ASTM G62-23
(Test Method)Standard Test Methods for Holiday Detection of Coatings used to Protect Pipelines
Standard Test Methods for Holiday Detection of Coatings used to Protect Pipelines
SIGNIFICANCE AND USE
5.1 Method A—Low voltage holiday detection is used to locate holidays and pinholes in thin-film coatings (up to 0.508 mm (20 mils) using a sponge wetted with tap water (and a wetting agent for coatings thicker than 10 mils). The water carries the current from the electrode through the holiday to the conductive substrate. The detector is grounded to the coated substrate. When the detector senses this flow of current it alarms.
5.2 Method B—High voltage holiday detection is used to locate holidays and pinholes in thick-film coatings (greater than 20 mils), but can be used on coatings as low as 10 mils thick. A test voltage is selected and set. A charged Electrode is placed in contact with the coating, and the Detector is grounded to the coated substrate. When Electrical Breakdown occurs, electric current flows between the Detector’s electrode and the conductive substrate and emits an audible alarm.
5.3 This standard does not apply to holiday detection of tape wraps used to protect pipe or coatings containing conductive raw materials such as conductive pigments and extenders.
5.4 The thickness of a coating applied to ductile iron pipe, fittings, or other iron castings may vary substantially due to the inherent roughness of the substrate. For these applications, consult the coating manufacturer for their recommended test voltage setting when using Method B. The coating manufacturer’s recommended test voltage setting may be subject to approval by the owner.
Note 1: Use of voltage settings lower than those listed in this standard may increase the likelihood of non-detection.
SCOPE
1.1 These test methods cover the apparatus and procedures for detecting pinholes and holidays in coatings used to protect pipelines.
1.2 Method A is designed to detect pinholes and holidays in thin-film coatings from 0.025 mm to 0.254 mm (1 mils to 10 mils) in thickness using ordinary tap water and an applied voltage of less than 100 V d-c. It is effective on films up to 0.508 mm (20 mils) thickness if a wetting agent is used with the water.
1.3 Method B is designed to detect pinholes and holidays in thick-film coatings >0.508 mm (20 mils) This method can be used on any thickness of pipeline coating and utilizes applied voltages between 3.4 and 35 kV d-c.
1.4 The values stated in SI units to three significant decimals are to be regarded as the standard. The values given in parentheses are for information only.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Buy Standard
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: G62 − 23
Standard Test Methods for
1
Holiday Detection of Coatings used to Protect Pipelines
This standard is issued under the fixed designation G62; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope and Polymer Precoated for Corrugated Steel Pipe
D149 Test Method for Dielectric Breakdown Voltage and
1.1 These test methods cover the apparatus and procedures
Dielectric Strength of Solid Electrical Insulating Materials
for detecting pinholes and holidays in coatings used to protect
at Commercial Power Frequencies
pipelines.
D7091 Practice for Nondestructive Measurement of Dry
1.2 Method A is designed to detect pinholes and holidays in
Film Thickness of Nonmagnetic Coatings Applied to
thin-film coatings from 0.025 mm to 0.254 mm (1 mils to
Ferrous Metals and Nonmagnetic, Nonconductive Coat-
10 mils) in thickness using ordinary tap water and an applied
ings Applied to Non-Ferrous Metals
voltage of less than 100 V d-c. It is effective on films up to
0.508 mm (20 mils) thickness if a wetting agent is used with
3. Terminology
the water.
3.1 Definitions:
1.3 Method B is designed to detect pinholes and holidays in
3.1.1 holiday, n—an interruption in the normal physical
thick-film coatings >0.508 mm (20 mils) This method can be
structure or configuration of a coating such as cracks, laps,
used on any thickness of pipeline coating and utilizes applied
seams, inclusions, porosity, discontinuities, or areas of low
voltages between 3.4 and 35 kV d-c.
coating thickness.
1.4 The values stated in SI units to three significant deci-
mals are to be regarded as the standard. The values given in
3.1.2 mil, n—0.001 in.
parentheses are for information only.
3.2 Definitions of Terms Specific to This Standard:
1.5 This standard does not purport to address all of the
3.2.1 dielectric strength, n—the maximum voltage an insu-
safety concerns, if any, associated with its use. It is the
lating material can withstand without undergoing electrical
responsibility of the user of this standard to establish appro-
breakdown. It is typically tested in accordance with Test
priate safety, health, and environmental practices and deter-
Method D149.
mine the applicability of regulatory limitations prior to use.
