SIST EN ISO 24490:2026
(Main)Cryogenic vessels - Centrifugal pumps for cryogenic service (ISO 24490:2025)
Cryogenic vessels - Centrifugal pumps for cryogenic service (ISO 24490:2025)
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.
Kryo‑Behälter - Pumpen für den Kryo‑Betrieb (ISO 24490:2025)
Dieses Dokument legt die Mindestanforderungen an die Auslegung, Fertigung und Prüfung von Kreiselpumpen für den Kryo-Betrieb fest.
Dieses Dokument ist nicht anwendbar für Kolbenpumpen.
Dieses Dokument gibt auch eine Anleitung zur Auslegung von Anlagen.
Es legt keine Anforderungen an Betrieb oder Instandhaltung fest.
ANMERKUNG Zu allgemeinen Anforderungen für Werkstoffe, die im Betrieb mit tiefkalten Fluiden eingesetzt werden, siehe ISO 21029 1, ISO 20421 1 oder ISO 21009 1.
Récipients cryogéniques - Pompes centrifuges pour service cryogénique (ISO 24490:2025)
Le présent document spécifie les exigences minimales en matière de conception, de fabrication et d’essais des pompes centrifuges pour service cryogénique.
Le présent document ne s’applique pas aux pompes à piston.
Le présent document donne également des recommandations relatives à la conception des installations.
Il ne spécifie aucune exigence relative au fonctionnement ou à la maintenance.
NOTE Pour connaître les exigences générales relatives aux matériaux utilisés dans le cadre du service des fluides cryogéniques, voir l’ISO 21029-1, l’ISO 20421-1 ou l’ISO 21009-1.
Kriogene posode - Centrifugalne črpalke za kriogeno območje (ISO 24490:2025)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN ISO 24490:2024
01-julij-2024
Kriogene posode - Centrifugalne črpalke za kriogeno območje (ISO/DIS
24490:2024)
Cryogenic vessels - Centrifugal pumps for cryogenic service (ISO/DIS 24490:2024)
Kryo‑Behälter - Pumpen für den Kryo-Betrieb (ISO/DIS 24490:2024)
Récipients cryogéniques - Pompes centrifuges pour service cryogénique (ISO/DIS
24490:2024)
Ta slovenski standard je istoveten z: prEN ISO 24490
ICS:
23.020.40 Proti mrazu odporne posode Cryogenic vessels
(kriogenske posode)
23.080 Črpalke Pumps
oSIST prEN ISO 24490:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN ISO 24490:2024
oSIST prEN ISO 24490:2024
DRAFT
International
Standard
ISO/DIS 24490
ISO/TC 220
Cryogenic vessels — Centrifugal
Secretariat: AFNOR
pumps for cryogenic service
Voting begins on:
Récipients cryogéniques — Pompes centrifuges pour service
2024-06-03
cryogénique
Voting terminates on:
ICS: 23.020.40 2024-08-26
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 24490:2024(en)
oSIST prEN ISO 24490:2024
DRAFT
ISO/DIS 24490:2024(en)
International
Standard
ISO/DIS 24490
ISO/TC 220
Cryogenic vessels — Centrifugal
Secretariat: AFNOR
pumps for cryogenic service
Voting begins on:
Récipients cryogéniques — Pompes centrifuges pour service
cryogénique
Voting terminates on:
ICS: 23.020.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
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NOTIFICATION OF ANY RELEVANT PATENT
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Published in Switzerland Reference number
ISO/DIS 24490:2024(en)
ii
oSIST prEN ISO 24490:2024
ISO/DIS 24490:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements for pumps . 2
4.1 Types .2
4.1.1 General .2
4.1.2 Horizontal Cryogenic Pump Systems .3
4.1.3 Vertical / Submerged Inert Cryogenic Pump Systems .3
4.1.4 Vertical / Submerged Liquid Oxygen Pump Systems .3
4.2 Materials .3
4.2.1 General .3
4.2.2 Mechanical properties at low temperature .3
4.2.3 Corrosion resistance .4
4.2.4 Oxygen and oxidizing fluids compatibility .4
4.2.5 Hydrogen compatibility .4
4.3 Design .5
4.3.1 Pressure-containing parts .5
4.3.2 Performance .5
4.3.3 Clearances .5
4.3.4 Prevention of rubbing .5
4.3.5 Fastenings .5
4.3.6 Warm bearings .5
4.3.7 Cold bearings .5
4.3.8 Bearing lubrication .5
4.3.9 Shaft seals .6
4.3.10 Purging .6
4.3.11 Prevention of particle contamination .7
4.3.12 Specific requirement for flammable cryogenic fluids .7
4.3.13 Protection against over-pressurization.7
4.3.14 Pump motors .7
5 Test procedures . 7
5.1 Prototype testing .7
