ASTM C536-83(2014)e1

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of the standard as published by ASTM is to be considered the official document.
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Designation: C536 − 83 (Reapproved 2009) C536 − 83 (Reapproved 2014)
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.
ε NOTE—Introduction added and units abbreviations corrected editorially in June 2014.
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
1.1 This test method covers the detection of discontinuities in the glass coating of glassed steel equipment where such
discontinuities would result in early failure due to the attack of the chemical contents of the vessel on the metal substrate. It is
applicable to ( 1) provide a manufacturing and inspection test of glassed-steel equipment designed for relatively mild,
low-temperature corrosive service, and (2) the field testing of similar equipment used in more severely corrosive environment.
NOTE 1—A manufacturing test method for the latter type of equipment is described in Test Method C537.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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 Document
2.1 ASTM Standards:
C537 Test Method for Reliability of Glass Coatings on Glassed Steel Reaction Equipment by High Voltage
3. Summary of Test Method
3.1 The test method consists essentially of grounding the metal structure of the equipment being tested to the ground side of
a voltage generator and sweeping the surface of the glass with a suitable probe electrically connected to the other side of the
generator. Wherever a discontinuity exists, a discharge will give a positive indication that such a discontinuity exists. The voltage
is set at 5000 V in order to show existing discontinuities without breaking through the existing glass coating. A built-in current
limiting device ensures electrical safety for the operator.
4. Significance and Use
4.1 This test method is designed to detect existing discontinuities in the glass coating of glassed steel equipment while
maintaining a voltage low enough as to be unlikely to cause breakdown of the coating. The test is adaptable for manufacturing
This test method is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.12 on
Materials for Porcelain Enamel and Ceramic-Metal Systems.
Current edition approved April 15, 2009May 1, 2014. Published June 2009June 2014. Originally approved in 1964. Last previous edition approved in 20042009 as
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C536 – 83 (2004)(2009). . DOI: 10.1520/C0536-83R09.10.1520/C0536-83R14E1.
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volume information, refer to the standard’s Document Summary page on the ASTM website.
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C536 − 83 (2014)
FIG. 1 Circuit Diagram, 5000 V A-Cac Tester
inspection in the processing of equipment and for field use to find existing defects which can be “plugged” or repaired before
serious damage is done to the equipment. As a means of positive detection, it is applicable to process studies, quality control, or
specification.
5. Definition
5.1 glassed steel (glass-lined steel or glass-coated steel)—designations generally applied to a class of porcelain enamels that
have high resistance to chemical attack at elevated temperatures and pressures.
6. Interferences
6.1 Since the test method is electrical, it is necessary to have a good ground connection between the instrument and the metal
substrate of the equipment bei
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