1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12756:2001 The Euro
2、pean Standard EN 12756:2000 has the status of a British Standard ICS 21.140 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Mechanical seals Principal dimensions, designation and material codesThis British Standard, having been prepared under the direction of the Engineering S
3、ector Committee, was published under the authority of the Standards Committee and comes into effect on 15 February 2001 BSI 02-2001 ISBN 0 580 35768 6 BS EN 12756:2001 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard is the official English language
4、version of EN 12756:2000. The UK participation in its preparation was entrusted by Technical Committee MCE/6, Pumps and pump testing, to Subcommittee MCE/6/2, Dimensions and technical specifications, which has the responsibility to: aid enquirers to understand the text; present to the responsible Eu
5、ropean 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. A list of organizations represented on this subcommittee can be obtained on request to its secreta
6、ry. 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 by using the “Find” facility of the BSI Standards E
7、lectronic 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 immunity from legal obligations. Summary of pages Thi
8、s document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN12756 December2000 ICS21.140 Englishversion M
9、echanicalsealsPrincipaldimensions,designationand materialcodes GarnituresmcaniquesdtanchitDimensions principales,dsignationetcodesmatriaux GleitringdichtungenHauptmae,Bezeichnungund Werkstoffschlssel ThisEuropeanStandardwasapprovedbyCENon8November1999. CENmembersareboundtocomplywiththeCEN/CENELECInt
10、ernalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeoffic
11、ialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,G
12、ermany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2000CEN Allrightsofexploitationinanyformand
13、byanymeansreserved worldwideforCENnationalMembers. Ref.No.EN12756:2000EPage2 prEN12756:2000 Contents Page Foreword3 1 Scope4 2 Normativereferences 4 3 Dimensions 5 4 Standarddesignation 9 5 Materialkey 11Page3 prEN12756:2000 Foreword ThisEuropeanStandardhasbeenpreparedbyTechnicalCommitteeCEN/TC197“P
14、umps“,thesecretariatof whichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyJune2001,andconflictingnationalstandardsshallbewithdrawnatthelatestby June2001. AccordingtotheCEN/CENELECInternalRegulations,thena
15、tionalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden, SwitzerlandandtheUnitedKingdom.Page4 prEN12756:2000 1Scope ThisE
16、uropeanStandarddefinestheprincipaldimensionsfortheinternalinstallationofsingleandmultiple mechanicalsealswith(rotating)springunitsintothepumpsealingcavityaccordingtoISO3069asminimumcavity dimensionsastypicalforcentrifugalpumpsinaccordancewithEN22858andEN733.Italsogivestheseal designationsandmaterial
17、codestobeused. 2Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicat
18、ionsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies. EN733, Endsuctioncentrifugalpumps,rating10barwithbearingbracket Nominaldutypoint,maindimensions, designationsystem EN22858,Endsuctioncentrifugalpumps(
19、rating16bar) Designation,nominaldutypointanddimensions (ISO2858:1975) ISO1382, Rubber VocabularyTrilingualedition ISO1629, Rubbersandlatices Classification,symbols ISO27681, Generaltolerances Part1:Tolerancesforlinearandangulardimensionswithoutindividualtolerance indications ISO3069, Endsuctioncentr
20、ifugalpumps Dimensionsofcavitiesformechanicalsealsandforsoftpacking ISO5199, Technicalspecificationsforcentrifugalpumps ClassII ISO9905, Technicalspecificationsforcentrifugalpumps ClassI ISO9908, Technicalspecificationsforcentrifugalpumps ClassIIIPage5 prEN12756:2000 3Dimensions Themechanicalseals(a
