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ASTM D4787-93(1999)

Historical Revision

Standard Practice for Continuity Verification of Liquid or Sheet Linings Applied to Concrete Substrates

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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.


SDO ASTM: ASTM International
Document Number D4787
Publication Date Jan. 1, 1999
Language en - English
Page Count 4
Revision Level 93(1999)
Supercedes
Committee D01.46
Publish Date Document Id Type View
July 1, 2024 D4787-24 Revision
Feb. 1, 2013 D4787-13 Revision
June 1, 2008 D4787-08 Revision
Jan. 1, 1999 D4787-93R99 Revision
Sept. 1, 2018 D4787-13R18 Reaffirmation