1、BRITISH STANDARD BS EN 13078:2003 Devices to prevent pollution by backflow of potable water Air gap with submerged feed incorporating air inlet plus overflow Family A, type C The European Standard EN 13078:2003 has the status of a British Standard ICS 13.060.20; 23.060.99 BS EN 13078:2003 This Briti
2、sh Standard, was published under the authority of the Standards Policy and Strategy Committee on 8 December 2003 BSI 8 December 2003 ISBN 0 580 43024 3 National foreword This British Standard is the official English language version of EN 13078:2003. The UK participation in its preparation was entru
3、sted by Technical Committee B/504, Water 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 interna
4、tional or European publications referred 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 purpor
5、t to include all the necessary provisions 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
6、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. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and
7、 a back cover. 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 EN13078 November2003 ICS13.060.20;23.060.99 Englishversion Devicestopreventpollutio
8、nbybackflowofpotablewaterAir gapwithsubmergedfeedincorporatingairinletplusoverflow FamilyA,typeC Dispositifsdeprotectioncontrelapollutiondeleaupotable parretourSurverseavecalimentationimmerge incorporantuneentredairetuntroppleinFamilleA, typeC SicherungseinrichtungenzumSchutzdesTrinkwassers gegenVer
9、schmutzungdurchRckflieenFreierAuslauf mitbelftetemTauchrohrundberlaufFamilieA,TypC ThisEuropeanStandardwasapprovedbyCENon1September2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalte
10、ration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberin
11、toitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,Swit
12、zerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN13078:2003EEN13078:2003(E) 2 Co
13、ntents page Foreword3 Introduction .4 1 Scope 5 2 Normativereferences 5 3 Termsanddefinitions. .5 4 Symbolization.6 5 Designation.6 6 Materials6 7 Requirements .7 7.1 General7 7.2 Waterinletdevice 7 7.3 Overflowarrangement .7 7.4 Airgap(distance) .7 7.5 Verificationoftheairgap. .8 7.6 Efficiencyofth
14、eairinletorifice. .8 8 Marking(notrequiredforsiteconstructedproducts) 9 9 Technicaldocuments . .9 AnnexA (normative) Vacuumtest .11 A.1 General11 A.2 Principle11 A.3 Apparatus .11 A.4 Procedure .11EN13078:2003(E) 3 Foreword Thisdocument(EN13078:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC164“Water
15、supply”,the secretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyMay2004,andconflictingnationalstandardsshallbewithdrawnatthelatestby May2004. AnnexAisnormative. AccordingtotheCEN/CENELECIntern
16、alRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnite
17、dKingdom.EN13078:2003(E) 4 Introduction Inrespectofpotentialadverseeffectsonthequalityofwaterintendedforhumanconsumption,causedbythe productcoveredbythisstandard: a) thisstandardprovidesnoinformationastowhethertheproductmaybeusedwithoutrestrictioninanyofthe MemberStateoftheEUorEFTA; b) itshouldbenot
18、edthat,whileawaitingtheadoptionofverifiableEuropeancriteria,existingnationalregulations concerningtheuseand/orthecharacteristicsofthisproductremaininforce.EN13078:2003(E) 5 1Scope ThisEuropeanStandardspecifiesthecharacteristicsandtherequirementsofairgapswithsubmergedfeed incorporatingairinletandanov
19、erflow,FamilyA,typeC.Airgapsaredevicesforprotectionofpotablewaterin waterinstallationsfrompollution.Thisstandardappliestoairgapsinfactoryassembledproductsandto constructedairgapsinsituanddefinesthephysicochemicalcharacteristicsofmaterialsofconstructionusedfor thepurposeandapplicationtoensurecomplian
