ASTM G62-14
(Test Method)Standard Test Methods for Holiday Detection in Pipeline Coatings
Standard Test Methods for Holiday Detection in Pipeline Coatings
SIGNIFICANCE AND USE
5.1 Method A—Method A describes a quick, safe method for determining if pinholes, voids, or metal particles are protruding through the coating. This method will not, however, find any thin spots in the coating. This method will determine the existence of any gross faults in thin-film pipeline coatings.
5.2 Method B—Method B describes a method for determining if pinholes, voids, or metal particles are protruding through the coating, and thin spots in pipeline coatings. This method can be used to verify minimum coating thicknesses as well as voids in quality-control applications.
SCOPE
1.1 These test methods cover the apparatus and procedure for detecting holidays in pipeline type coatings.
1.2 Method A is designed to detect holidays such as pinholes and voids in thin-film coatings from 0.025 to 0.254 mm (1 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. 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. This method can be used on any thickness of pipeline coating and utilizes applied voltages between 900 and 20 000 V d-c.2 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 and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Designation: G62 − 14
Standard Test Methods for
1
Holiday Detection in Pipeline Coatings
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.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
3
2.1 ASTM Standards:
1.1 These test methods cover the apparatus and procedure
A742/A742M Specification for Steel Sheet, Metallic Coated
for detecting holidays in pipeline type coatings.
and Polymer Precoated for Corrugated Steel Pipe
1.2 Method A is designed to detect holidays such as pin-
holes and voids in thin-film coatings from 0.025 to 0.254 mm 3. Terminology
(1 to 10 mils) in thickness using ordinary tap water and an
3.1 Definitions:
applied voltage of less than 100 V d-c. It is effective on films
3.1.1 holiday, n—smallfaultsorpinholesthatpermitcurrent
up to 0.508 mm (20 mils) thickness if a wetting agent is used
drainagethroughprotectivecoatingsonsteelpipeorpolymeric
with the water. It should be noted, however, that this method
precoated corrugated steel pipe.
willnotdetectthinspotsinthecoating.Thismaybeconsidered
3.1.2 mil, n—0.001 in.
to be a nondestructive test because of the relatively low
3.2 Definitions of Terms Specific to This Standard:
voltage.
3.2.1 holiday detector, n—a highly sensitive electrical de-
1.3 Method B is designed to detect holidays such as
vice designed to locate holidays such as pinholes, voids, and
pinholes and voids in pipeline coatings; but because of the
thin spots in the coating, not easily seen by the naked eye.
higher applied voltages, it can also be used to detect thin spots
These are used on the coatings of relatively high-electrical
in the coating. This method can be used on any thickness of
resistance when such coatings are applied to the surface of
pipeline coating and utilizes applied voltages between 900 and
materials of low-electrical resistance, such as steel pipe.
2
20 000 V d-c. This method is considered destructive because
3.2.2 pipeline type coating, n—coatings of relatively high-
the high voltages involved generally destroy the coating at thin
electrical resistance applied to surfaces of relatively low-
spots.
electrical resistance, such as steel pipe.
1.4 The values stated in SI units to three significant deci-
4. Summary of Test Methods
mals are to be regarded as the standard. The values given in
parentheses are for information only.
4.1 Both methods rely on electrical contact being made
through the pipeline coating because of a holiday or a
1.5 This standard does not purport to address all of the
low-resistance path created by metal particles, or thin spots in
safety concerns, if any, associated with its use. It is the
the coating. This electrical contact will activate an alarm
responsibility of the user of this standard to establish appro-
alerting the operator of the incidence of a holiday.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4.2 In Method A, the applied voltage is 100 V d-c or less.
4.3 In Method B, the applied voltage is 900 to 20 000
V d-c.
1
These test methods are under the jurisdiction of ASTM Committee D01 on
5. Significance and Use
Paint and Related Coatings, Materials, and Applications and are the direct
responsibility of Subcommittee D01.48 on Durability of Pipeline Coating and
5.1 MethodA—MethodAdescribesaquick,safemethodfor
Linings.
determiningifpinholes,voids,ormetalparticlesareprotruding
Current edition approved July 1, 2014. Published July 2014. Originally approved
in 1979. Last previous edition approved in 2013 as G62 – 07 (2013). DOI:
3
10.1520/G0062-14. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
2
This was taken from the pamphlet “Operating Instructions forTinker and Rasor contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Model EP Holiday Detector.” Other manufacturers’ holiday detectors can be Standards volume information, refer to the standard’s Document Summary page on
expected to have similar voltage specifications. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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G62−14
1
through the coating. This method will not, however, find any a selected resistance, having a ⁄2 W rating, is placed across its
thin spots in the coating. This method will determine the terminals.Acommon factory setting for sensitivity is 100 000
existence of any gross faults in thin-film pipeline coatings. Ω. Most units can be reset to any predetermined sensitivity
value in th
...
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 − 07 (Reapproved 2013) G62 − 14
Standard Test Methods for
1
Holiday Detection in Pipeline Coatings
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 procedure for detecting holidays in pipeline type coatings.
1.2 Method A is designed to detect holidays such as pinholes and voids in thin-film coatings from 0.02540.025 to 0.254 mm
(1 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. It should be noted, however, that this method will not detect
thin spots in the coating, even those as thin as 0.635 mm (25 mils). 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. This method can be used on any thickness of pipeline coating and
2
utilizes applied voltages between 900 and 20 000 V 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
3
2.1 ASTM Standards:
A742/A742M Specification for Steel Sheet, Metallic Coated and Polymer Precoated for Corrugated Steel Pipe
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.
3.1.2 mil, n—0.001 in.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 holiday detector, n—a highly sensitive electrical device designed to locate holidays such as pinholes, voids, and thin spots
in the coating, not easily seen by the naked eye. These are used on the coatings of relatively high-electrical resistance when such
coatings are applied to the surface of materials of low-electrical resistance, such as steel pipe.
3.2.2 pipeline type coating, n—coatings of relatively high-electrical resistance applied to surfaces of relatively low-electrical
resistance, such as steel pipe.
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 June 1, 2013July 1, 2014. Published June 2013July 2014. Originally approved in 1979. Last previous edition approved in 20072013 as
G62 – 07.G62 – 07 (2013). DOI: 10.1520/G0062-07R13.10.1520/G0062-14.
2
This was taken from the pamphlet “Operating Instructions for Tinker and Rasor Model EP Holiday Detector.” Other manufacturers’ holiday detectors can be expected
to have similar voltage specifications.
3
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 − 14
4. Summary of Test Methods
4.1 Both methods rely on electrical contact being made through the pipeline coating because of a holiday or a low-resistance
path created by metal particles, or thin spots in the coating. This electrical contact will activate an alarm alerting the operator of
the incidence of a holiday.
4.2 In Method A, the applied voltage is 100 V d-c or less.
4.3 In Method B, the applied voltage is 900 to 20 000 V d-c.
5. Significance and Use
5.1 Method A—Method A describes a quick, safe met
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