Hydrogen generators using water electrolysis - Part 1: Safety (ISO 22734-1:2025)

This document specifies the safety requirements of hydrogen gas generation appliances or systems that use electrochemical reactions to electrolyse water to produce hydrogen, herein referred to as hydrogen generators.

Wasserstofferzeuger auf Grundlage der Elektrolyse von Wasser - Teil 1: Sicherheitsanforderungen (ISO 22734-1:2025)

Dieses Dokument legt die Anforderungen an den Aufbau, die Sicherheit, die Eignungsprüfung und die Dokumentation von modularen oder werkseitig angepassten Wasserstoffgas-Erzeugungsgeräten oder -Erzeugungssystemen, im Folgenden Wasserstofferzeuger genannt, fest, die elektrochemische Reaktionen für die Elektrolyse von Wasser nutzen, um Wasserstoff zu erzeugen.
Dieses Dokument gilt für Wasserstofferzeuger, die die folgenden Arten eines Ionentransportmediums nutzen:
- wässrige alkalische (basische) Elektrolyte wie Kaliumhydroxid- oder Natriumhydroxidlösungen;
- wässrige saure Elektrolyte wie verdünnte Schwefelsäure;
- Festpolymermaterial mit angehängten sauren funktionellen Gruppen wie Säure-Protonenaustauschmembran (PEM, en: proton exchange membrane);
- Festpolymermaterial mit angehängten basischen funktionellen Gruppen wie Anionenaustauschmembran (AEM, en: anion exchange membrane).
Dieses Dokument gilt für Wasserstofferzeuger, die für industrielle, gewerbliche und häusliche Anwendungen sowohl im Innenraum als auch im Freien vorgesehen sind.
Dieses Dokument enthält Hinweise zu Wasserstofferzeugern, die auch Sauerstoff für industrielle und gewerb
liche Anwendungen bereitstellen; hierzu können jedoch zusätzliche Überlegungen notwendig sein.
Folgendes wird aus dem Anwendungsbereich dieses Dokuments ausgeschlossen:
- Wasserstofferzeuger für häusliche Anwendungen, die als Produkt auch Sauerstoff bereitstellen;
- Wasserstofferzeuger, die auch zur Elektrizitätserzeugung genutzt werden können, wie z.B. reversible Brennstoffzellen (siehe IEC62282-8-101, IEC62282-8-102 und IEC62282-8-201);
- Wasserstofferzeuger, die Festoxid-Elektrolyte nutzen (siehe IEC62282-8-101 und IEC62282-8-201).

Générateurs d'hydrogène utilisant le procédé d'électrolyse de l'eau - Partie 1: Sécurité (ISO 22734-1:2025)

Le présent document spécifie les exigences de sécurité des appareils ou systèmes de production d'hydrogène gazeux qui utilisent des réactions électrochimiques pour électrolyser l'eau afin de produire de l'hydrogène, ci-après appelés générateurs d'hydrogène.

Naprave za proizvodnjo vodika z elektrolizo vode - 1. del: Varnost (ISO 22734-1:2025)

General Information

Status
Published
Public Enquiry End Date
02-Jul-2024
Publication Date
19-Aug-2025
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
24-Jul-2025
Due Date
28-Sep-2025
Completion Date
20-Aug-2025

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SLOVENSKI STANDARD
01-september-2025
Naprave za proizvodnjo vodika z elektrolizo vode - 1. del: Varnost (ISO 22734-
1:2025)
Hydrogen generators using water electrolysis - Part 1: Safety (ISO 22734-1:2025)
Wasserstofferzeuger auf Grundlage der Elektrolyse von Wasser - Teil 1:
Sicherheitsanforderungen (ISO 22734-1:2025)
Générateurs d'hydrogène utilisant le procédé d'électrolyse de l'eau - Partie 1: Sécurité
(ISO 22734-1:2025)
Ta slovenski standard je istoveten z: EN ISO 22734-1:2025
ICS:
71.100.20 Industrijski plini Gases for industrial
application
71.120.99 Druga oprema za kemijsko Other equipment for the
industrijo chemical industry
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN ISO 22734-1

NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2025
ICS 71.100.20; 71.120.99
English version
Hydrogen generators using water electrolysis - Part 1:
Safety (ISO 22734-1:2025)
Générateurs d'hydrogène utilisant le procédé Wasserstofferzeuger auf Grundlage der Elektrolyse von
d'électrolyse de l'eau - Partie 1: Sécurité (ISO 22734- Wasser - Teil 1: Sicherheitsanforderungen (ISO 22734-
1:2025) 1:2025)
This European Standard was approved by CEN on 29 June 2025.

CEN and CENELEC 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. Up-to-date lists and bibliographical
references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to
any CEN and CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN and CENELEC members are the national standards bodies and national electrotechnical committees 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.

CEN-CENELEC Management Centre:
Rue de la Science 23, B-1040 Brussels
© 2025 CEN/CENELEC All rights of exploitation in any form and by any means
Ref. No. EN ISO 22734-1:2025 E
reserved worldwide for CEN national Members and for
CENELEC Members.
Contents Page
European foreword . 3

European foreword
This document (EN ISO 22734-1:2025) has been prepared by Technical Committee ISO/TC 197
"Hydrogen technologies" in collaboration with Technical Committee CEN-CENELEC/ JTC 6 “Hydrogen in
energy systems” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2026, and conflicting national standards shall
be withdrawn at the latest by January 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN-CENELEC 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/national committee. A complete listing of these bodies can be found on the CEN and CENELEC
websites.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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 the
United Kingdom.
Endorsement notice
The text of ISO 22734-1:2025 has been approved by CEN-CENELEC as EN ISO 22734-1:2025 without
any modification.
International
Standard
ISO 22734-1
First edition
Hydrogen generators using water
2025-07
electrolysis —
Part 1:
Safety
Générateurs d'hydrogène utilisant le procédé d'électrolyse
de l'eau —
Partie 1: Sécurité
Reference number
ISO 22734-1:2025(en) © ISO 2025

ISO 22734-1:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 22734-1:2025(en)
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
1.1 General .1
1.2 Applicable hydrogen generators .1
1.3 Applicable ion transport mediums .1
1.4 Applicability to large scale hydrogen generators .1
1.5 Applicability to certain hydrogen generator subassemblies .2
1.6 Excluded hydrogen generators .2
2 Normative references . 2
3 Terms and definitions . 4
4 Requirements . 10
4.1 Operating conditions .10
4.1.1 Energy input specification .10
4.1.2 Feed water specifications .10
4.1.3 Ambient environment .11
4.1.4 Protective gas .11
4.1.5 Delivery of hydrogen. 12
4.1.6 Delivery of oxygen . . 12
4.1.7 Hydrogen venting . 12
4.1.8 Oxygen venting . 13
4.2 Risk management .14
4.2.1 General requirements .14
4.2.2 Fire and explosion hazard protection requirements .16
4.2.3 Pressure safety requirements .19
4.2.4 Temperature safety requirements . 20
4.2.5 Spillage, overflow, and drain . 20
4.2.6 Protection of service and maintenance personnel .21
4.3 Chemical reaction equipment .21
4.3.1 General .21
4.3.2 Electrochemical Cells and Stacks .21
4.3.3 Oxygen removal catalytic reactors . 22
4.3.4 Hydrogen removal catalytic reactors . 23
4.3.5 Gas drying systems . 23
4.4 Mechanical equipment . 23
4.4.1 General requirements . 23
4.4.2 General materials requirements .24
4.4.3 Pressure-bearing equipment . 25
4.4.4 Pressure relief devices .27
4.4.5 Fans and ventilators . 28
4.4.6 Heat transfer system . 28
4.5 Electrical equipment and wiring . 28
4.5.1 General requirements . 28
4.5.2 Grounding and bonding . . . 29
4.5.3 Touch current and protective conductor current . 29
4.5.4 Overcurrent protection .
...

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