ASTM D5162-08

Standard Practice for Discontinuity (Holiday) Testing of Nonconductive Protective Coating on Metallic Substrates

SIGNIFICANCE AND USE
A coating is applied to a metallic substrate to prevent corrosion, reduce abrasion or reduce product contamination, or all three. The degree of coating continuity required is dictated by service conditions. Discontinuities in a coating are frequently very minute and not readily visible. This practice provides a procedure for electrical detection of minute discontinuities in nonconductive coating systems.
Electrical testing to determine the presence and number of discontinuities in a coating film is performed on a nonconductive coating applied to an electrically conductive surface. The allowable number of discontinuities should be determined prior to conducting this test since the acceptable quantity of discontinuities will vary depending on coating film thickness, design, and service conditions.
The low voltage wet sponge test equipment is generally used for determining the existence of discontinuities in coating films having a total thickness of 0.5 mm (20 mil) or less. High voltage spark test equipment is generally used for determining the existences of discontinuities in coating films having a total thickness of greater than 0.5 mm (20 mil).
Coatings that are applied at a thickness of less than 0.5 mm (20 mil) may be susceptible to damage if tested with high voltage spark testing equipment. Consult the coating manufacturer for proper test equipment and inspection voltages.
To prevent damage to a coating film when using high voltage test instrumentation, total film thickness and dielectric strength in a coating system shall be considered in selecting the appropriate voltage for detection of discontinuities. Atmospheric conditions shall also be considered since the voltage required for the spark to gap a given distance in air varies with the conductivity of the air at the time the test is conducted. Suggested starting voltages are provided in Table 1.
The coating manufacturer shall be consulted to obtain the following information, which would affect the a...
SCOPE
1.1 This practice covers procedures for determining discontinuities using two types of test equipment:
1.1.1 Test Method A—Low Voltage Wet Sponge, and
1.1.2 Test Method B—High Voltage Spark Testers.
1.2 This practice addresses metallic substrates. For concrete surfaces, refer to Practice D 4787.
1.3 The values stated in SI units are to re regarded as the standard. The values given in parentheses immediately following the metric units are for information only.
1.4 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

• Status: Historical
• Publication Date: 31-May-2008
• ICS: 25.220.20 - Surface treatment
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.46 - Industrial Protective Coatings

Relations

• Replaces: ASTM D5162-01 - Standard Practice for Discontinuity (Holiday) Testing of Nonconductive Protective Coating on Metallic Substrates
• Effective Date: 01-Jun-2008
• Referred By: ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
• Effective Date: 01-Jun-2008
• Referred By: ASTM D7602-11(2017) - Standard Practice for Installation of Vulcanized Rubber Linings
• Effective Date: 01-Jun-2008
• Referred By: ASTM B1000-21 - Standard Practices for Casting Preparation and Test Procedure of Porcelain Enamel-lined Pipe, Fittings, and Valves for Use in the Municipal Wastewater, Sewage, and Water Treatment Industry
• Effective Date: 01-Jun-2008
• Referred By: ASTM D6137-97(2018) - Standard Test Method for Sulfuric Acid Resistance of Polymer Linings for Flue Gas Desulfurization Systems
• Effective Date: 01-Jun-2008
• Referred By: ASTM D6943-15(2019) - Standard Practice for Immersion Testing of Industrial Protective Coatings and Linings
• Effective Date: 01-Jun-2008
• Referred By: ASTM D5498-12a(2018) - Standard Guide for Developing a Training Program for Personnel Performing Coating and Lining Work Inspection for Nuclear Facilities
• Effective Date: 01-Jun-2008
• Referred By: ASTM D4787-13(2018) - Standard Practice for Continuity Verification of Liquid or Sheet Linings Applied to Concrete Substrates
• Effective Date: 01-Jun-2008
• Referred By: ASTM D3276-21 - Standard Guide for Painting Inspectors (Metal Substrates)
• Effective Date: 01-Jun-2008
• Referred By: ASTM D4538-21 - Standard Terminology Relating to Protective Coating and Lining Work for Power Generation Facilities
• Effective Date: 01-Jun-2008

