ASTM_D5162高压电火花测试

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ASTMD5162高压电火花测试1.1 This practice covers procedures for determining discon-
tinuities using two types of test equipment:
1.1.1Test Method A-Low Voltage Wet Sponge， and
1.1.2Test Method B-High Voltage Spark Testers.
1.2 This practice addresses metallic substrates. For concrete
surfaces， refer to Practice D 4787.
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1.3 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses immediately
following inch-pound units are for information only.
1.4This 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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
2.1ASTM Standards:
D 4787 Practice for Continuity Verification of Liquid or
Sheet Linings Applied to Concrete Substrates
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G 62 Test Methods for Holiday Detection in Pipeline Coat-
ings
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3. Terminology
3.1Definitions of Terms Specific to This Standard:
3.1.1discontinuity， as used in this standard- a void， crack，
thin spot， foreign inclusion， or contamination in the coating
film that significantly lowers the dielectric strength of the
coating film. May also be identified as a holiday or pinhole.
3.1.2holiday， as used in this standard-a term that identi-
fies a discontinuity.
3.1.3holiday detector， as used in this standard- a device
that locates discontinuities in a nonconductive coating film
applied to a conductive surface.
3.1.4pinhole， as used in this standard-a film defect
characterized by small porelike flaws in the coating which，
when extended entirely through the film， will appear as a