oSIST prEN 17124:2025
(Main)Hydrogen fuel - Product specification and quality assurance for hydrogen refuelling points dispensing liquid or gaseous hydrogen - Proton exchange membrane (PEM) fuel cell applications for vehicles
Hydrogen fuel - Product specification and quality assurance for hydrogen refuelling points dispensing liquid or gaseous hydrogen - Proton exchange membrane (PEM) fuel cell applications for vehicles
This document specifies the quality characteristics of liquid or gaseous hydrogen fuel dispensed at hydrogen refuelling stations for use in proton exchange membrane (PEM) fuel cell vehicle systems, and the corresponding quality assurance considerations for ensuring uniformity of the hydrogen fuel.
Wasserstoff als Kraftstoff - Produktfestlegung und Qualitätssicherung für Wasserstoffbetankungsanlagen zur Abgabe gasförmigen Wasserstoffs - Protonenaustauschmembran (PEM)-Brennstoffzellenanwendungen für Fahrzeuge
Carburant hydrogène - Spécification de produit et assurance qualité pour les points de ravitaillement en hydrogène distribuant de l'hydrogène gazeux - Applications des piles à combustible à membrane à échange de protons (MEP) pour les véhicules
Vodik kot gorivo - Specifikacija proizvoda in zagotavljanje kakovosti tekočega ali plinastega vodika na polnilnih postajah - Gorivne celice z membrano za protonsko izmenjavo (PEM) za cestna vozila
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2025
Vodik kot gorivo - Specifikacija proizvoda in zagotavljanje kakovosti tekočega ali
plinastega vodika na polnilnih postajah - Gorivne celice z membrano za protonsko
izmenjavo (PEM) za cestna vozila
Hydrogen fuel - Product specification and quality assurance for hydrogen refuelling
points dispensing liquid or gaseous hydrogen - Proton exchange membrane (PEM) fuel
cell applications for vehicles
Wasserstoff als Kraftstoff - Produktfestlegung und Qualitätssicherung für
Wasserstoffbetankungsanlagen zur Abgabe gasförmigen Wasserstoffs -
Protonenaustauschmembran (PEM)-Brennstoffzellenanwendungen für Fahrzeuge
Carburant hydrogène - Spécification de produit et assurance qualité pour les points de
ravitaillement en hydrogène distribuant de l'hydrogène gazeux - Applications des piles à
combustible à membrane à échange de protons (MEP) pour les véhicules
Ta slovenski standard je istoveten z: prEN 17124
ICS:
27.075 Tehnologija vodika Hydrogen technologies
43.060.40 Sistemi za gorivo Fuel systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2025
ICS 27.075; 75.160.20 Will supersede EN 17124:2022
English Version
Hydrogen fuel - Product specification and quality
assurance for hydrogen refuelling points dispensing liquid
or gaseous hydrogen - Proton exchange membrane (PEM)
fuel cell applications for vehicles
Carburant hydrogène - Spécification de produit et Wasserstoff als Kraftstoff - Produktfestlegung und
assurance qualité pour les points de ravitaillement en Qualitätssicherung für Wasserstoffbetankungsanlagen
hydrogène distribuant de l'hydrogène gazeux - zur Abgabe gasförmigen Wasserstoffs -
Applications des piles à combustible à membrane à Protonenaustauschmembran (PEM)-
échange de protons (MEP) pour les véhicules Brennstoffzellenanwendungen für Fahrzeuge
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 268.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17124:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Requirements . 5
5 Hydrogen Quality Assurance Methodology . 6
5.1 General Requirements – Potential sources of impurities . 6
5.2 Prescriptive Approach for Hydrogen Quality Assurance . 6
5.3 Risk Assessment for Hydrogen and Quality Assurance . 6
5.4 Impact of impurities on fuel cell power train . 9
6 Hydrogen Quality Control Approaches . 11
6.1 General requirements . 11
6.2 Spot sampling . 11
6.3 Monitoring . 11
7 Routine Quality Control . 11
8 Non-routine Quality Control . 11
9 Non compliances . 12
Annex A (informative) Impact of impurities . 13
Annex B (informative) Example of Supply chain evaluation with regards to potential sources of
impurities . 17
Annex C (informative) Example of Risk Assessment template . 21
Bibliography . 23
European foreword
This document (prEN 17124:2025) has been prepared by Technical Committee CEN/TC 268 “Cryogenic vessels
and specific hydrogen technologies applications”, the secretariat of which is held by AFNOR.
This document supersedes EN 17124:2022.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its Member
States.
1 Scope
This document specifies the quality characteristics of liquid or gaseous hydrogen fuel dispensed at hydrogen
refuelling stations for use in proton exchange membrane (PEM) fuel cell vehicle systems, and the corresponding
quality assurance considerations for ensuring uniformity of the hydrogen fuel.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
constituent
component (or compound) found within a hydrogen fuel mixture
3.2
contaminant
impurity that adversely affects the components within the fuel cell system or the hydrogen storage system
Note 1 to entry: An adverse effect can be reversible or irreversible.
