Blade Repairs 2017

Blade Repairs 2017

Wind Turbine Blade Repair and Maintenance

 

With years of experience, our specialists can make repairs that prolong the lifespan and overall effectiveness of the asset and can fix damage caused by: leading edge erosion; bond-line failure; moisture intrusion; freeze/thaw cycling; and installation and lightning damage.

We offer comprehensive solutions through a combination of inspection, preventive maintenance and repair. Preventive maintenance and inspection are essential to maximise asset lifespan, asset integrity and return on investment.

Blade Repair

Example 1: TE CRACK, BALSA AND FOAM REPLACEMENT

The damage was a chordwise crack on the trailing edge. Upon investigation, a large area of core material (both balsa and foam) was found to be damaged due to water ingress. The extent of the damage was established using a moisture meter. The damaged core material was removed, and new material was bonded in place.

Appropriate chamfers were ground into the surrounding laminate. Eleven layers of fibreglass were applied over the repair area to replace the glass that had been removed. The repair was allowed to cure and then post curing was carried out using heat blankets. Filler was applied to restore original blade geometry followed by top coat paint.


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Blade Repair Examples 2017 as a PDF document

EXAMPLE 2 – LIGHTNING STRIKE TO CABLE WITHIN THE INNER SKIN – INNER SKIN LAMINATION AND BALSA REPLACEMENT

Lightning damage to the pressure side of the blade 44m from the root. Balsa humidity test was taken from the centre of the damage, various other holes were drilled towards the leading edge, trailing edge, root and tip to establish size of the damage.
The glass and balsa were removed within the damaged area. The lightning damage was found to extend to the inner skin- the strike hitting the lightning cable within the blade. The damage was removed and a backing plate was inserted to create a surface to laminate on.

Small strips of biax were put on top of the backing plate to make it flat. Technicians then put 2 layers of UD over the area of the bow tie before covering the full damaged area with 1 cover biax. The fibreglass was cured with a heating blanket. Balsa was placed into the damaged area. The balsa was sanded flat before 1 biax, 2 layers of UD and 2 covering biax. Damage again cured, filler and paint applied.


View more blade repair examples by filling in the form below and download our
Blade Repair Examples 2017 as a PDF document


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