5.1.1 General .7
5.1.2 Design evaluation .8
5.1.3 Performance evaluation . .8
5.1.4 Initial tests .8
5.1.5 Cryogenic tests .8
5.2 Production testing .9
5.2.1 General .9
5.2.2 Hydrostatic pressure test .9
5.2.3 Mechanical running and performance test .9
6 Cleanliness . 9
7 Marking . . 9
Annex A (informative) Guidance on installation design . 10
Annex B (informative) Acceptable materials for construction of centrifugal pumps for liquid
oxygen .12
Bibliography .16
iii
oSIST prEN ISO 24490:2024
ISO/DIS 24490:2024(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.
This third edition cancels and replaces the second edition (ISO 24490:2016), which has been technically
revised.
The main changes are as follows:
— Modified title and scope to only include centrifugal pumps;
— Updated descriptions in section 4.1;
— Updated description in Section 4.3.9;
— Updated Table B.1;
— Added Figure B.1 and B.2.
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
oSIST prEN ISO 24490:2024
DRAFT International Standard ISO/DIS 24490:2024(en)
Cryogenic vessels — Centrifugal pumps for cryogenic service
1 Scope
This International Standard specifies the minimum requirements for the design, manufacture and testing of
centrifugal pumps for cryogenic service.
This International Standard does not apply to reciprocating pumps.
This International Standard also gives guidance on the design of installations (see Annex A).
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 and/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 11114-1, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1: Metallic
materials
ISO 11114-2, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2: Non-
metallic materials
ISO 11114-4, Transportable gas cylinders
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/
oSIST prEN ISO 24490:2024
ISO/DIS 24490:2024(en)
3.1
nominal size
DN
alphanumeric designation of size for components of a pipework system, which is used for reference purposes
Note 1 to entry: It comprises the letters DN followed by a dimensionless whole number which is indirectly related to
the physical size, in millimetres, of the bore or outside diameter of the end connections.
Note 2 to entry: The number following the letters DN does not represent a measurable value and is not to be used for
calculation purposes except where specified in the relevant standard.
Note 3 to entry: In those standards which use the DN designation system, any relationship between DN and component
dimensions is given, e.g. DN/OD or DN/ID.
[SOURCE: ISO 6708:1995, 2.1, modified]
3.2
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
allowable pressure in bar.
Note 2 to entry: For a pump, PN can be different for inlet and outlet.
Note 3 to entry: For Europe, PN equals the design pressure (PS) as defined in the Pressure Equipment Directive
(2014/68/EU).
3.3
specified minimum temperature
lowest temperature for which the pump is specified
3.4
duty point
performance point defined by pressure or head and volume or mass flow rate
3.5
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 Types
4.1.1 General
Cryogenic centrifugal pumps shall comply with appropriate general standards. The appropriate general
standard(s) shall be subject to the particular circumstances and applicable regulations and should be agreed
between the manufacturer and the purchaser.
NOTE Commonly used standards are, e.g. ISO 5199, ISO 13709 (ANSI/API 610) or EN 809.
In the event of conflict, the requirements of this International Standard shall take precedence over the
general standards.
oSIST prEN ISO 24490:2024
ISO/DIS 24490:2024(en)
1)
4.1.2 Horizontal Cryogenic Pump Systems
Horizontal cryogenic pumps are used for liquid backup and transfer and truck loading as well as for
process applications. These pumps usually have one or two impellers or stages and can be installed in a
pump insulation enclosure or be non-insulated as necessary for continuous or noncontinuous (intermittent)
service. The degassing piping of a horizontal cryogenic pump may be connected to the discharge side.
