Designation:F1120−87(Reapproved2015)AnAmericanNationalStandardStandardSpecificationforCircularMetallicBellowsTypeExpansionJointsforPipingApplications1ThisstandardisissuedunderthefixeddesignationF1120;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationestablishestheminimumrequire-mentsforthemechanicaldesign,manufacture,inspection,andtestingofcircularmetallicbellows-typeexpansionjointsusedtoabsorbthedimensionalchangesresultingfrompipingthermalexpansionorcontraction,aswellasthemovementofterminalequipmentandsupportingstructures.1.2Additionalorbetterfeatures,overandabovethemini-mumrequirementssetbythisspecification,arenotprohibitedbythisspecification.1.3Thelayoutofmanypipingsystemsprovidesinherentflexibilitythroughnaturalchangesindirectionsothatanydisplacementsproduceprimarilybendingortorsionalstrains,withinacceptablelimits.Wherethesystemlacksthisinherentflexibilitythedesignershouldthenconsideraddingflexibilitythroughtheuseofmetallicbellows-typeexpansionjoints.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.2.ReferencedDocuments2.1ANSIStandards:2ANSIB16.5PipeFlangesandFlangedFittingsB16.25ButtWeldingEndsANSIB31.1PowerPipingCode2.2ASMEStandards:3SectionVIII,Division1PressureVesselsSectionIXWeldingandBrazingQualifications2.3EJMAStandard:4StandardsoftheExpansionJointManufacturer’sAssocia-tion2.4PFIStandard:5ES-3FabricationTolerances3.TerminologyDefinitions3.1ExpansionjointdefinitionsshallbeinaccordancewiththoseintheEJMAStandards.3.2doubleexpansionjoint—expansionjointconsistingoftwobellowsjoinedbyacommonconnector.3.2.1Discussion—Thecommonconnectorisanchoredtosomerigidpartoftheinstallationbymeansofananchorb...
