Refrigerating systems and heat pumps - Flexible pipe elements, vibration isolators, expansion joints and non-metallic tubes - Requirements, design and installation

This document 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 of non-metallic tubes (e.g. plastic) used in evaporating and/or condensing sides of refrigerating systems and heat pumps.
It does not apply to flexible pipes that are only occasionally stressed beyond the elastic limit, e. g. during repair work, or to joints which are free to rotate or hinge.

Kälteanlagen und Wärmepumpen - Flexible Rohrleitungsteile, Schwingungsabsorber, Kompensatoren und Nichtmetall-Schläuche - Anforderungen, Konstruktion und Einbau

Dieses Dokument gilt für flexible Rohrleitungsteile (z. B. biegsames Metall-Rohr, Metall-Schlauch,
Schwingungsabsorber, Kompensator) und für Nichtmetall-Schläuche in Kältemittelkreisläufen von Kälteanlagen
und Wärmepumpen.
Es legt auch Anforderungen zur Bestimmung der Dichtigkeit von Nichtmetall-Schläuchen (z. B. Kunststoff)
fest, die in Verdunstungs- und/oder kondensierenden Seiten von Kälteanlagen und Wärmepumpen angewendet
werden.
Es gilt nicht für biegsame Rohre, die nur gelegentlich über ihre Elastizitätsgrenze hinaus beansprucht werden,
z. B. bei Reparaturen, oder für drehbar gelagerte Verbindungen oder Rohrgelenke.

Systèmes de réfrigération et pompes à chaleur - Eléments flexibles de tuyauterie, isolateurs de vibration, joints de dilatation et tubes non métalliques - Exigences, conception et installation

Le présent document 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 les 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 des tubes non métalliques (par exemple en
plastique) utilisés côté condenseurs et/ou évaporateurs des systèmes de réfrigération et pompes à chaleur.
Elle ne s’applique pas 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, ou aux joints qui tournent ou
pivotent librement.

Hladilni sistemi in toplotne črpalke - Gibki cevni elementi, blažilniki vibracij, raztezni spoji in nekovinske cevi - Zahteve, načrtovanje in vgradnja

General Information

Status
Published
Publication Date
11-Nov-2008
Current Stage
9060 - Closure of 2 Year Review Enquiry - Review Enquiry
Due Date
04-Jun-2018
Completion Date
04-Jun-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.QMDKälteanlagen und Wärmepumpen - Flexible Rohrleitungsteile, Schwingungsabsorber, Kompensatoren und Nichtmetall-Schläuche - Anforderungen, Konstruktion und EinbauSystèmes de réfrigération et pompes à chaleur - Eléments flexibles de tuyauterie, isolateurs de vibration, joints de dilatation et tubes non métalliques - Exigences, conception et installationRefrigerating systems and heat pumps - Flexible pipe elements, vibration isolators, expansion joints and non-metallic tubes - Requirements, design and installation27.200Hladilna tehnologijaRefrigerating technology27.080Heat pumpsICS:Ta slovenski standard je istoveten z:EN 1736:2008SIST EN 1736:2009en,fr,de01-januar-2009SIST EN 1736:2009SLOVENSKI

STANDARDSIST EN 1736:20001DGRPHãþD
SIST EN 1736:2009

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1736November 2008ICS 27.080; 27.200Supersedes EN 1736:2000

English VersionRefrigerating systems and heat pumps - Flexible pipe elements,vibration isolators, expansion joints and non-metallic tubes -Requirements, design and installationSystèmes de réfrigération et pompes à chaleur - Elémentsflexibles de tuyauterie, isolateurs de vibration, joints dedilatation et tubes non métalliques - Exigences, conceptionet installationKälteanlagen und Wärmepumpen - FlexibleRohrleitungsteile, Schwingungsabsorber, Kompensatorenund Nichtmetall-Schläuche - Anforderungen, Konstruktionund EinbauThis European Standard was approved by CEN on 5 October 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1736:2008: ESIST EN 1736:2009

EN 1736:2008 (E) 2 Contents Page Foreword..............................................................................................................................................................3 Introduction.........................................................................................................................................................4 1 Scope......................................................................................................................................................5 2 Normative references............................................................................................................................5 3 Terms and definitions...........................................................................................................................5 4 Applications...........................................................................................................................................7 5 Materials...............................................................................................................................................10 6 Pressure and pulsation requirements...............................................................................................10 7 Permeability of non-metallic flexible tubes.......................................................................................11 8 Internal cleaness, internal humidity and permeability of water vapour.........................................13 9 End connections..................................................................................................................................13 10 Pre-charged flexible pipe elements...................................................................................................13 11 Marking.................................................................................................................................................13 12 Documentation.....................................................................................................................................14

SIST EN 1736:2009

EN 1736:2008 (E) 3 Foreword This document (EN 1736:2008) has been prepared by 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 May 2009, and conflicting national standards shall be withdrawn at the latest by May 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1736:2000. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 1736:2009

EN 1736:2008 (E) 4 Introduction The use of flexible pipe elements is required where impermissible stresses are to be eliminated from refrigerating circuits and pipe expansion or relative movements of components are to be absorbed. The use of flexible pipe elements should not be specified unless it is necessary in the design of refrigerant circuits. If necessary, they should be designed and installed in accordance with this standard. 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. SIST EN 1736:2009