21、bbreviation:GLRD 1 )andcavitiesneednotcorrespondtotheillustrations,however,the dimensionsgivenshallbecompliedwith.ThefiguresshowOringsastheflexibleelementsbutothershapesof sealsmayalsobeused. Generaltolerances: ISO2768 m 3.1Exampleforasinglemechanicalseal 2 withrotatingspringunit,versionNandK 3 NOTE
22、 Alternativearrangementsusingthesamedimensionscanbepossible. TypeU withoutshaftstep TypeB withshaftstep Dimensionsinmillimeters Dimensionsinmillimeters Key 1 rounded 2 springloadedleadface 3 seat Figure1Examplesforsinglemechanicalseals 1 basedontheGermanterminology 2 forabbreviationsconcerningarrang
23、ementsofshaftsealsrefertoISO5199 3 N=Normal,K=ShortPage6 prEN12756:2000 3.2Retentionoftheseat 3.2.1 Againstrotation Thedesignisatthedescretionofthemanufacturerorasagreed. usingaradialpin usinganaxialpin Dimensionsinmillimeters Dimensionsinmillimeters Key 1 seat Figure2Retentionoftheseatagainstrotati
24、on TheseoptionsarevalidforbothtypesUandB. 3.2.2 Againstaxialmovementusingasecuringringandstationaryseathousing(onlyvalidformechanical sealsontheproductsidewithmultiplearrangements) ExampleofTypeU ExampleofTypeB Key 1 Seathousing 2 Securingring Figure3Retentionoftheseatagainstaxialmovement Thedimensi
25、oneandd 9 refertotheseathousing.Themanufacturerofthemechanicalsealhastodeliverthe securingringondemand.Page7 prEN12756:2000 3.3DimensionsforversionsNandK Table1DimensionsforversionsNandK Dimensionsinmillimeters d 1 d 2 d 3 1) d 5 d 6 d 7 d 8 d 9 el 1 2) l 2 l 3 l 5 l 6 l 7 Nominal Maximum Version Ve
26、rsion l 4 diameter dimensions N K Type Type Type Type Type Type Type Type Type Type Type UBBUB UB UBUB + 0 , 5 h6 h6 h8 H11 H8 H8 H8 0,5 0,5 0,5 0,5 0,5 0 10 14 20 24 17 21 26 30 12 16 22 26 19 23 28 32 50 32,5 40 14 18 24 32 21 25 30 38 40 18 1,5 4 8,5 16 20 26 34 23 27 32 40 55 35 42,5 18 22 32 36
27、 27 33 38 42 20 24 34 38 29 35 40 43 45 37,5 45 22 26 36 40 31 37 42 46 60 24 28 38 42 33 39 3 43 48 4 25 30 39 44 34 40 46 50 40 47,5 28 33 42 47 37 43 48 53 50 20 5 30 35 44 49 39 45 50 60 2 32 38 46 54 42 48 53 62 65 42,5 50 33 38 47 54 42 48 53 62 35 40 49 56 44 50 60 65 55 38 43 54 59 3) 49 56
28、62 67 3) 40 45 56 61 51 58 65 70 75 9 43 48 59 64 54 61 67 72 45 52,5 23 45 50 61 66 56 63 70 75 48 53 64 69 59 66 72 77 60 50 55 66 71 62 70 75 86 6 53 58 69 78 65 73 77 88 85 47,5 57,5 55 60 71 80 67 75 86 91 58 63 78 83 70 78 88 93 70 25 60 65 80 85 72 80 91 96 62,5 63 68 83 88 75 83 4 93 98 6 52
29、,5 2,5 65 70 85 90 77 85 96 103 95 68 88 81 90 98 70 75 90 99 83 92 103 108 80 75 80 99 104 88 97 108 120 70 80 85 104 109 95 105 120 125 60 28 7 85 90 109 114 100 110 125 130 105 90 95 114 119 105 115 130 135 90 3 95 100 119 124 110 120 135 140 65 75 100 105 124 129 115 125 140 145 1)Inordertoprovi
30、deasafeclearancebetweenthemechanicalsealandthesealhousing,thedimensions d 3 arerecommendedasthe maximumdimensions. 2)Themanufacturerofthemechanicalsealmaysupplyashortersealthanthatwhichcorrespondstodimensionl 1 .Inthiscase,the differenceinlenghtsshouldbecompensatedbyuseofaspacer,whichshouldbesupplie
31、dbythesealmanufacturer.Formaterial ssee Position5ofmaterialkey(seeclause5). 3)Thosedimensionsarenotdefined.Theymayvary,dependingonthemanufacturerofthemechanicalsealandshouldtherefore be obtainedfromtherelevantsuppliersliterature.Page8 prEN12756:2000 3.4Surfacecondition Surfaceconditionsshallcomplyto
32、thevaluesgiveninTable2. Table2Surfacecondition Secondarysealmaterial x = z = Elastomers 1) Ra2,5 Ra0,8 Nonelastomersoroptionaluseof elastomersandnonelastomers Ra1,6 Ra0,20 1) ForexplanationofelastomersrefertoISO 1382;symbolsfor rubbersandlatices,refertoISO1629. Figure4SurfacelocationPage9 prEN12756:
