1、BRITISH STANDARD BS EN 12255-12:2003 Wastewater treatment plants Part 12: Control and automation The European Standard EN 12255-12:2003 has the status of a British Standard ICS 13.060.30 BS EN 12255-12:2003 This British Standard, was published under the authority of the Standards Policy and Strategy
2、 Committee on 26 September 2003 BSI 26 September 2003 ISBN 0 580 42698 X National foreword This British Standard is the official English language version of EN 12255-12:2003. The UK participation in its preparation was entrusted to Technical Committee B/505, Wastewater engineering, which has the res
3、ponsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “
4、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 provisions of a contract. Users are responsible for its correct application. Compliance with
5、 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, or proposals for change, and keep the UK interests informed; monitor related internati
6、onal 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 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments
7、issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN1225512 September2003 ICS13.060.30 Englishversion WastewatertreatmentplantsPart12:Controlandautomation StationsdpurationPartie12:Rgulationet automatisation KlranlagenTeil12:SteuerungundAutomatisierung Thi
8、sEuropeanStandardwasapprovedbyCENon1August2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobt
9、ainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions.
10、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
11、N EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN1225512:2003EEN1225512:2003(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .4 4 G
12、eneralrequirements 5 5 Designrequirementsandautomationconcept 6 5.1 Inputdataforthedesignoftheautomationsystem 6 5.1.1 General6 5.1.2 Instrumentationandautomationsystems 6 5.1.3 Plantoperatingconditions 6 5.2 Automationconcept 7 6 Designandimplementation. .8 6.1 Tendering8 6.1.1 General8 6.1.2 Funct
13、ionaltendering .8 6.1.3 Sectionaltendering. .8 6.2 Basicdesign .9 6.3 Detaildesign. 9 6.4 Implementation,testandtakeover 9 7 Specificationofautomationsystems . .10 7.1 General10 7.2 Requirements .10 Bibliography 15EN1225512:2003(E) 3 Foreword Thisdocument(EN1225512:2003)hasbeenpreparedbyTechnicalCom
14、mitteeCEN/TC 165“Wastewater engineering”,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyMarch2004,andconflictingnationalstandardsshallbewithdrawnatthelatestby March2004. Itisthetwelfthpa
15、rtpreparedbytheWorkingGroupsCEN/TC165/WG42and43relatingtothegeneral requirementsandprocessesfortreatmentplantsforover50PT.EN12255withthegenerictitle“Wastewater treatmentplants”consistsofthefollowingParts: Part1:Generalconstructionprinciples. Part3:Preliminarytreatment. Part4:Primarysettlement. Part5
16、:Lagooningprocesses. Part6:Activatedsludgeprocesses. Part7:Biologicalfixedfilmreactors. Part8:Sludgetreatmentandstorage. Part9:Odourcontrolandventilation. Part10:Safetyprinciples. Part11:Generaldatarequired. Part12:Controlandautomation. Part13:ChemicaltreatmentTreatmentofwastewaterbyprecipitation/fl
17、occulation. Part14:Disinfection. Part15:Measurementoftheoxygentransferincleanwaterinaerationtanksofactivatedsludgeplants. Part16:Physical(mechanical)filtration. NOTE Forrequirementsonpumpinginstallationsatwastewatertreatmentplants,providedinitiallyas Part2:Pumping installationsforwastewatertreatment
18、plants ,seeEN7526 DrainandsewersystemsoutsidebuildingsPart6:Pumping installations. EN122551,EN122553toEN122558andEN1225510andEN1225511wereimplementedtogetherasa Europeanpackage(ResolutionBT152/1998). AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countri
