1、BRITISH STANDARD BS EN 12284:2003 Refrigerating systems and heat pumps Valves Requirements, testing and marking The European Standard EN 12284:2003 has the status of a British Standard ICS 23.060.20 BS EN 12284:2003 This British Standard, was published under the authority of the Standards Policy and
2、 Strategy Committee on 26 September 2003 BSI 26 September 2003 ISBN 0 580 42699 8 National foreword This British Standard is the official English language version of EN 12284:2003. The UK participation in its preparation was entrusted to Technical Committee RHE/18, Refrigeration safety, which has th
3、e responsibility to: A list of organizations represented on this 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 Catalogue under the section entit
4、led “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance
5、 with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related inte
6、rnational and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 63 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendm
7、ents issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN12284 September2003 ICS23.060.20 Englishversion RefrigeratingsystemsandheatpumpsValvesRequirements, testingandmarking Systmesderfrigrationetpompeschaleur RobinetterieExigences,essaisetmarquage Kltean
8、lagenundWrmepumpenVentile Anforderungen,PrfungundKennzeichnung ThisEuropeanStandardwasapprovedbyCENon21April2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsand
9、bibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnoti
10、fiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingd
11、om. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN12284:2003EEN12284:2003(E) 2 Contents Page Foreword3 1
12、 Scope 3 2 Normativereferences 3 3 Termsanddefinitions. .4 4 ListofSymbols . .6 5 GeneralRequirements .7 6 Materials8 7 Design .10 8 Constructionandworkmanship .11 9 Testing 14 10 Markingandadditionalinformation. 17 11 Documentation.18 AnnexA (normative) Procedureforthedesignofavalvebyuseofasimplifi
13、edmethodofcalculation20 AnnexB (normative) Experimentaldesignmethodforvalves.23 AnnexC (normative) Determinationoftheallowablepressureatthemaximumoperatingtemperature .28 AnnexD (normative) Determinationoftheallowablepressureatminimumoperatingtemperature (Requirementstoavoidbrittlefracture) . .29 An
14、nexE (informative) Compilationofmaterialcharacteristicsofoftenusedmaterials 34 AnnexF (informative) Justificationoftheindividualmethods.54 AnnexZA (informative) RelationshipbetweenthisEuropeanStandardandtheEssential RequirementsofEUDirective97/23/EC. . 60 Bibliography 61EN12284:2003(E) 3 Foreword Th
15、isdocument(EN12284:2003)hasbeenpreparedbyTechnicalCommitteeCEN /TC 182,“Refrigerating systems,safetyandenvironmentalrequirements“,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyMarch2004
16、andconflictingnationalstandardsshallbewithdrawnatthelatestby March2004. ThisdocumenthasbeenpreparedunderamandategiventoCENbytheEuropeanCommissionandtheEuropean FreeTradeAssociation,andsupportsessentialrequirementsofEUDirective(s). ForrelationshipwithEUDirective(s),seeinformativeAnnexZA,whichisanint
17、egralpartofthisdocument. AnnexesA,B,C,DarenormativeandannexesEandFareinformative AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,
18、Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom. 1Scope ThisEuropeanstandardspecifiessafetyrequirements,safetyfactors,testmethods,testpressuresusedand markingofrefrigeratingvalvesandothercomponentswithsimilarbodies,hereinafterc
19、alledvalves,forusein refrigeratingsystems. Itdescribestheproceduretobefollowedwhendesigning(bycalculationorbyanexperimentaldesignmethod) valvepartssubjectedtopressureaswellasthecriteriatobeusedintheselectionofmaterials. Thestandarddescribesmethodsbywhichreducedimpactvaluesatlowtemperaturesmaybetaken
