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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 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS E
2、N 12255-12:2003 This British Standard, was published under the authority of the Standards Policy and Strategy 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 participa
3、tion in its preparation was entrusted to Technical Committee B/505, Wastewater engineering, which has the responsibility 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 Euro
4、pean 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 purport to include a
5、ll 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 any enquiries
6、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 15 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. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUR
8、OPISCHE NORM EN 12255-12 September 2003 ICS 13.060.30 English version Wastewater treatment plants - Part 12: Control and automation Stations dpuration - Partie 12: Rgulation et automatisation Klranlagen - Teil 12: Steuerung und Automatisierung This European Standard was approved by CEN on 1 August 2
9、003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained
10、 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 translation under the responsibility of a CEN member into its own language and notified to the Management Centre
11、has the same status as the official versions. 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 Uni
12、ted Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12255-12:2
13、003 E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12255-12 :2003 (E) 2 Contents page Foreword3 1Scope 4 2Normative references 4 3Terms and definitions4 4General requirements5 5Design requirements and automation concept 6 5.1Input data
14、 for the design of the automation system6 5.1.1General6 5.1.2Instrumentation and automation systems 6 5.1.3Plant operating conditions6 5.2Automation concept 7 6Design and implementation8 6.1Tendering8 6.1.1General8 6.1.2Functional tendering .8 6.1.3Sectional tendering8 6.2Basic design.9 6.3Detail de
15、sign.9 6.4Implementation, test and take over9 7Specification of automation systems 10 7.1General10 7.2Requirements.10 Bibliography15 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12255-12 :2003 (E) 3 Foreword This document (EN 12255-12:
16、2003) has been prepared by Technical Committee CEN/TC 165 “Wastewater engineering”, 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 or by endorsement, at the latest by March 2004, and conflic
17、ting national standards shall be withdrawn at the latest by March 2004. It is the twelfth part prepared by the Working Groups CEN/TC 165/WG 42 and 43 relating to the general requirements and processes for treatment plants for over 50 PT. EN 12255 with the generic title “Wastewater treatment plants”
18、consists of the following Parts: Part 1: General construction principles. Part 3: Preliminary treatment. Part 4: Primary settlement. Part 5: Lagooning processes. Part 6: Activated sludge processes. Part 7: Biological fixed-film reactors. Part 8: Sludge treatment and storage. Part 9: Odour control an
19、d ventilation. Part 10: Safety principles. Part 11: General data required. Part 12: Control and automation. Part 13: Chemical treatment Treatment of wastewater by precipitation/flocculation. Part 14: Disinfection. Part 15: Measurement of the oxygen transfer in clean water in aeration tanks of activa
20、ted sludge plants. Part 16: Physical (mechanical) filtration. NOTEFor requirements on pumping installations at wastewater treatment plants, provided initially as Part 2: Pumping installations for wastewater treatment plants, see EN 752-6 Drain and sewer systems outside buildings Part 6: Pumping inst
21、allations. EN 12255-1, EN 12255-3 to EN 12255-8 and EN 12255-10 and EN 12255-11 were implemented together as a European package (Resolution BT 152/1998). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Eur
22、opean 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. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:3
23、4 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12255-12 :2003 (E) 4 1 Scope This European Standard specifies requirements for control and automation systems on wastewater treatment plants for more than 50 PT. If necessary, the control system should also be designed to cover the control of sewer sys
24、tems 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 such systems as well as the performance requirements with respect to the hard- and software. Differences in wastewater treatment through
25、out Europe have led to a variety of systems being developed. This standard gives fundamental information about the systems; this standard has not attempted to specify all available systems. Detailed information additional to that contained in this standard can be obtained by referring to the bibliog
26、raphy. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or
27、 revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 1085:1997, Waste water treatment Vocabulary. EN 12255-1, Wastewat
28、er treatment plants Part 1: General construction principles. EN 12255-11, Wastewater treatment plants Part 11: General data required. 3 Terms and definitions For the purposes of this European Standard, terms and definitions given in EN 1085:1997 and the following apply. 3.1 client-server computer co
29、nfiguration using one or more servers for handling and storage of the PVs (see 3.10) as data base of the process. The servers transmit the necessary data to the clients for their special applications 3.2 delta-event SCADA functionality (see 3.11), which initialises recording of a PV (see 3.10) only
30、when it has changed its value by a specified increment 3.3 event-controlled SCADA functionality (see 3.11), that initialises recording of a PV (see 3.10) only if a specified binary input is active 3.4 LAN Local Area Network 3.5 multi-tasking the feature that different running programs (tasks) are ha
31、ndled by the operating system quasi parallel in time so that they do not interfere with one another and each task gets enough CPU-time for sufficient performance as well as interrupts if required Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:34 GMT+00:00 2006, Uncontrolled Copy, (c) B
32、SI EN 12255-12 :2003 (E) 5 3.6 multi-screen technique for process visualisation using more than one screen with only one operating console (keyboard / mouse) by means of special graphic boards 3.7 OLE Object Linking and Embedding 3.8 OPC OLE (see 3.7) for process control 3.9 PLC Programmable Logic C
33、ontroller for process automation and control functions 3.10 PV Process Variable, i. e. binary input/output e. g. signal/switch, analogue input/output e. g. measurement value/positioning value, counter-values, computed values in the automation system, data implemented into the system by manual input.
