ISO 22734:2019
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.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 Operating conditions
4.1.1 Energy consumption
4.1.2 Feed water specifications
4.1.3 Ambient environment
4.1.4 Purge gas
4.1.5 Oxygen venting
4.1.6 Hydrogen venting
4.1.7 Delivery of hydrogen
4.1.8 Delivery of oxygen
4.2 Risk management
4.3 Mechanical equipment
4.3.1 General requirements
4.3.2 General materials requirements
4.3.3 Enclosure requirements
4.3.4 Pressure-bearing components
4.3.5 Fans and ventilators
4.3.6 Pumps
4.3.7 Heat transfer system
4.3.8 Connection to potable water
4.3.9 Environmental tolerance
4.3.10 Equipment temperature limits and resistance to heat
4.3.11 Spillage, overflow, and drain
4.4 Electrical equipment, wiring and ventilation
4.4.1 Fire and explosion hazard protection requirements
4.4.2 Electrical equipment
4.5 Control systems
4.5.1 General
4.5.2 Safety control circuit
4.5.3 Control function in the event of failure
4.5.4 Programmable electronic equipment
4.5.5 Start
4.5.6 Emergency-stop
4.5.7 Stop
4.5.8 Self-correctable conditions
4.5.9 Interconnected installations
4.5.10 Safety components
4.5.11 Remote control systems
4.5.12 Alarms
4.5.13 Purge gas quantity
4.5.14 Reset
4.5.15 Suspension of safeguards
4.6 Ion transport medium
4.6.1 Electrolyte
4.6.2 Membrane
4.7 Protection of service personnel
5 Test methods
5.1 General
5.2 Type (qualification) tests
5.2.1 General requirements
5.2.2 Basic test arrangements
5.2.3 Reference test conditions
5.2.4 Electrical tests
5.2.5 Pressure test
5.2.6 Leakage test
5.2.7 Dilution tests
5.2.8 Protection against the spread of fire tests
5.2.9 Temperature tests
5.2.10 Environmental test
5.2.11 Performance tests
5.2.12 Spillage, overflow, and drain test
5.2.13 Mechanical strength
5.2.14 Stability test
5.2.15 Vent tests
5.2.16 Sound level test
5.3 Routine tests
5.3.1 General requirements
5.3.2 Continuity of the protective bonding circuit test
5.3.3 Voltage test
5.3.4 Functional tests
5.3.5 Leakage test
6 Marking and labelling
6.1 General requirements
6.2 Hydrogen generator marking
6.3 Marking of components
6.4 Warning signs
7 Documentation accompanying the hydrogen generator
7.1 General
7.2 Hydrogen generator ratings
7.3 Hydrogen generator installation
7.3.1 General
7.3.2 Specific requirements for permanently connected hydrogen generators
7.3.3 Specific requirements for indoor installations
7.3.4 Specific requirements for built-in hydrogen generator appliances
7.3.5 Lifting
7.4 Hydrogen generator operation
7.5 Hydrogen generator maintenance
Annex A (informative) Hydrogen-assisted corrosion
Annex B (informative) Flammability limits of hydrogen
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 Operating conditions
4.1.1 Energy consumption
4.1.2 Feed water specifications
4.1.3 Ambient environment
4.1.4 Purge gas
4.1.5 Oxygen venting
4.1.6 Hydrogen venting
4.1.7 Delivery of hydrogen
4.1.8 Delivery of oxygen
4.2 Risk management
4.3 Mechanical equipment
4.3.1 General requirements
4.3.2 General materials requirements
4.3.3 Enclosure requirements
4.3.4 Pressure-bearing components
4.3.5 Fans and ventilators
4.3.6 Pumps
4.3.7 Heat transfer system
4.3.8 Connection to potable water
4.3.9 Environmental tolerance
4.3.10 Equipment temperature limits and resistance to heat
4.3.11 Spillage, overflow, and drain
4.4 Electrical equipment, wiring and ventilation
4.4.1 Fire and explosion hazard protection requirements
4.4.2 Electrical equipment
4.5 Control systems
4.5.1 General
4.5.2 Safety control circuit
4.5.3 Control function in the event of failure
4.5.4 Programmable electronic equipment
4.5.5 Start
4.5.6 Emergency-stop
4.5.7 Stop
4.5.8 Self-correctable conditions
4.5.9 Interconnected installations
4.5.10 Safety components
4.5.11 Remote control systems
4.5.12 Alarms
4.5.13 Purge gas quantity
4.5.14 Reset
4.5.15 Suspension of safeguards
4.6 Ion transport medium
4.6.1 Electrolyte
4.6.2 Membrane
4.7 Protection of service personnel
5 Test methods
5.1 General
5.2 Type (qualification) tests
5.2.1 General requirements
5.2.2 Basic test arrangements
5.2.3 Reference test conditions
5.2.4 Electrical tests
5.2.5 Pressure test
5.2.6 Leakage test
5.2.7 Dilution tests
5.2.8 Protection against the spread of fire tests
5.2.9 Temperature tests
5.2.10 Environmental test
5.2.11 Performance tests
5.2.12 Spillage, overflow, and drain test
5.2.13 Mechanical strength
5.2.14 Stability test
5.2.15 Vent tests
5.2.16 Sound level test
5.3 Routine tests
5.3.1 General requirements
5.3.2 Continuity of the protective bonding circuit test
5.3.3 Voltage test
5.3.4 Functional tests
5.3.5 Leakage test
6 Marking and labelling
6.1 General requirements
6.2 Hydrogen generator marking
6.3 Marking of components
6.4 Warning signs
7 Documentation accompanying the hydrogen generator
7.1 General
7.2 Hydrogen generator ratings
7.3 Hydrogen generator installation
7.3.1 General
7.3.2 Specific requirements for permanently connected hydrogen generators
7.3.3 Specific requirements for indoor installations
7.3.4 Specific requirements for built-in hydrogen generator appliances
7.3.5 Lifting
7.4 Hydrogen generator operation
7.5 Hydrogen generator maintenance
Annex A (informative) Hydrogen-assisted corrosion
Annex B (informative) Flammability limits of hydrogen
Bibliography