ISO 22734:2019
(Main)Hydrogen generators using water electrolysis — Industrial, commercial, and residential applications
Hydrogen generators using water electrolysis — Industrial, commercial, and residential applications
This document defines the construction, safety, and performance requirements of modular or factory-matched hydrogen gas generation appliances, herein referred to as hydrogen generators, using electrochemical reactions to electrolyse water to produce hydrogen. This document is applicable to hydrogen generators that use the following types of ion transport medium: — group of aqueous bases; — group of aqueous acids; — solid polymeric materials with acidic function group additions, such as acid proton exchange membrane (PEM); — solid polymeric materials with basic function group additions, such as anion exchange membrane (AEM). This document is applicable to hydrogen generators intended for industrial and commercial uses, and indoor and outdoor residential use in sheltered areas, such as car-ports, garages, utility rooms and similar areas of a residence. Hydrogen generators that can also be used to generate electricity, such as reversible fuel cells, are excluded from the scope of this document. Residential hydrogen generators that also supply oxygen as a product are excluded from the scope of this document.
Générateurs d'hydrogène utilisant le procédé de l'électrolyse de l'eau — Applications industrielles, commerciales et résidentielles
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 22734
First edition
2019-09
Hydrogen generators using water
electrolysis — Industrial, commercial,
and residential applications
Générateurs d'hydrogène utilisant le procédé de l'électrolyse de
l'eau — Applications industrielles, commerciales et résidentielles
Reference number
ISO 22734:2019(E)
©
ISO 2019
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ISO 22734:2019(E)
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© ISO 2019
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ISO 22734:2019(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 4
4 Requirements . 7
4.1 Operating conditions . 7
4.1.1 Energy consumption . 7
4.1.2 Feed water specifications . 7
4.1.3 Ambient environment . 7
4.1.4 Purge gas . . . 7
4.1.5 Oxygen venting . 8
4.1.6 Hydrogen venting . 8
4.1.7 Delivery of hydrogen . 9
4.1.8 Delivery of oxygen . 9
4.2 Risk management . 9
4.3 Mechanical equipment . 9
4.3.1 General requirements . 9
4.3.2 General materials requirements .10
4.3.3 Enclosure requirements .11
4.3.4 Pressure-bearing components .13
4.3.5 Fans and ventilators .16
4.3.6 Pumps .16
4.3.7 Heat transfer system.17
4.3.8 Connection to potable water .17
4.3.9 Environmental tolerance .17
4.3.10 Equipment temperature limits and resistance to heat .17
4.3.11 Spillage, overflow, and drain .17
4.4 Electrical equipment, wiring and ventilation .18
4.4.1 Fire and explosion hazard protection requirements .18
4.4.2 Electrical equipment .20
4.5 Control systems .21
4.5.1 General.21
4.5.2 Safety control circuit .23
4.5.3 Control function in the event of failure .23
4.5.4 Programmable electronic equipment .23
4.5.5 Start .23
4.5.6 Emergency-stop .24
4.5.7 Stop .24
4.5.8 Self-correctable conditions .24
4.5.9 Interconnected installations .25
4.5.10 Safety components .25
4.5.11 Remote control systems .25
4.5.12 Alarms .25
4.5.13 Purge gas quantity .25
4.5.14 Reset .25
4.5.15 Suspension of safeguards .26
4.6 Ion transport medium .26
4.6.1 Electrolyte .26
4.6.2 Membrane .26
4.7 Protection of service personnel .27
5 Test methods .27
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ISO 22734:2019(E)
5.1 General .27
5.2 Type (qualification) tests .27
5.2.1 General requirements .27
5.2.2 Basic test arrangements .27
5.2.3 Reference test conditions .27
5.2.4 Electrical tests .29
5.2.5 Pressure test .31
5.2.6 Leakage test . .32
5.2.7 Dilution tests .33
5.2.8 Protection against the spread of fire tests .34
5.2.9 Temperature tests .34
5.2.10 Environmental test.34
5.2.11 Performance tests .35
5.2.12 Spillage, overflow, and drain test .35
5.2.13 Mechanical strength .35
5.2.14 Stability test .35
5.2.15 Vent tests .35
5.2.16 Sound level test .37
5.3 Routine tests .38
5.3.1 General requirements .38
5.3.2 Continuity of the protective bonding circuit test .38
5.3.3 Voltage test .38
5.3.4 Functional tests .38
5.3.5 Leakage test . .38
6 Marking and labelling .38
6.1 General requirements .38
6.2 Hydrogen generator marking .39
6.3 Marking of components .39
6.4 Warning signs .39
7 Documentation accompanying the hydrogen generator .40
7.1 General .40
7.2 Hydrogen generator ratings .40
7.3 Hydrogen generator installation .41
7.3.1 General.41
7.3.2 Specific requirements for permanently connected hydrogen generators .41
7.3.3 Specific requirements for indoor installations .41
7.3.4 Specific requirements for built-in hydrogen generator appliances .42
7.3.5 Lifting . .42
7.4 Hydrogen generator operation .42
7.5 Hydrogen generator maintenance .43
Annex A (informative) Hydrogen-assisted corrosion .44
Annex B (informative) Flammability limits of hydrogen .45
Bibliography .46
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ISO 22734:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 197, Hydrogen technologies.
