1、March 2017 English price group 9No part of this translation 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 23.040.70!%bVa“2635162www.din.deDIN
2、 EN ISO 7233Rubber and plastics hoses and hose assemblies Determination of resistance to vacuum (ISO 7233:2016);English version EN ISO 7233:2016,English translation of DIN EN ISO 7233:2017-03Gummi und Kunststoffschluche und schlauchleitungen Bestimmung der Bestndigkeit gegen Vakuum (ISO 7233:2016);E
3、nglische Fassung EN ISO 7233:2016,Englische bersetzung von DIN EN ISO 7233:2017-03Tuyaux et flexibles en caoutchouc et en plastique Dtermination de la rsistance laspiration (ISO 7233:2016);Version anglaise EN ISO 7233:2016,Traduction anglaise de DIN EN ISO 7233:2017-03SupersedesDIN EN ISO 7233:20080
4、7www.beuth.deDocument comprises 13 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.03.17 DIN EN ISO 7233:2017-03 2 A comma is used as the decimal marker. National foreword This document (EN ISO 7233:2016) has been prepared by T
5、echnical Committee ISO/TC 45 “Rubber and rubber products” in collaboration with Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was DIN-Normenausschuss Elastomer-Technik (DIN St
6、andards Committee Elastomer Technology), Working Committee NA 045-02-12 AA Gummi- und Kunststoffschluche sowie Schlauchleitungen (Spiegelgremium zu CEN/TC 218; ISO/TC 45/SC 1). The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 4671:2007+A
7、1:2011 DIN EN ISO 4671:2012 ISO 23529 DIN ISO 23529 Amendments This standard differs from DIN EN ISO 7233:2008-07 as follows: a) the standard has been editorially and technically revised; b) Clause 2 has been revised; c) Clause 3 has been included; d) in Clause 11, Figure 2 has been added; e) in Cla
8、use 11, minor axes D2and D3have been introduced; f) Clause 12 has been revised to assess the observations for method C. Previous editions DIN EN ISO 7233: 1995-04, 2008-07 National Annex NA (informative) Bibliography DIN EN ISO 4671:2012, Rubber and plastics hoses and hose assemblies Methods of meas
9、urement of the dimensions of hoses and the lengths of hose assemblies DIN ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7233 October 2016 ICS 23.040.70 Supersedes EN ISO 7233:2008Engl
10、ish Version Rubber and plastics hoses and hose assemblies - Determination of resistance to vacuum (ISO 7233:2016) Tuyaux et flexibles en caoutchouc et en plastique - Dtermination de la rsistance laspiration(ISO 7233:2016) This European Standard was approved by CEN on 24 October 2016. CEN members are
11、 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 t
12、he 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 Cen
13、tre 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuan
14、ia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-10
15、00 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7233:2016 EGummi und Kunststoffschluche und schlauchleitungen Bestimmung der Bestndigkeit gegen Vakuum(ISO 7233:2016)European foreword .3Introduction 51 Scope . 6
16、2 Normative references 63 Terms and definitions . 64 Principle 65 Apparatus . 66 Test pieces . 77 Conditioning of test pieces . 78 Test pressure 79 Procedure (method A) 710 Procedure (method B) 711 Procedure (method C) 712 Test report . 9Bibliography . 11Contents PageDIN EN ISO 7233:2017-03 EN ISO 7
17、233:2016 (E)2Foreword . 4European foreword This document (EN ISO 7233:2016) has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products“ in collaboration with Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies” the secretariat of which is held by BSI. Th
18、is 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 April 2017, and conflicting national standards shall be withdrawn at the latest by April 2017. Attention is drawn to the possibility that some of the
19、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 ISO 7233:2008. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the fol
20、lowing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
21、 Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 7233:2016 has been approved by CEN as EN ISO 7233:2016 without any modification. DIN EN ISO 7233:2017-03 EN ISO 7233:2016 (E) 3 ForewordISO (the Inter
22、national 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
23、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 st
24、andardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accor
25、dance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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. Details
26、 of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endor
27、sement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
28、The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Rubber and plastics hoses and hose assemblies.This fourth edition cancels and replaces the third edition (ISO 7233:2006), which has been technically revised with the following changes: Clause 11
29、has been re-written to clarify further on the minor axis measurement (D2and D3) as shown in the new Figure 2; as well as addition of a paragraph for examining interior and exterior of the hose; Clause 12 f) has been re-written to include the observation that needs to be made for method C.DIN EN ISO
