Designation:A707/A707M–02AnAmericanNationalStardardStandardSpecificationforForgedCarbonandAlloySteelFlangesforLow-TemperatureService1ThisstandardisissuedunderthefixeddesignationA707/A707M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoversforgedcarbonandalloysteelflangesintendedprimarilyforpetroleumandgaspipelinesinareassubjecttolowambienttemperatures.IncludedareflangestospecifieddimensionsortodimensionalstandardssuchasthoseMSS,ASME,andAPIspecificationsthatarereferencedinSection2.1.2Supplementaryrequirementsareprovidedforusewhenadditionalrequirementsaredesired.Theseshallapplyonlywhenspecifiedindividuallybythepurchaserintheorder.1.3Eightgrades,fouryield-strengthclasses,andthreedifferentnotchtoughnesslevelsareincluded.1.4Theavailabilityofaparticularsizeofflangeofaspecificgradeandclassislimitedonlybythecapabilityofthecompositiontomeetthespecifiedmechanicalpropertyrequire-ments.However,currentpracticenormallylimitsthefollow-ing:(a)GradeL1toClasses1and2,(b)GradeL2toClasses1,2,and3,(c)GradeL3toClasses1,2,and3,(d)GradeL4toClasses1,2,and3,(e)GradeL7toClasses1and2,and(f)GradesL5,L6,andL8aregenerallyavailableinanyclass.1.5Thisspecificationisexpressedinbothinch-poundunitsandinSIunits.However,unlesstheorderspecifiestheapplicable“M”specificationdesignation(SIunits),themate-rialshallbefurnishedtoinch-poundunits.1.6Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecifi-cation.2.ReferencedDocuments2.1InadditiontothosereferencedocumentslistedinSpecificationA961,thefollowinglistofstandardsapplytothiss...