3.2.2 electrical breakdown, n—a process that occurs when
1.6 This international standard was developed in accor-
an insulating material, subjected to high enough voltage,
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the suddenly becomes an electrical conductor and electrical current
Development of International Standards, Guides and Recom- flows through it.
mendations issued by the World Trade Organization Technical
3.2.3 electrode, n—a conductive surface that is charged by
Barriers to Trade (TBT) Committee.
the Holiday Detector and placed against the coating to be
tested. Common electrode configurations include sponges for
2. Referenced Documents
low voltage detectors and brushes and springs for high voltage
2
2.1 ASTM Standards:
detectors.
A742/A742M Specification for Steel Sheet, Metallic Coated
3.2.4 high voltage voltmeter, n—a device capable of mea-
suring the voltage between the electrode and the ground
1
These test methods are under the jurisdiction of ASTM Committee D01 on
connection of a High Voltage Holiday Detector. When used
Paint and Related Coatings, Materials, and Applications and are the direct
with a Pulse DC High Voltage Holiday Detector, the High
responsibility of Subcommittee D01.48 on Durability of Pipeline Coating and
Voltage Voltmeter shall be a peak reading voltmeter.
Linings.
Current edition approved Oct. 1, 2023. Published October 2023. Originally
3.2.5 holiday detector, n—a highly sensitive electrical de-
approved in 1979. Last previous edition approved in 2022 as G62 – 22. DOI:
10.1520/G0062-23.
vice designed to detect holidays, pinholes, voids, and thin spots
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
in a coating having a relatively high-electrical resistance
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
applied to a surface of low electrical resistance such as steel
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. pipe.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- P
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: G62 − 22 G62 − 23
Standard Test Methods for
Holiday Detection in Pipeline Coatingsof Coatings used to
1
Protect Pipelines
This standard is issued under the fixed designation G62; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 These test methods cover the apparatus and procedureprocedures for detecting holidays in pipeline type coatings.pinholes and
holidays in coatings used to protect pipelines.
1.2 Method A is designed to detect holidays such as pinholes and voidsholidays in thin-film coatings from 0.0250.025 mm to 0.254
mm (1 to 10 mils) (1 mils to 10 mils) in thickness using ordinary tap water and an applied voltage of less than 100 V d-c. It is
effective on films up to 0.508 mm (20 mils) 0.508 mm (20 mils) thickness if a wetting agent is used with the water. It should be
noted, however, that this method will not detect thin spots in the coating. This may be considered to be a nondestructive test
because of the relatively low voltage.
1.3 Method B is designed to detect holidays such as pinholes and voids in pipeline coatings; but because of the higher applied
voltages, it can also be used to detect thin spots in the coating. holidays in thick-film coatings >0.508 mm (20 mils) This method
can be used on any thickness of pipeline coating and utilizes applied voltages between 900 and 20 000 V 3.4 and 35 kV d-c. This
method is considered destructive because the high voltages involved generally destroy the coating at thin spots.
1.4 The values stated in SI units to three significant decimals are to be regarded as the standard. The values given in parentheses
are for information only.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
A742/A742M Specification for Steel Sheet, Metallic Coated and Polymer Precoated for Corrugated Steel Pipe
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at
Commercial Power Frequencies
1
These test methods are under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and are the direct responsibility of
Subcommittee D01.48 on Durability of Pipeline Coating and Linings.
Current edition approved Aug. 15, 2022Oct. 1, 2023. Published August 2022October 2023. Originally approved in 1979. Last previous edition approved in 20142022 as
G62 – 14.G62 – 22. DOI: 10.1520/G0062-22.10.1520/G0062-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
G62 − 23
D7091 Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals
and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals
3. Terminology
3.1 Definitions:
3.1.1 holiday, n—small faults or pinholes that permit current drainage through protective coatings on steel pipe or polymeric
precoated corrugated steel pipe.an interruption in the normal physical structure or configuration of a coating such as cracks, laps,
seams, inclusions, porosity, discontinuities, or areas of low coating thickness.
3.1.2 mil, n—0.001 in.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 dielectric strength, n—the maximum voltage an insulating material can withstand without undergoing electrical breakdown.
It is typically tested in accordance with Test Method D149.
3.2.2 electrical breakdown, n—a process that o
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.