ASTM_D_3681_-_12e1.pdf

Designation:D3681121An American National StandardStandard Test Method forChemical Resistance of“Fiberglass”(GlassFiberReinforced Thermosetting-Resin)Pipe in aDeflected Condition1This standard is issued under the fixed designation D3681;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.1NOTEEditorially corrected Table A1.2 in March 2014.1.Scope*1.1 This test method covers the procedure for determiningthe chemical-resistant properties of fiberglass pipe in a de-flected condition for diameters 4 in.(102 mm)and larger.Bothglassfiberreinforced thermosetting resin pipe(RTRP)andglassfiberreinforced polymer mortar pipe(RPMP)are fiber-glass pipes.NOTE1For the purposes for this standard,polymer does not includenatural polymers.1.2 Inch-pound units are to be regarded as the standard.Thevalues given in parentheses are for information only.1.3 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.Specific precau-tionary statements are given in 9.5.NOTE2There is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD3567 Practice for Determining Dimensions of“Fiberglass”(Glass-Fiber-Reinforced Thermosetting Resin)Pipe andFittings2.2 ISO Standard:3 Preferred NumbersSeries of Preferred Numbers33.Terminology3.1 Definitions:3.1.1 GeneralDefinitions are in accordance with Termi-nology D883 and abbreviations are in accordance with Termi-nology D1600 unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 end pointthe passage of the fluid through the pipewall unless otherwise stated.The failure mode may becatastrophic,characterized by a sudden fracture through thepipe wall in the area of greatest strain,parallel to the axis of thepipe,with the fiber reinforcement cleanly broken at the edge ofthe fracture.Visual evidence of surface etching or pitting mayor may not be present.3.2.2 fiberglass pipetubular product containing glass fiberreinforcements embedded in or surrounded by cured thermo-setting resin.The composite structure may contain aggregate,granular or platelet fillers,thixotropic agents,pigments,ordyes.Thermoplastic or thermosetting liners or coatings may beincluded.3.2.3 reinforced polymer mortar pipe(RPMP)fiberglasspipe with aggregate.3.2.4 reinforcedthermosettingresinpipe(RTRP)fiberglass pipe without aggregate.3.2.5 strain-corrosionthe failure of the pipe wall causedby the exposure of the inside surface,while in a strainedcondition,to a corrosive environment for a period of time.4.Summary of Test Method4.1 This test method consists of exposing the interior of aminimum of 18 specimens of pipe to a corrosive test solutionwhile the pipe is constantly maintained in a deflected conditionat differing induced initial ring flexural strain levels,and1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.23 on Reinforced PlasticPiping Systems and Chemical Equipment.Current edition approved April 1,2012.Published May 2012.Originallyapproved in 1978.Last previous edition approved in 2006 as D3681 06.DOI:10.1520/D3681-12E01.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 measuring the time to failure for each strain level.Testtemperatures are obtained by testing in an air environmentwhere the temperature is controlled.4.2 The long-term resistance of the pipe to the test solutionis obtained by an extrapolation to 50 years of a log-log linearregression line for initial strain level versus time.NOTE3It is the consensus of Subcommittee D20.23 that the logloglinear regression analysis of test data is a conservative approach and isrepresentative of standard industry practice.However,a task group hasbeen formed to evaluate alternative non-linear analysis methods.5.Significance and Use5.1 This test method evaluates the effect of a chemicalenvironment on pipe when in a deflected condition.It has beenfound that effects of chemical environments can be acceleratedby strain induced by def