1、BRITISH STANDARD Wastewater treatment plants Part 1 : General construction principles The European Standard EN 12255-1:2002 has the status ofa British Standard ICs 13.030.40; 13.060 BS EN 12255-1 12002 Wk present to the responsible European committee any enquiries on the interpretation, or proposals
2、 for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on request to its secretary. Cr oss-r e fer enc e s The British Standards which implement in
3、ternational or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to i
4、nclude all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, th
5、e EN title page, pages 2 to 20, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 5 February 2002 ISBN O 580 39005 5 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12255-1 January 2002 ICs 13.060.30 Engli
6、sh version Wastewater treatment plants - Part 1 : General construction principles Stations dpuration - Partie 1: Principes gnraux de construction Klranlagen - Teil 1 : Allgemeine Baugrundstze This European Standard was approved by CEN on 9 November 2001 CEN members are bound to comply with the CENKE
7、NELEC 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 on application to the Management Centre or to any C
8、EN 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 has the same status as the official versions. CEN me
9、mbers are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE
10、 FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12255-1:2002 E EN 12255-1 12002 (E) Contents page Foreword 3 1 2 3 4 4.1 4.2 4
11、.3 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.6 4.3.7 4.3.8 4.3.9 4.4 4.4.1 4.4.2 4.4.3 4.4.4 4.4.5 4.4.6 5 5.1 5.2 5.3 5.4 Scope 5 Normative references 5 Terms and definitions 6 Requirements . 7 General requirements 7 Design requirements . 8 Structural requirements 8 General 8 Dimensional tolerances . 9 Con
12、crete tracks 9 Fixings and connections between equipment and structures 9 Access . 9 Building ventilation 10 Water supply and drainage . IO Lifting equipment . 10 Storage for hazardous chemicals and fuels . IO Requirements for equipment 10 Principles for mechanical design . 10 General design require
13、ments . 11 Environmental impact . 15 Safety 15 Documentation . 15 Spare parts. special tools . 15 Test methods 15 Function and performance 15 Tightness testing of concrete structures 16 Tightness testing of earthen basins 16 Tightness testing of other structures and equipment . 16 Annex A (informati
14、ve) Explanatory notes 17 Annex B (normative) Structural tolerances . 19 B.l Circular tank . 19 B.l.l Circular tank with scraper . 19 B.1.2 Circular tank with a scraper bridge travelling on the side wall (track) . 19 B.2 Rectangular tank 19 Bibliography 20 2 EN 12255-1 12002 (E) Foreword This Europea
15、n Standard 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 July 2002, and con
16、flicting national standards shall be withdrawn at the latest by December 2002. It is the first part prepared by the Working Groups CEN/TC 165NVG 42 and 43 relating to the general requirements and processes for treatment plants for a total number of inhabitants and population equivalents (PT) over 50
17、. The parts of the series are as follows: - 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
18、9: Odour control and ventilation - Part 1 O: 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 wate
19、r in aeration tanks of activated sludge plants - Part 16: Physical (mechanical) filtration NOTE For 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 outsid
20、e buildings - Part 6: Pumping installations“. The parts 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 232/2001 taken by CEN/TC 165). 1) in preparation 3 EN 12255-1 12002 (E) This European standard is limited to genera
21、l construction principles. Separate standards for special construction principles for elements of wastewater treatment plants are covered in other parts. Safety principles and general data required are covered in EN 12255-10 and EN 12255-11 Annex A is informative. annex B is normative. According to
22、the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this document: Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain
23、, Sweden, Switzerland and the United Kingdom. 4 EN 12255-1 12002 (E) 1 Scope This European Standard specifies general requirements for structures and equipment as they relate to wastewater treatment plants for a total population of more than 50 PT. The primary application is designed for wastewater
24、treatment plants for the treatment of domestic and municipal wastewater. Requirements for structures which are not specific for wastewater treatment plants are not within the scope of this European Standard. Other ENS can apply. Equipment which is not solely used in wastewater treatment plants is su
25、bject to the applicable product standards. However, specific requirements for such equipment when used in wastewater treatment plants are included in this part. General principles of building construction, mechanical and electrical engineering are not subject of this standard. This European Standard
26、 does not cover the design of treatment processes. Differences in wastewater treatment throughout 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 informa
27、tion additional to that contained in this standard may be obtained by referring to the Bibliography. 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 tex
28、t, and the publications are listed hereafter. For dated references, subsequent amendments to or 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 appli
29、es (including amendments). EN 752-6, Drain and sewer systems outside buildings - Part 6: Pumping installations. EN 809, Pumps and pump units for liquids - Common safety requirements. EN 1085, Wastewater treatment - Vocabulary. EN 12255-9, Wastewater treatment plants - Part 9: Odour control and venti
30、lation. EN 12255-1 O, Wastewater treatment plants - Part IO: Safety principles. prEN 12255-12, Wastewater treatment plants - Part 12: Control and automation. EN 60034-1, Rotating electrical machines - Part I: Rating and performance (IEC 60034- I: 1996, modified). EN 60529, Degrees of protection prov