EN 1736:2008 (E) 5 1 Scope This document 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 of non-metallic tubes (e.g. plastic) used in evaporating and/or condensing sides of refrigerating systems and heat pumps. It does not apply to flexible pipes that are only occasionally stressed beyond the elastic limit, e. g. during repair work, or to joints which 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. EN 378-1:2008, Refrigerating systems and heat pumps — Safety and environmental requirements — Part 1: Basic requirements, definitions, classification and selection criteria EN 378-2:2008, Refrigerating systems and heat pumps — Safety and environmental requirements — Part 2: Design, construction, testing, marking and documentation EN ISO 175, Plastics - Methods of test for the determination of the effects of immersion in liquid chemicals (ISO 175:1999) ISO 6605:2002, Hydraulic fluid power — Hoses and hose assemblies — Test methods 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 378-1:2008 and the following apply. 3.1 flexible pipe element any form of pipe or tube connecting two points which may move relative to each other NOTE 1 This generic term includes all types, as defined in 3.2 to 3.6. NOTE 2 Flexible pipe elements may include a plastic barrier in the construction, either as a liner on the inner surface or as a sandwich in the pipe wall. The main purpose of such a barrier is to reduce the permeation of refrigerant gas. 3.2 metallic flexible pipe

readily flexible, small bore pipe, e. g. capillary tube which is capable of movement within its elastic limit during operation of the refrigerating system (see Figure 1) NOTE This type of pipe is flexible by virtue of the shape into which the tube is bent, e. g. coiled capillary tube. 3.3 metallic flexible tube tubular flexible element designed to bend within defined limits and containing a corrugated metal bellows, the corrugations of which may be annular or spiral (see Figure 1) SIST EN 1736:2009

EN 1736:2008 (E) 6 NOTE 1 Metallic flexible tubes may be reinforced by metallic braiding which may be covered by rubber or plastic but the whole element should be designed so that, when bent within pre-determined limits, it is not stressed beyond the elastic limit. NOTE 2 This type of pipe is flexible by virtue of its design and construction, e. g. bellows. 3.4 non-metallic flexible tube tubular flexible element designed to bend within defined limits (see Figure 1) NOTE 1 Non-metallic flexible tubes may have smooth bore or corrugated bore and they may be reinforced to withstand pressure, vacuum or external impact. NOTE 2 This type of pipe is flexible by virtue of its material, e. g. elastomer. NOTE 3 For non-metallic flexible tube are to be intended all the pipes made of plastic or rubber: mono-layer, multi-layer, reinforced and non-reinforced ones. SIST EN 1736:2009

EN 1736:2008 (E) 7
Flexible Pipe Elements

metallic flexibe pipe (3.2) metallic flexible tube (3.3) non-metallic flexible tube (3.4)

flexibility is configuration dependent (e. g. coils) flexibility is construction dependent (e. g. bellows) flexibility is material dependent (e. g. elastomer) Figure 1 — Types of flexible pipe elements 3.5 expansion joint tubular pipe element shaped in such a way that it provides limited movement to accommodate thermal expansion without reaching its elastic limit 3.6 vibration isolator short flexible tube usually of metallic construction which is intended to reduce the effects of vibration from the compressor to other parts of the refrigerating system or vice versa 3.7 maximum allowable pressure PS maximum pressure for which the equipment is designed, as specified by the manufacturer 3.8 maximum/minimum allowable temperature TS maximum/minimum temperature for which the equipment is designed, as specified by the manufacturer 4 Applications 4.1 General 4.1.1 The refrigerating system shall be so designed and constructed that the components being connected by the flexible pipe elements and non-metallic tubes cannot move in such a way as to stress the pipe element beyond its elastic limit. 4.1.2 Flexible pipe elements and non-metallic tubes shall be installed in accordance with the manufacturer's instructions. 4.1.3 Flexible pipe elements, vibration isolators, expansion joints and non-metallic tubes shall be used only if necessary. SIST EN 1736:2009

EN 1736:2008 (E) 8 4.2 Significantly moved flexible pipe elements NOTE Such elements are subjected to regular movement through significant distance to allow the operation of refrigerating equipment such as plate freezers. 4.2.1 Significantly moved flexible pipe elements shall be supported and connected in such a way that they are not bent to radii less than those specified by the manufacturer. 4.2.2 Significantly moved flexible pipe elements shall not allow the generation of static electricity when non-conducting refrigerants pass through them at high velocity. NOTE This may be achieved by the use of antistatic plastic as lining. 4.2.3 Significantly moved flexible pipe elements shall be so installed that there is no danger of the outer covering being abraded on stationary objects during movement of the flexible pipe. 4.2.4 Significantly moved flexible pipe elements shall be so constructed and connected that they are not liable to damage by the freezing of water or by corrosion by humidity at the surface or at joints. 4.2.5 The manufacturer of significantly moved non-metallic flexible tubes shall specify the permeability of the pipe element to water vapour and to the refrigerants for which it is suitable (see Clauses 7 and 8). 4.3 Intermittently moved flexible pipe elements NOTE Such elements move intermittently to take up relative movement between components of the refrigerating system. 4.3.1 Intermittently moved flexible pipe elements shall be supported and connected in such a way that they are not bent to radii less than those specified by the manufacturer. 4.3.2 Intermittently moved flexible pipe elements sh

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