ASTM C536-83(2009)
(Test Method)Standard Test Method for Continuity of Coatings in Glassed Steel Equipment by Electrical Testing
Standard Test Method for Continuity of Coatings in Glassed Steel Equipment by Electrical Testing
SIGNIFICANCE AND USE
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 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.
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 C 537.
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.
General Information
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C536 − 83 (Reapproved 2009)
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.
1. Scope give a positive indication that such a discontinuity exists. The
voltage is set at 5000 V in order to show existing discontinui-
1.1 This test method covers the detection of discontinuities
ties without breaking through the existing glass coating. A
in the glass coating of glassed steel equipment where such
built-in current limiting device ensures electrical safety for the
discontinuities would result in early failure due to the attack of
operator.
the chemical contents of the vessel on the metal substrate. It is
applicable to ( 1) provide a manufacturing and inspection test
4. Significance and Use
of glassed-steel equipment designed for relatively mild, low-
4.1 This test method is designed to detect existing discon-
temperature corrosive service, and (2) the field testing of
tinuities in the glass coating of glassed steel equipment while
similar equipment used in more severely corrosive environ-
maintaining a voltage low enough as to be unlikely to cause
ment.
breakdown of the coating. The test is adaptable for manufac-
NOTE 1—Amanufacturing test method for the latter type of equipment
turing inspection in the processing of equipment and for field
is described in Test Method C537.
use to find existing defects which can be “plugged” or repaired
1.2 The values stated in SI units are to be regarded as
before serious damage is done to the equipment.As a means of
standard. No other units of measurement are included in this
positive detection, it is applicable to process studies, quality
standard.
control, or specification.
1.3 This standard does not purport to address all of the
5. Definition
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5.1 glassed steel (glass-lined steel or glass-coated steel)—
priate safety and health practices and determine the applica- designations generally applied to a class of porcelain enamels
bility of regulatory limitations prior to use. that have high resistance to chemical attack at elevated
temperatures and pressures.
2. Referenced Document
6. Interferences
2.1 ASTM Standards:
C537 Test Method for Reliability of Glass Coatings on
6.1 Sincethetestmethodiselectrical,itisnecessarytohave
Glassed Steel Reaction Equipment by High Voltage
a good ground connection between the instrument and the
metal substrate of the equipment being tested. It is also
3. Summary of Test Method
necessary that the surfaces of the glass be reasonably clean and
3.1 The test method consists essentially of grounding the dry.Awet surface will conduct enough voltage to any exposed
metalstructureoftheequipmentbeingtestedtothegroundside metal to give an indication of a “contact” over a large area
of a voltage generator and sweeping the surface of the glass insteadofataspecificareaofdiscontinuity.Suchacapacitance
with a suitable probe electrically connected to the other side of discharge can be distinguished from a true failure by extending
the generator. Wherever a discontinuity exists, a discharge will over a large area instead of at local spots that could be
identified and marked for repair.
This test method is under the jurisdiction ofASTM Committee B08 on Metallic
7. Apparatus
and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.12 on
Materials for Porcelain Enamel and Ceramic-Metal Systems.
7.1 The test apparatus comprises a voltage stabilizing
Current edition approved April 15, 2009. Published June 2009. Originally
transformer, a step-up transformer, a current-limiting
´1
approved in 1964. Last previous edition approved in 2004 as C536 – 83 (2004) .
resistance, a voltmeter and pilot light, along with a suitably
DOI: 10.1520/C0536-83R09.
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 When requesting information, specific reference shoul
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.