Looking for field experience with conductive carbon-fiber reinforced coatings and holiday detection.
Traditional high-voltage holiday testing assumes a non-conductive coating over a conductive substrate. Carbon-fiber reinforced coatings complicate that approach because the coating itself may be conductive.
For those who have worked with conductive carbon-fiber coating systems:
- What methods have you successfully used to verify coating integrity and detect holidays?
- Which methods have proven reliable in actual field service?
- Which methods have produced false positives, false negatives, or other limitations?
Methods I am aware of include:
- Conductive backing layers
- Conductive primers
- Conductive meshes, veils, or scrims
- Embedded metallic grids
- Grounding through embedded steel
- UV dye / fluorescent tracer systems
- Spark testing with modified grounding arrangements
- Alternative NDT methods
- Manufacturer-specific procedures
Questions:
- Which of these methods have you actually used in the field?
- Which method provided the most reliable results?
- Were the procedures manufacturer-specified or project-specific?
- Are there any applicable standards, case studies, technical papers, or manufacturer bulletins addressing holiday detection of conductive carbon-fiber coatings?
- Have any of these methods been validated against known defects or intentionally created holidays?
Interested in hearing real-world experience, lessons learned, and any references that discuss successful inspection of conductive carbon-fiber coating systems.
Traditional high-voltage holiday testing assumes a non-conductive coating over a conductive substrate. Carbon-fiber reinforced coatings complicate that approach because the coating itself may be conductive.
For those who have worked with conductive carbon-fiber coating systems:
- What methods have you successfully used to verify coating integrity and detect holidays?
- Which methods have proven reliable in actual field service?
- Which methods have produced false positives, false negatives, or other limitations?
Methods I am aware of include:
- Conductive backing layers
- Conductive primers
- Conductive meshes, veils, or scrims
- Embedded metallic grids
- Grounding through embedded steel
- UV dye / fluorescent tracer systems
- Spark testing with modified grounding arrangements
- Alternative NDT methods
- Manufacturer-specific procedures
Questions:
- Which of these methods have you actually used in the field?
- Which method provided the most reliable results?
- Were the procedures manufacturer-specified or project-specific?
- Are there any applicable standards, case studies, technical papers, or manufacturer bulletins addressing holiday detection of conductive carbon-fiber coatings?
- Have any of these methods been validated against known defects or intentionally created holidays?
Interested in hearing real-world experience, lessons learned, and any references that discuss successful inspection of conductive carbon-fiber coating systems.
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Leroy Zogg
Aquilla TX
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