1、February 2009DEUTSCHE NORM English price group 10No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 27.080; 27.200!$Upt“1
2、507781www.din.deDDIN EN 1736Refrigerating systems and heat pumps Flexible pipe elements, vibration isolators, expansion joints andnon-metallic tubes Requirements, design and installationEnglish version of DIN EN 1736:2009-02Klteanlagen und Wrmepumpen Flexible Rohrleitungsteile, Schwingungsabsorber,
3、Kompensatoren undNichtmetall-Schluche Anforderungen, Konstruktion und EinbauEnglische Fassung DIN EN 1736:2009-02SupersedesDIN EN 1736:2000-04www.beuth.deDocument comprises 16 pagesDIN EN 1736:2009-02 2 National foreword This standard has been prepared by Technical Committee CEN/TC 182 “Refrigeratin
4、g systems, safety and environmental requirements” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Kltetechnik (Refrigeration Technology Standards Committee), Technical Committee NA 044-00-01 AA Sicherheit und Umweltschutz. Amendments This
5、standard differs from DIN EN 1736:2000-04 as follows: a) Clause 3 “Terms and definitions” has been revised. b) Clause 7 “Permeability of non-metallic flexible tubes” has been revised. c) Clause 11 “Marking” has been revised. Previous editions DIN 8975-9: 1983-10 DIN EN 1736: 2000-04 EUROPEAN STANDAR
6、DNORME EUROPENNEEUROPISCHE NORMEN 1736November 2008ICS 27.080; 27.200 Supersedes EN 1736:2000 English VersionRefrigerating systems and heat pumps - Flexible pipe elements,vibration isolators, expansion joints and non-metallic tubes -Requirements, design and installationSystmes de rfrigration et pomp
7、es chaleur - Elmentsflexibles de tuyauterie, isolateurs de vibration, joints dedilatation et tubes non mtalliques - Exigences, conceptionet installationKlteanlagen und Wrmepumpen - FlexibleRohrleitungsteile, Schwingungsabsorber, Kompensatorenund Nichtmetall-Schluche - Anforderungen, Konstruktionund
8、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
9、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 membe
10、r 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, Latv
11、ia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels
12、2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1736:2008: EEN 1736:2008 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 Applications .7 5 Materials .10 6 Pressure an
13、d pulsation requirements .10 7 Permeability of non-metallic flexible tubes.11 8 Internal cleaness, internal humidity and permeability of water vapour.13 9 End connections13 10 Pre-charged flexible pipe elements .13 11 Marking .13 12 Documentation.14 DIN EN 1736:2009-02 EN 1736:2008 (E) 3 Foreword Th
14、is 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
15、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 id
16、entifying 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, Denmar
17、k, 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. DIN EN 1736:2009-02 EN 1736:2008 (E) 4 Introduction The use of
18、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 ci
19、rcuits. 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. DIN EN 1736:2009-02 EN 1736:2008 (E) 5 1 Scope This
20、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 require
21、ments 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
22、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. E
23、N 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, mar
24、king 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 defi
25、nitions 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
26、 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 e
27、lastic 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 cor
28、rugated metal bellows, the corrugations of which may be annular or spiral (see Figure 1) DIN EN 1736:2009-02 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
29、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 f
30、lexible 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 o
31、r rubber: mono-layer, multi-layer, reinforced and non-reinforced ones. DIN EN 1736:2009-02 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 construct
32、ion 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
33、 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
34、 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 flexi
35、ble 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 manufacturers instructions. 4.1.3 Flexible pipe elements, vibration isolators, expa
36、nsion joints and non-metallic tubes shall be used only if necessary. DIN EN 1736:2009-02 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
37、 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-con
38、ducting 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 t
39、he 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 shal
40、l 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
41、.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 shall not allow the generation of static electricity when non-conducting re
42、frigerants pass through them at high velocity. NOTE This may be achieved by the use of antistatic plastic as lining. 4.3.3 Intermittently 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 flexib
43、le pipe. 4.3.4 Intermittently 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. 4.3.5 The manufacturer of intermittently moved non-metallic flexible tubes shall speci
44、fy the permeability of the pipe element to water vapour and to the refrigerants for which it is suitable (see Clauses 7 and 8). 4.4 Fixed installed flexible pipe elements NOTE Such elements are used to minimise assembly difficulty by accommodating slight misalignments or relative movement between co
45、mponents of the refrigerating system. 4.4.1 Fixed installed 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. 4.4.2 Fixed installed flexible pipe elements shall not allow the generation of static elect
46、ricity when non-conducting refrigerants pass through them at high velocity. NOTE This may be achieved by the use of antistatic plastic as lining. DIN EN 1736:2009-02 EN 1736:2008 (E) 9 4.4.3 Fixed installed flexible pipe elements shall be so constructed and connected that they will not be damaged by
47、 freezing of water or by corrosion by humidity at the surface or at joints. 4.4.4 The manufacturer of fixed installed 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). 4.5 Vibration i
48、solators NOTE 1 Vibration isolators are commonly used as suction and discharge connections for compressors and are also sometimes used as connections to evaporators and condensers. NOTE 2 Vibration isolators are not suitable for preventing the transmission of gas pulsation. 4.5.1 Vibration isolators
49、 shall be so installed that they are not subjected to combined bending and twisting. 4.5.2 Vibration isolators shall be so installed that they can accommodate not only the vibration emanating from a running compressor but also the movement of a spring mounted compressor at starting and stopping. 4.5.3 Where the vibration to be isolated has components in more than one plane, care shall be taken to ensure that the axis of the vibration isolator enables all these components to be accommodated. If necessary, two vibration isolators connected at rig
