ASTM D7982-15(2021)
(Practice)Standard Practice for Testing of Factory Thermo-Fusion Seams for Fabricated Geomembrane Panels
Standard Practice for Testing of Factory Thermo-Fusion Seams for Fabricated Geomembrane Panels
SIGNIFICANCE AND USE
4.1 This practice is intended to aid fabricators, suppliers, purchasers, and users of fabricated panels in the testing requirements for factory-created seams during fabrication of geomembrane panels.
4.2 Factory seaming of geomembranes has advantages over field seaming including less temperature variation, no wind, fewer contamination (soil and water) concerns, a consistent work surface for welding, and options for factory equipment that may not be robust enough for the field environment. This results in factory welds more consistent than field seams and allows for a lesser frequency of testing than for field seams.
4.3 This guide is not intended to replace project-specific seaming and testing requirements or quality assurance programs.
SCOPE
1.1 This practice provides manufacturing quality control guidance for the factory seaming of fabricated geomembrane panels. This practice is not to be considered as all-encompassing since there are a large number of geomembrane types, weld types, and fabrication processes that cannot be anticipated and covered in this document.
1.2 This practice is written for factory-fabricated geomembrane panels only and does not apply to field fabrication onsite.
1.3 This practice does not cover joining of materials during the primary geomembrane manufacturing process such as the vulcanized overlaps found in EPDM sheet.
1.4 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.
1.5 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.
General Information
Relations
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: D7982 − 15 (Reapproved 2021)
Standard Practice for
Testing of Factory Thermo-Fusion Seams for Fabricated
Geomembrane Panels
This standard is issued under the fixed designation D7982; 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 D7700 Guide for Selecting Test Methods for Geomembrane
Seams
1.1 This practice provides manufacturing quality control
D7747/D7747M Test Method for Determining Integrity of
guidance for the factory seaming of fabricated geomembrane
Seams Produced Using Thermo-Fusion Methods for Re-
panels. This practice is not to be considered as all-
inforced Geomembranes by the Strip Tensile Method
encompassing since there are a large number of geomembrane
D7749 Test Method for Determining Integrity of Seams
types, weld types, and fabrication processes that cannot be
Produced Using Thermo-Fusion Methods for Reinforced
anticipated and covered in this document.
Geomembranes by the Grab Method
1.2 This practice is written for factory-fabricated geomem-
D7865 Guide for Identification, Packaging, Handling, Stor-
brane panels only and does not apply to field fabrication onsite.
age and Deployment of Fabricated Geomembrane Panels
1.3 This practice does not cover joining of materials during
3. Terminology
the primary geomembrane manufacturing process such as the
vulcanized overlaps found in EPDM sheet.
3.1 For definitions of terms related to geomembranes, refer
to Terminology D4439.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.2 Definitions:
responsibility of the user of this standard to establish appro-
3.2.1 destructive test sample—a seam sample taken before,
priate safety, health, and environmental practices and deter-
during, or after production welding that is used to determine
mine the applicability of regulatory limitations prior to use.
compliance of production seams with a specification.
1.5 This international standard was developed in accor-
3.2.2 post-production test—a destructive test sample tested
dance with internationally recognized principles on standard-
at the conclusion of the manufacturing process (production
ization established in the Decision on Principles for the
seam or trial seam) to qualify the previously produced produc-
Development of International Standards, Guides and Recom-
tion seams.
mendations issued by the World Trade Organization Technical
3.2.3 pre-production test—adestructivetestsampletestedat
Barriers to Trade (TBT) Committee.
the beginning of the manufacturing process to qualify subse-
quent production seams.
2. Referenced Documents
2 3.2.4 production seam—a factory seam that is made as part
2.1 ASTM Standards:
of a finished fabricated panel.
D4439 Terminology for Geosynthetics
3.2.5 trial seam—a seam made prior to or after production
D6392 Test Method for Determining the Integrity of Nonre-
welding, made by the same personnel, using the same
inforced Geomembrane Seams Produced Using Thermo-
geomembrane material, the same welding unit, and the same
Fusion Methods
D7408 Specification for Non-Reinforced PVC (Polyvinyl seaming conditions used in the actual production seaming
process. Trial seams are used to provide destructive test
Chloride) Geomembrane Seams
samples without damaging production seams.
3.2.6 welding unit—each individual welding station or piece
This practice is under the jurisdiction of ASTM Committee D35 on Geosyn-
of welding equipment used to make a single seam.
thetics and is the direct responsibility of Subcommittee D35.10 on Geomembranes.
Current edition approved July 1, 2021. Published July 2021. Originally approved
4. Significance and Use
in 2015. Last previous edition approved in 2015 as D7982 – 15. DOI: 10.1520/
D7982-15R21.
4.1 This practice is intended to aid fabricators, suppliers,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
purchasers, and users of fabricated panels in the testing
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
requirements for factory-created seams during fabrication of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. geomembrane panels.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7982 − 15 (2021)
4.2 Factory seaming of geomembranes has advantages over 5.2.2 Sometypesofseamsdonothavealooseflapavailable
field seaming including less temperature variation, no wind, for testing seam peel strength. If a trial seam cannot easily be
fewer contamination (soil and water) concerns, a consistent madeforevaluationofseampeelstrength,theproductionseam
work surface for welding, and options for factory equipment can have a tape or some other means of interrupting the
that may not be robust enough for the field environment. This bonding of the two sheets so that two seam peel specimens can
results in factory welds more consistent than field seams and be cut and tested down the length of the seam. In that case, two
allows for a lesser frequency of testing than for field seams. test specimens are sufficient for evaluation seam peel strength.
This is typically done on extra material at the beginning or end
4.3 This guide is not intended to replace project-specific
of a seam and not from the middle of a production seam.
seaming and testing requirements or quality assurance pro-
5.2
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