1、BRITISH STANDARDBS EN ISO 8308:2008Rubber and plastics hoses and tubing Determination of transmission of liquids through hose and tubing wallsICS 23.040.70g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g5
2、5g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 8308:2008This British Standard was published under the authority
3、of the Standards Policy and Strategy Committee on 29 February 2008 BSI 2008ISBN 978 0 580 60333 4National forewordThis British Standard is the UK implementation of EN ISO 8308:2008. It is identical to ISO 8308:2006. It supersedes BS EN ISO 8308:1996 which is withdrawn.The UK participation in its pre
4、paration was entrusted to Technical Committee PRI/66, Rubber and plastics tubing, hoses and hose assemblies.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users
5、 are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproductio
6、n or networking permitted without license from IHS-,-,-EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 8308January 2008ICS 23.040.70 Supersedes EN ISO 8308:1995 English VersionRubber and plastics hoses and tubing - Determination oftransmission of liquids through hose and tubing walls (ISO8308:
7、2006)Tuyaux et tubes en caoutchouc et en plastique -Dtermination de la transmission des liquides travers lesparois des tuyaux et des tubes (ISO 8308:2006)Gummi- und Kunststoffschluche mit und ohne Einlagen -Bestimmung der Durchlssigkeit von Schlauchwandungengegenber Flssigkeiten (ISO 8308:2006)This
8、European Standard was approved by CEN on 26 December 2007.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 reference
9、s 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 it
10、s 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, Lithu
11、ania, 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 2008 CEN
12、All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 8308:2008: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-For
13、eword The text of ISO 8308:2006 has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 8308:2008 by Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies“, t
14、he secretariat of which is held by BSI. 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 2008, and conflicting national standards shall be withdrawn at the latest by July 2008. Attention is dr
15、awn 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 ISO 8308:1995. According to the CEN/CENELEC Internal Regulations, the nat
16、ional 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,
17、 Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 8308:2006 has been approved by CEN as EN ISO 8308:2008 without any modifications. BS EN ISO 8308:2008Copyright European Committee for Standardization Provided by IHS
18、under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-INTERNATIONALSTANDARDISO8308Third edition2006-10-15Reference numberISO 8308:2006(E)Rubber and plastics hoses and tubing Determination of transmission of liquids through hose and tubing wallsTuyau
19、x et tubes en caoutchouc et en plastique Dtermination de la transmission des liquides travers les parois des tuyaux et des tubesBS EN ISO 8308:2008Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without lice
20、nse from IHS-,-,-iiCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-iiiContents Page1 Scope 12 Normative references 13 Principle 13.1 Method A 13.2 Method B 14 Test liquid . 15 Me
21、thod A 25.1 Apparatus . 25.2 Test pieces . 35.3 Test temperature . 35.4 Test pressure . 35.5 Procedure . 35.6 Expression of results 45.7 Test report 46 Method B 46.1 Apparatus . 46.2 Test piece . 46.3 Test temperature . 56.4 Procedure . 56.5 Expression of results 76.6 Test report 7BS EN ISO 8308:200
22、8Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ivForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies(ISO mem
23、ber bodies). The work of preparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmenta
24、l andnon-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives
25、, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of the member bodies casti
26、ng a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 8308 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommit
27、tee SC 1,Hoses (rubber and plastics).This third edition cancels and replaces the second edition (ISO 8308:1993), which has been technically revised,the main changes being made in the procedure for method B.BS EN ISO 8308:2008Copyright European Committee for Standardization Provided by IHS under lice
28、nse with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1Rubber and plastics hoses and tubing Determination of transmission of liquids through hose and tubing walls1ScopeThis International Standard specifies two methods for the determination of transmission of
29、liquids through hoseand tubing walls. Both methods are applicable to rubber and plastics hose and tubing, and comprise: method A, for all hose sizes and constructions: a practical comparative test, simulating working conditions; method B, for hose and tubing up to internal diameter.2 Normative refer
30、encesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenced document(including any amendments) applies.ISO 4671, Rubber and plastics hoses and hose as
