ASTM D4787-93(1999)
Historical Standard: ASTM D4787-93(1999) Standard Practice for Continuity Verification of Liquid or Sheet Linings Applied to Concrete Substrates
SUPERSEDED (see Active link, below)
ASTM D4787
1. Scope
1.1 This practice covers procedures that may be used to allow the detection of discontinuities in nonconductive linings applied to concrete substrates.
1.2 Discontinuities may include pinholes, internal voids, holidays, cracks, and conductive inclusions.
1.3 This practice describes detection of discontinuities utilizing a low voltage wet sponge holiday detector and a high voltage pulsating or continuous dc spark tester. Linings with thickness in excess of 20 mils must be tested utilizing high voltage spark testing equipment.
Note-For further information on discontinuity testing refer to NACE Standard RP0188-88 or Practice D5162.1.4 This practice describes procedures both with and without the use of a conductive underlayment.
1.5 The values stated in the inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 This standard does not purport to address all of the safety problems, 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. For a specific hazard statement, see Section 7.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D5162 Practice for Discontinuity (Holiday) Testing of Nonconductive Protective Coating on Metallic Substrates
G62 Test Methods for Holiday Detection in Pipeline Coatings
Keywords
conductive underlayment; conductivity; discontinuities; high voltage spark testers; low voltage wet sponge testers;
ICS Code
ICS Number Code 91.100.30 (Concrete and concrete products)
DOI: 10.1520/D4787-93R99
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