ISO 13971:2012

Refrigeration systems and heat pumps — Flexible pipe elements, vibration isolators, expansion joints and non-metallic tubes — Requirements and classification

ISO 13971:2012 describes requirements, design and installation of flexible pipe elements (e.g. metallic flexible pipe, metallic flexible tube, vibration isolator, expansion joint) and non-metallic tube used in the refrigerant circuits of refrigerating systems and heat pumps. ISO 13971:2012 also describes the requirements to qualify the tightness and permeability of non-metallic tubes (e.g. plastic) used in evaporating and/or condensing sides of refrigerating systems and heat pumps. ISO 13971:2012 does not apply to flexible pipes that are only occasionally stressed beyond the elastic limit (e.g. during repair work), or to joints that are free to rotate or hinge.

Systèmes de réfrigération et pompes à chaleur — Éléments flexibles de tuyauterie, isolateurs de vibration, joints de dilatation et tubes non métalliques — Exigences et classification

L'ISO 13971:2012 décrit les exigences, la conception et l'installation des éléments flexibles de tuyauterie (par exemple, tuyauterie flexible métallique, tuyaux flexibles métalliques, isolateurs de vibration, joints de dilatation) ainsi que des tubes non métalliques utilisés dans les circuits de fluides frigorigènes des systèmes de réfrigération et pompes à chaleur. Elle décrit également les exigences pour qualifier l'étanchéité et la perméabilité des tubes non métalliques (par exemple en plastique) utilisés côté condenseurs et/ou évaporateurs des systèmes de réfrigération et pompes à chaleur. Elle n'est pas applicable aux tuyauteries flexibles qui ne subissent qu'occasionnellement des contraintes au-delà de la limite d'élasticité, comme par exemple lors de travaux de réparation, ni aux joints qui tournent ou pivotent librement.

General Information

• Status: Published
• Publication Date: 27-Aug-2012
• ICS: 27.080 - Heat pumps
• ICS: 27.200 - Refrigerating technology
• Technical Committee: ISO/TC 86/SC 1 - Safety and environmental requirements for refrigerating systems
• Drafting Committee: ISO/TC 86/SC 1 - Safety and environmental requirements for refrigerating systems
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 08-Feb-2024

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 13971
First edition
2012-09-01
Refrigeration systems and heat pumps —
Flexible pipe elements, vibration
isolators, expansion joints and non-
metallic tubes — Requirements and
classification
Systèmes de réfrigération et pompes à chaleur — Éléments flexibles
de tuyauterie, isolateurs de vibration, joints de dilatation et tubes non
métalliques — Exigences et classification
Reference number
ISO 13971:2012(E)
©
ISO 2012

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ISO 13971:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

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ISO 13971:2012(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 13971 was prepared by Technical Committee ISO/TC 86, Refrigeration and air-conditioning, Subcommittee
SC 1, Safety and environmental requirements for refrigerating systems.
© ISO 2012 – All rights reserved iii

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ISO 13971:2012(E)
Introduction
Flexible pipe elements are used to eliminate impermissible stresses from refrigerating circuits and absorb pipe
expansion or relative movements of components.
Flexible pipe elements are often the weakest part of a refrigerating system and the part most likely to suffer
from fatigue or stress corrosion cracking.
iv © ISO 2012 – All rights reserved

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INTERNATIONAL STANDARD ISO 13971:2012(E)
Refrigeration systems and heat pumps — Flexible pipe
elements, vibration isolators, expansion joints and non-metallic
tubes — Requirements and classification
1 Scope
This International standard describes requirements, design and installation of flexible pipe elements (e.g.,
metallic flexible pipe, metallic flexible tube, vibration isolator, expansion joint) and non-metallic tube used in the
refrigerant circuits of refrigerating systems and heat pumps.
It also describes the requirements to qualify the tightness and permeability of non-metallic tubes (e.g., plastic)
used in evaporating and/or condensing sides of refrigerating systems and heat pumps.
This International standard does not apply to flexible pipes that are only occasionally stressed beyond the
elastic limit (e.g., during repair work), or to joints that are free to rotate or hinge.
2 Normative references
The following referenced documents are indispensable for the application 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 175, Plastics — Methods of test for the determination of the effects of immersion in liquid chemicals
ISO 5149-2, Refrigerating systems and heat pumps — Safety and environmental requirements — Part 2:
Design, construction, testing, marking and documentation
ISO 6605:2002, Hydraulic fluid power — Hoses and hose assemblies — Test methods
3  Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
expansion joint
tubular pipe element shaped in such a way that it provides limited movement to accommodate thermal expansion
without reaching its elastic limit
3.2
flexible pipe element
pipe or tube of non-permanent shape linking
...

NORME ISO
INTERNATIONALE 13971
Première édition
2012-09-01
Systèmes de réfrigération et pompes
à chaleur — Éléments flexibles de
tuyauterie, isolateurs de vibration, joints
de dilatation et tubes non métalliques —
Exigences et classification
Refrigeration systems and heat pumps — Flexible pipe elements,
vibrating isolators, expansion joints and non-metallic tubes —
Requirements and classification
Numéro de référence
ISO 13971:2012(F)
©
ISO 2012

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ISO 13971:2012(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2012
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée sous
quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l’accord écrit
de l’ISO à l’adresse ci-après ou du comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Publié en Suisse
ii © ISO 2012 – Tous droits réservés

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ISO 13971:2012(F)
Sommaire Page
Avant-propos .iv
Introduction . v
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Applications . 3
4.1 Généralités . 3
4.2 Éléments flexibles de tuyauterie pour mouvements significatifs, éléments flexibles
de tuyauterie pour mouvements intermittents et éléments flexibles de tuyauterie pour
installations fixes . 3
4.3 Isolateurs de vibration . 4
4.4 Joints de dilatation . 4
4.5 Tuyauteries flexibles métalliques . 5
5 Matériaux . 5
6 Exigences relatives à la pression, à la pulsation et la déformation . 5
7 Perméabilité des tubes flexibles non métalliques . 6
7.1 Généralités . 6
7.2 Mode opératoire d’essai . 6
8 Propreté interne, humidité interne et perméabilité à la vapeur d’eau . 7
9 Raccords d’extrémité . 8
10 Éléments flexibles de tuyauterie préchargés . 8
11 Marquage . 8
12 Documentation . 9
Bibliographie .10
© IS
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