In case of conductive reinforcing elements in resin protective coating on metalic pipes, holiday / spark test method is not effectively differenciate the actual discontinuity in the coating from the its intrinsic false calls due to its conductive nature. We are looking for an alternate method to 'Holiday test' to detect the actual spots of discontinuity in our corrosion protection coating on metalic pipes.
We are looking for the equipment or technique
High Voltage Porosity Detection can be used to locate flaws and defects in a coating on the surface of a conductive substrate.There are two main types of High Voltage Porosity Detector, the Continuous DC type and the Pulsed DC type. High Voltage AC (alternating current) Holiday Detectors are also available.
I would recommend a magnetic particles inspection techniques, see the following:
https://www.youtube.com/watch?v=33m66-3L-9A
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