3.3
detection limit
lowest quantity of a substance that can be distinguished from the absence of that substance with a stated
confidence limit
3.4
fuel cell system
power system used for the generation of electricity on a fuel cell vehicle, typically containing the following
subsystems: fuel cell stack, air processing, fuel processing, thermal management and water management
3.5
hydrogen fuel index
fraction or percentage of a fuel mixture that is hydrogen
3.6
irreversible effect
effect which results in a permanent degradation of the fuel cell power system performance that cannot be
restored by practical changes of operational conditions and/or gas composition
3.7
on-site fuel supply
hydrogen fuel supplying system with a hydrogen production system in the same site
3.8
off-site fuel supply
hydrogen fuel supplying system without a hydrogen production system in the same site, receiving hydrogen
fuel which is produced out of the site
3.9
particulate
solid or liquid particle (aerosol) that can be entrained somewhere in the delivery, storage, or transfer of the
hydrogen fuel
3.10
reversible effect
effect which results in a non-permanent degradation of the fuel cell power system performance that can be
restored by practical changes of operational conditions and/or gas composition
4 Requirements
The fuel quality requirements at the dispenser nozzle shall meet the requirements of Table 1.
NOTE The fuel specification is not process or feedstock specific. Non-listed contaminants have no guarantee of being
benign.
Table 1 — Fuel quality specifications for PEM fuel cell road vehicle applications
Constituent Characteristics
a
99,97 %
Hydrogen fuel index (minimum mole fraction)
Total non-hydrogen gases 300 μmol/mol
Maximum concentration of individual contaminants
b
5 μmol/mol
Water (H O)
c
2 μmol/mol
Total hydrocarbons (Excluding Methane) C1
equivalent
Methane (CH ) 100 µmol/mol
Oxygen (O ) 5 μmol/mol
Helium (He) 300 μmol/mol
Nitrogen (N ) 300 μmol/mol
Argon (Ar) 300 μmol/mol
Carbon dioxide (CO ) 2 μmol/mol
d
0,2 μmol/mol
Carbon monoxide (CO)
e
0,004 μmol/mol
Sulfur compounds (H S equivalent)
d
0,2 μmol/mol
Formaldehyde (HCHO)
Ammonia (NH ) 0,1 μmol/mol
f
0,05 μmol/mol
Halogenated compounds (Halogen equivalent)
Maximum particulates concentration 1 mg/kg
For the constituents that are grouped, such as hydrocarbons, sulphur compounds and
halogenated compounds, the sum of the constituents shall be less than or equal to the
acceptable limit.
a
The hydrogen fuel index is determined by substracting the “total non-hydrogen gases” in this
table, expressed in mole percent, from 100 mol percent.
b
The allowable water content is based upon a HRS operating at 70 MPa nominal pressure and −40 °C
hydrogen precooling. The allowable water content may be allowed to increase to 7 μmol/mol H2O for
a station only dispensing at a nominal working pressure of 35 MPa and a precooling temperature of
−26 °C or warmer. The change should be confirmed by the hydrogen quality plan as discussed in
Clause 5 to ensure that no water condensate can form. The potential temperatures and pressures in
the FCEV should be considered.
c
Total hydrocarbons except methane include oxygenated organic species. Total hydrocarbons
shall be measured on a C1 equivalent (μmol/mol).
d
Total of CO, HCHO shall not exceed 0,2 µmol/mol.
e
Sulphur compounds which could potentially be in the hydrogen gas (for example, H2S, COS, CS2 and
mercaptans) should be determined by the hydrogen quality control plan discussed in Clause 5.
Sulphur compounds shall be measured on a S1 equivalent (μmol/mol).
f
All halogenated compounds which could potentially be in the hydrogen gas (for example, hydrogen
chloride (HCl), and organic halides (R-X)) should be determined according to the hydrogen quality
assurance discussed in Clause 5 and the sum shall be less than 0,05 µmol /mol).
5 Hydrogen Quality Assurance Methodology
5.1 General Requirements – Potential sources of impurities
A quality assurance plan for the entire supply chain shall be created to ensure that the hydrogen quality will
meet the requirements listed in Clause 4. The methodology used to develop the quality assurance plan can vary
but shall include one of the two approaches described in this document. The general description of these two
approaches are described in 5.2 and 5.3.
For a given Hydrogen Refuelling Station (HRS), the contaminants listed in the hydrogen specification referred
to Table 1 could be present. There are several parts of the supply chain where impurities can be introduced.
Annex B describes potential impurities at each step of the supply chain.
When a contaminant is classified as potentially present, it shall be taken into account in the Quality Assurance
methodology (risk assessment or prescriptive approach) described below.
5.2 Prescriptive Approach for Hydrogen Quality Assurance
A prescriptive approach can be applied for clearly identified supply chains. The prescriptive approach is not
defined in this document.
5.3 Risk Assessment for Hydrogen and Quality Assurance
Risk assessment consists of identifying the probability of having each impurity above the threshold values of
specifications given in Table 1 and evaluating the severity of each impurity for the fuel cell car. As an aid to
clearly defining the risk(s) for risk assessment purposes, three fundamental questions are often helpful:
— What might go wrong: which event could cause the impurities to be above the threshold value?
— What is the likelihood (probability of occurrence) that impurities could be abo
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