ISO 21157:2018

INTERNATIONAL ISO
STANDARD 21157
First edition
2018-11
Ships and marine technology — Ball
valves for use in low temperature
applications — Design and testing
requirements
Navires et technologie maritime — Robinets à boisseau sphérique
destinés aux applications à basse température — Exigences de
conception et d'essai
Reference number
ISO 21157:2018(E)
©
ISO 2018

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ISO 21157:2018(E)

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© ISO 2018
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Published in Switzerland
ii © ISO 2018 – All rights reserved

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ISO 21157:2018(E)

Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Pressure-temperature rating . 3
5 Structure . 3
5.1 General . 3
5.1.1 Structure . 3
5.1.2 Materials . 3
5.2 Design and materials of the body. 4
5.2.1 Design . 4
5.2.2 Materials . 4
5.2.3 Manufacturing . 4
5.3 Design and materials of the extended bonnet . 5
5.3.1 Design . 5
5.3.2 Materials . 5
5.4 Design and materials of ball . 5
5.4.1 Design . 5
5.4.2 Materials .
...