Designation:B366/B366M−19StandardSpecificationforFactory-MadeWroughtNickelandNickelAlloyFittings1ThisstandardisissuedunderthefixeddesignationB366/B366M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoverswroughtweldingfittingsforpressurepiping,factory-madefromnickelandnickelalloys.ThreadedfittingsascoveredinASMEB16.11arealsocoveredbythisspecification.Thetermweldingappliestobutt-weldingorsocket-weldingpartssuchas45and90°elbows,180°bends,caps,tees,reducers,lap-jointstubends,andothertypes,ascoveredbyASMEB16.9,ASMEB16.11,MSSSP-43,MSSSP-95,andMSSSP-97.1.1.1Severalgradesofnickelandnickelalloysareincludedinthisspecification.Gradesaredesignatedwithaprefix,WPorCR,basedontheapplicableASMEorMSSdimensionalandratingstandards.1.1.2ClassWPfittingsarethosemanufacturedtotherequirementsofASMEB16.9,B16.11.1.1.3ForeachoftheWPnickelandnickelalloygrades,severalclassesoffittingsarecoveredtoindicatewhetherseamlessorweldedconstructionwasutilized.Classdesigna-tionsarealsoutilizedtoindicatethenondestructivetestmethodandextentofnondestructiveexamination(NDE).Table1isgeneralsummaryofthefittingclassesapplicabletoallWPgradesofnickelandnickelalloyscoveredbythisspecification.TherearenoclassesfortheCRgrades.Specificrequirementsarecoveredelsewhere.1.2Thisspecificationdoesnotapplytocastweldingfit-tings.1.3Optionalsupplementaryrequirementsareprovidedforfittingswhereagreaterdegreeofexaminationisdesired.Thesesupplementaryrequirementscallforadditionaltests.Whendesired,oneormoreofthesemaybespecifiedintheorder.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththesta...
