EN 13079-2003 en Devices to prevent pollution by backflow of potable water Air gap with injector Family A-Type D《防饮用水回流污染装置 带喷射器的气隙 A类D型》.pdf

1、BRITISH STANDARD BS EN 13079:2003 Devices to prevent pollution by backflow of potable water Air gap with injector Family A-Type D The European Standard EN 13079:2003 has the status of a British Standard ICS 13.060.20; 23.060.99; 91.140.60 BS EN 13079:2003 This British Standard, was published under t

2、he authority of the Standards Policy and Strategy Committee on 2 October 2003 BSI 2 October 2003 ISBN 0 580 42704 8 National foreword This British Standard is the official English language version of EN 13079:2003. The UK participation in its preparation was entrusted by Technical Committee B/504, W

3、ater supply, to Subcommittee B/504/4, Backflow prevention devices, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications refe

4、rred to in this document may be found in the BSI Catalogue under the section entitled “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 provi

5、sions of a contract. Users are responsible for its correct application. Compliance 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,

6、 or proposals for change, and keep the UK interests informed; monitor related international 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 10, an inside back cover and a back cover.

7、 The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN13079 September2003 ICS13.060.20;23.060.99;91.140.60 Englishversion Devicestopreventpollutionby

8、backflowofpotablewaterAir gapwithinjectorFamilyATypeD Disconnexionsanspicemobilepourlaprventiondela contaminationdeleaupourretourSpcificationpourles surversesparinjecteurdetypeAD SicherungseinrichtungenzumSchutzdesTrinkwassers gegenVerschmutzungdurchRckflieenFreierAuslauf mitInjektorFamilieATypD Thi

9、sEuropeanStandardwasapprovedbyCENon1August2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobt

10、ainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions.

11、CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATIO

12、N EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN13079:2003EEN13079:2003(E) 2 Contents page Foreword3 Introduction .4 1 Scope 5 2 Normativereferences 5 3 Termsanddefinit

13、ions. .5 4 Designation.6 5 Symbolization.6 6 Materials6 7 Requirements .6 7.1 General6 7.2 Upstreamfeedorifice . .7 7.3 Downstreamreceivingorifice .7 7.4 Receivingvessel 7 7.5 Draintoatmosphere . .7 7.6 Airgap(Distance“A“) .7 7.7 Backflow/Backpressure .8 7.8 Verification8 8 Marking(notrequiredforsit

14、econstructedproducts) 9 9 Technicaldocuments . .10EN13079:2003(E) 3 Foreword Thisdocument(EN13079:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC164,“Watersupply“,the secretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor b

15、yendorsement,atthelatestbyMarch2004,andconflictingnationalstandardsshallbewithdrawnatthelatestby March2004. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, Fra

16、nce,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN13079:2003(E) 4 Introduction Inrespectofpotentialadverseeffectsonthequalityofwaterintendedforhumanconsumption,causedbythe productcoveredbythisstandard

17、: a) thisstandardprovidesnoinformationastowhethertheproductmaybeusedwithoutrestrictioninanymember statesoftheEUorEFTA; b) itshouldbenotedthat,whileawaitingtheadoptionofverifiableEuropeancriteria,existingnationalregulations concerningtheuseand/orthecharacteristicsofthisproductremaininforce.EN13079:20

18、03(E) 5 1Scope ThisEuropeanStandardspecifiesthecharacteristicsandtherequirementsofairgapswithinjectorFamilyA TypeDintendedforprotectionofpotablewaterinwaterinstallationsfrompollution. Thisstandardappliestoairgapsinfactoryassembledproductsandtoconstructedairgapsinsitu,anddefinesthe physicochemicalcha

19、racteristicsofmaterialsofconstructionusedforthepurposeandapplicationtoensure compliancewiththisstandardduringnormalworkinguse. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthet

20、extandthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN1717:2000,Prot

21、ectionagainstpollutionofpotablewaterinwaterinstallationsandgeneralrequirementsof devicestopreventpollutionbybackflow. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thetermsanddefinitionsofEN1717:2000andthefollowingapply. 3.1 airgapwithinjectorFamilyATypeD ADairgapwithinjectorisapermanen

22、tdistancebetweentheupstreamfeedorificeandthedownstreamreceiving orifice NOTE1 Thisdeviceisintendedtoworkinthehorizontalplaneonly. NOTE2 SeeFigure1forthedesignprinciple. Figure1Designprinciple 3.2 diameterofupstreamfeedpipe(bore“D“) diameterDistheinternaldiameteroftheupstreamfeedorificeEN13079:2003(E

23、) 6 4Designation AnairgapwithinjectorFamilyATypeDisdesignatedby: its name; itsfamilyanditstype; itsdenomination(DNorD,see3.2); thereferencetothisstandard. EXAMPLE f AirgapFamilyATypeDDN15,EN13079. 5Symbolization ThegraphicrepresentationoftheairgapwithinjectorFamilyATypeDisasfollows(seeFigure2). Figu

24、re2Graphicsymbol 6Materials Themanufacturershallstatethetypeofmaterialschoseninhistechnicalandcommercialdocuments. Thematerialsusedinwaterinstallations,includingthematerialsofprotectorunitsincontactwithdrinkingwater, shallsatisfytheEuropeanStandardsandnationalacceptancecriteriaand/ornationalrestrict

25、ionsforusecurrently inforceinEUandEFTA. Theyshallbecompatiblewhicheachother,withthewatersupplyandwiththefluidsorsubstancesthatcancome intocontactwiththem. Therearenospecialrequirementsconcerningthematerialsdownstreamoftheatmosphericoutletopening providedtheydonothaveanyharmfuleffectontheupstreampart

