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Blade RCA Processes and Inspection Methodsat Younger Sites
Ben RiceSandia 2016 Wind Turbine Blade WorkshopAugust, 2016
Pattern Energy Introduction
Current Operating Capacity: 3,300 MWNumber of Turbines: 1,550Turbine Manufacturers in Fleet: Siemens (65%), Mitsubishi (10%), GE (25%)Average Age of Sites: 3 years!
§ Let’s Talk Hypothetical§ Early Failures: RCAs During the Warranty Period§ The Importance of Early Data Collection§ Blade Inspections & Planning for Future Failures
Let’s Talk Hypothetical
Let’s Talk Hypothetical
• 2 year old site• 100 turbines• 3 year warranty• Service contract with the original OEM• Catastrophic blade failure on one turbine
Without knowing if the failure is systemic, what questions do you ask?
Let’s Talk Hypothetical
Questions:• Who acts as primary for the RCA?• How will all parties interact for project management?• What RCA and inspection methods will be used?• Do you take all turbines down until more is known?• Do you treat it as a one-off, or do you plan a full
inspection sweep of all turbines?• Who is in charge of data collection and sharing amongst
parties?• How will inspection, RCA, replacement, and lost energy
costs be distributed?
Early Failures: RCAs During the Warranty Period
New sites for smaller owner/operators come with contractual complexities:
(1) Original OEM as service provider or 3rd party TSP
Who manages the RCA process?
(2) Warranty coverage for major components
What questions is each party/group trying to answer?
The Importance of Early Data Collection
Do you know the full history of your blades?• Installation dates• Model & serial numbers• Past damages & repair history• Past inspections (dates, results, follow ups)
Do you have reliable access to SCADA and MET data?• Extreme wind conditions• Vibration and load alarms & warnings• Lightning strike data
The Importance of Early Data Collection
The Importance of Early Data Collection
Blade Inspections & Planning for Future Failures
Blade failures can happen without warning, but what are you doing to monitor for symptoms of future failure?
• Tracking major weather patterns and events and following up proactively with targeted inspections
• Periodic sampling of down-tower, on-blade, or drone inspections - (visual, ultrasound, IR, etc.)
• Having a health categorization criteria for inspections• Data repository for historical inspection results and
actions