Designation:D6700−19StandardGuideforUseofScrapTiresasTire-DerivedFuel1ThisstandardisissuedunderthefixeddesignationD6700;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversandprovidesguidanceforthemate-rialrecoveryofscraptiresfortheirfuelvalue.Theconversionofawholescraptireintoachippedformedforuseasafuelproducesaproductcalledtire-derivedfuel(TDF).Thisrecov-eryguidehasmovedfromapioneeringconceptintheearly1980stoaprovenandcontinuoususeintheUnitedStateswithindustrialandutilityapplications.1.2Combustionunitsengineeredtousesolidfuels,suchascoalorwood,orboth,arefairlynumerousthroughouttheU.S.ManyoftheseunitsarenowusingTDFeventhoughtheywerenotspecificallydesignedtoburnTDF.ItisclearthatTDFhascombustioncharacteristicssimilartoothercarbon-basedsolidfuels.Similaritiesledtopragmatictestinginexistingcombus-tionunits.SuccessfultestingledtosubsequentacceptanceofTDFasasupplementalfuelwhenblendedwithconventionalfuelsinexistingcombustiondevices.ChangesrequiredtomodifyappropriateexistingcombustionunitstoaccommodateTDFrangefromnonetorelativelyminor.Theissuesofproperapplicationsandspecificationsarecriticaltosuccessfulutili-zationofthisalternativeenergyresource.1.3ThisguideexplainsTDF’susewhenblendedandcombustedundernormaloperatingconditionswithoriginallyspecifiedfuels.Whole-tirecombustionforenergyrecoveryisnotdiscussedherein,sincewhole-tireusagedoesnotrequiretireprocessingtoadefinedfuelspecification.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenviron...
