Blade Repair Service Guidance 20 May 2015 WindCom Wind Composite Services Owned by Tecsis 2 nd largest wind blade producer globally Servicing blades since 2007 Data base of inspected and repaired blades ID: 634572
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Slide1Slide2
Wind Composite Services Group
Blade Repair Service Guidance
20 May, 2015Slide3
WindCom
Wind Composite Services
Owned by Tecsis, 2nd
largest wind blade producer globally.
Servicing blades since 2007.
Data base of ___________inspected and repaired blades.
Three types of work platforms available for up tower repairs.
Engineers on hand to backup service teams.
QC of every repair before departure from site.
Slide4
Safety FirstSlide5
Approach to Blade RepairsSlide6
Non-Structural Repairs
Non-Structural damage does not affect the blade’s
sparcap
or bonds.
SparcapSlide7
Non-Structural RepairsSlide8
Leading Edge ErosionSlide9
Further Neglect Can Result in Worse DamageSlide10
Lightning Damage
Neglecting lightning damage can lead to serious problems
Lightning Protection System (LPS) may be compromised.Slide11
Do you have written work instructions for this repair?
Are the materials either the same or similar to the OEM’s?
What resin system are you using? Epoxy or Polyester? Is it compatible?
What is the fairing compound? Bondo, epoxy or Polyurethane?What paint are you using?
While
up-tower
can you check the LPS? Drain hole?
Questions for the ISPSlide12
Can the blade be repaired successfully?
If so can it be done up tower, downtower
or shipped to a factory?
Is the repair worth the money?
Worth the risk?
Are there other alternatives?
Do you or your ISP have the knowledge to
m
ake a good decision?
Structural DamageSlide13
A Few Examples of Structural Damage
Interior cracks
Core
debondedSlide14
Decision to repair up tower
may
be easy in some
cases.
But again ask questionsSlide15
Do we know the Root Cause of the damage?
Did we address the root cause to prevent further damage after repairs?
Do we have enough information to make a good decision as whether to repair or replace?
Did we do a risk analysis?
Questions to Ask YourselfSlide16
Do they have written work Instructions?
If so, on what are they based?
Does the ISP have an in house composite engineer? Analytical tools?
Do they have experience in this repair? Price cap?
Warranty?
Is the access method appropriate for the repairs?
Challenge the ISPSlide17
Root Cause Analysis
Identify key contributors to the blade damage
Underestimated
design loads
Malfunctioning of control and safety systems
Abnormal environmental conditions
Manufacturing defects
Design related issuesSlide18
Structural
Analysis and
ValidationPerform structural analysis based on operating
conditions.
Simulate and
validate
structural response to field test data
.Slide19
Do we have photos such as these? Or the capabilities? Slide20
Based on results obtained, a detailed repair solution is prescribed.
Optimized laminate schedule is determined based on structural analysis
Repairs are validated during repairs
Documentation of the work is retained
Engineered RepairsSlide21
Know what questions to ask
Make decisions based on facts, data and financial sense
Don’t be afraid to go to outside help
Engineered solutions lead to longer asset life Lead to overall savings in O&M costs
Summary