EN 12729-2002 en Devices to prevent pollution by backflow of potable water - Controllable backflow preventer with reduced pressure zone - Family B - Type A《防止饮用水回流污染的装置 减压区可控的防回流装置.pdf

1、BRITISH STANDARD Devices to prevent pollution by backflow of potable water Controllable backflow preventer with reduced pressure zone Family B Type A ICS 13.060.20; 91.140.60 BS EN 12729:2002 Incorporating corrigendum April 2009BS EN 12729:2002 National foreword This British Standard is the UK imple

2、mentation of EN 12729:2002. The UK participation in its preparation was entrusted by Technical Committee B/504, Water upply, to Subcommittee B/504/4, Backflow revention. A list of organizations represented on this committe can be obtained on request to its secretary. This publication does not purpor

3、t to include all necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standard Policy and Strategy Committee on 30 Januar

4、y 2003 BSI 2009 ISBN 978 0 580 65889 1Date Comments Correction to the committee details in the ational foreword s p sub e the Amendments/corrigenda issued since publicationn 3 April 2009 0EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN12729 November2002 ICS13.060.20;91.140.60 Englishversion Device

5、stopreventpollutionbybackflowofpotablewater Controllablebackflowpreventerwithreducedpressurezone FamilyBTypeA Dispositifsdeprotectioncontrelapollutionparretourde leaupotableDisconnecteurzonedepressionrduite contrlableFamilleBTypeA SicherungseinrichtungenzumSchutzdesTrinkwassers gegenVerschmutzungdur

6、chRckflieenSystemtrenner mitkontrollierbarerdruckreduzierterZoneFamilieBTyp A ThisEuropeanStandardwasapprovedbyCENon7September2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteratio

7、n.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoits

8、ownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdo

9、m. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN12729:2002EEN12729:2002(E) 2 Contents page Foreword3 In

10、troduction .4 1 Scope 5 2 Normativereferences 5 3 Termsanddefinitions. .6 4 Denomination .7 5 Designation.7 6 Symbolization.7 7 Physicochemicalcharacteristics 8 7.1 Materials8 7.2 Natureofthematerials . .8 8 Design .9 8.1 General9 8.2 Reliefvalve .9 9 Characteristicsandtests . .10 9.1 General10 9.2

11、Generaltolerances .10 9.3 Expressionoftheresults. .10 9.4 Dimensionalcharacteristics . 10 9.5 Mechanicalcharacteristics .11 9.6 Tightnesscharacteristics. .15 9.7 Hydrauliccharacteristics . .18 10 Orderoftesting . .23 11 Markingandtechnicaldocuments .24 11.1 Marking .24 11.2 Technicaldocuments 24 12

12、Presentationatdelivery . .25 AnnexA (informative) Examplesofpresentationoftestresults.26 Bibliography 32 BS EN12729:2002EN12729:2002(E) 3 Foreword Thisdocument(EN12729:2002)hasbeenpreparedbyTechnicalCommitteeCEN/TC164“Watersupply“,the secretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiven

13、thestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyMay2003,andconflictingnationalstandardsshallbewithdrawnatthelatestby May2003. TheannexAisinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesa

14、reboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom. BS EN12729:2002EN12729:2002(E) 4 Introduction Inrespectofpotentialadverseeffect

15、sonthequalityofwaterintendedforhumanconsumption,causedbythe productcoveredbythisstandard: a) thisstandardprovidesnoinformationastowhethertheproductmaybeusedwithoutrestrictioninanyofthe MemberStatesoftheEUorEFTA; b) itshouldbenotedthat,whileawaitingtheadoptionofverifiableEuropeancriteria,existingnati

16、onalregulations concerningtheuseand/orthecharacteristicsofthisproductremaininforce. BS EN12729:2002EN12729:2002(E) 5 1Scope ThisEuropeanStandardspecifiesthefieldofapplication,thedimensional,thephysicochemical,thedesign,the hydraulic,themechanical,andtheacousticcharacteristicsofcontrollablebackflowpr

17、eventerwithreduced pressurezoneFamilyBTypeA. ThisstandardcoverscontrollablebackflowpreventersofFamilyBTypeA,withreducedpressurezones,intended topreventbackflowbybacksiphoningorbackpressureofwaterintothepotablewaterdistributionsystemwhenever thepressureofthelatterislowerthanthesystemlocateddownstream