31、ided by enclosures (IP code) (IEC 60529: 1989). IS0 3506- 1 , Mechanical properties of corrosion-resistant stainless-steel fasteners - Part I: Bolts, screws and studs. IS0 3506-2, Mechanical properties of corrosion-resistant stainless-steel fasteners - Part 2: Nuts. IS0 3506-3, Mechanical properties
32、 of corrosion-resistant stainless-steel fasteners - Part 3: Set screws and similar fasteners not under tensile stress. IS0 4200, Plain end steel tubes, welded and seamless - General tables of dimensions and masses per unit length. 5 EN 12255-1 12002 (E) 3 Terms and definitions For the purposes of th
33、is European Standard, the terms and definitions given in EN 1085 and the following apply. 3.1 st ru ct u re any construction and its components built for the accommodation of equipment 3.2 equipment any component which is installed in, mounted on, attached to, or operated on structures, in the perfo
34、rmance of their intended function 3.3 unit any structure including any related equipment which is used as a process stage and which can be isolated from other parallel, upstream or downstream structures NOTE Examples for a unit are a grit chamber, a clarifier, an aeration tank, a thickener, a digest
35、er. 3.4 assembly mechanical equipment that can be removed and replaced as a whole NOTE Examples for an assembly are a pump, a compressor, a gas engine, an aerator 3.5 wastewater treatment plant system for the purification of wastewater including structures and equipment 3.6 client municipality, city
36、 or other organisation which intents to built a wastewater treatment plant or parts thereof, or its representative 3.7 Bidder company or other organisation which offers to built a plant, or to built or supply parts thereof 3.8 contractor company or organisation which received a contract to built a p
37、lant, or to built or supply parts thereof 3.9 tracks those parts of a structure on which wheels run 3.10 design loading YN effective average loading in continuous operation under full load NOTE given load. It is greater than or equal to the value of the operating loading which, for example, fluctuat
38、es as a function of the 3.1 1 continuous load bearing capacity Yc load bearing capacity in continuous operation under full load 3.12 maximum loading Y, peak loading which is taken as the switch-off value to which, for example, overload circuit breakers are adjusted 6 EN 12255-1 12002 (E) 3.13 maximu
39、m load bearing capacity YB highest possible load bearing capacity limited to short-term load peaks, such as occur on switching on and off NOTE as required, YN and Y, being stated by the equipment supplier. In addition, alarm loadings YS, lying between the design loading YN and the switch-off loading
40、 Y, can be agreed 3.14 utilisation factor KA parameter for the effects on drive units etc., intrinsic to their operation NOTE overall value of the relationship between load bearing capacity and loading. Usually KA includes either directly or indirectly information on the loading, running time and te
41、mperature and is an 3.15 design service life *) operating time until break-down of a machinery element under design loading, which is reached by a certain percentage of the elements tested NOTE - as an example, the percentage for rolling bearings is 90 %; - the design service life is different from
42、both the warranty time and an average service life of use, as used for cost efficiency calculations. 3.16 mode of operation characteristic value related to the effects on motors and other electrical components intrinsic to their operation (e.g. frequency of starts, temperatures) 3.17 degree of prote
43、ction characteristic value related to the effects on motors and other electrical components intrinsic to their environmental conditions (e.g. effects of water or dust) 4 Requirements 4.1 General requirements Wastewater treatment plants shall meet the following requirements: a) national regulations s
44、hall be observed; b) the discharge limits shall be met; c) be capable of satisfactory treatment of the full range of flows and loads; d) personal safety; e) nuisance, odour, noise and toxicity, aerosols and foam shall be considered and shall meet the relevant requirements according to EN 12255-9 and
45、 EN 12255-10; f) danger to operating personnel shall be minimized; *) Explanatory note see annex A 7 EN 12255-1 12002 (E) g) the required service life and long term structural integrity shall be achieved, including water and gas; h) tightness; i) provisions shall be made for case of operation and ma
46、intenance; j) provision for future extensions or modifications of the plant shall be considered; k) the reliability of operation shall be high and risk of danger and the impact of malfunctions shall be limited; I) be cost effective in respect of total costs (capital and operating costs); m) the ener
47、gy consumption during construction and operation shall be considered; n) the waste products shall be reduced in quantity and improved in quality as far as reasonably achievable to allow for reuse or safe disposal. 4.2 Design requirements The following requirements shall be considered during the desi
48、gn stage of a wastewater treatment plant: All assemblies that are subject to occasional failure (e.g. pumps and compressors) shall be installed with sufficient stand-by capacity so as to achieve full treatment capacity and efficiency with one assembly out of service. In the case where stand-by assem
49、blies cannot be practically installed, provisions shall be made to replace rapidly by another one kept in stock. Where practicable and necessary for maintenance work it shall be possible to bypass every unit or assembly, either by a parallel unit or assembly, channel or pipe. Where necessary the inlet to the treatment plant shall include a facility which limits the flow. Such facilities may be balancing tanks and/or stormwater overflows as required by the authorities. Where power supply is subject to prolonged interruption, wastewater treatment plants shall have emergency
