EN 12255-1:2002

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
   4.1 General requirements
   4.2 Design requirements
   4.3 Structural requirements
       4.3.1 General
       4.3.2 Dimensional tolerances
       4.3.3 Concrete tracks
       4.3.4 Fixings and connections between equipment
             and structures
       4.3.5 Access
       4.3.6 Building ventilation
       4.3.7 Water supply and drainage
       4.3.8 Lifting equipment
       4.3.9 Storage for hazardous chemicals and fuels
   4.4 Requirements for equipment
       4.4.1 Principles for mechanical design
       4.4.2 General design requirements
       4.4.3 Environmental impact
       4.4.4 Safety
       4.4.5 Documentation
       4.4.6 Spare parts, special tools
5 Test methods
   5.1 Function and performance
   5.2 Tightness testing of concrete basins
   5.3 Tightness testing of earthen basins
   5.4 Tightness testing of other structures and equipment
Annex A (informative) Explanatory notes
Annex B (normative) Structural tolerances
      B.1 Circular tank
          B.1.1 Circular tank with scraper
          B.1.2 Circular tank with a scraper bridge travelling
                on the side wall (track)
      B.2 Rectangular tank
Bibliography

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 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 subject 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 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 information additional to that contained in this standard may be obtained by referring to the Bibliography.