33、2000 4Standarddesignation Thissectionsetsoutacodingsystemforuseindesignatingsingleandmultiplesealsbysealtype,bynominal dimension,byorientation,andbytheclassesofmaterialsused.Thesystemisintendedtobetypicalofthosein currentuseandwillhelpinthetransferofinformationbetweensuppliersandusers.Itisnotintende
34、dtofullyand unambiguouslyidentifyfacetsofasealassembly.Itisintendedtohelptoidentifyandgroupsealsforrecording purposesandforsubsequentanalysis. NOTE ItisnotarequirementofthisEuropeanStandardthatsealsaremarkedwithadesignationderivedfromthissystem. 4.1Schematicrepresentationofadesignationforsinglemecha
35、nicalseals Abbreviations Materialke y (seeclause5 ) Characteristics Standard Term Mechanicalseal orforshort:GLRD EN12756 N=N K=K Version U=U B=B Type Nominaldiameter RRi ghthandrotation LLefthandrotation SCapabilit yofrotationineitherdirection clockwiserotationofthesealunitwhenviewedfrom theseat = a
36、nticlockwiserotationofthesealunitwhenviewed fromtheseat = Directionofrotationofthemechanicalseal Nominaldiameter ofthemechanicalseal d 1 (Athreedi gitnumberonprinciple,fortwodi gitnumbersfor d 1 aprecededzeroistobeinserted ) 0withoutretention 1withretention Retentionagainstrotationoftheseat 4.2Examp
37、leofdesignationforasinglemechanicalseal Designationofasinglemechanicalsealofnormaldesign(N)informUwithnominaldiameter d 1 =43mm(043), righthandrotation(R),withsecuringoftheatmosphericsideseatagainstrotation(1),materialofthesealface ChromiumcaststeelS,materialoftheseatCarbon,resinimpregnatedB,materia
38、lofflexibleelements FluorocarbonrubberV,materialofthespringCrNiMosteelGandmaterialofothercomponentsCrNiMosteelG: MechanicalsealEN12756NU043R1SBVGG orforshort: GLRDEN12756NU043R1SBVGGPage10 prEN12756:2000 4.3Schematicrepresentationofdesignationformultiplemechanicalseals(D1Backtoback arrangement) 4 Ab
39、breviation Characteristics Standard Term Mechanicalseal orforshort:GLRD EN12756 U=U B=B productside Type U=U B=B Nominaldiameter Nominaldiameter ofthemechanicalseal d 1 (Athreedigitnumberonprinciple,fortwodigitnumbersfor d 1 aprecededzeroistobeinserted) RRighthandrotation LLefthandrotation SCapabili
40、tyofrotationineitherdirection clockwiserotationofthesealunitattheatmosphere sidewhenviewedfromtheseat = anticlockwiserotationofthesealunitattheatmosphere = sidewhenviewedfromtheseat Directionofrotationofthemechanicalseal onproductside 0withoutretention Retentiona gainstrotationoftheseatonatmospheres
41、ideand/ortheseat Materialkey (seeclause5) Positions1to5 forproductside Type atmosphereside 0withoutretention Dwithretention Retentionoftheseatontheproduct sidea gainstaxialmovement 1withretentionoftheseatontheatmosphereside 2withretentionoftheseatontheproductside 3withretentionoftheseatontheatmosphe
42、resideandoftheseatontheproductside Positions1to3 foratmosphereside 4.4Exampleofdesignationforamultiplemechanicalseal(D1) Designationofamultiplemechanicalseal(D1)typeUU(UU)withnominaldiameter d 1 =43mm(043),capabilityof rotationineitherdirection(S),withretentionagainstrotationoftheseatonatmospheresid
43、e(1),withretention againstaxialmovementoftheseatontheproductside(D)andwiththematerialkeyinaccordancewithclause5 (VBVGGSBV): MechanicalsealEN12756UU043S1DVBVGGSBV orforshort: GLRDEN12756UU043S1DVBVGGSBV NOTE Multiplemechanicalseals(D1Backtobackarrangement)consistofsinglemechanicalseals,versionK.For m
44、ultiplemechanicalseals(D1)withshorterlengththetotallengthisnotstandardized. 4 seeISO9905andISO9908Page11 prEN12756:2000 5Materialkey Materialofsealface Pos.1 Pos.2 Pos.3 Pos.4 Pos.5 Materialofseat Materialofflexibleelements Materialofsprin gs (excludingcoverandshaftsleeve ) Materialofothercomponents Table3Explanationofsymbolsformaterialversions Position1/Position
