1、BSI Standards PublicationBS EN ISO 8308:2015Rubber and plastics hoses andtubing Determination oftransmission of liquids throughhose and tubing wallsBS EN ISO 8308:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 8308:2015.It supersedes BS EN ISO 8308:200
2、8 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/66, Rubber and plastics tubing, hoses and hoseassemblies.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include
3、all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 89090 1ICS 23.040.70Compliance with a British Standard cannot confer immunity fromlegal obligations.This British S
4、tandard was published under the authority of theStandards Policy and Strategy Committee on 31 October 2015.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8308 October 2015 ICS 23.040.70 Supersedes EN ISO 8308:2008English Versi
5、on Rubber and plastics hoses and tubing - Determination of transmission of liquids through hose and tubing walls (ISO 8308:2015) Tuyaux et tubes en caoutchouc et en plastique - Dtermination de la transmission des liquides travers les parois des tuyaux et des tubes (ISO 8308:2015) Gummi- und Kunststo
6、ffschluche mit und ohne Einlagen - Bestimmung der Durchlssigkeit von Schlauchwandungen gegenber Flssigkeiten (ISO 8308:2015) This European Standard was approved by CEN on 29 August 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givi
7、ng 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 the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three offi
8、cial 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 Centre has the same status as the official versions. CEN members are the national standards bodies of
9、 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, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
10、Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for
11、 CEN national Members. Ref. No. EN ISO 8308:2015 EBS EN ISO 8308:2015EN ISO 8308:2015 (E) 3 European foreword This document (EN ISO 8308:2015) has been prepared by Technical Committee ISO/TC 45 “Rubber andrubber products“ in collaboration with Technical Committee CEN/TC 218 “Rubber and plastics hose
12、sand hose assemblies” the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of anidentical text or by endorsement, at the latest by April 2016, and conflicting national standards shall bewithdrawn at the latest by Apri
13、l 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject ofpatent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patentrights. This document supersedes EN ISO 8308:2008. According to the CEN-CENELEC Internal
14、 Regulations, the national standards organizations of thefollowing 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,
15、 Italy, Latvia, Lithuania, Luxembourg, Malta,Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,Turkey and the United Kingdom.Endorsement notice The text of ISO 8308:2015 has been approved by CEN as EN ISO 8308:2015 without any modification. BS EN ISO 8308
16、:2015ISO 8308:2015(E)Foreword iv1 Scope . 12 Normative references 13 Principle 13.1 Method A 13.2 Method B 14 Test liquid 15 Method A . 25.1 Apparatus 25.2 Test pieces . 25.3 Test temperature . 35.4 Test pressure. 35.5 Procedure 35.6 Expression of results 35.7 Test report . 46 Method B . 46.1 Appara
17、tus 46.2 Test piece . 56.3 Test temperature . 56.4 Procedure 56.5 Expression of results 66.6 Test report . 7 ISO 2015 All rights reserved iiiContents PageBS EN ISO 8308:2015ISO 8308:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standard
18、s 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 organiz
19、ations, 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.The procedures used to develop this document and those intended for its fur
20、ther 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 accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directi
21、ves).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 of any patent rights identified during the development of the document will be in the In
22、troduction 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 endorsement.For an explanation on the meaning of ISO specific terms and expressions related to
23、 conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Hoses
24、 (rubber and plastics).This fourth edition cancels and replaces the third edition (ISO 8308:2006), which has been technically revised with changes in Clause 1, 5.2, 5.4, 5.7 b) and 6.6 b).iv ISO 2015 All rights reservedBS EN ISO 8308:2015INTERNATIONAL STANDARD ISO 8308:2015(E)Rubber and plastics hos
25、es and tubing Determination of transmission of liquids through hose and tubing walls1 ScopeThis International Standard specifies two methods for the determination of transmission of liquids through hose and tubing walls. Both methods are applicable to rubber and plastics hose and tubing, and compris
26、e: method A, for all hose and tubing sizes and constructions: a practical comparative test, simulating working conditions; method B, for hose and tubing up to 16 mm inside diameter.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are
27、 indispensable for its application. For dated references, 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 assemblies Methods of measurement of the dimensions of hoses
28、 and the lengths 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 an assembly mounted in a test apparatus fitted
29、with equipment to fill and measure a charged volume of a volatile liquid. The system is put under pressure, and the change in volume measured at 24 h intervals until the change has become constant with time, i.e. an equilibrium state has been reached. The test result is this steady-state evaporation
30、 rate, expressed as the volume of liquid lost per hour per unit inside surface 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 end of the hose or tubing being plugged. The reservoir is partially fill
31、ed with test liquid and sealed. The assembly is weighed at the start of the test, and once every 24 h for eight days. The test result is the maximum mass of liquid lost in any one 24 h period per unit inside surface area of the hose or tubing.NOTE The method accounts for loss by permeation and evapo
32、ration and helps to minimize selective permeation of components in a fuel mixture since the liquid is agitated daily.4 Test liquidThe test liquid shall be that specified in the appropriate product standard. ISO 2015 All rights reserved 1BS EN ISO 8308:2015ISO 8308:2015(E)5 Method AWARNING Because of
33、 the presence of potentially hazardous vapours, ensure that this test is carried out in a well-ventilated area.5.1 ApparatusThe apparatus consists of a nitrogen gas source connected to a pipe system. The gas pressure is controlled by a regulator and pressure gauge.It is essential that the system be
34、provided with a safety valve.The test piece is fixed vertically and is connected to the apparatus at the top via a measuring cylinder conforming 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
35、gauge6 venting valve7 measuring cylinder8 test piece9 charging valve10 safety shieldFigure 1 Apparatus for method A5.2 Test piecesEach test piece shall be either a hose assembly with a free hose length of 250 mm, or a sample of tubing, in accordance with Figure 2, fitted with suitable couplings and
36、adapters.Three test pieces shall be tested.2 ISO 2015 All rights reservedBS EN ISO 8308:2015ISO 8308:2015(E)Dimensions in millimetresFigure 2 Internal free length, with tolerance, of test piece5.3 Test temperatureThe test temperature shall be one of the standard temperatures defined in ISO 23529, i.
