NEN EN 1594 : 2013

Foreword
Introduction
1. Scope
2. Normative references
3. Definitions, symbols and abbreviations
4. Quality system
5. Safety and the environment
   5.1 Introduction
   5.2 Appropriate safety measures
   5.3 Routing considerations
   5.4 Linevalve spacing
6. Pressure safety
   6.1 Pressure levels
   6.2 Normal operation
   6.3 Requirements for installation of pressure safety devices
   6.4 Pipeline with DP equal to or less than 40 bar and hoop
       stress equal to or less than 0,45R t0,5
   6.5 Pipeline with DP equal to or less than 24 bar and hoop
       stress equal to or less than 0,30R t0,5
7. Design
   7.1 General
   7.2 Wall thickness determination
   7.3 Additional design requirements
   7.4 Analysis of stress and strain
   7.5 Design report
   7.6 Land management and geotechnical studies
   7.7 Depth of cover
   7.8 Casing pipes
   7.9 Station design
   7.10 Pipeline components
   7.11 Pigging suitability
   7.12 Arrangements for venting
   7.13 Corrosion protection
8. Materials
   8.1 General requirements
   8.2 Pipes
   8.3 Fittings
   8.4 Flanged connections
   8.5 Insulating connections
   8.6 Valves
   8.7 External and internal coatings
9. Construction
   9.1 General
   9.2 Execution of work
   9.3 Special crossings
   9.4 Cleaning
   9.5 Testing
   9,6 Acceptance
10.Operation and maintenance
10.1 General
10.2 Organisation
10.3 Operating and maintenance instructions
10.4 Emergency plan
10.5 Records and documentation
10.6 Commissioning
10.7 Decommissioning
10.8 Recommissioning
10.9 Maintenance, modification and repair
10.10. Abandonment
Annex A (informative) Bibliography
Annex B (informative) Settlement areas
Annex C (informative) Mining subsidence
Annex D (informative) Frost heave
Annex E (informative) Landslide areas
Annex F (informative) Areas with high seismic risk
Annex G (informative) Extended elastic and limit state design
Annex H (informative) Soil mechanics parameters
Annex I (informative) Bored/jacked crossing
Annex J (informative) Allowable pulsation and vibration levels
Annex K (informative) Allowable variation levels from
                      construction work - blasting
Annex L (informative) Wall thickness calculation for tees and
                      other openings
Annex M (informative) Wall thickness calculation for caps
                      (domed ends)

Pertains to pipelines with a maximum operating pressure (MOP) over 16 bar for the carriage of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 in onland gas infrastructure.