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BS EN 1594:2024 - TC Tracked Changes. Gas infrastructure. Pipelines for maximum operating pressure over 16 bar. Functional requirements, 2024
- A-30442411.pdf [Go to Page]
- undefined
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Quality and management systems
- 5 Safety and the environment [Go to Page]
- 5.1 General
- 5.2 Appropriate safety measures
- 5.3 Routing considerations [Go to Page]
- 5.3.1 General
- 5.3.2 Surveys
- 5.3.3 Environmental impact
- 5.3.4 Ground conditions
- 5.4 Line valve spacing
- 6 Pressure safety [Go to Page]
- 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 ≤ 0,45 Rt0,5
- 6.5 Pipeline with DP equal to or less than 24 bar and hoop stress ≤ 0,30 Rt0,5
- 7 Design [Go to Page]
- 7.1 General [Go to Page]
- 7.1.1 Design principles
- 7.1.2 Basis of design [Go to Page]
- 7.1.2.1 Pipeline
- 7.1.2.2 Pipeline sections
- 7.2 Wall thickness determination [Go to Page]
- 7.2.1 Straight pipe
- 7.2.2 Bends and elbows
- 7.3 Additional design requirements [Go to Page]
- 7.3.1 Forces
- 7.3.2 Soil engineering data required
- 7.3.3 Structural models for pipeline sections
- 7.4 Analysis of stress and strain [Go to Page]
- 7.4.1 Elastic and extended elastic design [Go to Page]
- 7.4.1.1 General
- 7.4.1.2 Resultant stress
- 7.4.1.3 Allowable resultant stress
- 7.4.2 Limit state design [Go to Page]
- 7.4.2.1 General
- 7.4.2.2 Relevant limit states
- 7.5 Design report
- 7.6 Land management and geotechnical studies
- 7.7 Depth of cover
- 7.8 Casing pipes
- 7.9 Station design [Go to Page]
- 7.9.1 Layout
- 7.9.2 Components
- 7.9.3 Interaction with onshore pipeline section
- 7.9.4 Station pipework
- 7.10 Pipeline components
- 7.11 Pigging suitability
- 7.12 Arrangements for venting, recompression and flaring
- 7.13 Corrosion protection [Go to Page]
- 7.13.1 General
- 7.13.2 External coating [Go to Page]
- 7.13.2.1 External coating for above-ground pipeline sections
- 7.13.2.2 External coating for buried pipeline sections
- 7.13.3 Cathodic protection [Go to Page]
- 7.13.3.1 Basic requirement
- 7.13.3.2 Electrical interference
- 7.13.3.3 Insulation joints
- 7.13.3.4 Commissioning
- 7.14 Grid connections
- 8 Materials and components [Go to Page]
- 8.1 General [Go to Page]
- 8.1.1 Base material
- 8.1.2 Manufacturing requirements
- 8.1.3 Manufacturing procedure
- 8.1.4 Weldability [Go to Page]
- 8.1.4.1 General
- 8.1.4.2 Pipe
- 8.1.4.3 Other pipeline components
- 8.1.5 Mechanical properties [Go to Page]
- 8.1.5.1 Impact energy
- 8.1.5.2 Impact test temperature
- 8.1.5.3 Tensile properties
- 8.1.5.4 Hardness of welds
- 8.1.5.5 Properties after forming and heat treatment
- 8.1.6 Inspection documents [Go to Page]
- 8.1.6.1 Manufacturing under a comprehensive quality system
- 8.1.6.2 Manufacturing not under a comprehensive quality system
- 8.1.6.3 Small components
- 8.1.7 Other steel types or grades
- 8.1.8 Records
- 8.2 Pipes
- 8.3 Fittings [Go to Page]
- 8.3.1 General
- 8.3.2 Manufacturing
- 8.4 Flanged connections
- 8.5 Insulating connections [Go to Page]
- 8.5.1 Type test
- 8.5.2 Strength test
- 8.5.3 Electrical test
- 8.5.4 External tightness test
- 8.6 Valves
- 8.7 External and internal coatings
- 8.8 Welding end preparation
- 9 Construction [Go to Page]
- 9.1 General
- 9.2 Execution of work [Go to Page]
- 9.2.1 General
- 9.2.2 Marking out the site
- 9.2.3 Initial site inspections
- 9.2.4 Working strip
- 9.2.5 Separation of topsoil
- 9.2.6 Trenches
- 9.2.7 Crossing and proximity of buried structures (cables and pipes)
- 9.2.8 Handling and stringing
- 9.2.9 Bends [Go to Page]
- 9.2.9.1 Elastic bends
- 9.2.9.2 Field bends
- 9.2.10 Welding and weld examination
- 9.2.11 External coating [Go to Page]
- 9.2.11.1 General
- 9.2.11.2 Surface preparation, application conditions
- 9.2.11.3 Coating welded joints and uncoated parts of pipes
- 9.2.11.4 Repairing the coating
- 9.2.11.5 Coating valves, fittings and cable-to-pipe connections
- 9.2.11.6 Inspections
- 9.2.11.7 Mechanical protection
- 9.2.11.8 Rocky ground
- 9.2.11.9 Trenchless
- 9.2.12 Lowering into the trench
- 9.2.13 Ballasting and anchoring
- 9.2.14 Tie-ins
- 9.2.15 Backfill
- 9.2.16 Reinstatement
- 9.2.17 Markings
- 9.2.18 Final site inspection with owners and users
- 9.3 Special crossings [Go to Page]
- 9.3.1 General
- 9.3.2 Open-trench road or path crossings
- 9.3.3 Trenchless crossings
- 9.3.4 Requirements for casings
- 9.3.5 Open trench major water crossings
- 9.3.6 Horizontal directional drilling
- 9.4 Cleaning
- 9.5 Testing [Go to Page]
- 9.5.1 General
- 9.5.2 Test preparation
- 9.5.3 Strength test
- 9.5.4 Tightness test
- 9.5.5 Pre-testing
- 9.5.6 Dewatering
- 9.5.7 Golden welds
- 9.6 Acceptance [Go to Page]
- 9.6.1 As-built documents
- 9.6.2 Pre-commissioning
- 9.6.3 Handover and documentation
- 10 Operation and maintenance [Go to Page]
- 10.1 General [Go to Page]
- 10.1.1 Policy
- 10.1.2 Safety and environment
- 10.2 Organization
- 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 [Go to Page]
- 10.9.1 General
- 10.9.2 Pipeline surveillance, inspection and monitoring
- 10.9.3 Execution of repairs and modifications
- 10.9.4 Work involving cutting of the pipeline
- 10.9.5 Work on in-service pipelines
- 10.9.6 Repairs after emergency
- 10.9.7 Other and special maintenance activities
- 10.10 Introduction of hydrogen in existing natural gas pipelines
- 10.11 Abandonment and removal
- Annex A (normative)Requirements for fracture arrest of line pipe [Go to Page]
- A.1 General
- A.2 CVN impact test
- A.3 Drop weight tear test
- A.4 Test pieces, method, and frequency for CVN and DWT tests
- Annex B (informative)Hydrogen gas pipelines [Go to Page]
- B.1 General
- B.2 New pipelines
- B.3 Existing pipelines
- B.4 Other considerations [Go to Page]