Personnel may need to stand, at least temporarily, in close proximity for manual valve operation and to
supervise the cooldown and startup.
The cooldown time and procedure of a horizontal cryogenic pump system shall consider the size and the
mass of the cold end and the piping to cool down.
2)
4.1.3 Vertical / Submerged Inert Cryogenic Pump Systems
Vertical cryogenic pumps are typically used for cryogenic process and/or back-up applications where high
flow and pressure are required. These pumps have a more complicated process diagram and piping layout
as compared to horizontal pumps. These pumps can have one or several impellers or stages. The cold end of
these pumps may be installed in a stainless-steel barrel usually in insulated casing or in a container installed
at or below grade. The degassing piping of a vertical cryogenic pump system may be connected to the barrel
and routed back to the gaseous phase of the cryogen.
The cooldown time and procedure of a vertical cryogenic pump system shall consider the size and the mass
of the cold end and of the piping to cooldown. Cavitation can be more severe in multi-stage vertical cryogenic
pump systems during startup or in normal operation.
3)
4.1.4 Vertical / Submerged Liquid Oxygen Pump Systems
Cavitation can be more severe in multi-stage vertical liquid oxygen pump systems during startup or in
normal operation, which can lead to ignition of internal seals of the cold end with possible escalation to
combustion propagation up to burn through of the barrel and of the suction piping.
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 accordance with ISO 21028-1 or ISO 21028-2
as appropriate.
Metallic materials which can be shown to have no ductile/brittle transition do not require impact testing.
Non-metallic materials are generally used only for seals or heat barriers. If such materials are to be used
for structural parts, the stress levels and material impact values shall be shown to be acceptable for the
intended use.
1) This text is reproduced from CGA G-4.7, Stationary, Electric-Motor-Driven, Centrifugal Liquid Oxygen Pumps.
2) This text is reproduced from CGA G-4.7, Stationary, Electric-Motor-Driven, Centrifugal Liquid Oxygen Pumps.
3) This text is reproduced from CGA G-4.7, Stationary, Electric-Motor-Driven, Centrifugal Liquid Oxygen Pumps.
oSIST prEN ISO 24490:2024
ISO/DIS 24490:2024(en)
4.2.3 Corrosion resistance
Materials should be resistant to, or protected from, atmospheric corrosion. Where this is not achievable, a
suitable corrosion allowance shall be considered.
4.2.4 Oxygen and oxidizing fluids compatibility
If the specified minimum service temperature is equal to or less than the boiling point of air or the pump
is intended for oxygen service, the materials which are, or are likely to come, in contact with oxygen or
oxygen-enriched air shall be oxygen-compatible in accordance with ISO 21010.
If the pump is employed for oxidizing cryogenic fluids, e.g. nitrous oxide, the requirements for oxygen
compatibility should be taken into consideration.
In the case of nitrous oxide, the risk of decomposition shall also be considered.
Materials should be selected that minimize the potential for ignition and inhibit sustained combustion.
Suitable material properties are
— high ignition temperature,
— high thermal conductivity, and
— low heat of combustion.
Table B.1 lists materials found through testing and operating experience to be particularly suitable for
centrifugal cryogenic pumps in oxygen service. Materials other than those identified in Table B.1 may be
used but their selection shall be justified by specific testing or long-term experience in this application.
For (any) parts of the pump which are, or are likely to come, in contact with oxygen and which could be
exposed to energy sources such as friction, aluminium or aluminium alloy including aluminium bronzes
containing more than 2,5 % aluminium shall not be used. The use of aluminium or aluminium alloy for any
other parts shall only be adopted after careful consideration.
Stainless steel shall not be used for exposed thin components. Exceptions allowed are seal bellows, trapped
shims or gaskets and screw-locking devices of stationary parts where knowledge of past satisfactory
®4)
performance is available. However, suitable alternative materials, e.g. nickel or nickel alloy, Monel and
®4)
Inconel , should be considered.
NOTE Tin bronze has been found to be most suitable for the main “wetted” pump components. The most
commo
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