ISO 22734:2019

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 2019
© ISO 2019
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Published in Switzerland
ii © ISO 2019 – All rights reserved

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
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 .
...