1、BRITISH STANDARD BS EN 13076:2003 Devices to prevent pollution by backflow of potable water Unrestricted air gap Family A Type A The European Standard EN 13076:2003 has the status of a British Standard ICS 13.060.20; 23.060.01 BS EN 13076:2003 This British Standard was published under the authority
2、of the Standards Policy and Strategy Committee on 1 April 2003 BSI 1 April 2003 ISBN 0 580 41476 0 National foreword This British Standard is the official English language version of EN 13076:2003. Together with BS EN 13077, when published, it supersedes BS 6281-1:1992 which will be withdrawn. The U
3、K participation in its preparation was entrusted by Technical Committee B/504, Water supply, to Subcommittee B/504/4, Backflow prevention, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The Briti
4、sh Standards which implement international 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 Onli
5、ne. This publication does not purport 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 responsib
6、le international/European committee 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,
7、the EN title page, pages 2 to 10, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN13076 March2003 ICS13.060
8、.20;23.060.01 Englishversion Devicestopreventpollutionbybackflowofpotablewater UnrestrictedairgapFamilyATypeA Dispositifsdeprotectioncontrelapollutiondeleau potabbleparretourSurversetotaleFamilleATypeA SicherungseinrichtungenzumSchutzdesTrinkwassers gegenVerschmutzungdurchRckflieenUngehinderter frei
9、erAuslaufFamilieATypA,FreieAuslufeTypAA ThisEuropeanStandardwasapprovedbyCENon28November2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalrefer
10、encesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementC
11、entrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTE
12、EFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN13076:2003EEN13076:2003(E) 2 Contents page Foreword3 Introduction .4 1 Sco
13、pe 5 2 Normativereferences 5 3 Termsanddefinitions. .5 4 Designation.6 5 Symbolization.6 6 Materials6 7 Requirements .7 7.1 General7 7.2 Waterinletdevice 7 7.3 Airgap(distanceA) .9 8 Marking(notrequiredforsiteconstructedproducts) 10 9 Technicaldocuments . .10EN13076:2003(E) 3 Foreword Thisdocument(E
14、N13076:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC164,“Watersupply“,the secretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbySeptember2003,andconflictingnationalstandardsshallbewithdrawnatth
15、e latestbySeptember2003. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norwa
16、y,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN13076:2003(E) 4 Introduction Inrespectofpotentialadverseeffectsonthequalityofwaterintendedforhumanconsumption,causedbythe productcoveredbythisstandard: a) thisstandardprovidesnoinformationastowhethertheproductmaybeusedwithoutrestrict
17、ioninanymember statesoftheEUorEFTA; b) itshouldbenotedthat,whileawaitingtheadoptionofverifiableEuropeancriteria,existingnationalregulations concerningtheuseand/orthecharacteristicsofthisproductremaininforce.EN13076:2003(E) 5 1Scope ThisEuropeanstandardspecifiesthecharacteristicsandtherequirementsofu
18、nrestrictedairgapsFamilyATypeA intendedforprotectionofpotablewaterinwaterinstallationsfrompollution. Thisstandardappliestoairgapsinfactoryassembledproductsandtoconstructedairgapsinsitu,anddefinesthe physicochemicalcharacteristicsofmaterialsofconstructionusedforthepurposeandapplicationtoensure compli
19、ancewiththisstandardduringnormalworkinguse. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoo
20、rrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN1717:2000,Protectionagainstpollutionofpotablewaterinwaterinstallationsandgeneralrequirementsof de
21、vicestopreventpollutionbybackflow. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thetermsanddefinitionsofEN1717:2000andthefollowingterms anddefinitionsapply. 3.1 unrestrictedairgapFamilyATypeA AAairgapisavisible,unobstructedandcompleteairgap,placedpermanentlyandverticallybetweenthelowes
22、t pointofthefeedinletorificeandsurfaceofthereceivingvesselthatdeterminesthemaximumoperationallevelat whichthedeviceoverflows NOTE SeeFigure1forthedesignprinciple. Figure1Designprinciple 3.2 spilloverlevel levelatwhichwaterwillstarttooverflowthereceivingvesselwithalloutletsclosed 3.3 diameteroffeedpi
23、pe(bore“D“) diameterDisthemaximuminternaldiameterfoundwithinthelastmetreofthesupplypipeortheDNoftheinlet connection NOTEthedimensionisinmillimetres.EN13076:2003(E) 6 3.4 maximumlevel highestwaterlevelHreachedabovethespilloverlevelunderpositivepressurefaultconditionwithalloutlets closed 3.5 splashing
