ASTM D7982-15(R2021) pdf free download

ASTM D7982-15(R2021) pdf free download.Standard Practice for Testing of Factory Thermo-Fusion Seams for Fabricated Geomembrane Panels
1. 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 geomem- brane 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 For definitions of terms related to geomembranes, refer to Terminology D4439. 3.2 Definitions: 3.2.1 destructive test sample—a seam sample taken before, during, or after production welding that is used to determine compliance of production seams with a specification. 3.2.2 post-production test—a destructive test sample tested at the conclusion of the manufacturing process (production seam or trial seam) to qualify the previously produced produc- tion seams. 3.2.3 pre-production test—a destructive test sample tested at the beginning of the manufacturing process to qualify subse- quent production seams. 3.2.4 production seam—a factory seam that is made as part of a finished fabricated panel. 3.2.5 trial seam—a seam made prior to or after production welding, made by the same personnel, using the same geomembrane material, the same welding unit, and the same seaming conditions used in the actual production seaming process. Trial seams are used to provide destructive test samples without damaging production seams. 3.2.6 welding unit—each individual welding station or piece of welding equipment used to make a single seam.
4. 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 pro- grams.
5. Procedure
5.1 Factory Seam Testing Frequency: 5.1.1 The quality of production seams must be verified by destructively testing portions ofproduction seams or test seams from each welding unit used at a frequency that is sufficient to provide confidence in the seam quality contained in the factory-fabricated panels. To that end, all production seaming must be bounded by passing destructive test samples consisting of, at a minimum, a pre-production test and a post-production test. A destructive test sample tested during production process qualifies as a post-production test for the seams already made, as well as a pre-production test for the seams to be made going forward. 5.1.2 Destructive test samples can be taken from production seams as part of in-process inspections. Destructive test samples can be removed from extra material added to the end of a production seam or from a cut-out within a production seam. Any discontinuity in the production seam as a result of sample removal must be repaired. 5.1.3 Pre-production tests must be completed at the begin- ning of a shift, after any break in the seaming process that is 45 min or longer, after any change in the welding unit settings, and any time the type or thickness of geomembrane being seamed is changed.