ISO 20602:2019
(Main)Ships and marine technology — Check valves for use in low temperature applications — Design and testing requirements
Ships and marine technology — Check valves for use in low temperature applications — Design and testing requirements
This document specifies requirements of design, manufacture, and test methods for cryogenic check valves to have excellent quality of leakage stability in very low temperature environments (−50 °C to −196 °C).
Navires et technologie maritime — Clapets de retenue destinés aux applications à basse température — Exigences de conception et d'essai
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INTERNATIONAL ISO
STANDARD 20602
First edition
2019-05
Ships and marine technology — Check
valves for use in low temperature
applications — Design and testing
requirements
Navires et technologie maritime — Clapets de retenue destinés aux
applications à basse température — Exigences de conception et d'essai
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Pressure temperature rating . 3
4.1 Types of fluids . 3
4.2 Working pressure and designed temperature . 3
5 Design . 3
5.1 General structure of a check valve . 3
5.2 Materials — General . 3
5.3 Body . 4
5.3.1 Materials . 4
5.3.2 Manufacturing . 4
5.4 Cover (bonnet) . 5
5.4.1 Types . 5
5.4.2 Materials . 5
5.5 Disc . 5
5.5.1 Types . 5
5.5.2 Materials . 5
5.6 Gasket . 5
5.7 Valve Seat . 5
5.7.1 Types . 5
5.7.2 Materials . 6
5.8 Hinges and hinge pin (as applicable). 6
5.8.1 Types . 6
5.8.2 Materials . 6
5.9 Bolts and nuts . 6
5.9.1 Types . 6
5.9.2 Materials . 6
6 Surface treatment . 6
7 Welding and heat treatment . 6
7.1 Welding . 6
7.2 Heat treatment . 6
8 Test and inspection . 6
8.1 Material test . 7
8.2 Non-destructive inspection . 7
8.2.1 Radiographic testing (RT) . 7
8.2.2 Penetrant testing (PT) . 7
8.2.3 Ultrasonic testing (UT) . 8
8.2.4 Retest . 8
8.2.5 Reporting test result . 8
8.3 Dimension check . 8
8.4 Visual inspection . 8
8.5 Heat treatment inspection . 8
8.6 Pressure tests . 8
8.7 Fire safety test . 9
8.8 Cryogenic tests . 9
8.8.1 Test scope . 9
8.8.2 Test procedure . 9
8.8.3 Submission of test result .10
9 Marking .11
Annex A (informative) Cryogenic check valves — Examples .12
iv © ISO 2019 – All rights reserved
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 on 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 the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 3, Piping and machinery.
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.
INTERNATIONAL STANDARD ISO 20602:2019(E)
Ships and marine technology — Check valves for use
in low temperature applications — Design and testing
requirements
1 Scope
This document specifies requirements of design, manufacture, and test methods for cryogenic check
valves to have excellent quality of leakage stability in very low temperature environments (−50 °C to
−196 °C).
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 5209, General purpose industrial valves — Marking
ISO 28921-1, Industrial valves — Isolating valv
...
INTERNATIONAL ISO
STANDARD 20602
First edition
2019-05
Ships and marine technology — Check
valves for use in low temperature
applications — Design and testing
requirements
Navires et technologie maritime — Clapets de retenue destinés aux
applications à basse température — Exigences de conception et d'essai
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Pressure temperature rating . 3
4.1 Types of fluids . 3
4.2 Working pressure and designed temperature . 3
5 Design . 3
5.1 General structure of a check valve . 3
5.2 Materials — General . 3
5.3 Body . 4
5.3.1 Materials . 4
5.3.2 Manufacturing . 4
5.4 Cover (bonnet) . 5
5.4.1 Types . 5
5.4.2 Materials . 5
5.5 Disc . 5
5.5.1 Types . 5
5.5.2 Materials . 5
5.6 Gasket . 5
5.7 Valve Seat . 5
5.7.1 Types . 5
5.7.2 Materials . 6
5.8 Hinges and hinge pin (as applicable). 6
5.8.1 Types . 6
5.8.2 Materials . 6
5.9 Bolts and nuts . 6
5.9.1 Types . 6
5.9.2 Materials . 6
6 Surface treatment . 6
7 Welding and heat treatment . 6
7.1 Welding . 6
7.2 Heat treatment . 6
8 Test and inspection . 6
8.1 Material test . 7
8.2 Non-destructive inspection . 7
8.2.1 Radiographic testing (RT) . 7
8.2.2 Penetrant testing (PT) . 7
8.2.3 Ultrasonic testing (UT) . 8
8.2.4 Retest . 8
8.2.5 Reporting test result . 8
8.3 Dimension check . 8
8.4 Visual inspection . 8
8.5 Heat treatment inspection . 8
8.6 Pressure tests . 8
8.7 Fire safety test . 9
8.8 Cryogenic tests . 9
8.8.1 Test scope . 9
8.8.2 Test procedure . 9
8.8.3 Submission of test result .10
9 Marking .11
Annex A (informative) Cryogenic check valves — Examples .12
iv © ISO 2019 – All rights reserved
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 on 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 the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 3, Piping and machinery.
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.
INTERNATIONAL STANDARD ISO 20602:2019(E)
Ships and marine technology — Check valves for use
in low temperature applications — Design and testing
requirements
1 Scope
This document specifies requirements of design, manufacture, and test methods for cryogenic check
valves to have excellent quality of leakage stability in very low temperature environments (−50 °C to
−196 °C).
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 5209, General purpose industrial valves — Marking
ISO 28921-1, Industrial valves — Isolating valv
...
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