20、intoaccount inasafemanner. Thisstandardappliestothedesignofbodiesandbonnetsforpressurereliefdevices,includingburstingdisc devices,withrespecttopressurecontainmentbutitdoesnotapplytoanyotheraspectsofthedesignorapplication ofpressurereliefdevices. 2 Normativereferences ThisEuropeanStandardincorporates
21、bydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmento
22、rrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies. EN3781, RefrigeratingsystemsandheatpumpsSafetyandenvironmentalrequirementsPart1:Basic requirements,definitions,classificationandselectioncriteria. EN3782:2000, RefrigeratingsystemsandheatpumpsSafetyandenvironmentalrequ
23、irementsPart 2: Design,construction,testing,markinganddocumentation. EN3784, RefrigeratingsystemsandheatpumpsSafetyandenvironmentalrequirementsPart4:Operation, maintenance,repairandrecovery. EN7644, PressureequipmentPart4:Establishmentoftechnicaldeliveryconditionsformetallicmaterials. EN7645, Pressu
24、reequipmentPart5:ComplianceandInspectionDocumentationofMaterials. EN1563, FoundingSpheroidalgraphitecastirons.EN12284:2003(E) 4 EN100451, MetallicmaterialsCharpyimpacttestPart1:Testmethod. EN10087, FreecuttingsteelsTechnicaldeliveryconditionsforsemifinishedproducts,hotrolledbarsandrods. EN10204, Met
25、allicproductsTypesofinspectiondocuments. prEN125162, Industrialvalves ShelldesignstrengthPart2:Calculationmethodsforsteelvalveshells. EN134452:2002, UnfiredpressurevesselsPart2:Materials. prEN142761:2001, PressureequipmentforrefrigeratingsystemsandheatpumpsPart1:VesselsGeneral requirements. EN605342
26、1:1998, IndustrialprocesscontrolvalvesPart21:FlowcapacitySizingequationsforfluidflow underinstalledconditions(IEC 6053421:1 998). ENISO6708:1995, PipeworkcomponentsDefinitionandselectionofDN(nominalsize(ISO6708:1995). ISO7268:1983, PipecomponentsDefinitionofnominalpressure. CRISO15608:2000, WeldingG
27、uidelinesforametallicmaterialgroupingsystem(ISO/TR15608:2000). 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1 Valve devicewithshutoff,nonreturn,regulatingorcontrolfunctionsforrefrigerantfloworafilterdeviceinsimilar dimensions.Itcanbeoperatedbyhan
28、d,byanactuatororbythesystempressureoftheplant NOTE Theexpressioncontrolvalvedenotesanautomaticvalvewithafeedbacksystemandtheexpressionregulatingvalve denotesahandoperatedvalvewhichmayhaveashapedconetoassisttheregulatingfunction. 3.2 Operatingrange thecombinationoftemperatureandpressureconditionsatwh
29、ichthevalvecansafelybeoperated 3.3 Nominalsize(DN) analphanumericdesignationofsizeforcomponentsofapipeworksystemSeeENISO6708:1995 3.4 Nominalpressure(PN) avalueofapressureintherangeofthemaximumallowablepressureforplanningaplantoracomponent(see ISO7268:1983) 3.5 Corrosion allformsofmaterialwastage(e.
30、g.oxidation,erosion,wearandabrasion) 3.6 Maximumdesigntemperature highesttemperaturethatcanoccurduringoperationorstandstilloftherefrigeratingsystemorduringtestingunder testconditions 3.7 Minimumdesigntemperature lowesttemperaturethatcanoccurduringoperationorstandstilloftherefrigeratingsystemorduring
31、testingunder testconditionsEN12284:2003(E) 5 3.8 min t 0100 thelowesttemperatureatwhichthevalvecanbeusedataloadofupto100%oftheallowabledesignstressat 20C,takingthesafetyfactorsaccordingtoTableA.2intoaccount 3.9 min t 075 thelowesttemperatureatwhichthevalvecanbeused,ifisloadamountsto75%maximumoftheal
32、lowable designstressat20C,takingthesafetyfactorsaccordingtoTableA.2intoaccount 3.10 min t 025 thelowesttemperatureatwhichpressurepartscanbeused,iftheirloadamountsto25%maximumofthe allowabledesignstressat20C,takingthesafetyfactorsaccordingtoTableA.2intoaccountEN12284:2003(E) 6 4 ListofSymbols Symbols
