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 2009 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2009 02:00
2、, Uncontrolled Copy, (c) BSIBS EN 12729:2002 National foreword This British Standard is the UK implementation 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 repres
3、ented on this committe can be obtained on request to its secretary. This publication does not purport 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 S
4、tandard was published under the authority of the Standard Policy and Strategy Committee on 30 January 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 0 Licensed Co
5、py: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2009 02:00, Uncontrolled Copy, (c) BSIEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN12729 November2002 ICS13.060.20;91.140.60 Englishversion Devicestopreventpollutionbybackflowofpotablewater Controllablebackflowpreventerwithreducedpressurezone Fam
6、ilyBTypeA Dispositifsdeprotectioncontrelapollutionparretourde leaupotableDisconnecteurzonedepressionrduite contrlableFamilleBTypeA SicherungseinrichtungenzumSchutzdesTrinkwassers gegenVerschmutzungdurchRckflieenSystemtrenner mitkontrollierbarerdruckreduzierterZoneFamilieBTyp A ThisEuropeanStandardwa
7、sapprovedbyCENon7September2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicati
8、ontotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethe
9、nationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG Manag
10、ementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN12729:2002E Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2009 02:00, Uncontrolled Copy, (c) BSIEN12729:2002(E) 2 Contents page Foreword3 In
11、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
12、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
13、Presentationatdelivery . .25 AnnexA (informative) Examplesofpresentationoftestresults.26 Bibliography 32 BS EN12729:2002 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2009 02:00, Uncontrolled Copy, (c) BSIEN12729:2002(E) 3 Foreword Thisdocument(EN12729:2002)hasbeenpreparedbyTechnicalC
14、ommitteeCEN/TC164“Watersupply“,the secretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyMay2003,andconflictingnationalstandardsshallbewithdrawnatthelatestby May2003. TheannexAisinformative. Acc
15、ordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,Switzerland
16、andtheUnitedKingdom. BS EN12729:2002 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2009 02:00, Uncontrolled Copy, (c) BSIEN12729:2002(E) 4 Introduction Inrespectofpotentialadverseeffectsonthequalityofwaterintendedforhumanconsumption,causedbythe productcoveredbythisstandard: a) thissta
17、ndardprovidesnoinformationastowhethertheproductmaybeusedwithoutrestrictioninanyofthe MemberStatesoftheEUorEFTA; b) itshouldbenotedthat,whileawaitingtheadoptionofverifiableEuropeancriteria,existingnationalregulations concerningtheuseand/orthecharacteristicsofthisproductremaininforce. BS EN12729:2002
18、Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2009 02:00, Uncontrolled Copy, (c) BSIEN12729:2002(E) 5 1Scope ThisEuropeanStandardspecifiesthefieldofapplication,thedimensional,thephysicochemical,thedesign,the hydraulic,themechanical,andtheacousticcharacteristicsofcontrollablebackflowpr
19、eventerwithreduced pressurezoneFamilyBTypeA. ThisstandardcoverscontrollablebackflowpreventersofFamilyBTypeA,withreducedpressurezones,intended topreventbackflowbybacksiphoningorbackpressureofwaterintothepotablewaterdistributionsystemwhenever thepressureofthelatterislowerthanthesystemlocateddownstream
20、. ItisapplicabletocontrollablebackflowpreventersindenominationsDN8uptoDN250. ItcoverscontrollablebackflowpreventersofPN10thatarecapableofworkingwithoutmodificationoradjustment: atanypressureupto1MPa(10bar); withanypressurevariationupto1MPa(10bar); inpermanentdutyatalimitedtemperatureof65Cand90Cfor1h
21、maximum. Itspecifiesalsothetestmethodsandrequirementsforverifyingtheircharacteristics,themarkingandthe presentationatdelivery. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthet
22、ext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN8061:2000, Sp
23、ecificationsforinstallationsinsidebuildingsconveyingwaterforhumanconsumptionPart1: General. EN10921, FlangesandtheirjointsCircularflangesforpipes,valves,fittingsandaccessories,PNdesignated Part1:Steelflanges. EN10922, FlangesandtheirjointsCircularflangesforpipes,valves,fittingsandaccessories,PNdesig
24、nated Part2:Castironflanges. EN1717:2000,Protectionagainstpollutionofpotablewaterinwaterinstallationsandgeneralrequirementsof devicestopreventpollutionbybackflow. ENISO38221, AcousticsLaboratorytestsonnoiseemissionfromappliancesandequipmentusedinwater supplyinstallationsPart1:Methodofmeasurement(ISO
25、38221:1999). ENISO38223:1997, AcousticsLaboratorytestsonnoiseemissionfromappliancesandequipmentusedinwater supplyinstallationsPart3:Mountingandoperatingconditionsforinlinevalvesandappliances (ISO38223:1997). ENISO6509, CorrosionofmetalsandalloysDeterminationofdezincificationresistanceofbrass(ISO 650
26、9:1981). prEN13959, AntipollutioncheckvalvesDN6toDN250inclusiveFamilyETypeA,B,CandD. ISO71, PipethreadswherepressuretightjointsaremadeonthethreadsPart1:Dimensions,tolerancesand designation. BS EN12729:2002 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2009 02:00, Uncontrolled Copy, (c