24、 whencontaminationfrommicrobiologicalorviralelementsislikelytooccurandwhenmaintainingthemaximum flowrateatthenormaloperationalwaterlevel,willcontactbeobservedbetweentheupstreamcomponents,and theliquidinthereceivingvesselduetothesplashing,foamingorturbulence,theairgapwillbeincreasedtoapoint wherenoco
25、ntactisobserved 4Designation AnunrestrictedairgapFamilyATypeAisdesignatedby: its name; itsfamilyanditstype; itsdenomination(see3.3DNorD); thereferencetothisstandard. EXAMPLE foradesignation AirgapFamilyATypeADN15,EN13076. 5Symbolization ThegraphicrepresentationoftheunrestrictedairgapFamilyATypeAisas
26、follows(seeFigure2). Figure2Graphicsymbol 6Materials Themanufacturershallstatethetypeofmaterialschoseninhistechnicalandcommercialdocuments. Thematerialsusedinwaterinstallations,includingthematerialsofprotectionunitsincontactwithdrinkingwater, shallsatisfytheEuropeanstandardsandnationalacceptancecrit
27、eriaand/ornationalrestrictionsforusecurrently inforceinEUandEFTA. Theyshallbecompatiblewitheachother,withthewatersupplyandwiththefluidsorsubstancesthatcancomein contactwiththem. Therearenospecialrequirementsconcerningthematerialsdownstreamoftheatmosphericoutletopening providedtheydonothaveanyharmful
28、effectontheupstreampart.EN13076:2003(E) 7 7Requirements 7.1General Theprotectionassemblycomprisestwoparts: awaterinletdevice; a receiving vessel (container). Thefeedpipeandanyflowcontroldeviceshallbeexternaltoanyofthereceivingvesselwalls.Theassemblyshall befixedsothattheairgapispermanentlymaintained
29、andunrestricted. 7.2 Waterinletdevice a) everyfloatoperatedvalveorotherdevicewhichcontrolstheinflowofwatertoareceivingvesselshallbe securelyandrigidlyfixed; b) everyfeedpipesupplyingwatertosuchavalveorotherdeviceshallbefixedinitspositiontopreventitfrom movingorbuckling; c) thedirectionofflowfromafee
30、dpipeintothereceivingvesselshallbeintoairatatmosphericpressure, downwardsandnotmorethan15fromthevertical; d) thedischargefromthefeedpipeshallnotbecompromisedbyanyobjectwithin2D,measuredhorizontally andverticallydownward(seeFigure4). Wherenoncircularpipesareused,theboreshallbetakenastheinternaldiamet
31、erofacircularpipehavingthe samecrosssectionalareasasthenoncircularpipe.EN13076:2003(E) 8 Key A Airgab H Maximumlevel D Internaldiameteroffeedpipe(bore) 1 Feedpipe 2 Feedorifice 3 Receivingvessel 4 Spilloverlevel 5 15maximumfromthevertical Figure3UnrestrictedairgapFamilyATypeAEN13076:2003(E) 9 Key 1
32、15maximumfromthevertical Figure4UnrestrictedairgapFamilyATypeA 7.3 Airgap(distanceA) 7.3.1Single supply Inthecaseofasinglesupplypipetoasinglevesselhavingacontinuous,unobstructedoverflowaroundthetop, thedistance,A,shallnotbelessthanthevalueA 2Dbutnotlessthan20mm.(SeeFigure3). 7.3.2 Multiplesupplies I
33、nthecaseofmultiplefeedpipestoasinglevesselhavingacontinuousunobstructedoverflowaroundthe spillover,thedistance,A,shallnotbelessthanthevalueA 2timesthetotalsumofallinletborediameters(D), butnotlessthan20mm.EN13076:2003(E) 10 7.3.3 Vesselshavingavariableheightrimcanbeassessedagainstthisstandardonlyif:
34、 theycanbetestedinamaximumpositivefaultcondition,and theairgapbetweenthemaximumlevelandtheinletdeviceoutletcanbemaintained. Themaximumlevelisdeterminedbymeasurementofthedepthofwaterabovethespilloverlevel,withtheinflow withallfeedpipesdischarchingatanindividualinflowcalculatedatQ=0,14D 2 inlitresperm
35、inute,oradynamic pressureof1MPa(10bar)ifflowrate(s)Qcannotbeachieved.WhereDistheboreofsupplypipe,andwithall outletsincludingoptionalwarningpipesclosed,basedonavelocityof3m/sorthemaximumrecommendedflow rateformanufacturedapplianceswhentheflowrateishigherthanQ. 7.3.4Backflow/Back pressure Ifthereceivi
36、ngvesselcanbesubjecttopositivepressurebackflow,itisimportantthattheinletorificeispositioned sothatitcannotbecontaminatedbytheascending/returningbackflowfluid.Whentheairgapispartofan installationwhichcangeneratepositivepressurebackflowitisessentialthatameansoflimitingtheflowratetoa ratewhichwillnotco
37、mpromisetheoverflowarrangementwhichisincorporatedi.e.nonreturnvalvefittedupstream ofthepressurisationunit. 8 Marking(notrequiredforsiteconstructedproducts) EachapplianceincorporatinganunrestrictedairgapFamilyATypeAshallbeclearlyandpermanentlymarkedand accessiblyvisible. Markingshallindicate: a) manu
38、facturersbrandorlogo; b) letterindicatingfamilyandtypeofairgap; c) denomination(DNorD); d) referencetothisstandard. Followinginformationtobegivenwherepossible: a) reference(typeormodel,etc.); b)serial number. 9 Technicaldocuments Themanufacturersdocumentationshallincludetheappropriateinstallationreq
39、uirementstoensuretheairgapis notcompromisedincludingpositivepressurebackflow.blankBS EN 13076:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Euro
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