EN ISO 14903:2025
(Main)Refrigerating systems and heat pumps - Qualification of tightness of components and joints (ISO 14903:2025)
Refrigerating systems and heat pumps - Qualification of tightness of components and joints (ISO 14903:2025)
This document specifies the qualification procedure for type approval of the tightness of hermetically sealed and closed components, joints and parts used in refrigerating systems and heat pumps as described in relevant parts of the ISO 5149 series, including metal flexible piping. It specifies the level of tightness of the component as a whole and its assembly as specified by the manufacturer. It specifies additional requirements for mechanical joints that can be recognized as hermetically sealed joints.
This document is applicable to joints of maximum DN 50 and components of internal volume of maximum 5 l and maximum weight of 50 kg.
It is applicable to the hermetically sealed and closed components, joints and parts (e.g. fittings, bursting discs, flanged or fitted assemblies) used in the refrigerating installations, including those with seals, whatever their material and design are.
This document does not apply to the tightness of flexible piping made from non-metallic material. This is covered in ISO 13971.
Components tested before the date of publication of this document and found to comply with ISO 14903:2017 are considered to comply with this document.
Kälteanlagen und Wärmepumpen - Qualifizierung der Dichtheit der Bauteile und Verbindungen (ISO 14903:2025)
Dieses Dokument legt ein Verfahren zur Verfügung zur Qualifizierung der Baumusterprüfung zur Dichtheit von hermetisch dichten und geschlossenen Bauteilen, Verbindungen und Teilen, die in Kälteanlagen und Wärmepumpen, wie in relevanten Teilen der Normenreihe ISO 5149 beschrieben, Anwendung finden, einschließlich der metallischen, flexiblen Rohrleitungen. Es legt den Grad der Dichtheit des Bauteils als Ganzes sowie dessen durch den Hersteller festgelegten Zusammenbau fest. Es legt zusätzliche Anforderungen an mechanische Verbindungen fest, die als hermetisch dichte Verbindungen anerkannt werden können.
Dieses Dokument ist anwendbar für Verbindungen mit höchstens DN 50 und für Bauteile mit einem Innenvolumen von höchstens 5 l und einer Höchstmasse von 50 kg.
Es ist auf die in kältetechnischen Einrichtungen angewendeten hermetisch dichten und geschlossenen Bauteile, Verbindungen und Teile (z. B. Fittings, Berstscheiben, geflanschte oder verbundene Baugruppen) anwendbar, einschließlich der mit Dichtungen versehenen, unabhängig von deren Werkstoff und Auslegung.
Dieses Dokument gilt nicht für die Dichtheit flexibler Rohrleitungen aus nicht-metallischem Material. Dies wird in ISO 13971 behandelt.
Bauteile, die vor dem Veröffentlichungsdatum dieses Dokuments geprüft wurden und ISO 14903:2017 entsprechen, werden als übereinstimmend mit diesem Dokument betrachtet.
Systèmes de réfrigération et pompes à chaleur - Qualification de l'étanchéité des composants et des joints (ISO 14903:2025)
Le présent document spécifie les procédures de qualification pour essai de type de l’étanchéité des composants, joints et éléments hermétiquement scellés et fermés, utilisés dans les systèmes de réfrigération et les pompes à chaleur comme décrits dans les parties pertinentes de la série ISO 5149, y compris les flexibles métalliques. Il spécifie le niveau d’étanchéité du composant dans son ensemble et de son assemblage comme spécifié par le fabricant. Il spécifie des exigences supplémentaires concernant les joints mécaniques susceptibles d’être considérés comme des joints hermétiquement scellés.
Le présent document s’applique aux joints de DN 50 maximum et aux composants d'un volume interne de 5 l maximum et d’un poids de 50 kg maximum.
Il est applicable aux composants, joints et éléments hermétiquement scellés et fermés (par exemple, raccords, disques de rupture ou d’éclatement, assemblages à brides ou à raccords) utilisés dans les installations de réfrigération, y compris ceux avec joints d’étanchéité, indépendamment de leur matière et de leur conception.
Le présent document ne s’applique pas à l’étanchéité des flexibles en matériaux non métalliques. Ils sont traités dans l’ISO 13971.
Les composants soumis à essai avant la date de publication du présent document et jugés conformes à l'ISO 14903:2017 sont considérés comme conformes au présent document.
Hladilni sistemi in toplotne črpalke - Ocena tesnosti sestavnih delov in spojev (ISO 14903:2025)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2025
Hladilni sistemi in toplotne črpalke - Ocena tesnosti sestavnih delov in spojev (ISO
14903:2025)
Refrigerating systems and heat pumps - Qualification of tightness of components and
joints (ISO 14903:2025)
Kälteanlagen und Wärmepumpen - Qualifizierung der Dichtheit der Bauteile und
Verbindungen (ISO 14903:2025)
Systèmes de réfrigération et pompes à chaleur - Qualification de l'étanchéité des
composants et des joints (ISO 14903:2025)
Ta slovenski standard je istoveten z: EN ISO 14903:2025
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 14903
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2025
EUROPÄISCHE NORM
ICS 27.080; 27.200 Supersedes EN ISO 14903:2017
English Version
Refrigerating systems and heat pumps - Qualification of
tightness of components and joints (ISO 14903:2025)
Systèmes de réfrigération et pompes à chaleur - Kälteanlagen und Wärmepumpen - Qualifizierung der
Qualification de l'étanchéité des composants et des Dichtheit der Bauteile und Verbindungen (ISO
joints (ISO 14903:2025) 14903:2025)
This European Standard was approved by CEN on 10 January 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 14903:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 14903:2025) 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 July 2025, and conflicting national standards shall be
withdrawn at the latest by July 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 ISO 14903:2017.
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 14903:2025 has been approved by CEN as EN ISO 14903:2025 without any modification.
International
Standard
ISO 14903
Third edition
Refrigerating systems and heat
2025-01
pumps — Qualification of tightness
of components and joints
Systèmes de réfrigération et pompes à chaleur — Qualification de
l'étanchéité des composants et des joints
Reference number
ISO 14903:2025(en) © ISO 2025
ISO 14903:2025(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
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Published in Switzerland
ii
ISO 14903:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Test requirements . 3
6 Requirements for sealed systems . . 7
7 Test procedures . 7
7.1 General .7
7.2 Sampling .7
7.3 Test temperature .7
7.4 Tightness test .8
7.4.1 General .8
7.4.2 Tightness level control .9
7.5 Requirements for joints .10
7.5.1 Test samples .10
7.5.2 Torque .10
7.5.3 Reusable joint .11
7.5.4 Requirements for hermetically sealed joints .11
7.6 Pressure-temperature vibration tests (PTV) .11
7.6.1 General .11
7.6.2 Samples .11
7.6.3 Test equipment and arrangements .11
7.6.4 Method: Combined pressure-temperature cycle test with a separate vibration
test. 12
7.7 Operation simulation .17
7.8 Freezing test .17
7.9 Additional pressure test for hermetically sealed joints .18
7.10 Vacuum test .19
7.11 Compatibility screening test .19
7.11.1 General .19
7.11.2 Test fluids . . .19
7.11.3 Test specimens .19
7.11.4 Test setup parameters . 20
7.11.5 Test procedure. 20
7.11.6 Pass/fail criteria for sealing elements .21
7.12 Fatigue test for hermetically sealed joints .21
8 Test report .22
9 Information to the user .22
Annex A (informative) Equivalent tightness control levels .23
Bibliography .29
...
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