31、semblies Methods of measurement of dimensions ofhoses and length of hose assembliesISO 4788, Laboratory glassware Graduated measuring cylindersISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods3 Principle3.1 Method AThis method is carried out on
32、 an assembly mounted in a test apparatus fitted with equipment to fill and measurea charged volume of a volatile liquid. The system is put under pressure, and the change in volume measured atintervals until the change has become constant with time, i.e. an equilibrium state has been reached. Thetest
33、 result is this steady-state evaporation rate, expressed as the volume of liquid lost per hour per unit insidesurface area of the hose or tubing.3.2 Method BThis method uses a pressureless reservoir. A length of hose or tubing is attached to the reservoir, the other endof the hose or tubing being pl
34、ugged. The reservoir is partially filled with test liquid and sealed. The assembly isweighed at the start of the test, and once every for eight days. The test result is the maximum mass ofliquid lost in any one period per unit inside surface area of the hose or tubing.NOTE The method accounts for lo
35、ss by permeation and evaporation and helps to minimize selective permeation ofcomponents in a fuel mixture since the liquid is agitated daily.4 Test liquidThe test liquid shall be that specified in the appropriate product standard.16 mm24 h24 h24 hBS EN ISO 8308:2008Copyright European Committee for
36、Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-25 Method AWARNING Because of the presence of potentially hazardous vapours, ensure that this test is carriedout in a well-ventilated area.5.1 ApparatusThe apparat
37、us consists of a nitrogen gas source connected to a pipe system. The gas pressure is controlled bya regulator and pressure gauge.It is essential that the system be provided with a safety valve.The test piece is fixed vertically and is connected to the apparatus at the top via a measuring cylindercon
38、forming to ISO 4788 and at the bottom via a charging valve (see Figure 1).Key1 pressurized-nitrogen source2 pressure regulator3 main valve4 safety valve5 pressure gauge6 venting valve7 measuring cylinder8 test piece9 charging valve10 safety shieldFigure 1 Apparatus for method ABS EN ISO 8308:2008Cop
39、yright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-35.2 Test piecesEach test piece shall be either a hose assembly with a free hose length of , or a sample of tubing, inaccordance with
40、 Figure 2, fitted with suitable couplings and adapters.Three test pieces shall be tested.5.3 Test temperatureThe test temperature shall be one of the standard temperatures defined in ISO 23529, i.e. either orin accordance with national practice.5.4 Test pressureThe test pressure shall be gauge press
41、ure5.5 Procedure5.5.1 Determine the internal free length , as indicated in Figure 2, and the internal diameter , as specified inISO 4671.5.5.2 Connect the test piece to the test apparatus (see Figure 1).5.5.3 Fill the test piece and the measuring cylinder with test liquid up to the top graduation ma
42、rk of themeasuring cylinder.5.5.4 Maintain the test piece at the test pressure for , compensating for the dilation of the hose or tubingat the test pressure. Release the pressure and allow the dissolved nitrogen to escape over a period of ,then record the initial reading shown by the measuring cylin
43、der.5.5.5 Apply the test pressure.5.5.6 Take measurements after , , and , using the following method:Close the main valve, then release the test pressure and wait before recording the new reading of .Close the venting valve, and then open the main valve to re-apply the test pressure.If, after , the
44、loss in volume per interval has not stabilized, take another measurement after (andanother after if necessary).Dimensions in millimetresFigure 2 Internal free length, with tolerance, of test piece250 mm(23 2)C(27 2)C0,5 bar 0,05 barl d5 min5 minV124 h 48 h 72 h 96 h5 min V196 h 24 h 120 h144 hBS EN
45、ISO 8308:2008Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-45.6 Expression of results5.6.1 Calculate the loss in volume for each interval between measurements, and determine th
46、e point atwhich the loss becomes constant. Beyond this point, diffusion of the liquid into the hose or tubing wall no longercontributes to the loss in volume, and the loss observed thus represents evaporation only.5.6.2 If the steady state is reached before , calculate the evaporation rate, in milli
47、litres per square metreper hour, using the formulawhereis the volume, in millilitres, after ;is the volume, in millilitres, after ;is the internal diameter, in millimetres, of the hose or tubing;is the internal free length, in millimetres, of the hose or tubing. In cases where further measurements h
48、ave been made after periods longer than , replace and inthe above formula by the corresponding penultimate and final volume measurements.5.7 Test reportThe test report shall include the following information:a) a full description of the hose or tubing tested;b) a reference to this International Standard;c) the test method (method A);d) the test liquid used;e) the steady-state evaporation rate, expressed as millilitres lost per square metre per hour;f) the test temperature used;g) the date of the test.6 Method B
