SIST EN ISO 24664:2025
(Main)Refrigerating systems and heat pumps - Pressure relief devices and their associated piping - Methods for calculation (ISO 24664:2024)
Refrigerating systems and heat pumps - Pressure relief devices and their associated piping - Methods for calculation (ISO 24664:2024)
1.1 This Standard describes the calculation of mass flow for sizing pressure relief devices for components of refrigerating systems.
NOTE The term "refrigerating system" used in this Standard includes heat pumps.
1.2 This Standard describes the calculation of discharge capacities for pressure relief valves and other pressure relief devices in refrigerating systems including the necessary data for sizing these when relieving to atmosphere or to components within the system at lower pressure.
1.3 This Standard specifies the requirements for selection of pressure relief devices to prevent excessive pressure due to internal and external heat sources, the sources of increasing pressure (e.g. compressor, heaters, etc.) and thermal expansion of trapped liquid.
1.4 This Standard describes the calculation of the pressure loss in the upstream and downstream line of pressure relief valves and other pressure relief devices and includes the necessary data.
1.5 This Standard refers to other relevant standards in Clause 5.
Kälteanlagen und Wärmepumpen - Druckentlastungseinrichtungen und zugehörige Leitungen - Berechnungsverfahren (ISO 24664:2024)
1.1 Diese Internationale Norm beschreibt die Berechnung der Massenströme zur Größenbestimmung von Druckentlastungseinrichtungen für Teile von Kälteanlagen.
ANMERKUNG Der in dieser Europäischen Norm verwendete Begriff "Kälteanlage" schließt Wärmepumpen mit ein.
1.2 Diese Internationale Norm beschreibt die Berechnung der Abblaseleistungen von Druckentlastungsventilen und anderen Druckentlastungseinrichtungen in Kälteanlagen einschließlich der hierzu erforderlichen Daten zur Größenbestimmung dieser Einrichtungen, wenn sie ins Freie oder in einen Teil der Kälteanlage mit niedrigerem Druck abblasen.
1.3 Diese Internationale Norm legt die Anforderungen an die Auswahl von Druckentlastungseinrichtungen zur Vermeidung von unzulässigen Drücken, hervorgerufen durch innere und äußere Wärmequellen, Druckerzeuger (z. B. Verdichter, Erhitzer usw.) und die Wärmeausdehnung eingesperrter Flüssigkeit fest.
1.4 Diese Internationale Norm beschreibt die Berechnung des Druckabfalls in den zu und abführenden Leitungen von Druckentlastungsventilen und anderen Druckentlastungseinrichtungen einschließlich der erforderlichen Daten.
Systèmes frigorifiques et pompes à chaleur - Dispositifs de limitation de pression et tuyauteries associées - Méthodes de calcul (ISO 24664:2024)
Le présent document décrit le calcul:
— du débit massique pour le dimensionnement des dispositifs de limitation de pression pour les composants des systèmes de réfrigération;
— des capacités de décharge des soupapes de sécurité et autres dispositifs de limitation de pression des systèmes de réfrigération, y compris les données nécessaires à leur dimensionnement lors de leur décharge dans l'atmosphère ou dans les composants du système de réfrigération à plus basse pression;
— de la perte de charge dans la tubulure en amont et en aval des soupapes de sécurité et autres dispositifs de limitation de pression, et inclut les données nécessaires.
Le présent document spécifie les exigences relatives à la sélection des dispositifs de limitation de pression pour éviter une pression excessive due aux sources de chaleur internes et externes, aux sources de génération de pression (par exemple compresseurs, chauffages, etc.) et à la dilatation thermique du fluide piégé.
NOTE Le terme «système de réfrigération» utilisé dans le présent document inclut les pompes à chaleur.
Hladilni sistemi in toplotne črpalke - Tlačne varnostne naprave in njihove napeljave - Metode za izračun (ISO 24664:2024)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2025
Hladilni sistemi in toplotne črpalke - Tlačne varnostne naprave in njihove
napeljave - Metode za izračun (ISO 24664:2024)
Refrigerating systems and heat pumps - Pressure relief devices and their associated
piping - Methods for calculation (ISO 24664:2024)
Kälteanlagen und Wärmepumpen - Druckentlastungseinrichtungen und zugehörige
Leitungen - Berechnungsverfahren (ISO 24664:2024)
Systèmes frigorifiques et pompes à chaleur - Dispositifs de limitation de pression et
tuyauteries associées - Méthodes de calcul (ISO 24664:2024)
Ta slovenski standard je istoveten z: EN ISO 24664:2024
ICS:
27.080 Toplotne črpalke Heat pumps
27.200 Hladilna tehnologija Refrigerating technology
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 24664
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2024
EUROPÄISCHE NORM
ICS 27.080; 27.200 Supersedes EN 13136:2013+A1:2018
English Version
Refrigerating systems and heat pumps - Pressure relief
devices and their associated piping - Methods for
calculation (ISO 24664:2024)
Systèmes de réfrigération et pompes à chaleur - Kälteanlagen und Wärmepumpen -
Dispositifs de limitation de pression et tuyauteries Druckentlastungseinrichtungen und zugehörige
associées - Méthodes de calcul (ISO 24664:2024) Leitungen - Berechnungsverfahren (ISO 24664:2024)
This European Standard was approved by CEN on 17 September 2024.
