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PD CEN/TR 17797:2022 Gas infrastructure - Consequences of hydrogen in the gas infrastructure and identification of related standardisation need in the scope of CEN/TC 234, 2022
- undefined
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and abbreviations [Go to Page]
- 3.1 Terms and definitions
- 3.2 Symbols and abbreviations
- 4 Executive summary
- 5 General considerations for the entire gas infrastructure [Go to Page]
- 5.1 Explosion protection and prevention [Go to Page]
- 5.1.1 General principles
- 5.1.2 Safety characteristics of natural gas-hydrogen mixtures and their impact on explosion prevention [Go to Page]
- 5.1.2.1 General
- 5.1.2.2 Prevention of the formation of explosive atmospheres
- 5.1.2.3 Avoidance of the ignition of explosive atmospheres
- 5.1.3 Consequences of H2 and H2NG in NG infrastructure for explosion protection related to identified H2 concentrations [Go to Page]
- 5.1.3.1 Hydrogen content up to 10 Vol.%
- 5.1.3.2 Hydrogen content above 10 Vol.% up to full replacement of natural gas by hydrogen (100 % hydrogen)
- 5.2 N2NG mixtures in contact with materials — Pressure integrity, gas tightness and functionality [Go to Page]
- 5.2.1 General [Go to Page]
- 5.2.1.1 Hydrogen tolerance of pipeline materials
- 5.2.1.2 Hydrogen tolerance of fitting materials
- 5.2.2 Steel [Go to Page]
- 5.2.2.1 General
- 5.2.2.2 Mechanical behaviour
- 5.2.2.3 Welding of steel
- 5.2.3 PE and PAU
- 5.2.4 Alloys
- 5.2.5 Information on deterioration and chemical aggression of elastomers
- 5.2.6 Others
- 5.3 Volume in relation to energy content — consequences for the capacity and function of the gas transportation, underground gas storage and distribution system
- 6 Technical considerations per topic applicable for the different parts of the gas infrastructure (along chain) [Go to Page]
- 6.1 General
- 6.2 Gas quality [Go to Page]
- 6.2.1 Scope of considerations — Gas quality — EN 16726
- 6.2.2 Technical considerations — Identified H2NG [Go to Page]
- 6.2.2.1 Relative density
- 6.2.2.2 Water dew point
- 6.2.2.3 Hydrocarbon dew point
- 6.2.2.4 Methane number
- 6.3 Gas compression [Go to Page]
- 6.3.1 Scope of consideration — Gas compression
- 6.3.2 Technical considerations — Identified H2NG aspects — Gas compression
- 6.4 Gas pipelines with MOP over 16 bar — Gas transmission [Go to Page]
- 6.4.1 Scope of consideration — Gas transmission — EN 1594
- 6.4.2 Hydrogen piping and pipelines — ASME B31.12 [Go to Page]
- 6.4.2.1 General
- 6.4.2.2 Fracture mechanics of hydrogen transporting pipelines
- 6.4.2.3 Requalifying existing pipelines for hydrogen service
- 6.4.3 Technical considerations — Identified H2NG aspect — Gas transmission [Go to Page]
- 6.4.3.1 Hydrogen-enhanced fatigue of pipelines
- 6.4.3.2 Approach for fit for purpose of existing natural gas pipelines with respect to hydrogen
- 6.5 Gas pressure control [Go to Page]
- 6.5.1 Scope of consideration — Gas pressure control — EN 12186 and EN 12279
- 6.6 Gas metering [Go to Page]
- 6.6.1 Scope of consideration — Gas metering — EN 1776
- 6.6.2 Technical considerations — Identified H2NG aspects — Gas metering
- 6.7 Gas supply systems up to and including 16 bar and pressure testing [Go to Page]
- 6.7.1 Statement for gas pipelines with MOP up to and including 16 bar for all concentrations
- 6.7.2 Requalifying existing pipelines for hydrogen service
- 6.7.3 Technical consideration — Scoping considerations — EN 12007-1 to -4, CEN/TS 12007-6, EN 12327 and EN 12732 [Go to Page]
- 6.7.3.1 General
