ASTM_D_7982_-_15.pdf

Designation:D798215Standard Practice forTesting of Factory Thermo-Fusion Seams for FabricatedGeomembrane Panels1This standard is issued under the fixed designation D7982;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice provides manufacturing quality controlguidance for the factory seaming of fabricated geomembranepanels.This practice is not to be considered as all-encompassing since there are a large number of geomembranetypes,weld types and fabrication processes that cannot beanticipated and covered in this document.1.2 This practice is written for factory fabricated geomem-brane panels only and does not apply to field fabricationon-site.1.3 This practice does not cover joining of materials duringthe primary geomembrane manufacturing process such as thevulcanized overlaps found in EPDM sheet.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D4439 Terminology for GeosyntheticsD6392 Test Method for Determining the Integrity of Nonre-inforced Geomembrane Seams Produced Using Thermo-Fusion MethodsD7408 Specification for Non Reinforced PVC(PolyvinylChloride)Geomembrane SeamsD7700 Guide for Selecting Test Methods for GeomembraneSeamsD7747 Test Method for Determining Integrity of SeamsProduced Using Thermo-Fusion Methods for ReinforcedGeomembranes by the Strip Tensile MethodD7749 Test Method for Determining Integrity of SeamsProduced Using Thermo-Fusion Methods for ReinforcedGeomembranes by the Grab MethodD7865 Guide for Identification,Packaging,Handling,Stor-age and Deployment of Fabricated Geomembrane Panels3.Terminology3.1 For definition of terms related to geomembranes,refer toTerminology D4439.3.2 Definitions:3.2.1 destructive test samplea seam sample taken before,during or after production welding that is used to determinecompliance of production seams with a specification.3.2.2 post-production testa destructive test sample testedat the conclusion of the manufacturing process(productionseam or trial seam)to qualify the previously produced produc-tion seams.3.2.3 pre-production testa destructive test sample tested atthe beginning of the manufacturing process to qualify subse-quent production seams.3.2.4 production seama factory seam that is made as partof a finished fabricated panel.3.2.5 trial seama seam made prior to or after productionwelding,made by the same personnel,using the samegeomembrane material,the same welding unit and the sameseaming conditions used in the actual production seamingprocess.Trial seams are used to provide destructive testsamples without damaging production seams.3.2.6 welding uniteach individual welding station or pieceof welding equipment used to make a single seam.4.Significance and Use4.1 This practice is intended to aid fabricators,suppliers,purchasers,and users of fabricated panels in the testingrequirements for factory created seams during fabrication ofgeomembrane panels.4.2 Factory seaming of geomembranes has advantages overfield seaming including less temperature variation,no wind,less contamination(soil and water)concerns,a consistent worksurface for welding and options for factory equipment that maynot be robust enough for the field environment.This results in1This practice is under the jurisdiction of ASTM Committee D35 on Geosyn-thetics and is the direct responsibility of Subcommittee D35.10 on Geomembranes.Current edition approved Jan.1,2015.Published January 2015.DOI:10.1520/D7982152For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 factory welds more consistent than field seams and allows fora lesser frequency of testing than for field seams.4.3 This guide is not intended to replace project-specificseaming and testing requirements or quality assurance pro-grams.5.Procedure5.1 Factory Seam Testing Frequency:5.1.1 The quality of production seams must be verified bydestructively testing portions of production seams or test seamsfrom each welding unit used at a frequency that is sufficient toprovide confidence in the seam quality contained in the factoryfabricated panels.To that end,all production seaming must bebounded by passing destructive test samples consisting of,at aminimum,a pre-production test and a post-production test.Adestructive test sa