ASTM D7240-18
(Practice)Standard Practice for Electrical Leak Location Using Geomembranes with an Insulating Layer in Intimate Contact with a Conductive Layer via Electrical Capacitance Technique (Conductive-Backed Geomembrane Spark Test)
Standard Practice for Electrical Leak Location Using Geomembranes with an Insulating Layer in Intimate Contact with a Conductive Layer via Electrical Capacitance Technique (Conductive-Backed Geomembrane Spark Test)
SIGNIFICANCE AND USE
4.1 Geomembranes are used as barriers to prevent liquids from leaking from landfills, ponds, and other containments. For this purpose, it is desirable that the geomembrane have as little leakage as practical.
4.2 The liquids may contain contaminants which, if released, can cause damage to the environment. Leaking liquids can erode the subgrade, causing further damage. Leakage can result in product loss or otherwise prevent the installation from performing its intended containment purpose.
4.3 Geomembranes are often assembled in the field, either by unrolling and welding panels of the geomembrane material together in the field, unfolding flexible geomembranes in the field, or a combination of both.
4.4 Geomembrane leaks can be caused by poor quality of the subgrade, poor quality of the material placed on the geomembrane, accidents, poor workmanship, manufacturing defects, and carelessness.
4.5 Electrical leak location methods are an effective and proven quality assurance measure to detect and locate leaks.
SCOPE
1.1 This practice is a performance-based standard for an electrical method for locating leaks in exposed conductive-backed geomembranes. For clarity, this practice uses the term “leak” to mean holes, punctures, tears, knife cuts, seam defects, cracks, and similar breaches in an installed geomembrane (as defined in 3.2.7).
1.2 This practice can be used for conductive-backed geomembranes installed in basins, ponds, tanks, ore and waste pads, landfill cells, landfill caps, canals, and other containment facilities. It is applicable for conductive-backed geomembranes made of materials such as polyethylene, polypropylene, polyvinyl chloride, chlorosulfonated polyethylene, bituminous geomembrane, and any other electrically insulating materials. This practice is best applicable for locating conductive-backed geomembrane leaks where the proper preparations have been made during the construction of the facility.
1.3 For electrical leak location of conductive-backed geomembranes using methods in lieu of or in addition to the spark testing method, the installation must be electrically isolated (as defined in 3.2.5).
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 The spark test may produce an electrical spark and therefore should only be used where an electrical spark would not create a hazard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7240 − 18
Standard Practice for
Electrical Leak Location Using Geomembranes with an
Insulating Layer in Intimate Contact with a Conductive
Layer via Electrical Capacitance Technique (Conductive-
1
Backed Geomembrane Spark Test)
This standard is issued under the fixed designation D7240; 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 1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This practice is a performance-based standard for an
ization established in the Decision on Principles for the
electrical method for locating leaks in exposed conductive-
Development of International Standards, Guides and Recom-
backed geomembranes. For clarity, this practice uses the term
mendations issued by the World Trade Organization Technical
“leak”tomeanholes,punctures,tears,knifecuts,seamdefects,
Barriers to Trade (TBT) Committee.
cracks, and similar breaches in an installed geomembrane (as
defined in 3.2.7).
2. Referenced Documents
2
1.2 This practice can be used for conductive-backed
2.1 ASTM Standards:
geomembranes installed in basins, ponds, tanks, ore and waste
D4439 Terminology for Geosynthetics
pads, landfill cells, landfill caps, canals, and other containment
D5641/D5641M Practice for Geomembrane Seam Evalua-
facilities.Itisapplicableforconductive-backedgeomembranes
tion by Vacuum Chamber
made of materials such as polyethylene, polypropylene, poly-
D5820 Practice for Pressurized Air Channel Evaluation of
vinyl chloride, chlorosulfonated polyethylene, bituminous
Dual Seamed Geomembranes
geomembrane, and any other electrically insulating materials.
D6747 GuideforSelectionofTechniquesforElectricalLeak
This practice is best applicable for locating conductive-backed
Location of Leaks in Geomembranes
geomembrane leaks where the proper preparations have been
3. Terminology
made during the construction of the facility.
3.1 Definitions:
1.3 For electrical leak location of conductive-backed
3.1.1 For general definitions used in this practice, refer to
geomembranes using methods in lieu of or in addition to the
Terminology D4439.
spark testing method, the installation must be electrically
3.2 Definitions of Terms Specific to This Standard:
isolated (as defined in 3.2.5).
