NS EN 12255-1 : 1ED 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

Provides general requirements for structures and equipment as they relate to wastewater treatment plants for a total population of more that 50 PT.