EN 12255-12:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.L]DFLMDKläranlagen - Teil 12: Steuerung und AutomatisierungStations d'épuration - Partie 12: Régulation et automatisationWastewater treatment plants - Part 12: Control and automation13.060.30Odpadna vodaSewage waterICS:Ta slovenski standard je istoveten z:EN 12255-12:2003SIST EN 12255-12:2004en01-maj-2004SIST EN 12255-12:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12255-12September 2003ICS 13.060.30English versionWastewater treatment plants - Part 12: Control and automationStations d'épuration - Partie 12: Régulation etautomatisationKläranlagen - Teil 12: Steuerung und AutomatisierungThis European Standard was approved by CEN on 1 August 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12255-12:2003 ESIST EN 12255-12:2004

EN 12255-12 :2003 (E)2ContentspageForeword.31Scope.42Normative references.43Terms and definitions.44General requirements.55Design requirements and automation concept.65.1Input data for the design of the automation system.65.1.1General.65.1.2Instrumentation and automation systems.65.1.3Plant operating conditions.65.2Automation concept.76Design and implementation.86.1Tendering.86.1.1General.86.1.2Functional tendering.86.1.3Sectional tendering.86.2Basic design.96.3Detail design.96.4Implementation, test and take over.97Specification of automation systems.107.1General.107.2Requirements.10Bibliography.15SIST EN 12255-12:2004

EN 12255-12 :2003 (E)3ForewordThis document (EN 12255-12:2003) has been prepared by Technical Committee CEN/TC 165 “Wastewaterengineering”, the secretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by March 2004, and conflicting national standards shall be withdrawn at the latest byMarch 2004.It is the twelfth part prepared by the Working Groups CEN/TC 165/WG 42 and 43 relating to the generalrequirements and processes for treatment plants for over 50 PT. EN 12255 with the generic title “Wastewatertreatment plants” consists of the following Parts:¾ Part 1: General construction principles.¾ Part 3: Preliminary treatment.¾ Part 4: Primary settlement.¾ Part 5: Lagooning processes.¾ Part 6: Activated sludge processes.¾ Part 7: Biological fixed-film reactors.¾ Part 8: Sludge treatment and storage.¾ Part 9: Odour control and ventilation.¾ Part 10: Safety principles.¾ Part 11: General data required.¾ Part 12: Control and automation.¾ Part 13: Chemical treatment — Treatment of wastewater by precipitation/flocculation.¾ Part 14: Disinfection.¾ Part 15: Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants.¾ Part 16: Physical (mechanical) filtration.NOTEFor requirements on pumping installations at wastewater treatment plants, provided initially as Part 2: Pumpinginstallations for wastewater treatment plants, see EN 752-6 Drain and sewer systems outside buildings — Part 6: Pumpinginstallations.EN 12255-1, EN 12255-3 to EN 12255-8 and EN 12255-10 and EN 12255-11 were implemented together as aEuropean package (Resolution BT 152/1998).According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 12255-12:2004

EN 12255-12 :2003 (E)41 ScopeThis European Standard specifies requirements for control and automation systems on wastewater treatmentplants for more than 50 PT. If necessary, the control system should also be designed to cover the control of sewersystems in the receiving area of the wastewater treatment plant.It specifies the necessary information and data which are needed for the design and implementation of suchsystems as well as the performance requirements with respect to the hard- and software.Differences in wastewater treatment throughout Europe have led to a variety of systems being developed. Thisstandard gives fundamental information about the systems; this standard has not attempted to specify all availablesystems.Detailed information additional to that contained in this standard can be obtained by referring to the bibliography.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 1085:1997, Waste water treatment — Vocabulary.EN 12255-1, Wastewater treatment plants — Part 1: General construction principles.EN 12255-11, Wastewater treatment plants — Part 11: General data required.3 Terms and definitionsFor the purposes of this European Standard, terms and definitions given in EN 1085:1997 and the following apply.3.1client-servercomputer configuration using one or more servers for handling and storage of the PVs (see 3.10) as data base ofthe process. The servers transmit the necessary data to the clients for their special applications3.2delta-eventSCADA functionality (see 3.11), which initialises recording of a PV (see 3.10) only when it has changed its value bya specified increment3.3event-controlledSCADA functionality (see 3.11), that initialises recording of a PV (see 3.10) only if a specified binary input is active3.4LANLocal Area Network3.5multi-taskingthe feature that different running programs ('tasks') are handled by the operating system quasi parallel in time sothat they do not interfere with one another and each task gets enough CPU-time for sufficient performance as wellas interrupts if requiredSIST EN 12255-12:2004