20、cewiththisstandardduringnormalworkinguse. AnnexAspecifiesthevacuumtest. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedrefer
21、ences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN1717:2000,Protectionagainstpollutionofpotablewaterinwaterinstallatio
22、nsandgeneralrequirementsof devicestopreventpollutionbybackflow. EN8371, PressuregaugesPart1:BourdontubepressuregaugesDimensions,metrology,requirementsand testing. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thetermsanddefinitionsgiveninEN1717:2000,andthefollowing apply. 3.1 airgapwith
23、submergedfeedincorporatingairinletplusoverflowFamilyA,typeC “AC“airgapisapermanentandverticaldistancebetweenthelowestpointoftheairinletorificeinthefeedpipe andthecriticalwaterlevelatwhichthecontaineroverflows NOTE SeeFigure1forthedesignprinciple. Figure1Designprinciple 3.2 spilloverlevel levelatwhic
24、hwaterwillstarttooverflowthereceivingvesselwithalloutletsclosed 3.3 criticalwaterlevel physicalorpiezometricleveloftheliquidreachedinanypartoftheappliance2safterclosingthewaterinlet startingfrommaximumfaultlevelEN13078:2003(E) 6 3.4 dimension h heightbetweenthespilloverlevelandthecriticallevel 3.5 m
25、aximumlevel highestwaterlevelHreachedabovethespilloverlevelunderpositivepressurefaultconditionswithalloutlets closed 3.6 splashing whencontaminationfrommicrobiologicalorviralelementsislikelytooccurandwhenmaintainingthemaximum flowrateatthenormaloperationallevel,willcontactbeobservedbetweentheairinle
26、torificeandtheliquidinthe receivingvesselduetothesplashing,foamingorturbulence,theairgapwillbeincreasedtoapointwhereno contactisobserved 3.7 diameteroffeedpipe(bore D) diameter DisthemaximuminternaldiameterfoundwithinthelastmetreofthesupplypipeortheDNoftheinlet connection NOTE Thedimensionisinmillim
27、etres. 4Symbolization ThegraphicrepresentationoftheairgapwithsubmergedfeedincorporatingairinletplusoverflowFamilyA,typeC isasfollows(seeFigure2). Figure2Graphicsymbol 5Designation AnairgapwithsubmergedfeedincorporatingairinletplusoverflowFamilyA,typeCisdesignatedby: name; familyanditstype; denominat
28、ion(see3.7DNorD); referencetothisstandard. EXAMPLE Airgap,EN13078,FamilyA,typeC,DN15. 6Materials Themanufacturershallstatethetypeofmaterialschoseninhistechnicalandcommercialdocuments.EN13078:2003(E) 7 Thematerialsusedinwaterinstallations,includingthematerialsofprotectionunitsincontactwithdrinkingwat
29、er, shallsatisfytheEuropeanStandardsandnationalacceptancecriteriaand/ornationalrestrictionsforusecurrently inforceinEUandEFTA. Theyshallbecompatibleamongthemselves,withthewatersuppliedandwiththefluidsorsubstancesthatcan comeintocontactwiththem. Therearenospecialrequirementsconcerningthematerialsused
30、downstreamoftheatmosphericoutletopening providedtheydonothaveanyharmfuleffectontheupstreampart. 7Requirements 7.1General Theprotectionassemblycomprisesfourpartsintegralwithoneanother: waterinletdevice; receiving vessel (container); airinletorifice; overflow. 7.2 Waterinletdevice Everyfloatoperatedva
31、lveorotherdevice,whichcontrolstheinflowofwatertoreceivingvessel,shallbesecurely andrigidlyfixedtothatvessel. Everyfeedpipesupplyingwatertosuchavalveorotherdeviceshallbefixedinitspositiontopreventitfrom movingorbuckling. Theairinletorificeshallnotcomeintocontactinanywaywithaproductfromdownstream;itsh
32、allalwaysbeabove themaximumlevel H. Adjustableordismantleablejointstosubmergedsupplypipestotheinletdevicearenotpermittedbelowthecritical level.Submergedsupplypipesshallbemadefromcorrosionresistantmaterialsandbepressuretestedaspartof theinletdevice. 7.3 Overflowarrangement Theoverflowarrangementsshal
