Discontinuity Test
Pinhole Detection
Holiday Detection

▣ ASME B31.1 Power Piping
IV-2.2.3 Pipe coatings should be inspected visually with a holiday detector and thickness gage prior to backfilling the excavation. Any bare spots, thin areas, holidays, or other damage to the coating should be repaired and reexamined prior to backfilling.

▣ ASTM G62 Standard Test Methods for Holiday Detection in Pipeline Coatings
3.1 holiday – small faults or pinholes that permit current drainage through protective coatings on steel pipe or polymetric precoated corrugated steel pipe

▣ ASTM D5162 Standard Practice for Discontinuity (Holiday) Testing
▣ NACE SP0188 Discontinuity (holiday) Testing of New Protective Coating
▣ NACE SP0274 High Voltage Electrical Inspection of Pipeline Coatings
▣ NACE SP0490 Holiday Detection of Fusion Bonded Epoxy
Discontinuity : A void, crack, thin spot, foreign material inclusion, or contamination in the coating film that significantly lowers the electrical resistance of the coating. May also be identified as a holiday or pinhole.
Holiday : A discontinuity in a protective coating that exposes unprotected surface to the environment; a term used interchangeably with discontinuity.



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