EN 12255-12 :2003 (E)53.6multi-screentechnique for process visualisation using more than one screen with only one operating console (keyboard /mouse) by means of special graphic boards3.7OLEObject Linking and Embedding3.8OPCOLE (see 3.7) for process control3.9PLCProgrammable Logic Controller for process automation and control functions3.10PVProcess Variable, i. e. binary input/output e. g. signal/switch, analogue input/output e. g. measurementvalue/positioning value, counter-values, computed values in the automation system, data implemented into thesystem by manual input. The PV's form the data basis of the automation system3.11SCADASupervisory Control And Data Acquisition3.12TCP/IPTransmission Control Protocol/Internet Protocol3.13WANWide Area Network3.14watch-dogtime-out-signal used for control of the cyclic CPU program4 General requirementsControl and automation systems are used to support the operators in maintaining process quality and costefficiency of the wastewater treatment plants. In addition they serve for documentation of the process, especially tomonitor and record the effluent quality parameters and as a tool for organising the maintenance of the plant itself.The control system shall be considered at an early planning stage when evaluating the process design for theoverall process. The overall costs, including the investment and operating expenses for the control system withrespect to various treatment alternatives should be estimated and checked at this stage. Account shall be taken ofthe fact, that a sophisticated control system requires skilled and trained personnel for maintenance. Therefore it ismainly dependent on the plant size and process complexity whether a sophisticated control system or simplecontrols are required.The design shall take into account the required management information system. In certain cases it can beadvantageous to incorporate the control of the sewerage system.The control and automation concept shall be specially designed for each wastewater treatment plant depending onthe treatment processes, manning levels and skills. It should also allow compliance with the requirements forreliability and the operation in special situations, e.g. in case of failure of some components.Control and automation systems should be configured as a network of several intelligent subsystems which areserved and operated by one or more central control stations in a hierarchical client-server-architecture. The designof such networks shall comply with the requirements on data transfer rate, transmission protocols and the functionsof the substations. The control and automation system should support the communication via internet, e.g. it shouldSIST EN 12255-12:2004

EN 12255-12 :2003 (E)6be possible to implement the web-server functionality to present on-line data as well as archival information in theweb compatible formats via the web.Based on these basic considerations for the design of control and automation systems, in the following clausesrequirements on the necessary information with respect to the system design and further more to the hardware andsoftware features of the system are compiled. A fundamental concept is given for simple plants, which can beupgraded to a network system applying to more complex process design.5 Design requirements and automation concept5.1 Input data for the design of the automation system5.1.1 GeneralIn addition to the general specifications and requirements according to prEN 12255-11 the customer shall supplyfurther requirements as basis for the evaluation of the appropriate degree of instrumentation and the selection ofthe required components of the control and automation system as well as for the design of the control roomequipment. The extent of the data needed varies with the requirements on plant operation, on the level ofautomation as well as on the documents to be produced, i.e. compiling of operational data in lists or balances.These additional requirements refer to the instrumentation and automation systems (see 5.1.2) and the plantoperating conditions (see 5.1.3).5.1.2 Instrumentation and automation systemsThe complexity of the plant design relates to the sophistication of instrumentation and automation system.Therefore the following requirements should be specified:a) The level of instrumentation for process control, e.g.:¾ flow, level, pressure, temperature;¾ for chemical parameters such as pH;¾ conductivity, redox, dissolved oxygen and turbidity;¾ more complex on-line monitors for ammonia, nitrite, nitrate, phosphate;¾ for mixed liquor suspended solids (MLSS).b) strategies for
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