Holiday detection, also known as porosity testing or spark testing, is a non-destructive testing (NDT) method used to detect and locate discontinuities or defects in the protective coatings on conductive substrates. This testing technique is primarily employed to ensure the integrity and durability of coatings applied to structures, pipelines, tanks, and other industrial equipment. The term “holiday” refers to any void, pinhole, crack, or gap in the coating that can expose the underlying substrate to corrosion or other forms of degradation
It’s important to note that the effectiveness of holiday detection relies on factors such as proper equipment calibration, operator training, and surface preparation. Regular inspections and maintenance of coatings are essential for extending the service life of assets and ensuring their continued performance and safety.
