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Standard
ISO 23555-3
First edition
Gas pressure safety and control
2024-06
devices for use in gas transmission,
distribution and installations for
inlet pressures up to and including
10 MPa —
Part 3:
Safety shut-off devices
Dispositifs de commande et de sécurité de la pression de gaz
destinés à être utilisés dans les installations de transport, de
distribution et de stockage de gaz pour des pressions en entrée
jusqu'à 10 MPa inclus —
Partie 3: Dispositifs d'arrêt de sécurité
Reference number
ISO 23555-3:2024(en) © ISO 2024
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ISO 23555-3:2024(en)
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© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
© ISO 2024 – All rights reserved
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ISO 23555-3:2024(en)
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 2
3 Terms, definitions and symbols . 2
3.1 Terms and definitions .2
3.1.1 Terms related to safety shut-off devices in general .2
3.1.2 Terms related to components of safety shut-off devices .3
3.1.3 Terms related to variables in the controlling process .7
3.1.4 Terms related to the controlled process and to the set value of the trip pressure .8
3.1.5 Terms related to functional performances .8
3.1.6 Terms related to the design and tests .10
3.2 Symbols, abbreviated terms and units .10
4 Classification . 10
4.1 General .10
4.2 Temperature classes .11
4.3 Strength types .11
4.4 Fail conditions .11
5 Materials .
...