1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12255-10:2001 The E
2、uropean Standard EN 12255-10:2000 has the status of a British Standard ICS 13.060.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Wastewater treatment plants Part 10: Safety principlesThis British Standard, having been prepared under the direction of the Sector Committee fo
3、r Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 February 2001 BSI 02-2001 ISBN 0 580 37064 X BS EN 12255-10:2001 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard is the offici
4、al English language version of EN 12255-10:2000. The UK participation in its preparation was entrusted by Technical Committee B/505, Wastewater engineering, to Subcommittee B/505/40, Wastewater treatment plants, which has the responsibility to: aid enquirers to understand the text; present to the re
5、sponsible 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. A list of organizations represented on this subcommittee can be obtained on request to
6、 its secretary. Cross-references The British Standards which implement international 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
7、 Standards Electronic Catalogue. A British Standard does not purport to include 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
8、of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 17 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12255-10 December 2000 ICS 13
9、.060.30 English version Wastewater treatment plants Part 10: Safety principles Stations dpuration Partie 10: Principes de scurit Klranlagen Teil 10: Sicherheitstechnische Baugrundstze This European Standard was approved by CEN on 27 October 2000. CEN members are bound to comply with the CEN/CENELEC
10、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 CEN mem
11、ber. 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 members
12、are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION E
13、UROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12255-10:2000 EPage 2 EN 12255-10:2000 BSI 02-2001 Contents Page Foreword . 3 1 Scope 4 2 Nor
14、mative references 4 3 Terms and definitions . 4 4 General requirements . 5 4.1 Confined spaces, hazards and warning systems 5 4.2 Vehicular and pedestrian traffic routes 6 4.3 Fixed ladders, manhole steps and staircases . 7 4.4 Manholes 7 4.5 Falling preventions and covers 7 4.6 Emergency exits . 8
15、4.7 Work places, work platforms and maintenance platforms . 8 4.8 Lifting equipment 9 4.9 Ventilation . 9 4.10 Areas at risk from explosions . 9 4.11 Hygienic facilities 10 4.12 General warning signs 10 5 Special requirements 11 5.1 Systems for separating solids from wastewater 11 5.2 Wastewater pum
16、ping stations 11 5.3 Aeration tanks 11 5.4 Digestion tanks, low-pressure gas holders . 12 5.5 Digester gas pipes . 12 5.6 Desulphurizing plants 13 5.7 Gas engine rooms and gas engines . 13 5.8 Gas flares . 13 5.9 Sludge dewatering . 13 5.10 Installations for storage and handling of chemicals and haz
17、ardous substances . 14 Annex A (informative) 15 Bibliography 16Page 3 EN 12255-10:2000 BSI 02-2001 Foreword This European Standard has been prepared by Technical Committee CEN/TC 165, Waste water engineering, the Secretariat of which is held by DIN. This European Standard shall be given the status o
18、f a national standard, either by publication of an identical text or by endorsement, at the latest by June 2001, and conflicting national standards shall be withdrawn at the latest by December 2001. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the follow
19、ing countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This document is the tenth part prepared by
20、 the working groups CEN/TC 165/WG 42 and WG 43 relating to general requirements and processes for wastewater treatment plants for more than 50 PT. The parts of these series are as follows: Part 1: General construction principles Part 3: Preliminary treatment Part 4: Primary settlement Part 5: Lagoon
21、ing processes Part 6: Activated sludge processes Part 7: Biological fixed-film reactors Part 8: Sludge treatment and storage Part 9: Odour control and ventilation Part 10: Safety principles Part 11: General data required Part 12: Control and automatization 1) Part 13: Chemical treatment Part 14: Dis
22、infection 1) Part 15: Measurement of the oxygen transfer in clean water in activated sludge aeration tanks Part 16: Physical (mechanical) filtration 1) NOTE: For requirements on pumping installations at wastewater treatment plants, provided initially as Part 2: Pumping installations for wastewater t
23、reatment plants, see EN 752-6 Drain and sewer systems outside buildings Part 6: Pumping installations. This European Standard sets rules for general minimum requirements only. Special safety requirements are defined in the national standards concerned. The parts EN 12255-1, EN 12255-3 to EN 12255-8,
24、 EN 12255-10 and EN 12255-11 became implemented together as a European package (Resolution BT 152/1998). The date of withdrawal (dow) of all conflicting national standards is 2001-12-31. Until the date of withdrawal is reached, the National and the already published European standards both coexist.1
25、)in preparationPage 4 EN 12255-10:2000 BSI 02-2001 1 Scope This European Standard is for the protection of employees and defines safety requirements for wastewater treatment plants to be constructed or reconstructed as follows: for structures and parts of structures where safety factors have to be t
26、aken into account; all components of the technical equipment, as far as safety requirements have to be observed in the planning and construction of these parts of the plant. It may be possible that national regulations exceed the requirements laid down in this standard. In this case these requiremen
27、ts shall be precisely described. Special safety requirements, e.g. in the fields of electrical and mechanical engineering which are dealt with in other regulations, shall be observed although they are not mentioned specifically in this standard. This standard is of relevance only to new wastewater t
28、reatment plants and new parts for existing plants designed and constructed after the effective date. This standard is not to be applied retrospectively to existing plants. Detailed information additional to that contained in this standard may be obtained by referring to the bibliography. 2 Normative
