CEN/TR 17924:2023
(Main)Safety and control devices for burners and appliances burning gaseous and/or liquid fuels - Guidance on hydrogen specific aspects
Safety and control devices for burners and appliances burning gaseous and/or liquid fuels - Guidance on hydrogen specific aspects
This document gives guidance on hydrogen specific safety, design, construction, and performance requirements and testing of safety, control or regulating devices (hereafter referred to as controls) for burners and appliances burning gases with hydrogen content.
The following hydrogen concentrations are covered in this document:
- H2NG (hydrogen in natural gas) blends of 20 % hydrogen; or
- 100 % hydrogen; or
- varying blends / admixtures to natural gas.
Furthermore, it identifies the expected revision needs of the existing CEN/TC 58 standards as well as the need of potential further new standardization deliverables.
Sicherheits- und Regeleinrichtungen für Brenner und Brennstoffgeräte für gasförmige und/oder flüssige Brennstoffe - Leitfaden zu wasserstoffspezifischen Aspekten
Varnostne in nadzorne naprave za gorilnike in aparate na plin in/ali tekoča goriva - Navodilo o posebnih vidikih, značilnih za vodik
Ta dokument vsebuje navodilo za varnostne, zasnovne in konstrukcijske zahteve v zvezi z vodikom ter zahteve glede zmogljivosti in preskušanja varnostnih, nadzornih ali regulacijskih naprav (v nadaljnjem besedilu: kontrolniki) za gorilnike in aparate na plin z vsebnostjo vodika.
V tem dokumentu so zajete naslednje koncentracije vodika:
– mešanice H2NG (vodik v zemeljskem plinu) z 20-odstotnim vodikom; ali
– 100-odstotni vodik; ali
– različne mešanice/dodatki v zemeljskem plinu.
Prav tako določa pričakovane potrebe glede revizije obstoječih standardov CEN/TC 58 ter potrebo po nadaljnjih novih standardizacijskih dokumentih.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2023
Varnostne in nadzorne naprave za gorilnike in aparate na plin in/ali tekoča goriva -
Navodilo o posebnih vidikih, značilnih za vodik
Safety and control devices for burners and appliances burning gaseous and/or liquid
fuels - Guidance on hydrogen specific aspects
Sicherheits- und Regeleinrichtungen für Brenner und Brennstoffgeräte für gasförmige
und/oder flüssige Brennstoffe - Leitfaden zu wasserstoffspezifischen Aspekten
Ta slovenski standard je istoveten z: CEN/TR 17924:2023
ICS:
23.060.40 Tlačni regulatorji Pressure regulators
27.060.01 Gorilniki in grelniki vode na Burners and boilers in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
CEN/TR 17924
TECHNICAL REPORT
RAPPORT TECHNIQUE
April 2023
TECHNISCHER REPORT
ICS 23.060.40
English Version
Safety and control devices for burners and appliances
burning gaseous and/or liquid fuels - Guidance on
hydrogen specific aspects
Sicherheits- und Regeleinrichtungen für Brenner und
Brennstoffgeräte für gasförmige und/oder flüssige
Brennstoffe - Leitfaden zu wasserstoffspezifischen
Aspekten
This Technical Report was approved by CEN on 9 January 2023. It has been drawn up by the Technical Committee CEN/TC 58.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 17924:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 8
4 Classification. 9
4.1 Classes of control . 9
4.2 Classification of hydrogen . 9
5 Common properties . 11
6 General considerations regarding design and construction . 13
6.1 Mechanical parts of the control . 13
6.1.1 Theoretical background . 13
6.1.2 Holes . 15
6.1.3 Breather holes . 15
6.2 Materials . 25
6.2.1 General. 25
6.2.2 Housing . 26
6.2.3 Zinc alloys . 28
6.2.4 Springs . 28
6.2.5 Resistance to corrosion and surface protection . 28
6.3 Electrical parts of the control . 28
6.3.1 Electrical components . 28
7 Performance . 28
7.1 Leak-tightness . 29
7.1.1 Flow calculations . 29
7.1.2 Leakage rate measurements . 29
7.1.3 Conclusions on leakage rate measurements and calculations . 30
7.1.4 Considerations based on a risk assessment . 31
7.2 Durability . 36
7.2.1 Elastomers in contact with gas . 36
7.2.2 Lubricants in contact with gas . 36
8 Marking, instructions . 36
8.1 Instructions . 36
Annex A (informative) Modifications and/or additions to subclauses of CEN/TC 58/WG 11
standards due to introduction of Cat Hy as combustible gas . 37
Annex B (informative) Modifications and/or additions to subclauses of CEN/TC 58/WG 12
standards due to introduction of Cat Hy as combustible gas . 38
Annex C (informative) Modifications and/or additions to subclauses of CEN/TC 58/WG 13
standards due to introduction of Cat Hy as combustible gas . 41
Annex D (informative) Modifications and/or additions to subclauses of CEN/TC 58/WG 14
standards due to introduction of Cat Hy as combustible gas . 42
Annex E (informative) Risk assessment, standardization, certification and operation of gas
appliances with up to 20 vol.-% H fluctuating admixtures . 43
Annex F (informative) Risk assessment, standardization, certification and operation of gas
appliances using hydrogen (ISO 14687:2019, Type I, Grade A) . 48
Annex G (informative) Proposal for leakage rate requirements and tests for gas pipe work
including controls (e.g. valves, regulators, pressure switches) used in gas appliances (e.g.
