S.R. CEN/TR 17797:2022

European foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
4 Executive summary
5 General considerations for the entire gas infrastructure
6 Technical considerations per topic applicable for the different parts of the gas infrastructure (along chain)
7 Conclusions — H2 suitability of components, materials and procedures used in the gas infrastructure related to identified H2 concentrations
8 Revision needs of existing CEN/TC 234 standards and additional deliverables for the H2-readiness of the gas infrastructure
Annex A (informative) Any issue coming up during the discussion and outside of the TC 234
Annex B (informative) Safety characteristics of natural gas hydrogen mixtures
Annex C (informative) Operating principles for gas warning devices [2]
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 99
Annex G (informative) Use of polyamide (PA-U) in gas piping systems in relation to
hydrogen, methane or their mixtures
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
Bibliography

This document is written in preparation of future standardization and provides guidance on how injection of H2 into the gas infrastructure can impact processes from the input of gas into the on-shore transmission network up to the inlet connection of gas appliances.