33、usedinthisStandardaregiveninTable1: Table1Listofsymbols A L Elongationafterfracturewherethemeasuredlengthisequalorgreaterthan0,4 timesofdiameteroftherod mm A 5 Elongationafterfracturewherethemeasuredlengthisequal5timesof diameteroftherod % a Lifetimeinyears;forvalves20years anno C Q Factortocompensa
34、teforthequalityofacasting d e Negativewallthicknesstolerance mm e act Actualwallthicknessatgivenmeasuringpointsofthevalvetobetested mm e c Reductioninwallthicknesscausedbyoccuranceofcorrosion mm e con Componentwallthicknessasspecifiedinthedesigndrawing mm KV Impactruptureenergy J KV 0 Thresholdvalue
35、ofimpactruptureenergy,wheretheimpactruptureenergyis definedasindependentofthetemperature J KV 0 t Standardvalueofimpactruptureenergyatstandardtemperatureofthematerial J KV TSmin Impactruptureenergyatminimumoperatingtemperature TS min J K VS istherateofflowofwaterincubicmetresperhourforadifferentialp
36、ressure D p of 1bar(0,1MPa)attheratedfullopening m 3 /h L theleakageinpercentof K VS % N 6 is31,6accordingtoTable1ofEN6053421 PD Designpressure MPa P F Maximumallowabledesigntestpressure MPa PS Maximumallowablepressureincommonsense,withoutregardinganyinfluence oftemperature MPa PS 0 Maximumallowable
37、pressureatambienttemperature( - 10C to +50C) accordingtostrengthdesign(withouttemperaturecorrection) MPa PS TSmax Maximumallowablepressureatmaximumoperatingtemperature MPa PS TSmin Maximumallowablepressureatminimumoperatingtemperature MPa P Test Minimumbursttestpressure(greaterthan P F ) MPa p 1 Ups
38、treampressure MPa D p Differentialpressure MPa p Testingpressureofeachvalveafterproduction MPa Q M Massflowrate kg/h Q V upstreamflowrate m 3 /h R e1,0 Yieldstrength,1,0%offset MPa,N/mm 2 R e1,0 TSmax Yieldstrength,1,0%offsetathighestoperatingtemperature MPa,N/mm 2 R e 0,2 Yieldstrength,0,2%offsetat
39、ambienttemperature MPa,N/mm 2 R p 0,2 Proofstrength,0,2%offsetatambienttemperature MPa,N/mm 2 R p0,2 TSmin Proofstrength,0,2%offsetatminimumoperatingtemperature MPa,N/mm 2 R p 0,2/t Proofstrength,0,2%offsetattemperaturet MPa,N/mm 2 R p0,2 TS max Proofstrength,0,2%offsetathighestoperatingtemperature
40、MPa,N/mm 2 R p 1,0 Proofstrength,1,0%offsetatambienttemperature MPa,N/mm 2 R eH Upperyieldstrength MPa,N/mm 2 R eHTS max Upperyieldstrengthathighestoperatingtemperature MPa,N/mm 2 R m Tensilestrength MPa,N/mm 2EN12284:2003(E) 7 Table1( continued) R mTS max Tensilestrengthathighestoperatingtemperatur
41、e MPa,N/mm 2 R mact Actualtensilestrengthofthematerialofthevalvetobetested MPa,N/mm 2 R mcon Tensilestrengthusedforthedesign MPa,N/mm 2 r Densityoftheactualfluid kg/m 3 r 0 Densityofwaterat15,5C kg/m 3 r 1 Upstreamdensity kg/m 3 S C Factortocompensateeffectsofcorrosion S con Factorforthecalculationo
42、fthebursttestpressuretakingintoaccountthetensile strengthaccordingtoTableA.2(seefootnote d ofTableA.2) S F Factortoallowforforming S TSmin Factortakingintoconsiderationtheimpactstrengthreductionduetominimum operatingtemperature S TSmax Factortoallowforthereductioninstrengthduetothehighestoperating t
43、emperature S s Factortoallowforthetestpressure s con Initialdesignstress MPa,N/mm 2 s corr Allowablestressvaluesderivedfrom s con MPa,N/mm 2 TS Operatingtemperature C TS min Lowestoperatingtemperature C TS max Highestoperatingtemperature C V Innervolumeofavalve l X Correctionoftheactualwallthicknessrelativetothewallthicknessofthedesign k assignesthevalue 1 P p D Y Correctiononthebasisofcurrentstrengthvaluesofthetestsamplerelativeto thestrengthparametersforthedesignofvalves Z Factortoallowforthequalityofajoint(e.g.weldedjoint)
