ASTM C536-83(2023)

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: C536 − 83 (Reapproved 2023)
Standard Test Method for
Continuity of Coatings in Glassed Steel Equipment by
Electrical Testing
This standard is issued under the fixed designation C536; 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.
INTRODUCTION
This procedure is a high-voltage discharge test used to locate defects in glass-lined tanks by
grounding the base metal of the test specimen and brushing the test specimen with a probe connected
to the high-voltage side of the test instrument. If a discontinuity exists, a spark will discharge through
the defect to the ground provided by the metal.
1. Scope 2. Referenced Document
2.1 ASTM Standards:
1.1 This test method covers the detection of discontinuities
C537 Test Method for Reliability of Glass Coatings on
in the glass coating of glassed steel equipment where such
Glassed Steel Reaction Equipment by High Voltage
discontinuities would result in early failure due to the attack of
the chemical contents of the vessel on the metal substrate. It is
3. Summary of Test Method
applicable to (1) provide a manufacturing and inspection test of
3.1 The test method consists essentially of grounding the
glassed-steel equipment designed for relatively mild, low-
metal structure of the equipment being tested to the ground side
temperature corrosive service, and (2) the field testing of
of a voltage generator and sweeping the surface of the glass
similar equipment used in more severely corrosive environ-
with a suitable probe electrically connected to the other side of
ment.
the generator. Wherever a discontinuity exists, a discharge will
give a positive indication that such a discontinuity exists. The
NOTE 1—A manufacturing test method for the latter type of equipment
is described in Test Method C537. voltage is set at 5000 V in order to show existing discontinui-
ties without breaking through the existing glass coating. A
1.2 The values stated in SI units are to be regarded as
built-in current limiting device ensures electrical safety for the
standard. No other units of measurement are included in this
operator.
standard.
4. Significance and Use
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4.1 This test method is designed to detect existing discon-
responsibility of the user of this standard to establish appro-
tinuities in the glass coating of glassed steel equipment while
priate safety, health, and environmental practices and deter- maintaining a voltage low enough as to be unlikely to cause
mine the applicability of regulatory limitations prior to use. breakdown of the coating. The test is adaptable for manufac-
turing inspection in the processing of equipment and for field
1.4 This international standard was developed in accor-
use to find existing defects which can be “plugged” or repaired
dance with internationally recognized principles on standard-
before serious damage is done to the equipment. As a means of
ization established in the Decision on Principles for the
positive detection, it is applicable to process studies, quality
Development of International Standards, Guides and Recom-
control, or specification.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5. Definition
5.1 glassed steel (glass-lined steel or glass-coated steel)—
designations generally applied to a class of porcelain enamels
This test method is under the jurisdiction of ASTM Committee B08 on Metallic
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.12 on
Materials for Porcelain Enamel and Ceramic-Metal Systems. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 1, 2023. Published June 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1964. Last previous edition approved in 2018 as C536 – 83 (2018). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/C0536-83R23. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C536 − 83 (2023)
FIG. 1 Circuit Diagram, 5000 V ac Tester
that have high resistance to chemical attack at elevated 9. Procedure
temperatures and pressures.
9.1 Using a 14 gauge (1.63 mm) (or heavier) wire, connect
the ground connection of the tester to the cleaned metal
6. Interferences
substrate o
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