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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