- 6.7.3.2 EN 12007-1:2012: General Functional Requirements for gas infrastructure up to and including 16 bar
- 6.7.3.3 EN 12007-2 (Polyethylene Pipe) and CEN/TS 120076 (Unplasticized Polyamide Pipe)
- 6.7.3.4 EN 12007-3:2013 Steel pipe infrastructure
- 6.7.3.5 EN 12007-4 – Renovation
- 6.7.3.6 EN 12327:2012 — Pressure testing, purging, commissioning and decommissioning
- 6.7.3.7 Welding on steel pipes from as distribution perspective
- 6.8 Service lines [Go to Page]
- 6.8.1 Scoping considerations — Service lines — EN 12007-5
- 6.8.2 Technical considerations — Identified H2NG aspects integrity and safety, reliability and operation [Go to Page]
- 6.8.2.1 Design
- 6.8.2.2 Materials and components
- 6.8.2.3 Regulators and meters
- 6.8.2.4 Pipe sizing
- 6.8.2.5 Identification
- 6.8.2.6 Measurement equipment
- 6.9 Industrial piping [Go to Page]
- 6.9.1 Scope of consideration – Industrial piping – EN 15001-1 and EN 15001-2
- 6.9.2 Technical considerations — Industrial piping [Go to Page]
- 6.9.2.1 Industrial piping — Materials — General remarks
- 6.9.2.2 Industrial piping — Requirements for gas/hydrogen mixtures- considerations to maximum hydrogen content
- 6.10 Gas pipework for buildings [Go to Page]
- 6.10.1 Scope of consideration — Gas pipework for buildings – EN 1775
- 6.10.2 Technical considerations — Gas pipework for buildings
- 6.11 Underground gas storage [Go to Page]
- 6.11.1 Scope of consideration for underground gas storage — Generals EN 1918-1 to -5
- 6.11.2 Technical considerations — Underground gas storage [Go to Page]
- 6.11.2.1 Pore storage and caverns
- 6.11.2.2 Wells
- 6.11.2.3 Gas piping
- 6.11.2.4 Compression units
- 6.11.2.5 Dehydration units
- 6.11.2.6 Desulfurization units
- 6.11.2.7 Metering
- 6.11.2.8 Other plant components
- 6.11.3 Identified H2NG impacts — Underground gas storage
- 6.12 Safety management and integrity management [Go to Page]
- 6.12.1 Scope of considerations
- 6.12.2 Safety management system — Management of change [Go to Page]
- 6.12.2.1 General
- 6.12.2.2 Awareness
- 6.12.2.3 Competence
- 6.12.2.4 Identification
- 6.12.2.5 Safety procedures
- 6.12.2.6 Emergency response
- 6.12.2.7 Connecting systems
- 6.12.3 Pipeline integrity management system [Go to Page]
- 6.12.3.1 Safety aspects
- 6.12.3.2 Integrity assessment
- 6.12.3.3 The integrity condition of the pipeline
- 6.12.3.4 Leak detection surveys
- 6.12.3.5 Monitoring
- 7 Conclusions — H2 suitability of components, materials and procedures used in the gas infrastructure related to identified H2 concentrations [Go to Page]
- 7.1 General
- 7.2 H2 suitability —Gas quality [Go to Page]
- 7.2.1 H-gas quality – Admixture of H2
- 7.2.2 Hydrogen quality in converted natural gas grids
- 7.3 H2 suitability — Gas compressor stations [Go to Page]
- 7.3.1 General
- 7.3.2 Less than 1 % hydrogen in natural gas
- 7.3.3 Over 1 Vol.-% up to 5 Vol.-% H2 in natural gas
- 7.4 H2 suitability — Gas transmission pipelines with MOP over 16 bar
- 7.5 H2 suitability — Gas pressure control [Go to Page]
- 7.5.1 Introduction
- 7.5.2 General
- 7.5.3 Up to 10 Vol.% H2 in natural gas
- 7.5.4 Over 10 Vol.-% up to 100 % H2 in natural gas
- 7.6 H2 suitability — Gas metering
- 7.7 H2 suitability — Gas pipelines with MOP up to and including 16 bar [Go to Page]
- 7.7.1 A Summary of findings for gas pipeline systems up to and including 16 bar and pressure testing (CEN/TC 234 WG 2)
- 7.8 H2 suitability — Service lines
- 7.9 H2 suitability — Industrial piping
- 7.10 H2 suitability — Gas pipework for buildings
- 7.11 H2 suitability — Underground gas storage [Go to Page]
- 7.11.1 General
- 7.11.2 Between 0 % and 1 % hydrogen in natural gas