3.2.1 conductive-backed geomembrane, n—a specialty
1.4 The values stated in SI units are to be regarded as
geomembrane manufactured using coextrusion technology,
standard. No other units of measurement are included in this
featuring an insulating layer in intimate contact with a conduc-
standard.
tive layer.
1.5 The spark test may produce an electrical spark and
3.2.2 coupling pad, n—an electrically conductive pad
therefore should only be used where an electrical spark would
placed on top of the geomembrane and connected to the spark
not create a hazard. This standard does not purport to address
testing apparatus used to induce electrical potential across the
all of the safety concerns, if any, associated with its use. It is
conductive-backed geomembrane.
the responsibility of the user of this standard to establish
3.2.3 current, n—the flow of electricity or the flow of
appropriate safety, health, and environmental practices and
electric charge.
determine the applicability of regulatory limitations prior to
use. 3.2.4 electrical leak location, n—a method which uses
electrical current or electrical potential to locate leaks in a
geomembrane.
1
This practice is under the jurisdiction of ASTM Committee D35 on Geosyn-
2
thetics and is the direct responsibility of Subcommittee D35.10 on Geomembranes. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Feb. 1, 2018. Published February 2018. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
published in 2006. Last previous edition approved 2011 as D7240 – 06 (2011). DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7240-18. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7240 − 18
3.2.5 electrically isolated conductive-backed geomembrane 4.5 Electrical leak location methods are an effective and
installation, n—an installation of conductive-backed geomem- proven quality assurance measure to detect and lo
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7240 − 06 (Reapproved 2011) D7240 − 18
Standard Practice for
Electrical Leak Location usingUsing Geomembranes with an
Insulating Layer in Intimate Contact with a Conductive
Layer via Electrical Capacitance Technique
1
(Conductive(Conductive-Backed Geomembrane Spark Test)
This standard is issued under the fixed designation D7240; 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
1.1 This standardpractice is a performance-based practice for using the spark test to electrically locate standard for an electrical
method for locating leaks in exposed geomembranes with an insulating layer that are in intimate contact with a conductive layer.
conductive-backed geomembranes. For clarity, this documentpractice uses the term ‘leak’“leak” to mean holes, punctures, tears,
cuts, cracks knife cuts, seam defects, cracks, and similar breaches over the partial or entire area of in an installed geomembrane
(as defined in 3.2.33.2.7).
1.2 This test method practice can be used on exposedfor conductive-backed geomembranes installed in basins, ponds, tanks, ore
and waste pads, landfill cells, landfill caps, canals, and other containment facilities. This standard It is applicable for geomembranes
in direct and intimate contact with a conductive surface or with a conductive layer integrally included.conductive-backed
geomembranes made of materials such as polyethylene, polypropylene, polyvinyl chloride, chlorosulfonated polyethylene,
bituminous geomembrane, and any other electrically insulating materials. This practice is best applicable for locating
conductive-backed geomembrane leaks where the proper preparations have been made during the construction of the facility.
1.3 SAFETY WARNING:For The electrical methods used for geomembrane leak location use high voltage, low current power
supplies, resulting in the potential for electrical shock. The electrical methods used for geomembrane leak location should be
attempted by only qualified and experienced personnel. Appropriate safety measures must be taken to protect the leakelectrical leak
location of conductive-backed geomembranes using methods in lieu of or in addition to the spark testing method, the installation
must be electrically isolated (as defined in 3.2.5location operators as well as other people at the site.).
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 The spark test may produce an electrical spark and therefore should only be used where an electrical spark would not create
a hazard. This standard does not purport to address all of the safety and liability concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and
determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D4439 Terminology for Geosynthetics
D5641/D5641M Practice for Geomembrane Seam Evaluation by Vacuum Chamber
D5820 Practice for Pressurized Air Channel Evaluation of Dual Seamed Geomembranes
D6747 Guide for Selection of Techniques for Electrical Leak Location of Leaks in Geomembranes
1
This practice is under the jurisdiction of ASTM Committee D35 on Geosynthetics and is the direct responsibility of Subcommittee D35.10 on Geomembranes.
Current edition approved June 1, 2011Feb. 1, 2018. Published July 2011February 2018. Originally published in 2006. Last previous edition approved 20062011 as
D7240D7240 – 06 (2011).–06. DOI: 10.1520/D7240-06R11.10.1520/D7240-18.
2
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 the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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