33、lnotbelessthan19mminternaldiameter. Theoverflowarrangementsshallincludeanairbreakpriortoaconnectiontodrain.Anairbreaktodrainshall complywiththerequirementsofEN1717,excludingWCs. 7.4 Airgap(distance) 7.4.1Single supply ForairgapsFamilyA,typeCthecriticalwaterlevelshallbeestablishedandtheairgapdistance
34、 Ameasuredfrom thelowestpointoftheairinletorificetothecriticalwaterlevelandshallalsosatisfythevacuumtestinannexA (seeFigureA.1).Thedistance Ais 20mmforvalvesnotexceedingG, 25mmforvalvesexceedingGbut notexceedingGand2 DforvalvesexceedingG. Thedistance hisdeterminedbymeasurementofthedepthofwaterabovet
35、hespilloverleveloftheoverflow2s aftertheinflowequalto Q=0,14 D 2 inlitresperminutehasstopped,or,adynamicpressureof1MPa(10bar)has stoppediftheflowrate Qcannotbeachieved,where Distheinletbore(see3.7)andwithalloutletsclosed(exceptEN13078:2003(E) 8 theoverflow)basedonavelocityof3m/s,orthemaximumrecommen
36、dedflowrateformanufacturedappliances whentheflowrateishigherthan Q. 7.4.2 Multiplesupplies Inthecaseofmultiplefeedpipestoasinglevesselhavinganoverflow,thedistanceoftheairgapsforthepotable watersupplyshallbedimension Aabovethecriticalwaterlevel.Thecriticalwaterlevel(3.3)shallbedetermined2 safterstopp
37、ingtheinflowwithallfeedpipesdischargingatanindividualinflowcalculatedat Q=0,14 D 2 .Iftheflow rate Qcannotbeachieved,applyadynamicpressureof1MPa(10bar)onallinlets.Nofeedorificeshallbeless thandistance Aabovethecriticalwaterlevel. Forcalculatingairgap A,use: = 2 2 D A (1) 7.4.3Backflow/Backpressure I
38、fthereceivingvesselcanbesubjecttopositivepressurebackflow,itisimportantthattheinletorificeispositioned sothattheascending/returningbackflowfluidcannotcontaminateit. Whentheairgapispartofaninstallationwhichcangeneratepositivepressurebackflowitisessentialthata meansoflimitingtheflowratetoaratewhichsha
39、llnotcompromisetheoverflowarrangementisincorporated,i.e. nonreturnvalvefittedupstreamofthepressurisationunit. Potablewaterinletsshallterminateatahigherlevelthannonpotableinletsandnevercloserthan2 Dmeasured horizontallyandverticallydownward. 7.5 Verificationoftheairgap Verificationcanbeachievedbytest
40、 a) Procedureforverificationbytest(see7.4.1and7.4.2): Closealloutlets(excepttheoverflow); Identify D; Calculate Q; Applyflowrate Qandmaintainmaximumwaterlevel; Notecontactwithinletdevice(s)airinletorificeduringfillingandatmaximumlevel; Stopflowrate Q; After2sestablishdistance h; Measureairgapbetween
41、distance handlowestpointoftheairinletorifice. b)Requirements: Nocontactbetweenthedownstreamfluidandtheairinletorifice. Themeasuredairgapshallmeettherequirementsofdimension A(see7.4). 7.6 Efficiencyoftheairinletorifice a) ProcedureforvacuumtestisspecifiedinannexA;EN13078:2003(E) 9 b)Requirement. Ther
42、eshallbenobackflow. 8 Marking(notrequiredforsiteconstructedproducts) EachapplianceincorporatinganairgapwithsubmergedfeedincorporatingairinletplusoverflowFamilyA,typeC shallbeclearlyandpermanentlymarkedandaccessiblyvisible. Markingshallindicate: a) Manufacturersbrandorlogo; b) letterindicatingfamilya
43、ndtypeofairgap; c) denomination(DNorD); d) referencetothisEuropeanStandard. Followinginformationtobegivenwherepossible: e) reference(typeormodel,etc.); f) serialnumber. 9 Technicaldocuments Themanufacturersdocumentationshallincludetheappropriateinstallationrequirementstoensurethattheairgap isnotcompromised,includingpositivepressurebackflow.EN13078:2003(E) 10 Key A Airgap(distance) D Internaldiameteroffeedpipe(bo