27、) BSIEN12729:2002(E) 6 ISO2281, PipethreadswherepressuretightjointsarenotmadeonthethreadsPart1:Dimensions,tolerances anddesignation. ISO9227, CorrosiontestsinartificialatmosphereSaltspraytests. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thetermsanddefinitionsofEN1717andEN8061together
28、withthe followingapply. 3.1 controllablebackflowpreventerwithreducedpressurezoneFamilyBTypeA thespecificcharacteristicsofthisdevicecalled“BA”,(seeFigure1)areasfollows: 3pressurezonessuchthatupstream p 1 intermediate p i downstream p 2 (staticnoflowandunderwaterflow conditions); p 1 p i 14kPa(140mbar
29、); connectionfromtheintermediatepressurezone( p i )totheatmospherewhen p 1 p i 14kPa(140mbar); disconnectionbyventingtheintermediatepressurezone( p i )totheatmospherewhen p 1 shallbeupto14kPa (140mbar); aminimumsetdischargeflow(backflowrate); devicesthatallowverificationineveryzoneofthedisconnection
30、andthesealingoftheprotectiondevices (obturators,dischargevalves). Key 1 Upstreamzone p 1 2 Intermediatezone p i 3 Downstreamzone p 2 Figure1Designprinciple ForthepurposesofthisstandardcontrollablebackflowpreventerBAishereafterreferredtoasdevice. BS EN12729:2002 Licensed Copy: Wang Bin, ISO/EXCHANGE
31、CHINA STANDARDS, 09/07/2009 02:00, Uncontrolled Copy, (c) BSIEN12729:2002(E) 7 4Denomination ThedenominationofthedeviceisgiveninTable1: Table1DNversusthreadsandflanges D e n o m i n a t i o n D N 8 1 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(D
32、N) 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 AcontrollablebackflowpreventerwithreducedpressurezoneFamilyBTypeAisdesignatedby: its name; itsfamilya
33、nditstype; itsdenomination(seeTable1); itsconnectiontype; thematerialofitsbody; itssurfacefinish(possiblecoating); theacousticgroup(forDN 32); thereferencetothepresentstandard. Examplesforadesignation: ControllablebackflowpreventerwithreducedpressurezoneFamilyBTypeA,DN32,G1“1 /4xG1“1/4, bronze,I,EN1
34、2729. ControllablebackflowpreventerwithreducedpressurezoneFamilyBTypeA,DN100,flanged,castiron,epoxy coated,EN12729. 6Symbolization Thegraphicrepresentationofthe controllablebackflowpreventerwithreducedpressure zoneFamilyBTypeAis asfollows(seeFigure2): BS EN12729:2002 Licensed Copy: Wang Bin, ISO/EXC
35、HANGE CHINA STANDARDS, 09/07/2009 02:00, Uncontrolled Copy, (c) BSIEN12729:2002(E) 8 Figure2Graphicsymbol 7 Physicochemicalcharacteristics 7.1Materials Thematerialsandthecoatingsused,liabletocomenormallyoraccidentallyincontactwithpotablewater,shall satisfytheEUregulationsconcerningwaterquality. Andt
36、herefore,they: shallbecorrosionresistant; shallbepronetotheleastscalingpossible; shallbeinconformitywiththeEuropeanStandardsandregulations; shallbecompatibleamongthemselvesand: withthewaterdistribute; withthefluidsormatterliabletocomeintocontactwiththem; withtheproductsnormallyusedfordisinfectionope
37、rationsofthenetworks:potassiumpermanganateand sodiumhypochlorite. 7.2 Natureofthematerials a) Thechoiceofmaterialsislefttothediscretionofthemanufacturer. Copperzincalloyscontainingmorethan10%zincaresubjecttodezincificationwhensubmittedtowater capableofdezincification.Inthecountrieswheretheuseofprodu
38、ctsmadeofdezincificationresistant materialsisrequired,theproductshavetoguaranteeadezincificationdepthlessthan200minanydirection, theyhavetobetestedinaccordancewithENISO6509andhavetobemarkedincompliancewiththe indicationsinclause11; NOTE Thisstandarddoesnotcovernonmetallicbodies. b) neitherthemateria
39、lsnorthecoatingsusedshall,bynormaloraccidentalcontactwithdrinkingwater,cause anyriskofaffectingormodifyingthewateruptoatemperatureof90C.Thesuitabilityofthewaterforhuman consumptionisdefinedbynationalregulations; c) themanufacturershallstateinhistechnicalandsalesliteraturethenatureofthematerialsandth
40、ecoatings selected; d) thematerials,andinparticularcopperalloys,forwhichrecommendationsorinternationalstandardexistsshall complywiththerelevantrecommendationsorinternationalstandards. BS EN12729:2002 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2009 02:00, Uncontrolled Copy, (c) BSIE
41、N12729:2002(E) 9 8Design 8.1General a) Theinternalcomponentsofthedeviceshallbeaccessibleforinspection,repairorreplacement;these operationsshallbepossibleonthedeviceinstalled.TodevicesDN 50. Inalltheinstallationpositionsindicatedbythemanufacturer,anywaterretentionshallnotbepossiblewithinthe intermedi
42、atezone. Thecrosssectionsofthepassageorificesandofthepilottubeforoperationthereliefdeviceshallbeequaltoor greaterthan45mm 2 withDN 15,or12,5mm 2 withDN 15,nodimensionforthecalculationofthecrosssection shallbelessthan4mm.Theoutsidepilottubeshallbemadesoasnottobesubjectofanypermanentdeformation orrupt
43、ureunderoutsidestresses. Anairbreaktodrainshallexistbetweenanywastedrainandanymeansofcollectingthedischargedwater(floor, tundish,curb,sink,.). BS EN12729:2002 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2009 02:00, Uncontrolled Copy, (c) BSIEN12729:2002(E) 10 Thedevicewithanairbreaktodrainfittedshallevacuatethefullreliefflowrateasdefinedin9.7.7withoutspilling totheoutside. TheairbreaktodrainshallmeetthedimensionalrequirementsasspecifiedinEN1717. Thisairbreaktodrain