This first edition cancels and replaces ISO 22734-1:2008 and ISO 22734-2:2011, which have been
combined and technically revised. The technical revisions add Alkaline Exchange Membranes to the
document scope, update Normative references, clarify pressure terminology definitions, and simplify
Risk Management requirements. This document is reorganized into 7 clauses, where all design
requirements are now found in Clause 4, and all test methods are now found in Clause 5.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
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ISO 22734:2019(E)
Introduction
In a hydrogen generator electrochemical cell, electricity causes dissociation of water into hydrogen
and oxygen molecules. An electric current is passed between two electrodes separated by a conductive
electrolyte or “ion transport medium”, producing hydrogen at the negative electrode (cathode) and
oxygen at the positive electrode (anode). As water is H O, twice the volume of hydrogen is produced
2
compared with oxygen.
Hydrogen gas produced using electrolysis technology can be utilized immediately or stored for later use.
The cell(s), and electrical, gas processing, ventilation, cooling, monitoring equipment and controls are
contained within an enclosure. Gas compression, feed water conditioning, and auxiliary equipment may
also be included.
This document is intended to be used for certification purposes.
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INTERNATIONAL STANDARD ISO 22734:2019(E)
Hydrogen generators using water electrolysis — Industrial,
commercial, and residential applications
1 Scope
This document defines the construction, safety, and performance requirements of modular or factory-
matched hydrogen gas generation appliances, herein referred to as hydrogen generators, using
electrochemical reactions to electrolyse water to produce hydrogen.
This document is applicable to hydrogen generators that use the following types of ion transport medium:
— group of aqueous bases;
— group of aqueous acids;
— solid polymeric materials with acidic function group additions, such as acid proton exchange
membrane (PEM);
— solid polymeric materials with basic function group additions, such as anion exchange membrane
(AEM).
This document is applicable to hydrogen generators intended for industrial and commercial uses, and
indoor and outdoor residential use in sheltered areas, such as car-ports, garages, utility rooms and
similar areas of a residence.
Hydrogen generators that can also be used to generate electricity, such as reversible fuel cells, are
excluded from the scope of this document.
