1、BRITISH STANDARD AEROSPACE SERIES BS EN 3275:2002 Pipe coupling 8 30 up to 28 000 kPa Dynamic beam seal Metric series Technical specification The European Standard EN 3275:2002 has the status of a British Standard ICS 49.080 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN
2、 3275:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 10 May 2002 BSI 10 May 2002 ISBN 0 580 37650 8 National foreword This British Standa
3、rd is the official English language version of EN 3275:2002. The UK participation in its preparation was entrusted to Technical Committee ACE/12/1, Aerospace fasteners, fastening systems, details and parts (International), which has the responsibility to: A list of organizations represented on this
4、committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or
5、by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer im
6、munity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK.
7、Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 28, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Com
8、ments !“# “#$%“8+“$“$+#9 % +$+“+ “%#3+#0#!+ #“ $ +$3$3+ “+$+#0$+#$+$3$39+ #+$-$+“$+#Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,ItalyLuxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandUnitedKingdom. 3EN3275:2002(E) 1Scope IIand III accor
9、ding toISO6771andnominalpressureupto28000kPa. 2Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoo
10、rrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferences,thelatesteditionofthe publicationreferredtoapplies(includingamendments). ISO468, SurfaceroughnessParameters,theirvaluesandgeneralrulesforspecifyingrequirements. ISO2685, A
11、ircraftEnvironmentaltestprocedureforairborneequipmentResistancetofireindesignatedfire zones. ISO28591, SamplingproceduresforinspectionbyattributesPart1:Samplingschemesindexedbyacceptance qualitylimit(AQL)forlotbylotinspection. ISO6771, AerospaceFluidsystemsandcomponentsPressureandtemperatureclassifi
12、cations. ISO6772, AerospaceFluidsystemsImpulsetestingofhydraulichose,tubingandfittingassemblies. ISO7137, AircraftEnvironmentalconditionsandtestproceduresforairborneequipment. ISO7257, AircraftHydraulictubingjointsandfittingsRotaryflexuretest. ISO86251, AerospaceFluidsystemsVocabularyPart1:Generalte
13、rmsanddefinitionsrelatingto pressure. ISO9538, AerospaceHydraulictubingjointsandfittingsPlanarflexuretest. EN2813, AerospaceseriesAluminiumalloyALP6061T6Drawntubeforpressureapplications0,6mm a 12,5mm. 1 ) EN3042, AerospaceseriesQualityassuranceENaerospaceproductsQualificationprocedure. EN3120, Aeros
14、paceseriesTitaniumalloyTIP64003ColdworkedandstressrelievedSeamlesstubefor pressuresystems4mm D 51mm690MPa R m 1030MPa. 1 ) EN10204, MetallicproductsTypesofinspectiondocuments. TR2674, AerospaceseriesDesignandconstructionofpipelinesforfluidsinliquidorgaseousconditionRigid lines,installation. 2 ) MILH
15、5606, Hydraulicfluid,PetroleumBase,Aircraft,MissileandOrdnance. 3 ) MILH8446, Hydraulicfluid,NonpetroleumBase,Aircraft. 3 ) 1 )PublishedasAECMAPrestandardatthedateofpublicationofthisstandard 2 )PublishedasAECMATechnicalReportatthedateofpublicationofthisstandard 3 )Publishedby:DepartmentofDefense(DoD
16、),thePentagon,Washington,D.C.20301. 4EN3275:2002(E) 3Symbols A Elongation,inpercent D 0 Actualoutsidediameterofpipe,inmillimetres D 1 Actualinsidediameterofpipe,inmillimetres DN Nominaloutsidediameterofpipe P Workingpressure,inmegapascals R m Tensilestrength,inmegapascals R p0,2 0,2%proofstress,inme
