SIST EN ISO 24490:2026

SLOVENSKI STANDARD
01-januar-2026
Nadomešča:
SIST EN ISO 24490:2017
Kriogene posode - Centrifugalne črpalke za kriogeno območje (ISO 24490:2025)
Cryogenic vessels - Centrifugal pumps for cryogenic service (ISO 24490:2025)
Kryo-Behälter - Pumpen für den Kryo-Betrieb (ISO 24490:2025)
Récipients cryogéniques - Pompes centrifuges pour service cryogénique (ISO
24490:2025)
Ta slovenski standard je istoveten z: EN ISO 24490:2025
ICS:
23.020.40 Proti mrazu odporne posode Cryogenic vessels
(kriogenske posode)
23.080 Črpalke Pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 24490
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2025
EUROPÄISCHE NORM
ICS 23.020.40 Supersedes EN ISO 24490:2016
English Version
Cryogenic vessels - Centrifugal pumps for cryogenic
service (ISO 24490:2025)
Récipients cryogéniques - Pompes centrifuges pour Kryo-Behälter - Pumpen für den Kryo-Betrieb (ISO
service cryogénique (ISO 24490:2025) 24490:2025)
This European Standard was approved by CEN on 4 November 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 24490:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 24490:2025) has been prepared by Technical Committee ISO/TC 220
"Cryogenic vessels" in collaboration with Technical Committee CEN/TC 268 “Cryogenic vessels and
specific hydrogen technologies applications” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2026, and conflicting national standards shall be
withdrawn at the latest by May 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 24490:2016.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 24490:2025 has been approved by CEN as EN ISO 24490:2025 without any modification.

International
Standard
ISO 24490
Third edition
Cryogenic vessels — Centrifugal
2025-10
pumps for cryogenic service
Récipients cryogéniques — Pompes centrifuges pour service
cryogénique
Reference number
ISO 24490:2025(en) © ISO 2025
ISO 24490:2025(en)
© ISO 2025
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 24490:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements for pumps . 2
4.1 General .2
4.2 Materials .2
4.2.1 General .2
4.2.2 Mechanical properties at low temperature .2
4.2.3 Corrosion resistance .2
4.2.4 Oxygen and oxidizing fluids compatibility .3
4.2.5 Hydrogen compatibility .3
4.3 Design .3
4.3.1 Pressure-containing parts .3
4.3.2 Performance .3
4.3.3 Clearances .4
4.3.4 Prevention of rubbing .4
4.3.5 Fastenings .4
4.3.6 Warm bearings .4
4.3.7 Cold bearings .4
4.3.8 Bearing lubrication .4
4.3.9 Shaft seals . .4
4.3.10 Purging .5
4.3.11 Prevention of particle contamination .5
4.3.12 Specific requirement for flammable cryogenic fluids .5
4.3.13 Protection against over-pressurization.5
4.3.14 Pump motors .5
5 Test procedures . 6
5.1 Prototype testing .6
5.1.1 General .6
5.1.2 Design evaluation .6
5.1.3 Performance evaluation . .6
5.1.4 Initial tests .6
5.1.5 Cryogenic tests .6
5.2 Production testing .7
5.2.1 General .7
5.2.2 Hydrostatic pressure test .7
5.2.3 Mechanical running and performance test .7
6 Cleanliness . 7
7 Marking . . 8
8 Guidance on installation design . 8
8.1 Pumps for cryogenic service .8
8.2 Additional guidance on installation design for pumps for oxygen service .9
Bibliography .10

iii
ISO 24490:2025(en)
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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 www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 220, Cryogenic vessels, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 268, Cryogenic vessels, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 24490:2016), which has been technically
revised.
The main changes are as follows:
— Title and Scope have been modified to only include centrifugal pumps;
— descriptions in 4.1 have been updated;
— description in 4.3.9 have been updated.
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.

iv
International Standard ISO 24490:2025(en)
Cryogenic vessels — Centrifugal pumps for cryogenic service
1 Scope
This document specifies the minimum requirements for the design, manufacture and testing of centrifugal
pumps for cryogenic service.
This document does not apply to reciprocating pumps.
This document also gives guidance on the design of installations.
It does not specify requirements for operation or maintenance.
NOTE For general requirements for materials used in cryogenic fluid service, see ISO 21029-1, ISO 20421-1 or
ISO 21009-1.
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 21010, Cryogenic vessels — Gas/material compatibility
ISO 21028-1, Cryogenic vessels — Toughness requirements for materials at cryogenic temperature — Part 1:
Temperatures below –80 °C
ISO 21028-2, Cryogenic vessels — Toughness requirements for materials at cryogenic temperature — Part 2:
Temperatures between ‒80 degrees C and ‒20 degrees C
ISO 23208, Cryogenic vessels — Cleanliness for cryogenic service
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
nominal pressure
PN
alphanumeric designation used for reference purposes related to a combination of mechanical and
dimensional characteristics of a component of a pipework system
Note 1 to entry: It comprises the letters PN followed by a dimensionless number equal to at least the maximum
1)
allowable pressure in bar.
Note 2 to entry: For a pump, PN can be different for inlet and outlet.
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .

ISO 24490:2025(en)
Note 3 to entry: For Europe, PN equals the design pressure (PS) as defined in the Pressure Equipment Directive
(2014/68/EU).
3.2
specified minimum temperature
lowest temperature for which the pump is specified
3.3
duty point
performance point defined by pressure or head and volume or mass flow rate
3.4
net positive suction head
NPSH
inlet total head increased by the head (in flowing liquid) corresponding to the atmospheric pressure at the
test location and decreased by the sum of the head corresponding to the vapour pressure of the pump liquid
at the inlet temperature and the inlet impeller height
Note 1 to entry: See also ISO 5198:1987, Table 1.
4 Requirements for pumps
4.1 General
Cryogenic centrifugal pumps shall conform with appropriate general standards. The appropriate general
standards shall be subject to the particular circumstances and should be agreed between the manufacturer
and the purchaser.
NOTE Commonly used standards are, for example, ISO 5199, ISO 13709 (ANSI/API 610) or EN 809.
In the event of conflict, the requirements of this document shall take precedence over the general standards.
4.2 Materials
4.2.1 General
Materials of construction shall be selected taking into consideration that cryogenic pumps operate at low
temperature, often in a damp environment, and at times with liquid oxygen or flammable fluids.
The minimum requirements given in 4.2.2, 4.2.3 and 4.2.4 shall apply.
4.2.2 Mechanical properties at low temperature
Metallic materials which are under stress at low temperature and which exhibit a ductile/brittle transition
(such as ferritic steels) shall have minimum toughness values in accor
...