering Assignments ■ Dam stability Finite Element Model analysis including the modeling of the
rock abutments and the soil/ structure/ impoundment interaction ■ Site specific seismic characterization including deterministic and probabilistic
seismic hazard analysis and the synthesis is spectral and time history accelerations
■ Probable maximum flood studies and analysis ■ Risked based dam safety assessment ■ Specialized embankment and concrete dam analysis and design
Corrosion monitoring of aging penstocks
True Elastic-Plastic Stress Analysis Von Mises Stress Plot
Penstock Longitudinal
Riveted Joint Finite Element Model
Rotary Valve-Penstock Flange Sub-Assembly Qualification
For more information, please contact:
Call Toll Free 877-474-7693
Visit our website at: www.structint.com
Email: [email protected]
