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NACE SP0274

High-Voltage Electrical Inspection of Pipeline Coatings

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Organization: NACE
Publication Date: 1 August 1974
Status: active
Page Count: 8
scope:

General

Electrical inspection (holiday detection) is a test of the continuity of a protective coating. This type of inspection does not provide information concerning coating resistance, bond, physical characteristics, or the overall quality of the coating, nor is it intended to do so. It detects bubble or blister-type voids, cracks, thin spots, and foreign inclusions or contaminants in the coating that are of such size, number, or conductivity as to significantly lower the electrical resistance or dielectric strength of the coating.

An initial electrical inspection, performed as soon after the application of the coating as practical, serves to check the materials and the application procedures. A final coating inspection, performed before lowering-in operations, will disclose any defect or damage (except disbonding) that has occurred during the construction period.

This standard presents acknowledged techniques for the use of holiday detectors currently used on pipeline coatings and presents a table of minimum testing voltages for various coating thicknesses. These minimum testing voltages do not apply to thin-film coatings (i.e., coating materials usually applied by a fusion-bonding process). Thin-film pipeline coatings are generally applied to a dry film thickness less than 0.5 mm (20 mil).

Document History

NACE SP0274
August 1, 1974
High-Voltage Electrical Inspection of Pipeline Coatings
General Electrical inspection (holiday detection) is a test of the continuity of a protective coating. This type of inspection does not provide information concerning coating resistance, bond,...
August 1, 1974
High-Voltage Electrical Inspection of Pipeline Coatings
General Electrical inspection (holiday detection) is a test of the continuity of a protective coating. This type of inspection does not provide information concerning coating resistance, bond,...
August 1, 1974
High-Voltage Electrical Inspection of Pipeline Coatings
A description is not available for this item.
August 1, 1974
High-Voltage Electrical Inspection of Pipeline Coatings Prior to Installation
A description is not available for this item.

References

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