18、 ItisapplicabletocontrollablebackflowpreventersindenominationsDN8uptoDN250. ItcoverscontrollablebackflowpreventersofPN10thatarecapableofworkingwithoutmodificationoradjustment: atanypressureupto1MPa(10bar); withanypressurevariationupto1MPa(10bar); inpermanentdutyatalimitedtemperatureof65Cand90Cfor1h

19、maximum. Itspecifiesalsothetestmethodsandrequirementsforverifyingtheircharacteristics,themarkingandthe presentationatdelivery. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthet

20、ext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN8061:2000, Sp

21、ecificationsforinstallationsinsidebuildingsconveyingwaterforhumanconsumptionPart1: General. EN10921, FlangesandtheirjointsCircularflangesforpipes,valves,fittingsandaccessories,PNdesignated Part1:Steelflanges. EN10922, FlangesandtheirjointsCircularflangesforpipes,valves,fittingsandaccessories,PNdesig

22、nated Part2:Castironflanges. EN1717:2000,Protectionagainstpollutionofpotablewaterinwaterinstallationsandgeneralrequirementsof devicestopreventpollutionbybackflow. ENISO38221, AcousticsLaboratorytestsonnoiseemissionfromappliancesandequipmentusedinwater supplyinstallationsPart1:Methodofmeasurement(ISO

23、38221:1999). ENISO38223:1997, AcousticsLaboratorytestsonnoiseemissionfromappliancesandequipmentusedinwater supplyinstallationsPart3:Mountingandoperatingconditionsforinlinevalvesandappliances (ISO38223:1997). ENISO6509, CorrosionofmetalsandalloysDeterminationofdezincificationresistanceofbrass(ISO 650

24、9:1981). prEN13959, AntipollutioncheckvalvesDN6toDN250inclusiveFamilyETypeA,B,CandD. ISO71, PipethreadswherepressuretightjointsaremadeonthethreadsPart1:Dimensions,tolerancesand designation. BS EN12729:2002EN12729:2002(E) 6 ISO2281, PipethreadswherepressuretightjointsarenotmadeonthethreadsPart1:Dimen

25、sions,tolerances anddesignation. ISO9227, CorrosiontestsinartificialatmosphereSaltspraytests. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thetermsanddefinitionsofEN1717andEN8061togetherwiththe followingapply. 3.1 controllablebackflowpreventerwithreducedpressurezoneFamilyBTypeA thespec

26、ificcharacteristicsofthisdevicecalled“BA”,(seeFigure1)areasfollows: 3pressurezonessuchthatupstream p 1 intermediate p i downstream p 2 (staticnoflowandunderwaterflow conditions); p 1 p i 14kPa(140mbar); connectionfromtheintermediatepressurezone( p i )totheatmospherewhen p 1 p i 14kPa(140mbar); disco

27、nnectionbyventingtheintermediatepressurezone( p i )totheatmospherewhen p 1 shallbeupto14kPa (140mbar); aminimumsetdischargeflow(backflowrate); devicesthatallowverificationineveryzoneofthedisconnectionandthesealingoftheprotectiondevices (obturators,dischargevalves). Key 1 Upstreamzone p 1 2 Intermedi

28、atezone p i 3 Downstreamzone p 2 Figure1Designprinciple ForthepurposesofthisstandardcontrollablebackflowpreventerBAishereafterreferredtoasdevice. BS EN12729:2002EN12729:2002(E) 7 4Denomination ThedenominationofthedeviceisgiveninTable1: Table1DNversusthreadsandflanges D e n o m i n a t i o n D N 8 1

29、01 52 02 53 24 0 Threads (designationinaccordance withISO71) 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 Flanges(DN) 40 DenominationDN 50 65 80 100 125 150 200 250 Threads (designationinaccordance withISO71) 2 Flanges(DN) 50 65 80 100 125 150 200 250 NOTE Forspecificationsofthreadsandflangessee9.4. 5Designation A

30、controllablebackflowpreventerwithreducedpressurezoneFamilyBTypeAisdesignatedby: its name; itsfamilyanditstype; itsdenomination(seeTable1); itsconnectiontype; thematerialofitsbody; itssurfacefinish(possiblecoating); theacousticgroup(forDN 32); thereferencetothepresentstandard. Examplesforadesignation

31、 ControllablebackflowpreventerwithreducedpressurezoneFamilyBTypeA,DN32,G1“1 /4xG1“1/4, bronze,I,EN12729. ControllablebackflowpreventerwithreducedpressurezoneFamilyBTypeA,DN100,flanged,castiron,epoxy coated,EN12729. 6Symbolization Thegraphicrepresentationofthe controllablebackflowpreventerwithreduce