forced draught gas-burners or industrial thermo-processing equipment) and the impact
on the installation room size . 52
Annex H (informative) Breather hole leakage rate mitigation measures . 65
Annex I (informative) Leakage rate mitigation measures . 68
Bibliography . 72
European foreword
This document (CEN/TR 17924:2023) has been prepared by Technical Committee CEN/TC 58 “Safety
and control devices for burners and appliances burning gaseous or liquid fuels”, the secretariat of which
is held by BSI.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
Introduction
The use of hydrogen as a renewable fuel next to biomethane is seen as a promising alternative to natural
gas in the near future. As soon as the according regulations and standards are in force, the use of hydrogen
can be expected on a more regular basis.
For this reason, the heating and combustion business have to provide suitable solutions based on
standardized safety, construction, and performance requirements.
This document will provide a first summary of considerations regarding safety and performance aspects
for safety and control devices which will in some cases require further research and which is not
exhaustive.
There are ongoing research projects on the use of hydrogen as an admixture with natural gas in various
percentages or as hydrogen like the European THyGA project (up to 60 vol.-% hydrogen admixtures to
natural gas) which results could have an influence on these first considerations.
Therefore, this document is written in preparation of future revisions of CEN/TC 58 documents and will
describe findings pointing at potential changes, give the according research backgrounds and provide
literature sources.
The first edition of this document includes theoretical evaluations regarding different gases, comparing
their different characteristics, properties, behaviours, and their impact on the risk assessment for gas
appliances. These theoretical evaluations will be complemented by laboratory measurements, which will
be then included in a future revision of this document.
For the future implementation of hydrogen in the whole value chain co-operation with other CEN/TCs is
necessary like e.g. CEN/TC 234 “Gas infrastructure”, CEN/TC 109 “Central heating boilers using gaseous
fuels”, CEN/TC 131 “Gas burners using fans” and CEN/TC 186 “Industrial thermoprocessing -Safety”.
This document up to Annex A is based on the structure of EN 13611:2019, which means that clauses and
subclauses including their designations are aligned to this standard.
In this document only those clauses of EN 13611:2019 are referred to, which may be affected by using
hydrogen or hydrogen admixtures as gaseous fuels. All other clauses, which may be not affected, are not
listed in this document.
1 Scope
This document is written in preparation of future revision of standards dealing with the general safety,
design, construction, and performance requirements and testing of safety, control or regulating devices
(hereafter referred to as controls) for burners and appliances burning:
• H NG (hydrogen in natural gas) fluctuating admixture of no more than 20 vol.-% hydrogen content;
or
• hydrogen according to ISO 14687:2019, at least Type I, Grade A; or
• fluctuating admixtures to natural gas from 0 vol.-% to above 20 vol.-% hydrogen (e.g. 0 vol.-% to
10 vol.-% or 0 vol.-% to 40 vol.-%).
This document refers to controls with declared maximum inlet pressure up to and including 500 kPa and
of nominal connection sizes up to and including DN 250.
The purpose of this document is to provide guidance on hydrogen specific topics, which need to be
considered in the future standardization of controls covered by CEN/TC 58 documents including:
• automatic shut-off valves;
• automatic burner control systems;
• flame supervision devices;
• gas/air ratio controls;
• pressure regulators;
• manual taps;
• mechanical thermostats;
• multifunctional controls;
• pressure sensing devices;
• valve proving systems;
• automatic vent valves.
Hydrogen will play significant role in the future in several energy segments and requirements and test
methods need to be verified and adapted, if necessary.
The main target of this document is to lay the ground for defining requirements and tests for controls
used for safety related functions (e.g. safety valves, automatic burner control systems, gas/air ratio
controls) or regulating devices.
Summaries of subclauses to be addressed in the respective standards of each CEN/TC 58 WG are given in
• Annex A: Specific considerations to CEN/TC 58 WG 11 standards,
• Annex B: Sp
...
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