- 7.11.3 Between 1 % and 20 % hydrogen in natural gas
- 7.11.4 Above 20 % hydrogen up to full replacement of natural gas by hydrogen (100 % hydrogen)
- 8 Revision needs of existing CEN/TC 234 standards and additional deliverables for the H2-readiness of the gas infrastructure [Go to Page]
- 8.1 Action need
- 8.2 Gas quality — Expected revision of EN 16726:2015+A1:2018
- 8.3 Gas compression — Expected revision of EN 12583:2014
- 8.4 Pipelines for maximum operating pressure over 16 bar — Expected revisions of EN 1594:2013
- 8.5 Gas pressure control — Expected revisions of EN 12186:2014 and EN 12279:2000
- 8.6 Gas measuring systems — Expected revision of EN 1776:2015
- 8.7 Pipelines for maximum operating pressure up to and including 16 bar — Expected revision of EN 12007 Parts 1 to 4 and EN 12327:2012
- 8.8 Pressure testing, commissioning and decommissioning procedures — Expected revision of EN 12327:2012
- 8.9 Welding of steel — Expected revision of EN 12732:2013
- 8.10 Service lines — Expected revision of EN 12007-5:2014
- 8.11 Gas installation pipework– Expected revision of FprEN 15001-1:2019 and EN 15001-2:2019
- 8.12 Gas pipework for buildings — Expected revision of EN 1775
- 8.13 Underground gas storage– Expected revision of EN 1918-1:2016 to -5:2016
- 8.14 Safety and Integrity Management System — Expected revision of EN 16348 and EN 15399 by prEN 17649 (merged standard)
- Annex A (informative)Any issue coming up during the discussion and outside of the TC 234 scope
- Annex B (informative)Safety characteristics of natural gas-hydrogen mixtures
- Annex C (informative)Operating principles for gas warning devices [2] [Go to Page]
- C.1 General
- C.2 Gas warning devices in explosion protection
- C.3 Calibration and adjustment of Gas warning devices
- C.4 Where to install the gas sensors for monitoring hazardous areas?
- Annex D (informative)Hydrogen pressure versus hydrogen percentage
- Annex E (informative)Hydrogen pressure versus hydrogen fugacity
- Annex F (informative)An example of the use of an existing gas pipeline for hydrogen gas
- Annex G (informative)Use of polyamide (PA-U) in gas piping systems in relation to hydrogen, methane or their mixtures [Go to Page]
- G.1 General
- G.2 Chemical effect of hydrogen (H2), methane (CH4) or their mixtures on PA-U [Go to Page]
- G.2.1 General statement against hydrogen embrittlement
- G.2.2 Chemical resistance tables
- G.2.3 Chemical resistance studies for the effect of hydrogen or methane or their mixtures on PA-U [Go to Page]
- G.2.3.1 Effect of H2 on high molecular weight Polyamide
- G.2.3.2 Effect of hydrogen or methane or their mixtures on PA-U11
- G.3 Permeation of hydrogen or methane or their mixtures through PA-U [Go to Page]
- G.3.1 General
- G.3.2 Permeation of hydrogen or methane through PA-U12
- G.3.3 Permeation of H2 or CH4 or their mixtures through PA-U11
- G.3.4 Multilayer pipe (MLP) concepts with H2 barrier layer
- G.4 Conclusion about effect of hydrogen or methane or their mixtures on PA-U11 and PA-U12
- G.5 Further relevant PA-U behaviour [Go to Page]
- G.5.1 Squeeze-off [Go to Page]
- G.5.1.1 Squeeze-off behaviour in air
- G.5.1.2 Squeeze-Off behaviour in hydrogen
- G.5.1.3 Squeezed off area and effect on creep gas levels for PE100RC and PAU12 pipes
- G.5.2 Training and qualification of welding personnel
- Annex H (informative)Netbeheer Nederland Study for biomethane and 100 % hydrogen
- Annex I (informative)Responsibility of CEN/TC 234 'Gas infrastructure' Working groups for the parts of the gas infrastructure along the chain
- Annex J (informative)Symbols and abbreviations [Go to Page]