34、 The PVs form the data basis of the automation system 3.11 SCADA Supervisory Control And Data Acquisition 3.12 TCP/IP Transmission Control Protocol/Internet Protocol 3.13 WAN Wide Area Network 3.14 watch-dog time-out-signal used for control of the cyclic CPU program 4 General requirements Control an
35、d automation systems are used to support the operators in maintaining process quality and cost efficiency of the wastewater treatment plants. In addition they serve for documentation of the process, especially to monitor and record the effluent quality parameters and as a tool for organising the mai
36、ntenance of the plant itself. The control system shall be considered at an early planning stage when evaluating the process design for the overall process. The overall costs, including the investment and operating expenses for the control system with respect to various treatment alternatives should
37、be estimated and checked at this stage. Account shall be taken of the fact, that a sophisticated control system requires skilled and trained personnel for maintenance. Therefore it is mainly dependent on the plant size and process complexity whether a sophisticated control system or simple controls
38、are required. The design shall take into account the required management information system. In certain cases it can be advantageous to incorporate the control of the sewerage system. The control and automation concept shall be specially designed for each wastewater treatment plant depending on the
39、treatment processes, manning levels and skills. It should also allow compliance with the requirements for reliability 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 subsystem
40、s which are served and operated by one or more central control stations in a hierarchical client-server-architecture. The design of such networks shall comply with the requirements on data transfer rate, transmission protocols and the functions of the substations. The control and automation system s
41、hould support the communication via internet, e.g. it should Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12255-12 :2003 (E) 6 be possible to implement the web-server functionality to present on-line data as well as archival informatio
42、n in the web compatible formats via the web. Based on these basic considerations for the design of control and automation systems, in the following clauses requirements on the necessary information with respect to the system design and further more to the hardware and software features of the system
43、 are compiled. A fundamental concept is given for simple plants, which can be upgraded to a network system applying to more complex process design. 5 Design requirements and automation concept 5.1 Input data for the design of the automation system 5.1.1 General In addition to the general specificati
44、ons and requirements according to prEN 12255-11 the customer shall supply further requirements as basis for the evaluation of the appropriate degree of instrumentation and the selection of the required components of the control and automation system as well as for the design of the control room equi
45、pment. The extent of the data needed varies with the requirements on plant operation, on the level of automation 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
46、 5.1.2) and the plant operating conditions (see 5.1.3). 5.1.2 Instrumentation and automation systems The 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 fo
47、r process control, e.g.: flow, level, pressure, temperature; for chemical parameters such as pH; conductivity, redox, dissolved oxygen and turbidity; more complex on-line monitors for ammonia, nitrite, nitrate, phosphate; for mixed liquor suspended solids (MLSS). b) strategies for providing default
48、values in case of malfunction or failure of the transmitters, e. g. in control loops. c) the control loop design for aeration facilities, nitrification, denitrification and phosphorus removal control as well as recirculation and sludge treatment. d) advanced control systems as modelling or fuzzy-con
49、trol for the dosage of precipitant or flocculation agents. 5.1.3 Plant operating conditions In addition to the basic process design the operational conditions, e. g. the required effluent quality, the power supply, the manning and organisation of the maintenance shall be considered. The necessary data can include: a) requirements on electrical power supply, emergency power supply and energy management systems including gas engine powered generators; b) l