26、. 7Requirements 7.1General Theprotectionassemblycomprisesfourpartsintegralwithoneanother: aninjector/upstreamfeedorifice; areceivingdevice/downstreamreceivingorifice;EN13079:2003(E) 7 areceivingvessel(downstreamelement); anairbreaktodrain. 7.2Upstreamfeedorifice Theupstreamfeedorificeoftheinjectorsh

27、alldischargeacrossthehorizontaldistanceA(theairgap). Thesmallestdimensionforcalculatingtheinletsectionshallnotbelessthan4mm.Itshallnotbepossibleforthe injectionorificetobeincontactwithaproductfromdownstream,whetherowingtobackfloworbendingor deformationoftheassembly.Everyfeedpipesupplyingwatertosucha

28、valveassemblyorotherdeviceshallbe fixedinitspositiontopreventitfrommovingorbuckling. 7.3Downstreamreceivingorifice. Thisorificeshallbesizedtoaccommodatethefullflowrateofthefeeditshallbepositionedonthesamehorizontal axisandwilldischargeintothereceivingvessel.Everypipereceivingwaterfromsuchanassemblys

29、hallbefixedin itspositiontopreventitfrommovingorbuckling. 7.4Receivingvessel Thereceivingvesselshallbesopositionedthatwastedwateriskepttoanabsoluteminimumandtoensurethat anywaterreturningduetothemaximumpossiblepositivepressurebackflowdoesnotcomeintocontactwiththe upstreamfeedorifice. 7.5Airbreaktodr

30、ain Theairbreaktodrainshallbecapableofdrainingoffthemaximumflowratewithoutcontactingtheinlet device(injector(s),withallinjectorsdischargingwithaindividualflowrateofQ=0,14D 2 l/min.or,adynamic pressureof1MPa(10bar)iftheflowrateQcannotbeachievedwhenthereceivingvesselfeedpipesareclosed. Theairbeaktodra

31、inshallcomplywiththerequirementsofEN1717. 7.6Airgap(Distance“A“) Theairgapdistanceisthehorizontaldistancebetweentheterminalendoftheupstreamorifice(injector)andthe inletendofthedownstreamreceivingorifice.Thedistance,A,shallnotbelessthanthevalueA 2Dbutnotless than20mm(seeFigure3). Innormalconditionsof

32、use,nosplashingtowardstheoutsideshallbeobserved. Thereshallbenocontactobservedwiththeupstreamcomponentowingtoretention,runoff,splashingordripping fromthedownstreamcomponent.EN13079:2003(E) 8 Key A Airgap 1I n j e c t o r 2 Receivingvessel 3 Upstreamfeedorifice(D) 4 Downstreamreceivingorifice 5 Airbr

33、eaktodrain Figure3AirgapwithinjectorFamilyATypeD 7.7Backflow/Backpressure Ifthereceivingvesselcanbesubjecttopositivepressurebackflow,itisimportantthattheinletorificeispositioned sothatitcannotbecontaminatedbytheascending/returningbackflowfluid.Whentheairgapispartofan installationwhichcangenerateposi

34、tivepressurebackflowitisessentialthatameansoflimitingtheflowratetoa ratewhichwillnotcompromisetheoverflowarrangementwhichisincorporatedi.e.nonreturnvalvefittedupstream ofthepressurisationunit. Potablewaterinletsshallterminateatahigherlevelthannonpotableinletsandnevercloserthan2Dmeasured horizontally

35、andverticallydownward. 7.8Verification 7.8.1General Verificationcanbeachievedbytestandbymeasurements.EN13079:2003(E) 9 7.8.2 Procedureforverificationbymeasurementofair gapA. a)Procedure : measurediameterD; measureairgapA. b)Requirement : theairgapdistanceAshallbe 2Dandneverlessthan20mm. 7.8.3 Proced

36、ureforverificationofairgapdistanceAduringbackflow. (Thistestonlyappliestosituationswherethereceivingvesselismountedhigherthantheairgap) a)Procedure : closealloutlets; fillthedownstreamreceivingvesseltoitsmaximum; individuallytesteachairgapbyopeningtheeachoutlet; noteanycontactwiththeupstreaminletori

37、fice. b)Requirement : nocontactispermittedbetweenthebackflowingwaterandtheupstreaminletorifice. 7.8.4 Procedureforverificationbytestofairbreaktodrain. a)Procedure: closealloutlets; measure diameter(s) D; calculate Q (see 7.5); applyflowrate(s)Q; stopflowrateQ; after2snotecontactwiththedrainingwaterl

38、evelandairinlet(s). Requirement: nocontactispermissiblebetweenthedrainingwaterlevelandtheoutletorifices 8 Marking(notrequiredforsiteconstructedproducts) EachapplianceincorporatinganairgapwithinjectorFamilyATypeDshallbeclearlyandpermanentlymarked andaccessiblyvisible. Markingshallindicate:EN13079:200

39、3(E) 10 a) manufacturersbrandorlogo; b) letterindicatingfamilyandtypeofairgap; c) denomination(DNorD); d) referencetothisstandard; e) temperatureclass. Thefollowinginformationistobegivenwherepossible: a) reference(typeormodel,etc.); b)serial number. 9 Technicaldocuments Themanufacturersdocumentation

40、shallincludetheappropriateinstallationrequirementstoensuretheairgapis notcompromisedincludingpositivepressurebackflow.blankBS EN 13079:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It

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