29、 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 revisions of any
30、 of these publications apply to this 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 124, Gully tops and manhole tops for vehicular and pedestrian areas Design requirements, ty
31、pe testing, marking, quality control. EN 476, General requirements for components used in discharge pipes, drains and sewers for gravity systems. EN 752-6, Drain and sewer systems outside buildings Part 6: Pumping installations. EN 1085, Wastewater treatment Vocabulary. prEN 12255-1:1996, Wastewater
32、 treatment plants Part 1: General construction principles. 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 1085 and the following apply. 3.1 sewerage within a wastewater treatment plant all structures used for collecting, draining or storing
33、of wastewater within a wastewater treatment plant NOTE: Sewerage within a wastewater treatment plant includes: open and closed channels; pumping stations; storm water drainage and treatment systems. 3.2 wastewater treatment plant facility for the physical, biological and chemical treatment of wastew
34、ater inclusive of all facilities for the treatment of solid wastes (screenings, grit, sludge)Page 5 EN 12255-10:2000 BSI 02-2001 3.3 confined spaces all structures of sewerage and wastewater treatment plants which are in contact with the wastewater, sludge, hazardous chemicals, etc., as far as they
35、are covered or sunken NOTE: Confined spaces also include inspection manholes and other shafts even if they are not in open contact with the wastewater. 4 General requirements Compliance with safety regulations has to be an integral part of the design and construction of the facilities. 4.1 Confined
36、spaces, hazards and warning systems 4.1.1 Confined spaces Special consideration is required for confined spaces in wastewater treatment plants which include e.g.: conduits; shafts, inspection manholes, seepage water shafts; basins (covered or sunken); drop structures; valve structures; inlet and out
37、let structures; sunken or enclosed screening plants; pumping stations (dry or wet wells); sludge silos and covered thickeners; digestion tanks; gasholders (gasometers); completely covered plants. 4.1.2 Hazards Hazards from substances in wastewater treatment plants can arise from solid substances, li
38、quids, vapours, gases and bio-aerosols, micro-organisms and dust particles in a dangerous quantity or concentration and through the presence of oxygen-displacing media. Hazards can also arise from substances being introduced from an external source or can be produced in situ by biological processes
39、(e.g. fermentation, putrefaction) or by chemical reactions (e.g. when different wastewaters are mixed). Hazards can arise from the following sources: gases or vapours which can cause fires or explosions; oxygen deficiency which can result in suffocation; toxic, corrosive, irritant, flammable or hot
40、substances, which can cause harm to health by contact, absorption through the skin or by ingestion, inhalation, or penetration through puncture wounds; increase of flow or level of water, e.g. following heavy rain or flooding;Page 6 EN 12255-10:2000 BSI 02-2001 micro-organisms and their metabolic pr
41、oducts which can result in infections; radioactive substances. 4.1.3 Warning systems for the safety of persons Provision shall be made to enable monitoring the atmosphere in confined spaces before entering to make sure that no health risk for persons exists. Fixed or portable monitoring equipment ma
42、y be employed; portable monitoring shall be operable from places of safety. Fixed monitoring equipment may also be used to actuate emergency systems (e.g. switching on ventilation). The activation of these means shall be indicated by appropriate signals. The monitoring equipment shall be tested to e
43、nsure reliability and shall be explosion protected. There shall be means of communication, e.g. telephone or radio. 4.2 Vehicular and pedestrian traffic routes 4.2.1 Vehicular and pedestrian traffic routes shall be laid out in accordance with the operational requirements to provide safe access to an
44、d regress from work places and maintenance positions. They shall be free of obstacles over which persons might trip and shall be constructed in such a way that they can be kept safe to walk along when wet or icy. This requirement is adequately satisfied, if e.g.: work places can be reached as direct
45、ly and conveniently as possible; paths are even and not obstructed by parts of the plant and there are no obstacles on the paths such as pipeline crossings and they are not obstructed by the operation of valves; obstacles such as open channels or conveyor belts are bridged over; floors are easy to c
46、lean; floor coverings, gratings, roads and paths have non-slip surfaces, and collection of water on the surfaces is prevented; paths are constructed of materials which are resistant against wear and tear; slabs and pavings are laid even and with narrow joints; non-slip surfaces allow safe walking in
47、 every direction under adverse conditions; doors of emergency exits open to the outside. 4.2.2 Traffic routes and thoroughfares shall be laid out in such a way as to prevent risks from vehicles during operation. This requirement is adequately satisfied, if e.g.: traffic routes are kept free from ins
48、tallations so that they can be used at any time; traffic routes for vehicles where passing doors, gates, passageways, thoroughfares, or stair-exits shall have a minimum 1,0 m clearance between the exit and the traffic way. Blind exits shall be protected, e.g. by use of diversion barriers or mirrors;
49、 traffic routes are present in adequate numbers and their layout and dimensions are such that they can be used safely by pedestrians or vehicles according to their function, e.g. adequate turning areas for vehicles; traffic routes for motorized or rail-mounted means of transport are wide enough to maintain a minimum safety distance of 0,5 m on both sides of traffic routes between the outer edge of the means of transport and the boundary of the