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D5162 − 08
StandardPractice for
Discontinuity (Holiday) Testing of Nonconductive Protective
1
Coating on Metallic Substrates
This standard is issued under the fixed designation D5162; 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 coating film that significantly lowers the dielectric strength of
the coating film. A discontinuity may also be identified as a
1.1 This practice covers procedures for determining discon-
holiday or pinhole.
tinuities using two types of test equipment:
3.1.2 holiday, as used in this standard, n—a term that
1.1.1 Test Method A—Low Voltage Wet Sponge, and
identifies a discontinuity.
1.1.2 Test Method B—High Voltage Spark Testers.
3.1.3 holiday detector, as used in this standard, n—a device
1.2 This practice addresses metallic substrates. For concrete
that locates discontinuities in a nonconductive coating film
surfaces, refer to Practice D4787.
applied to an electrically conductive surface.
1.3 The values stated in SI units are to be regarded as the
3.1.4 pinhole, as used in this standard, n—a film defect
standard. The values given in parentheses are for information
characterized by small pore like flaws in the coating which,
only.
when extended entirely through the film, will appear as a
1.4 This standard does not purport to address all of the
discontinuity. A pinhole in the finish coat may not appear as a
safety concerns, if any, associated with its use. It is the
discontinuity.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 4. Significance and Use
bility of regulatory limitations prior to use.
4.1 A coating is applied to a metallic substrate to prevent
corrosion, reduce abrasion or reduce product contamination, or
2. Referenced Documents
all three. The degree of coating continuity required is dictated
2
2.1 ASTM Standards:
by service conditions. Discontinuities in a coating are fre-
G62 Test Methods for Holiday Detection in Pipeline Coat-
quently very minute and not readily visible. This practice
ings
provides a procedure for electrical detection of minute discon-
D4787 Practice for Continuity Verification of Liquid or
tinuities in nonconductive coating systems.
Sheet Linings Applied to Concrete Substrates
4.2 Electrical testing to determine the presence and number
3
2.2 NACE Standard:
of discontinuities in a coating film is performed on a noncon-
RP0188–88 Discontinuity (Holiday) Testing of Protective
ductive coating applied to an electrically conductive surface.
Coatings
The allowable number of discontinuities should be determined
prior to conducting this test since the acceptable quantity of
3. Terminology
discontinuities will vary depending on coating film thickness,
3.1 Definitions of Terms Specific to This Standard:
design, and service conditions.
3.1.1 discontinuity, as used in this standard, n—a flaw, void,
4.3 The low voltage wet sponge test equipment is generally
crack, thin spot, foreign inclusion, or contamination in the
used for determining the existence of discontinuities in coating
films having a total thickness of 0.5 mm (20 mil) or less. High
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and voltage spark test equipment is generally used for determining
Related Coatings, Materials, and Applications and is the direct responsibility of
the existences of discontinuities in coating films having a total
Subcommittee D01.46 on Industrial Protective Coatings.
thickness of greater than 0.5 mm (20 mil).
CurrenteditionapprovedJune1,2008.PublishedJuly2008.Originallyapproved
in 1991. Last previous edition approved in 2001 as D5162 – 01. DOI: 10.1520/
4.4 Coatings that are applied at a thickness of less than 0.5
D5162-08.
mm (20 mil) may be susceptible to damage if tested with high
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
voltage spark testing equipment. Consult the coating manufac-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
turer for proper test equipment and inspection voltages.
the ASTM website.
3
4.5 To prevent damage to a coating film when using high
Available from NACE International (NACE), 1440 South Creek Dr., Houston,
TX 77084-4906, http://www.nace.org. voltage test instrumentation, total film thickness and dielectric
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D5162 − 08
strengthi
...

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:D5162–01 Designation:D5162–08
Standard Practice for
Discontinuity (Holiday) Testing of Nonconductive Protective
1
Coating on Metallic Substrates
This standard is issued under the fixed designation D 5162; 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 This practice covers procedures for determining discontinuities using two types of test equipment:
1.1.1 Test Method A—Low Voltage Wet Sponge, and
1.1.2 Test Method B—High Voltage Spark Testers.
1.2 This practice addresses metallic substrates. For concrete surfaces, refer to Practice D 4787.
1.3 The values stated in inch-poundSI units are to bere regarded as the standard. The values given in parentheses immediately
following inch-poundthe metric units are for information only.
1.4 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
2.1 ASTM Standards:
2
D4787Practice for Continuity Verification of Liquid or Sheet Linings Applied to Concrete Substrates ASTM Standards:
2
G 62 Test Methods for Holiday Detection in Pipeline Coatings Test Methods for Holiday Detection in Pipeline Coatings
D 4787 Practice for Continuity Verification of Liquid or Sheet Linings Applied to Concrete Substrates
3
2.2 NACE Standard:
RP0188–88 Discontinuity (Holiday) Testing of Protective Coatings
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 discontinuity, as used in this standard, n—a flaw, void, crack, thin spot, foreign inclusion, or contamination in the coating
film that significantly lowers the dielectric strength of the coating film. MayAdiscontinuity may also be identified as a holiday or
pinhole.
3.1.2 holiday, as used in this standard, n— a term that identifies a discontinuity.
3.1.3 holiday detector, as used in this standard, n—a device that locates discontinuities in a nonconductive coating film applied
to an electrically conductive surface.
3.1.4 pinhole, as used in this standard, n— a film defect characterized by small pore like flaws in the coating which, when
extended entirely through the film, will appear as a discontinuity. A pinhole in the finish coat may not appear as a discontinuity.
4. Significance and Use
4.1 Acoating is applied to a metallic substrate to prevent corrosion, reduce abrasion or reduce product contamination, or both.
all three. The degree of coating continuity required is dictated by service conditions. Discontinuities in a coating are frequently
very minute and not readily visible. This practice provides a procedure for electrical detection of minute discontinuities in
nonconductive coating systems.
4.2 Electrical testing to determine the presence and number of discontinuities in a coating film is performed on a nonconductive
coating applied to an electrically conductive surface. The allowable number of discontinuities should be determined prior to
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.46 on Industrial Protective Coatings.
Current edition approved June 10, 2001. Published August 2001. Originally published as D5162–91. Last previous edition D5162–00.
Current edition approved June 1, 2008. Published July 2008. Originally approved in 1991. Last previous edition approved in 2001 as D 5162 – 01.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Note that Test Method G62 establisheds specific values for C (referred to as “M”or“K” depending on thickness) for pipeline coatings.
3
Available from NACE International (NACE), 1440 South Creek Dr., Houston, TX 77084-4906, http://www.nace.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D5162–08
conducting this test since the acceptable quantity of discontinuities will vary depending on coating
...