37、e. either (23 2) C or (27 2) C in accordance with national practice.5.4 Test pressureThe test pressure shall be 50 kPa 5 kPa (0,5 bar 0,05 bar) gauge pressure.5.5 Procedure5.5.1 Determine the internal free length, l, as indicated in Figure 2, and the inside diameter, d, as specified in ISO 4671.5.5.
38、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 mark of the measuring cylinder.5.5.4 Maintain the test piece at the test pressure for 5 min, compensating for the dilation of the hose or tubin
39、g at the test pressure. Release the pressure and allow the dissolved nitrogen to escape over a period of 5 min, then record the initial reading, V1, shown by the measuring cylinder.5.5.5 Apply the test pressure.5.5.6 Take measurements after 24 h, 48 h, 72 h and 96 h, using the following method:Close
40、 the main valve, then release the test pressure and wait 5 min before recording the new reading of V1. Close the venting valve, and then open the main valve to re-apply the test pressure.If, after 96 h, the loss in volume per 24 h interval has not stabilized, take another measurement after 120 h (an
41、d another after 144 h, if necessary).5.6 Expression of results5.6.1 Calculate the loss in volume for each 24 h interval between measurements, and determine the point at which the loss becomes constant. Beyond this point, diffusion of the liquid into the hose or tubing wall no longer contributes to t
42、he loss in volume, and the loss observed thus represents evaporation only.5.6.2 If the steady-state is reached before 72 h, calculate the evaporation rate, in millilitres per square metre per hour, using Formula (1): ISO 2015 All rights reserved 3BS EN ISO 8308:2015ISO 8308:2015(E)VVdl72 9661024()pi
43、(1)whereV72is the volume, in millilitres, after 72 h;V96is the volume, in millilitres, after 96 h;d is the inside diameter, in millimetres, of the hose or tubing;l is the internal free length, in millimetres, of the hose or tubing.In cases where further measurements have been made after periods long
44、er than 96 h, replace V72and V96in the above formula by the corresponding penultimate and final volume measurements.5.7 Test reportThe test report shall include the following information:a) full description of the hose or tubing tested;b) a reference to this International Standard and year of public
45、ation, i.e. ISO 8308:2015;c) test method (method A);d) test liquid used;e) steady-state evaporation rate, expressed as millilitres lost per square metre per hour;f) test temperature used;g) date of the test.6 Method B6.1 Apparatus6.1.1 Reservoir unit, consisting of a half-litre can, with a metal-foi
46、l or fluoroelastomer-lined screw-on cap, and with a standard hose nipple soldered into the bottom of the can at the corner opposite the filling hole (see Figure 3).4 ISO 2015 All rights reservedBS EN ISO 8308:2015ISO 8308:2015(E)Key1 standard hose nipple2 hose plug3 lined cap4 hose or tubingFigure 3
47、 Apparatus for method B6.1.2 Scales or balance, with a minimum capacity of 400 g and readable to 0,01 g.6.1.3 Impermeable hose plug, of sufficient size to seal one end of the hose or tubing to a depth of 12,5 mm.6.1.4 Standard hose clamps, of the correct size for the hose or tubing being tested.6.2
48、Test pieceCut hose and tubing to 300 mm length.6.3 Test temperatureThe test temperature shall be one of the standard temperatures defined in ISO 23529, i.e. either (23 2) C or (27 2) C in accordance with national practice.6.4 Procedure6.4.1 Gauge the hose or tubing bore and record the result in mill
49、imetres.6.4.2 Plug one end of the test piece to a depth of 12,5 mm using an impermeable plug (6.1.3), as well as a hose clamp (6.1.4), if necessary.6.4.3 Attach the other end of the test piece to the nipple on the reservoir (6.1.1) to a depth of 12,5 mm, using a hose clamp (6.1.4), if necessary.6.4.4 Fill the reservoir with 300 ml of the specified test liquid.It is important that the test piece remain filled with test liquid during the whole of the test, so that the whole of the inside surface remains in contact w
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