DIN-3021-3-english

April1998HoseclampsSpringBandClamps(SBC)Part3:System:springbandclamp/hose/spigotDIN3021-3ICS21.060.70Hoseclamps-Springbandclamp-Part3:System:Springbandclamp/hose/spigotColliersdeserrage-Colliersderessort-Part3:Systéme:Collierderessort-tuyau-manchonForewordThisstandarddraftwasdrawnupbythestudygroupStandardisationofSpringBandClampsintheStandardsCommitteeIron,SheetandMetalware(NAEBM).DIN3021Hoseclamps-springbandclamps(SBC)comprise:Part1:Dimensions,designation,materialsPart2:TechnicaldeliveryconditionsPart3:System:springbandclamp/hose/spigotAnnexAisforinformation.WarningremarksaboutapplicationThisstandarddraftissubmittedtothepublicforcheckingandcomments.Sincetheintendedstandardmaydifferfromthepresentversion,applicationofthisdraftshallbeagreeduponinaspecialform.PleaserefercommentstoNormenausschussEisen-,Blech-undMetallwaren(NAEBM)inDIN,KaiserswertherStr.135,D-40474Duesseldorf.1FieldofapplicationThisstandardisapplicabletohose/spigotconnectionswithspringbandclampsinaccordancewithDIN3021-1andstipulatesthedimensionsandexecutionofhoseandspigot.2ReferencestostandardsThisstandardcontainsdatedorundatedreferences,aswellasdefinitionsfromotherpublications.Suchreferencestostandardsarequotedinthepertinentpassagesinthetext,andthepublicationsarelistedbelow.Withdatedreferences,subsequentamendmentsorrevisionsofthesepublicationsonlybelongtothisstandardiftheyareincludedbyamendmentsorrevisions.Withundatedreferencesthelatesteditionofthepublicationreferredtoshallbeapplicable.DIN3021-1Hoseclamps-springbandclamps-Part1:Dimensions,marking,materials,types.DIN73411-1Coolantwaterlinesinvehicles;hosesandhoseelbows;Part1:Dimensions,material,designationDIN73379-1Fuelhoses–Part1:Dimensions,material,designationDIN71550CrimpingforhoseconnectionsinpipelinesOtherstandards:DIN73411-2Coolantwaterlinesinvehicles;hosesandhoseelbows;Part2:Requirements,testingDIN73379-2Fuelhoses–Part2:Requirements,testingNormenausschußEisen-,Blech-undMetallwaren(NAEBM)imDINDeutschesInstitutfürNormunge.V.Tobecont.Pages2to6Page2DIN3021-33System:3.1Springbandclamp/hose/spigotCorrectfunctioningofthespringbandclamp/hose/spigotsystemassuredbyseveralcharacteristicsthathavebeenspecificallymatchedtoagreewitheachother:-clampingforcesforthesealingeffectincludinglong-timefunction,-pull-offforcestotakeupdynamicaxialloadsaretobetestedonacasebycasebasis,-geometricaldimensionsforsafeassembling.Minimumrequirementsaremadeonthegeometryofthehosesandspigotstoensureleak-proofnessinthesystem.Toattaintheseminimumrequirements,thedimensions,tolerances,mouldoffset,partingedgeandwavinessofthespigotandhosemustbeco-ordinatedwitheachother.Selectionofthespigotformisdependentonthematerialandproductionprocedureforthespigot.Howtheminimumrequirementsareco-ordinatedisdescribedbelow.3.2Spigotsforhousesaccordancewithtable1DimensionsinmillimetresThespigotsneednotfallinlinewiththepictorialrepresentation,onlythedimensionsspecifiedhavingtobemaintainedFormA3)(idealform)Figure1:Cutmetalspigotsandplasticinjection-mouldedspigotsAnexampleofhowaspigotFormAwithspigotdiameterds=20mmisenteredonadrawing:SpigotDIN3021-A20DesignationMainstandardnumberFormSpigotdiameterdsseePage4forfootnotesZZLmin1)ødw2)ødsR1-0,5f15°±3°AøxR0,5±0,25Page3DIN3021-3FormB3)4)Figure2:PlasticspigotFormC3)5)Figure3:Spigotformforbeadsonpipelines(similartoDIN71550)3.3SpigotforfuelsystemsFormD3)23min.6)A4,6±0,212,8±0,29,3±0,25,8±0,2ø8,0+0,2ø8,8+0,2BAø0,1Bø0,2Aø0,1R1,2±0,215°±1°øø9,0+0,2R0,5±0,2Figure4:Onlyforhoseswithdi=7,3±0,2;p=3,5±0,3andclampDIN3021-B-14x12seePage4forfootnotesZ15°±3°Lmin1)ødsfAødw2)AøxZR2,5-0,5R0,5±0,25ZLmin1)fødsAødw2)AøxR2,5-0,5R0,5+0,5ZPage4DIN3021-33.3HoseThehosedimensionsspecifiedinTable1correspondtoDIN73411-1(Table1)andDIN73379-1(Table1)3.3.1MinimumhoserequirementsmoothappliestobothendsofthehoseFigure5:Illustration-hose1)InthisareaforformsA,BandC:-Rmax=50μm-W(waviness)+Rmax=max.100μmwavelengthmin.5mm-longitudinalscoringsinadmissible-Permissibleout-of-roundness:0.2mmfords≤250.3mmfords25-admissiblemouldoffsetandpartingedge:0.05mmfords≤200.1mmfords202)Thebeaddiameterisdeterminedaccordingtothefollowingequations:ds≤25:dw=ds×1.12ds25bis≤37:dw=ds+2.5ds37:dw=ds+33)Sharpedgesareinadmissible.4)Fords20mmFormAispreferablewhenthepull-offforceissubjecttomoredemandingrequirements.5)ds20mmisinadmissible.6)Admissiblemouldoffsetandpartingedgemax.0.04mm.Onlyroundedraisesareadmissible.7)Applicableforthepush-onlength28mmis:-longitudinalscorimgsareinadmissible.-Admissiblewaviness0.3mmwithin¼ofthecircumference.Fortesting,atestmandrelfallinginlinewiththemaximuminternaldiameteristobeinsertedintothehose.Page5DIN3021-3Table1:Dimensionsspringbandclamp/hose/spigotDimensionsinmillimetresSpringbandclampHoseSpigotLmininternaldiameterexternaldiameterbeaddiameternominaldiameterdnminimalfunctionaldiameterdfdilimitdimens.wallthicknesspdslimitdimensdwlimitdimensf+1xc=12c=151312,76,56,57,31413,78891514,78,58,59,61615,79,59,510,71716,3101011,21817,3111112,34,01918,3121213,52019,3131314,600,152120,31414±0,215,7-0,252221,315-0,53,5±0,41516,82322,316-11618,0242