17、gapascals s x Axialstressduetopressure,inmegapascals 4Termsanddefinitions Forthepurposesofthisstandard,thefollowingtermsanddefinitionsapply: 4.1Pressure Nominalpressure,proofpressure,impulsepressure,burstpressureaccordingtoISO86251. 4.2Coupling 4.2.1 Couplingassembly assembledandtorquetightenednut,f
18、erruleandpipematingwithe.g.unions,teesorelbows(Seefigure1) Key 1 Dynamicbeamseal 2 Ferrule 3N u t 4 Unionend Figure1Exampleofcouplingassembly 4.2.2 Straightcoupling unionconnectingpipetopipe 5EN3275:2002(E) 4.2.3 Forgedparts;shapedparts couplingsmachinedoutofindividualforgingblanks.Forcrosses,teesan
19、delbowsmachinedoutofbarorplatestock theterm“shaped“maybeused 4.3Surfacedefects 4.3.1 Surfaceirregularity nonconformitywithgeneralsurfaceappearance,possibledefect 4.3.2 Crack clean(crystalline)fracturepassingthroughoracrossthegrainboundariesthatpossiblyfollowsinclusionsofforeign elements.Cracksarenor
20、mallycausedbyoverstressingthemetalduringforgingorotherformingoperations,or duringheattreatment.Wherepartsaresubjecttosignificantreheating,cracksareusuallydiscolouredbyscale 4.3.3 Fold doublingoverofmetal,whichcanoccurduringtheforgingoperation.Foldscanoccuratorneartheintersectionof diameterchangesand
21、areespeciallyprevalentwithnoncircularnecks,shouldersandheads 4.3.4 Lap foldlikemachiningdefect 4.3.5 Seam (1) usuallyasurfaceopeningorcrackresultingfromadefectobtainedduringcastingorforging (2) extraneousmaterial,stringerinthematerial,whichisnothomogeneouswithbasemetal 4.3.6 Pit voidorholeinthesurfa
22、ceascaused,forexample,bycorrosion 4.4Qualityassurance 4.4.1 Productionbatch adefinitequantityofsomecommodityorserviceproducedatonetimeunderconditionsthatarepresumeduniform 4.4.2 Deliverybatch batchconsistingofcouplingswiththesameidentityblockwhichmaycomefromdifferentproductionbatches. 4.4.3 Acceptab
23、lequalitylevel(AQL) whenacontinuingseriesoflotsisconsidered,aqualitylevelwhichforthepurposesofsamplinginspectionisthe limitofasatisfactoryprocessaverage 6EN3275:2002(E) 4.4.4 Qualification testingrequiredtodemonstratesuccessfulperformanceofthecouplingassemblyinsimulatedservice(overload, destructivea
24、ndfatiguetests) 4.4.5 Majordefect adefectotherthancritical,thatislikelytoresultinafailureortoreducemateriallytheusabilityoftheconsidered productforitsintendedpurpose 4.4.6 Minordefect adefectthatisnotlikelytoreducemateriallytheusabilityoftheconsideredproductforitsintendedpurpose,orthat isadeparturef
25、romestablishedspecificationhavinglittlebearingontheeffectiveuseoroperationofthisproduct 5Requirements,inspectionandtestmethods Seetable1andtable2. 5.1Testconditionsandpreparationofspecimensforqualification Testsfluids. Unlessotherwisespecified,testsshallbecarriedoutusinge.g.apetroleumbasehydraulicfl
26、uidto MILH5606forcouplingassembliesoftype IItemperaturerangeandasilicateesterbasehydraulicfluidto MILH8446forthoseoftype IIItemperaturerange.Watermaybeused,wheneverpractical,forproof,burst,stress corrosionandreusecapabilitytesting.Forotherthanhydraulicsystemapplications,itispreferabletousesystem flu
27、idforleakage(gaseouspressure)andprooftesting.Whenspecifiedinthetestmethod,thetestfluidisusedas alubricant. Specimenpreparation. Shapedpartsshallbemachinedwiththegrainflowofthebarorplateinthedirectionof thefluid.Specimensshallbeassembledasillustratedintable2.Installationsonthepipeendshallbeinaccordan
28、ce withTR2674.Priortotesting,allcouplingsshallbeassembledusingthemaximumspecifiedtorque.Except,when specifiedintable2,thecouplingshallbeassembledusingtheminimuminstallationtorqueforatleasthalfofthe specimens,andmaximumtorquesfortheremainder. Pipeassembly. Themethodofjoiningthepipetothecouplingend(br
