NEN EN 14620-2 : 2006

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Materials
  4.1 General
  4.2 Temperatures
  4.3 Primary and secondary liquid container
  4.4 Vapour container/outer tank
  4.5 Other components
5 Design
  5.1 Design theory
  5.2 Primary and secondary liquid container
  5.3 Vapour container (outer tank)
  5.4 Suspended roof
  5.5 Nozzles
  5.6 Primary and secondary containment, bottom connections
  5.7 Connections between containers
  5.8 Other details
6 Fabrication
  6.1 Handling of materials
  6.2 Plate preparation and tolerances
  6.3 Tolerances
  6.4 Roof
  6.5 Temporary attachments
7 Welding procedures
  7.1 General
  7.2 WPAR requirements
  7.3 Impact testing
  7.4 9 % Nickel steel
  7.5 Welders and welding operators
  7.6 Production test plates
8 Welding
  8.1 Tack and temporary welds
  8.2 Atmospheric conditions
  8.3 Preheating
  8.4 Post-weld heat treatment
9 Inspection
  9.1 Qualification of NDE personnel
  9.2 Inspection procedures
  9.3 Type of inspections
  9.4 Visual inspection
  9.5 Dye penetrant examination
  9.6 Magnetic particle examination
  9.7 Vacuum box examination
  9.8 Ammonia tightness test
  9.9 Soap bubble examination
  9.10 Radiographic examination
  9.11 Ultrasonic examination
  9.12 Acceptance criteria
  9.13 Unacceptable defects in horizontal welds
  9.14 Acceptable thinning after grinding
Annex A (informative) Actions on membrane
Annex B (informative) Determination of the load and fatigue
        curves for membrane
Bibliography

Specifies general requirements for the materials, design, construction and installation of the metallic components of refrigerated liquefied gas storage tanks.