NEN EN 12732 : 2013 + A1 2014

Foreword
1 Scope
2 Normative references
3 Definitions and abbreviations
4 Quality system
      4.1 Welding contractors
      4.2 Welders
      4.3 Welding supervisory/co-ordination personnel
      4.4 Testing personnel
5 Welding consumables
6 Production welding
      6.1 General requirements
      6.2 Joint preparation
      6.3 Preheating
      6.4 Tacking
      6.5 Welding
      6.6 Actions after welding
      6.7 Repair of weld defects
7 Special procedures
      7.1 Attachments of structural parts
      7.2 Attachments of cathodic protection connections
      7.3 Hot tapping and other welding work on
             pressurized pipelines and systems
8 Inspection of the weld joint
      8.1 General
      8.2 Scope of inspection
      8.3 Non-destructive examination
      8.4 Time of inspection
      8.5 Acceptance criteria
      8.6 Recording of test results
9 Documentation
      9.1 General
      9.2 Archiving requirements
10 Specific requirements for gas supply systems up to and
      including 16 bar MOP (distribution)
      10.1 General
      10.2 Welders
      10.3 Welding supervisory personnel
      10.4 Production welding
      10.5 Acceptance requirements
      10.6 Requirements for records and documentation
11 Specific requirements for gas supply systems greater
      than 16 bar MOP (transmission)
      11.1 General
      11.2 Welders
      11.3 Welding supervisory personnel
      11.4 Qualification of welding procedures
      11.5 Production welding
      11.6 Destructive testing of production welds
      11.7 Acceptance requirements
      11.8 Requirements for records and documentation
12 Specific requirements for metering, regulating and
      compressor stations
      12.1 General
      12.2 Specific requirements
Annex A (informative) Qualification for pipeline welders
Annex B (informative) Testing of the base material
Annex C (informative) Wall thickness compensation/design
                      examples
Annex D (informative) Critical aspects for hot-tap welding
                      or welding on gas-pressurized pipelines
Annex E (informative) Visual inspection of joints
Annex F (informative) Manual ultrasonic testing of weld
                      joints for wall thicknesses between
                      approximately 6 mm and 10 mm
Annex G (informative) Acceptance criteria recommendations
                      for on-site production welds
Annex H (informative) Recommendations for brazing and
                      aluminothermic welding of anodic
                      bonding leads
Annex I (informative) Bibliography

Covers requirements for the production and testing of weld joints for the installation and modification of onshore steel pipelines and pipework used in gas infrastructure, including in-service pipelines, for all pressure ranges for the carriage of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 and for the carriage of non-conventional gases such as injected biomethane where: - the pipeline elements are made of unalloyed or low-alloyed carbon steel; - the pipeline is not located within commercial or industrial premises as integral part of the industrial process on those premises except for any pipelines and facilities delivering gas to such premises; - the pipework is not located within household installations according to EN 1775; - the design temperature of the system is between -40 degrees C up to and including 120 degrees C.