29、azing,welding,mechanicalattachment,etc.) shallnotbedetrimentaltotheproperties,strengthorgeometryofthepipeandthecouplingend.Thejointshallbe inaccordancewiththedesigninstructionsandshallbeinspectedbydirectmeasurement,Xrayorothernon destructivemethods. 7EN3275:2002(E) Table1Requirements,inspectionandte
30、stmethods Clause Characteristic Requirement Inspectionandtestmethod Q a A a 5.2 b Materials Conformitywiththeproduct standards Chemicalanalysisorcertificateof compliancetoEN10204issuedby thesemifinishedproduct manufacturer. X 100% X 100% 5.3 b Dimensions Fluidpassages Conformitywiththeproduct standa
31、rds Conformitywiththeproduct standards Suitablemeasuringinstruments Aballwithadiameter0,5mmless thantheminimumdiameterspeci fiedforthepassageshallpass throughthecoupling. X 100% X 100% X 50% X 20% 5.4 b Product identification Markingaccordingto productstandardsand definitiondocuments includingbatchi
32、dentification ofAnnexA.Itshallbe legibleandshallnot adverselyaffectthematerial orthefunctioningofthe products. Visualexamination X 100% X 100% 5.5 b Surface roughness Conformitywiththeproduct standards Interpretedinaccordance withISO468 Suitablemeasuringinstrumentsor visualtactilesamples X 100% X 10
33、0% 5.6 b Surface treatment Conformitywiththeproduct standards Visualexamination Thethreadshallbetestedusinga gaugewithatoleranceclassof 4h6h. X 100% X 100% 5.7 b Surfacedefects Threads Partsshallbefreefrom surfacedefectsindicatedin 4.3liabletohavean adverseaffectontheircha racteristicsandendurance.
34、Threadsmaybecut,rolled orground,excepttitanium alloyswhichshallbecutor rolled.Theexternalthreads ofcouplingsshouldbe rolledand,ifmachined, shallhaveanarithmetical meandeviation, R a ,ofthe profileof3,2mor smootherinaccordance withISO468. Thegrainflowinrolled threadsshallbecontinuous andfollowthegene
35、ral threadcontourwiththe maximumdensityatthe threadroot. Visualinspectionusingsuitableme thods Visualexamination Threadflanksinrolledthreadsshall beexaminedbymicroexamination. Specimensshallbetakenfromthe finishedpartbysectioningona longitudinalplaneacrossthe threadedarea.Thespecimensshall bepolishe
36、dandetchedtoreveal thesurfacedefects. X 100% X 100% X 10% X 100% X 100% X 5% 8EN3275:2002(E) Table1 (continued) Clause Characteristic Requirement Inspectionandtestmethod Q a A a 5.7 (con tinued) Laps,cracks,surface irregularitiesandseams (see4.3)arenot acceptableonanypartof thepressurethreadflank,in
37、 thethreadrootoronthe nonpressurethreadflank. Lapsandseams,depthsof whicharewithinthelimits oftable,areacceptableon thecrestandthenon pressurethreadflankabove thepitchdiameter. DN Depth mm 05 06 08 10 12 14to32 0,15 0,18 0,18 0,20 0,23 0,25 5.8 Proofpressure Thecouplingassembly shallwithstandapressu
38、re equaltotwicethenominal pressureofthefluidsystem for5minatambient temperaturewithout leakageandshallnotshow anyevidenceofpermanent deformationorothermal functionwhenusingthe specifiedtorquevalues. Thecouplingassemblyshallbe connectedtoapressuresource withoneendfreetomove. Rateofpressureincreasesha
39、llbe (15000037500)kPa/min. X 5.9 Gaseous pressure Thecouplingassembly shallwithstandagaseous pressureequaltothe nominalpressurefor5min, atambienttemperature. Thereshallbenovisible formationofbubblesafter 1minatpressureorother malfunctionthatwould affectassemblyor disassemblywhenusingthe torquevalues
40、specified. Thecouplingassemblyshallbe solventcleanedandairdriedprior totesting.Itshallbeassembledand tightenedtotheminimumtorques specifiedintable3.Itshallthenbe pressurizedwithnitrogentothe nominalpressure.Thispressure shallbemaintainedfor5minwhile thespecimensareimmersedin waterorsuitableoil(seefigure2). X 9
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