prEN IEC 63341-2:2024

SLOVENSKI STANDARD
01-maj-2024
Železniške naprave - Vozna sredstva - Sistemi gorivnih celic za vozna sredstva - 2.
del: Sistem za shranjevanje vodika
Railway applications - Rolling stock - Fuel cell systems for propulsion - Part 2: Hydrogen
storage system
Ta slovenski standard je istoveten z: prEN IEC 63341-2:2024
ICS:
27.070 Gorilne celice Fuel cells
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

9/3050/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63341-2 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-03-08 2024-05-31
SUPERSEDES DOCUMENTS:
9/2923/CD, 9/2963A/CC
IEC TC 9 : ELECTRICAL EQUIPMENT AND SYSTEMS FOR RAILWAYS
SECRETARIAT: SECRETARY:
France Mr Denis MIGLIANICO
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 105
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clauses to
be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC clauses.
(SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Railway applications – Hydrogen and fuel cell systems for rolling stock – Part 2: Hydrogen fuel system
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

9/3050/CDV – 2 – IEC CDV 63341-2 © IEC 2024
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 11
2 Normative references . 11
3 Terms, definitions and abbreviated terms . 14
3.1 Terms and definitions . 14
3.2 Abbreviations . 21
4 Hydrogen fuel system description . 23
4.1 Overview. 23
4.2 Compressed hydrogen storage system module (CHSS module) . 24
4.3 Hydrogen handling system (HHS) . 24
4.4 On-board refuelling interface . 25
4.5 Fuel, purge and vent lines . 25
4.6 Monitoring and Control System (MCS) . 25
4.7 Safety monitoring devices (optional) . 26
5 Environmental requirements . 26
5.1 General . 26
5.2 Ambient air temperature . 26
5.3 Humidity . 26
5.4 Altitude . 26
5.5 Air movement, rain, snow, hail and solar radiation . 27
5.6 Atmosphere corrosivity & pollution degree . 27
5.7 Other constraints from the environment . 27
6 Interface requirements . 27
6.1 General . 27
6.2 Fluidic hydrogen interfaces . 27
6.2.1 Hydrogen supply from HHS to FCPS. 27
6.2.2 Fluidic interface with refilling station . 28
6.2.3 Purging fluidic interfaces . 28
6.2.4 Discharge of hydrogen to the atmosphere in case of fire . 29
6.2.5 Discharge of hydrogen to the atmosphere in case of overpressure . 30
6.3 Electrical hardwire interfaces . 30
6.4 Communication interfaces . 30
6.4.1 Interface with other on-board controllers . 30
6.4.2 Interface with refilling Station (optional) . 31
6.4.3 Interface with maintenance tools (optional) . 31
7 Performance requirements of the HFS . 32
8 Design requirements for hydrogen fuel system . 33
8.1 General . 33
8.2 Hydrogen quality . 33
8.3 Pressure ranges . 33
8.3.1 High-pressure section . 33
8.3.2 Medium pressure section . 34
8.4 Hydrogen flow rate . 36
8.5 Hydrogen temperature . 36
8.6 Hydrogen compatibility of materials. 36

IEC CDV 63341-2 © IEC 2024 – 3 – 9/3050/CDV
8.7 Electrical & network . 36
8.7.1 General . 36
8.7.2 General electrical principles. 36
8.8 Mechanical . 37
8.8.1 Mechanical integration of the HFS . 37
8.8.2 Structural design . 38
8.8.3 Bolted assemblies . 38
8.8.4 Lifting points . 38
8.8.5 Degree of protection . 38
8.8.6 Shock & vibration. 38
8.9 Fire protection . 38
8.10 Lifetime and refilling & duty cycles . 39
8.11 Eco-design . 39
8.12 Storage and transportation . 40
9 Design requirements for specific HFS sub-assemblies and components . 40
9.1 Introduction . 40
9.2 Methodology . 40
9.3 Compressed hydrogen storage system (CHSS) . 41
9.3.1 Hydrogen containers . 41
9.3.2 Mandatory fuel components . 41
9.3.3 Optional fuel components . 41
9.3.4 Structural frame of CHSS module . 42
9.4 Hydrogen handling system . 43
9.4.1 Introduction . 43
9.4.2 Mandatory fuel components . 43
9.4.3 Optional fuel components . 43
9.5 Rigid and flexible fuel and vent lines . 43
9.6 Hydrogen Refuelling Interface . 44
9.6.1 On-board hydrogen receptacle . 44
9.6.2 Optional refuelling components . 44
9.6.3 Refuelling communication devices (optional) . 44
9.7 General electrical principles . 45
9.7.1 Electronic devices . 45
9.7.2 Cabling & connectors . 45
9.7.3 EMC requirements . 45
9.8 Monitoring and Control System (MCS) . 45
9.8.1 Hardware . 45
9.8.2 Software . 45
9.9 Monitoring devices (optional) . 46
10 Control and monitoring requirements . 46
11 RAMS requirements. 46
11.1 Reliability & availability . 46
11.2 Safety . 47
11.2.1 Methodology . 47
11.2.2 Hazard identification . 48
11.2.3 Explosive atmosphere management. 48
11.2.4 Safety of refuelling process . 50
11.3 Maintenance . 51
11.3.1 Maintenance requirements . 51

9/3050/CDV – 4 – IEC CDV 63341-2 © IEC 2024
11.3.2 Maintenance documentation . 51
11.3.3 Flushing & inertizing processes . 52
11.3.4 Leak testing . 53
12 Marking and labelling . 54
12.1 Saf
...