Key Points
- Internal web reinforcement required under High Risk Confined Space Regulations
- Damage Located 8 Metres from the root in-between web A and B
- 2 days to complete including setup of habitat
Investigation
In order to correctly identify the depth of the debonding/glue cracks in the web foot we had to begin by removing top layers of fiberglass. Once the fiberglass layers were removed, the glue that is used during production to bond the web to the internal shell was exposed. It was clear that the glue was cracked in its entirety. There were also areas of uncured bonding paste found in some areas. This led us to our root cause analysis.
- It was clear the glue was cracked entirely
- Areas of uncured bonding paste found in defect area helping us identify root cause analysis
Repair
Upon recording that the glue was substantially damaged, it was decided that we would remove all glue from the web foot. This left the Web and Inner shell free from any glue and sitting at a 90 degree angle.
The area was cleaned and prepared for the lamination process. Before laminating, bonding paste was used to reduce the 90 degree angle between the web and webfoot. Reinforcement lamination was completed using Bladestar recommended work instruction for the task.
Upon completion of the laminate, the habitat was removed and the full blade cleaned in order for the turbine to be placed back into service.
- Before laminating, bonding paste was used to reduce the 90 degree angle between the web and webfoot
- Reinforcement lamination was completed using Bladestar recommended work instruction for the task
- Project was under budget resulting in a very happy customer.
