ASTM G62-07
(Test Method)Standard Test Methods for Holiday Detection in Pipeline Coatings
Standard Test Methods for Holiday Detection in Pipeline Coatings
SIGNIFICANCE AND USE
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.
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 0.0254 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). 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 20000 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.
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.
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Designation: G62 − 07
StandardTest Methods for
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Holiday Detection in Pipeline Coatings
ThisstandardisissuedunderthefixeddesignationG62;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
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
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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 0.0254 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.
will not detect thin spots in the coating, even those as thin as
3.1.2 mil, n—0.001 in.
0.635 mm (25 mils). This may be considered to be a nonde-
3.2 Definitions of Terms Specific to This Standard:
structive test because of the relatively low 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.
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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.
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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, 2007. Published July 2007. Originally approved
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in 1979. Last previous edition approved in 1998 as G62 – 87 (1998) which was
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withdrawn March 2007 and reinstated in July 2007. DOI: 10.1520/G0062-07. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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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
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G62−07
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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
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