30、7233:2017-03 EN ISO 7233:2016 (E)4 IntroductionVacuum testing is applied to hoses to determine whether they will withstand the differential pressure encountered in service resulting from reduced pressure within the hose.DIN EN ISO 7233:2017-03 EN ISO 7233:2016 (E) 5 1 ScopeThis document specifies th
31、ree methods for determining the resistance to vacuum of hoses and hose assemblies manufactured from plastic or rubber. Applicable dimensions of hoses for each method are as follows: method A for hoses of nominal bore up to and including 80 mm; method B for hoses of nominal bore greater than 80 mm; m
32、ethod C for hoses of all dimensions.Methods A and B can also be used to check the adhesion of the lining to the reinforcement (delamination) in a length of hard-wall hose or hose assembly.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of thei
33、r content constitutes requirements 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 4671:2007, Rubber and plastics hoses and hose assemblies Methods of measurement of t
34、he dimensions of hoses and the lengths of hose assembliesISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 8330 apply. ISO and IEC maintain terminol
35、ogical databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp4 PrincipleThe test methodology for determining the resistance to vacuum of plastic and rubber hoses and
36、hose assemblies consists of reducing the internal pressure in a length of hose by means of a vacuum pump and gauge, while examining the hose for any signs of deformation or delamination of reinforcement or lining.5 Apparatus5.1 Vacuum pump, provided with a gauge and capable of reducing the internal
37、pressure in the hose within 60 s to the pressure specified in the product standard for the hose under test and maintaining it at that pressure for a minimum of 10 min.DIN EN ISO 7233:2017-03 EN ISO 7233:2016 (E)6 5.2 Smooth, solid ball (for method A), with a diameter equal to 0,9 times the bore of t
38、he hose under test, rounded down to the nearest whole millimetre.5.3 Two transparent airtight plates (for method B), for sealing each end of the hose. One of the plates shall permit attachment of the vacuum pump to the hose, while allowing internal visual inspection of the hose during the test.6 Tes
39、t piecesIf the complete hose or hose assembly is more than 1 m long, each test piece shall consist of a minimum length of hose, clear of the end fittings, of 1 m. If the complete hose or hose assembly is less than 1 m long, the complete length shall be used.7 Conditioning of test piecesNo tests shal
40、l be carried out within 24 h of manufacture. Test pieces shall be conditioned at the appropriate temperature in accordance with ISO 23529 for at least 3 h before testing.This 3 h period may form part of the minimum period of 24 h between manufacture and testing.8 Test pressureThe internal pressure t
41、o which the hose is subjected to for the duration of the test shall be that stated in the product standard for the hose under test as being the minimum internal pressure which the hose is required to withstand.9 Procedure (method A)Lay out the hose as straight as possible on a flat surface and blank
42、 off one end to form an airtight seal. Insert into the hose a smooth, solid ball (5.2) and then connect the open end of the hose to a vacuum pump and gauge. Reduce the pressure in the hose within 60 s to the required test pressure and maintain this pressure for the required period, which shall not b
43、e less than 10 min.While the test pressure is being maintained, examine the hose externally for any signs of indentation or collapse and then tilt the hose to permit the solid ball to traverse the full length of the hose to check for any obstructions caused by internal deformation or delamination.10
44、 Procedure (method B)Lay out the hose as straight as possible on a flat surface and fit transparent airtight plates (5.3) to both ends of the hose, one of which shall then be connected to a vacuum pump and gauge. Reduce the pressure in the hose within 60 s to the required test pressure and maintain
45、this pressure for the required period, which shall not be less than 10 min.While the test pressure is being maintained, examine the interior of the hose through one of the transparent plates by means of illumination supplied through the transparent plate at the other end of the hose for signs of del
46、amination or blistering of the lining. Also examine the exterior of the hose for signs of indentation or collapse.11 Procedure (method C)Lay out the hose as straight as possible on a flat surface, blank off one end to form an airtight seal, and connect the other end to a vacuum pump and gauge.DIN EN
47、 ISO 7233:2017-03 EN ISO 7233:2016 (E) 7 Before reducing the pressure in the hose, mark two lines (lines A and B), equidistant from the centre and 500 mm apart, round the hose (see Figure 1). Then, mark a third line (line C) round the hose at a point between lines A and B. Measure the average outsid
48、e diameter of the hose round line C in accordance with the method specified in ISO 4671:2007, 5.2.Dimensions in millimetresKeyA, B lines marked on test piece for measurement of change in lengthC line marked on test piece for measurement of change in outside diameterFigure 1 Marking measurement lines on test pieceKey1 minor axis (D2, D3)Figure 2 Minor axis of a def