Residential hydrogen generators that also supply oxygen as a product are excluded from the scope of
this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1182, Reaction to fire tests for products — Non-combustibility test
ISO 3746, Acoustics — Determination of sound power levels and sound energy levels of noise sources using
sound pressure — Survey method using an enveloping measurement surface over a reflecting plane
ISO 3864-2, Graphical symbols — Safety colours and safety signs — Part 2: Design principles for product
safety labels
ISO 4126-1, Safety devices for protection against excessive pressure — Part 1: Safety valves
ISO 4126-2, Safety devices for protection against excessive pressure — Part 2: Bursting disc safety devices
ISO 4126-6, Safety devices for protection against excessive pressure — Part 6: Application, selection and
installation of bursting disc safety devices
ISO 7010, Graphical symbols — Safety colours and safety signs — Registered safety signs
ISO 7866, Gas cylinders — Refillable seamless aluminium alloy gas cylinders — Design, construction
and testing
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ISO 22734:2019(E)
ISO 9300, Measurement of gas flow by means of critical flow Venturi nozzles
ISO 9951, Measurement of gas flow in closed conduits — Turbine meters
ISO 9614-1, Acoustics — Determination of sound power levels of noise sources using sound intensity —
Part 1: Measurement at discrete points
ISO 9809-1, Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing —
Part 1: Quenched and tempered steel cylinders with tensile strength less than 1 100 MPa
ISO 10286, Gas cylinders — Terminology
ISO 10790, Measurement of fluid flow in closed conduits — Guidance to the selection, installation and use of
Coriolis flowmeters (mass flow, density and volume flow measurements)
ISO 11119-1, Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and
testing — Part 1: Hoop wrapped fibre reinforced composite gas cylinders and tubes up to 450 l
ISO 11119-2, Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and
testing — Part 2: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450 l with load-
sharing metal liners
ISO 11119-3, Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and
testing — Part 3: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450L with non-
load-sharing metallic or non-metallic liners
ISO 12100, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 12499, Industrial fans — Mechanical safety of fans — Guarding
ISO 13709, Centrifugal pumps for petroleum, petrochemical and natural gas industries
ISO 13850, Safety of machinery — Emergency stop function — Principles for design
ISO 13854, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body
ISO 13857, Safety of machinery — Safety distances to prevent hazard zones being reached by upper and
lower limbs
ISO 14511, Measurement of fluid flow in closed conduits — Thermal mass flowmeters
ISO 14847, Rotary positive displacement pumps — Technical requirements
ISO 15534-1, Ergonomic design for the safety of machinery — Part 1: Principles for determining the
dimensions required for openings for whole-body access into machinery
ISO 15534-2, Ergonomic design for the safety of machinery — Part 2: Principles for determining the
dimensions required for access openings
ISO 15649, Petroleum and natural gas industries — Piping
ISO 16111, Transportable gas storage devices — Hydrogen absorbed in reversible metal hydride
ISO 16528-1, Boilers and pressure vessels — Part 1: Performance requirements
ISO 17398, Safety colours and safety signs — Classification, performance and durability of safety signs
ISO 26142, Hydrogen detection apparatus — Stationary applications
IEC 31010:2019, Risk management — Risk assessment techniques
IEC 60068-2-18:2017, Environmental testing — Part 2-18: Tests — Test R and guidance: Water
IEC 60079 (all parts), Explosive atmospheres
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ISO 22734:2019(E)
IEC 60204-1:2016, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60335-1:2010, Household and similar electrical appliances — Safety — Part 1: General requirements
IEC 60335-2-41, Household and similar electrical appliances — Safety — Part 2-41: Particular requirements
for pumps
IEC 60335-2-51, Household and similar electrical appliances — Safety — Part 2-51: Particular requirements
for stationary circulation pumps for heating and service water installations
IEC 60335-2-80, Household and similar electrical appliances — Safety — Part 2-80: Particular requirements
for fans
IEC 60364-4-41, Low voltage electrical installations — Part 4-41: Protection for safety — Protection
against electric shock
IEC 60364-4-43, Low-voltage electrical installations — Part 4-43: Protection for safety — Protection
against overcurrent
IEC 60445, Basic and safety principles for man-machine interface, marking and identification —
Identification of equipment terminals, conductor terminations and conductors
IEC 60529, Degrees of protection provided by enclosures (IP Codes)
IEC 60534 (all parts), Industrial-process control valves
IEC 60695-11-10, Fire hazard testing — Part 11-10: Test flames — 50 W horizontal and vertical flame
test methods
IEC 60695-11-20, Fire hazard testing — Part 11-20: Test flames — 500 W Flame test methods
IEC 60730-1:2013, Automatic electrical controls for household and similar use — Part 1: General
requirements
IEC 60947-1, Low-voltage switchgear and controlgear — Part 1: General rules
IEC 60950-1:2005, Information technology equipment — Safety — Part 1: General requirements
IEC 60998-2-2, Connecting devices for low-voltage circuits for household and similar purposes — Part 2-2:
Particular requirements for connecting devices as separate entities with screwless-type clamping units
IEC 60999-1, Connecting devices — Elec
...
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