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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 24664:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU (Pressure equipment Directive) aimed to be
covered. 4
European foreword
This document (EN ISO 24664:2024) has been prepared by Technical Committee ISO/TC 86
"Refrigeration and air-conditioning" in collaboration with Technical Committee CEN/TC 182
“Refrigerating systems, safety and environmental requirements” the secretariat of which is held by DIN.
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 June 2025, and conflicting national standards shall be
withdrawn at the latest by June 2025.
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 13136:2013+A1:2018.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
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 24664:2024 has been approved by CEN as EN ISO 24664:2024 without any modification.
Annex ZA
(informative)
Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU (Pressure equipment Directive)
aimed to be covered
This European Standard has been prepared under a Commission’s standardization request M/601 to
provide one voluntary means of conforming to essential requirements of Directive 2014/68/EU OF THE
EUROPEAN PARLIAMENT AND OF THE COUNCIL of 15 May 2014 on the harmonization of the laws of
the Member States relating to the making available on the market pressure equipment.
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 and application of the
edition of the normatively referenced standards as given in Table ZA.2 confers, within the limits of the
scope of this standard, a presumption of conformity with the corresponding essential requirements of
that Directive and associated EFTA regulations.
Table ZA.1 — Correspondence between this European Standard and Annex I of
Directive 2014/68/EU (Pressure equipment Directive)
Essential Requirements Clause(s)/subclause(s) of Remarks/Notes
of Directive 2014/68/EU this EN
2.10 Clause 6 Protection against exceeding the
allowable limits of pressure
equipment
2.12 Clause 6.2.1 External Fire
2.11.2 Clause 5
Clause 7 Pressure limiting devices
Clause 8
Table ZA.2 — Applicable Standards to confer presumption of conformity as described in this
Annex ZA
Reference in European Standard Title Corresponding European
Clause 2 Edition Standard Edition
ISO 4126-1:2013 ISO 4126-1:2013 Safety devices for EN ISO 4126-1:2013
/Amd 1:2016 protection against
ISO 4126-1:2013/Amd EN ISO 4126-
excessive pressure —
1:2016 1:2013/A1:2016
Part 1: Safety valves
ISO 4126-2:2018 ISO 4126-2:2018 Safety devices for EN ISO 4126-2:2019
protection against
excessive pressure —
Part 2: Bursting disc
safety devices
ISO 21922:2021 ISO 21922:2021 Refrigerating systems EN ISO 21922:2021
and heat pumps —
Valves —
Requirements, testing
and marking
The documents listed in the Column 1 of Table ZA.2, in whole or in part, are normatively referenced in
this document, i.e. are indispensable for its application. The achievement of the presumption of
conformity is subject to the application of the edition of standards as listed in Column 4 or, if no
European Standard Edition exists, the European Standard Edition given in Column 2 of Table ZA.2.
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
International
Standard
ISO 24664
First edition
Refrigerating systems and heat
2024-11
pumps — Pressure relief devices
and their associated piping —
Methods for calculation
Systèmes de réfrigération et pompes à chaleur — Dispositifs de
limitation de pression et tuyauteries associées — Méthodes de calcul
Reference number
ISO 24664:2024(en) © ISO 2024
ISO 24664:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
ISO 24664:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 General . 4
6 Minimum required discharge capacity for protection of parts of a refrigerating system . 5
6.1 General .5
6.2 Excessive pressure caused by heat sources.6
6.2.1 External heat sources .6
6.2.2 Internal heat sources .7
6.3 Excessive pressure caused by compressors .7
6.4 Excessive pressure caused by expansion of trapped liquid .7
7 Discharge capacity of pressure relief devices . 8
7.1 General .8
7.2 Discharge capacity of pressure relief valves .8
7.3 Discharge capacity of bursting discs .9
8 Pressure loss in inlet and outlet lines . 10
8.1 General .10
8.2 Pressure loss in inlet line .10
8.3 Pressure loss in outlet line .11
8.4 Total pressure loss .
...
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