19、esareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN1225512:2003(E) 4 1Scope ThisEuropeanStandardspecifiesrequ
20、irementsforcontrolandautomationsystemsonwastewatertreatment plantsformorethan50PT.Ifnecessary,thecontrolsystemshouldalsobedesignedtocoverthecontrolofsewer systemsinthereceivingareaofthewastewatertreatmentplant. Itspecifiesthenecessaryinformationanddatawhichareneededforthedesignandimplementationofsuc
21、h systemsaswellastheperformancerequirementswithrespecttothehardandsoftware. DifferencesinwastewatertreatmentthroughoutEuropehaveledtoavarietyofsystemsbeingdeveloped.This standardgivesfundamentalinformationaboutthesystems;thisstandardhasnotattemptedtospecifyallavailable systems. Detailedinformationad
22、ditionaltothatcontainedinthisstandardcanbeobtainedbyreferringtothebibliography. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.For dat
23、edreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN1085:1997, WastewatertreatmentVocabulary . EN122551, Wastewat
24、ertreatmentplantsPart1:Generalconstructionprinciples. EN1225511, Wastewatertreatmentplants Part11:Generaldatarequired. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,termsanddefinitionsgiveninEN1 085:1997 andthefollowingapply. 3.1 clientserver computerconfigurationusingoneormoreserversfo
25、rhandlingandstorageofthePVs(see3.10)asdatabaseof theprocess.Theserverstransmitthenecessarydatatotheclientsfortheirspecialapplications 3.2 deltaevent SCADAfunctionality(see3.11),whichinitialisesrecordingofaPV(see3.10)onlywhenithaschangeditsvalueby aspecifiedincrement 3.3 eventcontrolled SCADAfunction
26、ality(see3.11),thatinitialisesrecordingofaPV(see3.10)onlyifaspecifiedbinaryinputisactive 3.4 LAN LocalAreaNetwork 3.5 multitasking thefeaturethatdifferentrunningprograms(tasks)arehandledbytheoperatingsystemquasiparallelintimeso thattheydonotinterferewithoneanotherandeachtaskgetsenoughCPUtimeforsuffi
27、cientperformanceaswell asinterruptsifrequiredEN1225512:2003(E) 5 3.6 multiscreen techniqueforprocessvisualisationusingmorethanonescreenwithonlyoneoperatingconsole(keyboard/ mouse)bymeansofspecialgraphicboards 3.7 OLE ObjectLinkingandEmbedding 3.8 OPC OLE(see3.7)forprocesscontrol 3.9 PLC Programmable
28、LogicControllerforprocessautomationandcontrolfunctions 3.10 PV ProcessVariable,i. e.binaryinput/outpute. g.signal/switch,analogueinput/outpute. g.measurement value/positioningvalue,countervalues,computedvaluesintheautomationsystem,dataimplementedintothe systembymanualinput.ThePVsformthedatabasisofth
29、eautomationsystem 3.11 SCADA SupervisoryControlAndDataAcquisition 3.12 TCP/IP TransmissionControlProtocol/InternetProtocol 3.13 WAN WideAreaNetwork 3.14 watchdog timeoutsignalusedforcontrolofthecyclicCPUprogram 4 Generalrequirements Controlandautomationsystemsareusedtosupporttheoperatorsinmaintainin
30、gprocessqualityandcost efficiencyofthewastewatertreatmentplants.Inadditiontheyservefordocumentationoftheprocess,especiallyto monitorandrecordtheeffluentqualityparametersandasatoolfororganisingthemaintenanceoftheplantitself. Thecontrolsystemshallbeconsideredatanearlyplanningstagewhenevaluatingtheproc
31、essdesignforthe overallprocess.Theoverallcosts,includingtheinvestmentandoperatingexpensesforthecontrolsystemwith respecttovarioustreatmentalternativesshouldbeestimatedandcheckedatthisstage.Accountshallbetakenof thefact,thatasophisticatedcontrolsystemrequiresskilledandtrainedpersonnelformaintenance.T
32、hereforeitis mainlydependentontheplantsizeandprocesscomplexitywhetherasophisticatedcontrolsystemorsimple controlsarerequired. Thedesignshalltakeintoaccounttherequiredmanagementinformationsystem.Incertaincasesitcanbe advantageoustoincorporatethecontroloftheseweragesystem. Thecontrolandautomationconce
