ISO 20421-1:2019

Cryogenic vessels — Large transportable vacuum-insulated vessels — Part 1: Design, fabrication, inspection and testing

This document specifies requirements for the design, fabrication, inspection and testing of large transportable vacuum-insulated cryogenic vessels of more than 450 l volume, which are permanently (fixed tanks) or not permanently (demountable tanks and portable tanks) attached to a means of transport, for one or more modes of transport. This document applies to large transportable vacuum-insulated cryogenic vessels for fluids specified in 3.1 and does not apply to vessels designed for toxic fluids. This document does not include the general vehicle requirements, e.g. running gear, brakes, lighting, etc. NOTE 1 This document does not cover specific requirements for refillable liquid-hydrogen tanks that are primarily dedicated as fuel tanks in vehicles. For fuel tanks used in land vehicles, see ISO 13985. NOTE 2 This document does not cover specific requirements for refillable liquid hydrogen and LNG tanks that are primarily dedicated as fuel tanks in vehicles. For fuel tanks used in vehicles, see ISO 13985.

Récipients cryogéniques — Récipients transportables isolés sous vide de grande contenance — Partie 1: Conception, fabrication, inspection et essais

General Information

• Status: Published
• Publication Date: 18-Jun-2019
• ICS: 23.020.40 - Cryogenic vessels
• Technical Committee: ISO/TC 220 - Cryogenic vessels
• Drafting Committee: ISO/TC 220/WG 1 - Design and construction

Relations

• Amended By: ISO 20421-1:2019/Amd 1:2022 - Cryogenic vessels — Large transportable vacuum-insulated vessels — Part 1: Design, fabrication, inspection and testing — Amendment 1
• Effective Date: 01-Jan-2022
• Revises: ISO 20421-1:2006 - Cryogenic vessels — Large transportable vacuum-insulated vessels — Part 1: Design, fabrication, inspection and testing
• Effective Date: 04-Nov-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 20421-1
Second edition
2019-06
Cryogenic vessels — Large
transportable vacuum-insulated
vessels —
Part 1:
Design, fabrication, inspection and
testing
Récipients cryogéniques — Récipients transportables isolés sous vide
de grande contenance —
Partie 1: Conception, fabrication, inspection et essais
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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
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 . 2
4 Symbols . 5
5 General requirements . 7
6 Mechanical loads . 7
6.1 General . 7
6.2 Load during the pressure test . 7
7 Chemical effects . 8
8 Thermal conditions . 8
9 Materials . 8
9.1 Selection of materials . 8
9.2 Inspection documentation . 8
10 Design . 9
10.1 Design options . 9
10.1.1 General. 9
10.1.2 Design by calculation . 9
10.1.3 Design by calculation and pressure strengthening . 9
10.1.4 Design of components by calculation supplemented with experimental methods 9
10.2 Common design requirements . 9
10.2.1 General. 9
10.2.2 Design specification .10
10.2.3 Design loads .11
10.2.4 Fatigue .15
10.2.5 Corrosion allowance .15
10.2.6 Inspection openings .16
10.2.7 Pressure relief .16
10.2.8 Valves .17
10.2.9 Insulation .17
10.2.10 Degree of filling .17
10.2.11 Electrical continuity .17
10.3 Design by calculation .17
10.3.1 General.17
10.3.2 Inner vessel .17
10.3.3 Outer jacket .20
10.3.4 Attachments .21
10.3.5 Piping and accessories .21
10.3.6 Calculation formula .21
10.3.7 Calculations for operating loads .45
11 Fabrication .46
11.1 General .46
11.2 Cutting .46
11.3 Cold forming .46
11.3.1 Austenitic stainless steel .46
11.3.2 Ferritic steel .47
11.3.3 Aluminium or aluminium alloy .48
11.4 Hot forming .48
11.4.1 General.48
11.4.2 Austenitic stainless steel .48
11.4.3 Ferritic steel .48
11.4.4 Aluminium or aluminium alloy .48
11.5 Manufacturing tolerances .48
11.5.1 General.48
11.5.2 Plate alignment .49
11.5.3 Thickness .50
11.5.4 Dished ends .50
11.5.5 Cylinders .50
11.6 Welding .53
11.6.1 General.53
11.6.2 Qualification .53
11.6.3 Temporary attachments .53
11.6.4 Welded joints .53
11.7 Non-welded joints .54
12 Inspection and testing .54
12.1 Quality plan .54
12.1.1 General.54
12.1.2 Inspection stages during manufacture of an inner vessel .54
12.1.3 Additional inspection stages during manufacture of a large transportable
cryogenic vessel .55
12.2 P
...