32、dpressure zoneFamilyBTypeAis asfollows(seeFigure2): BS EN12729:2002EN12729:2002(E) 8 Figure2Graphicsymbol 7 Physicochemicalcharacteristics 7.1Materials Thematerialsandthecoatingsused,liabletocomenormallyoraccidentallyincontactwithpotablewater,shall satisfytheEUregulationsconcerningwaterquality. Andt

33、herefore,they: shallbecorrosionresistant; shallbepronetotheleastscalingpossible; shallbeinconformitywiththeEuropeanStandardsandregulations; shallbecompatibleamongthemselvesand: withthewaterdistribute; withthefluidsormatterliabletocomeintocontactwiththem; withtheproductsnormallyusedfordisinfectionope

34、rationsofthenetworks:potassiumpermanganateand sodiumhypochlorite. 7.2 Natureofthematerials a) Thechoiceofmaterialsislefttothediscretionofthemanufacturer. Copperzincalloyscontainingmorethan10%zincaresubjecttodezincificationwhensubmittedtowater capableofdezincification.Inthecountrieswheretheuseofprodu

35、ctsmadeofdezincificationresistant materialsisrequired,theproductshavetoguaranteeadezincificationdepthlessthan200minanydirection, theyhavetobetestedinaccordancewithENISO6509andhavetobemarkedincompliancewiththe indicationsinclause11; NOTE Thisstandarddoesnotcovernonmetallicbodies. b) neitherthemateria

36、lsnorthecoatingsusedshall,bynormaloraccidentalcontactwithdrinkingwater,cause anyriskofaffectingormodifyingthewateruptoatemperatureof90C.Thesuitabilityofthewaterforhuman consumptionisdefinedbynationalregulations; c) themanufacturershallstateinhistechnicalandsalesliteraturethenatureofthematerialsandth

37、ecoatings selected; d) thematerials,andinparticularcopperalloys,forwhichrecommendationsorinternationalstandardexistsshall complywiththerelevantrecommendationsorinternationalstandards. BS EN12729:2002EN12729:2002(E) 9 8Design 8.1General a) Theinternalcomponentsofthedeviceshallbeaccessibleforinspectio

38、n,repairorreplacement;these operationsshallbepossibleonthedeviceinstalled.TodevicesDN 50. Inalltheinstallationpositionsindicatedbythemanufacturer,anywaterretentionshallnotbepossiblewithinthe intermediatezone. Thecrosssectionsofthepassageorificesandofthepilottubeforoperationthereliefdeviceshallbeequa

39、ltoor greaterthan45mm 2 withDN 15,or12,5mm 2 withDN 15,nodimensionforthecalculationofthecrosssection shallbelessthan4mm.Theoutsidepilottubeshallbemadesoasnottobesubjectofanypermanentdeformation orruptureunderoutsidestresses. Anairbreaktodrainshallexistbetweenanywastedrainandanymeansofcollectingthedi

40、schargedwater(floor, tundish,curb,sink,.). BS EN12729:2002EN12729:2002(E) 10 Thedevicewithanairbreaktodrainfittedshallevacuatethefullreliefflowrateasdefinedin9.7.7withoutspilling totheoutside. TheairbreaktodrainshallmeetthedimensionalrequirementsasspecifiedinEN1717. Thisairbreaktodrainshallbe: eithe

41、rdirectlyincorporatedintothedevice; orfactoryfitted; orsuppliedwiththedevice. Inthelattercase,therelieforificeofthedeviceshallpermit,neitherthefittingofastandardizedthreadedpipe,nor theconnectionofastandardizedpipeorshape,beitbyglue,weldingorinterlocking. 9 Characteristicsandtests 9.1General Perform

42、ancetestsshallbecarriedoutonthedeviceasinstalledinaccordancewiththemanufacturerstechnical documents,subjecttodimension hbeingcompliedwith. Ifnotspecifiedalltestsshallbeperformedwithwateratanambienttemperature. 9.2General tolerances 9.2.1 Accuracyofmeasurements Intheabsenceofanyparticularspecifications: flowrateandpressure: 2%ofthevaluespecified; temperature: coldwater 5Cofthevaluespecified; hotwater 2Cofthevaluespecified; time 0 10% + ofthevaluespecified. 9.2.2 Accuracyofmeasuringinstruments Allthemeasuringinstrumentsshallhaveanerrorlimitof 2%ofthemeasuredvalue. 9.3 Expressionoftheresults The