33、ptshallbespeciallydesignedforeachwastewatertreatmentplantdependingon thetreatmentprocesses,manninglevelsandskills.Itshouldalsoallowcompliancewiththerequirementsfor reliabilityandtheoperationinspecialsituations,e.g.incaseoffailureofsomecomponents. Controlandautomationsystemsshouldbeconfiguredasanetwo
34、rkofseveralintelligentsubsystemswhichare servedandoperatedbyoneormorecentralcontrolstationsinahierarchicalclientserverarchitecture.Thedesign ofsuchnetworksshallcomplywiththerequirementsondatatransferrate,transmissionprotocolsandthefunctions ofthesubstations.Thecontrolandautomationsystemshouldsupport
35、thecommunicationviainternet,e.g.itshouldEN1225512:2003(E) 6 bepossibletoimplementthewebserverfunctionalitytopresentonlinedataaswellasarchivalinformationinthe webcompatibleformatsviatheweb. Basedonthesebasicconsiderationsforthedesignofcontrolandautomationsystems,inthefollowingclauses requirementsonth
36、enecessaryinformationwithrespecttothesystemdesignandfurthermoretothehardwareand softwarefeaturesofthesystemarecompiled.Afundamentalconceptisgivenforsimpleplants,whichcanbe upgradedtoanetworksystemapplyingtomorecomplexprocessdesign. 5 Designrequirementsandautomationconcept 5.1 Inputdataforthedesignof
37、theautomationsystem 5.1.1General InadditiontothegeneralspecificationsandrequirementsaccordingtoprEN1225511thecustomershallsupply furtherrequirementsasbasisfortheevaluationoftheappropriatedegreeofinstrumentationandtheselectionof therequiredcomponentsofthecontrolandautomationsystemaswellasforthedesign
38、ofthecontrolroom equipment.Theextentofthedataneededvarieswiththerequirementsonplantoperation,onthelevelof automationaswellasonthedocumentstobeproduced,pilingofoperationaldatainlistsorbalances. Theseadditionalrequirementsrefertotheinstrumentationandautomationsystems(see5.1.2)andtheplant operatingcond
39、itions(see5.1.3). 5.1.2 Instrumentationandautomationsystems Thecomplexityoftheplantdesignrelatestothesophisticationofinstrumentationandautomationsystem. Thereforethefollowingrequirementsshouldbespecified: a) Thelevelofinstrumentationforprocesscontrol,e.g.: flow,level,pressure,temperature; forchemica
40、lparameterssuchaspH; conductivity,redox,dissolvedoxygenandturbidity; morecomplexonlinemonitorsforammonia,nitrite,nitrate,phosphate; formixedliquorsuspendedsolids(MLSS). b) strategiesforprovidingdefaultvaluesincaseofmalfunctionorfailureofthetransmitters,e.g.incontrolloops. c) thecontrolloopdesignfora
41、erationfacilities,nitrification,denitrificationandphosphorusremovalcontrolaswell asrecirculationandsludgetreatment. d) advancedcontrolsystemsasmodellingorfuzzycontrolforthedosageofprecipitantorflocculationagents. 5.1.3 Plantoperatingconditions Inadditiontothebasicprocessdesigntheoperationalcondition
42、s,e.g.therequiredeffluentquality,thepower supply,themanningandorganisationofthemaintenanceshallbeconsidered.Thenecessarydatacaninclude: a) requirementsonelectricalpowersupply,emergencypowersupplyandenergymanagementsystemsincluding gasenginepoweredgenerators; b) locationofcontrolroomsontheplantandinf
43、ormationonhowtooperatethedifferentprocessunits; c) specificationofexplosionprotectedareaswithintheplant(seeEN1225510); d) specificationsconcerningplantinfrastructuree.g.telephone,TVsupervision,firealarmsystem;EN1225512:2003(E) 7 e) thenumberofexternalworkingplacesconnectedtothecontrolroom,e.g.inthelaboratoryonsiteorexternal officesandremotenotebookcomputersforserviceandmaintenancepersonnel; f) identificationcodesystemforunits,powerconsumersandmeasuringpointswiththehelpoftagnumbers; g)system requiremen
