NEN EN 12285-1 : 2003

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Designation and purchaser's specification
6 Materials
   6.1 General
   6.2 Materials for shell, dished ends and manholes
   6.3 Materials for tank accessories
   6.4 Consumable
   6.5 Material inspection documentation
7 Design
   7.1 Forms of construction
   7.2 Single skin tanks
   7.3 Double skin tanks
   7.4 Dished ends
   7.5 Compartments
   7.6 Dimensions
        7.6.1 Material thickness
        7.6.2 Secondary skin
        7.6.3 Interstitial space
   7.7 Tolerances
   7.8 Shell plate arrangement
   7.9 Manholes and inspection covers
   7.10 Structural bolts
   7.11 Tank fittings, pipes and nozzles
   7.12 Stiffening rings
   7.13 Lifting lugs
8 Fabrication
   8.1 Plate preparation
   8.2 Shell plate forming
   8.3 Types of joints
   8.4 Welding procedures, welders' qualifications
   8.5 External coating
9 Testing
   9.1 General
   9.2 Pressure testing
   9.3 Testing of the external coating
10 Handling and installation
   10.1 Handling
   10.2 Installation
11 Marking of the tank and manufacturer's statement
   11.1 Marking of the tank
   11.2 Manufacturer's statement
   11.3 Drawings
Annex A (informative) Transport, storage and installation
        procedure
Annex B (informative) Evaluation of liquid-material-combinations
for storage tanks according to this standard
Annex C (informative) A-deviations
Bibliography

Describes the requirements for shop fabricated cylindrical, horizontal steel tanks, single and double skin for the underground storage of water polluting liquids (both flammable and non-flammable).