1、BS ISO 7628:2010 ICS 43.040.40; 83.140.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Road vehicles Thermoplastics tubing for air braking systemsThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 Fe
2、bruary 2010 BSI 2010 ISBN 978 0 580 60419 5 Amendments/corrigenda issued since publication Date Comments BS ISO 7628:2010 National foreword This British Standard is the UK implementation of ISO 7628:2010. The UK participation in its preparation was entrusted to Technical Committee AUE/11, Braking sy
3、stems. 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 are responsible for its correct application. Compliance with a British Standard cannot confer immun
4、ity from legal obligations.BS ISO 7628:2010Reference number ISO 7628:2010(E) ISO 2010INTERNATIONAL STANDARD ISO 7628 First edition 2010-02-01 Road vehicles Thermoplastics tubing for air braking systems Vhicules routiers Tuyauteries thermoplastiques de dispositifs de freinage pneumatique BS ISO 7628:
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8、ss given below. COPYRIGHT PROTECTED DOCUMENT ISO 2010 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO
9、at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 7628:2010 ISO 7628:2010
10、(E) ISO 2010 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Marking and identification2 5 Dimensions 3 6 Manufacture .4 6.1 Materials .4 6.2 Tubing.4 7 Installation on the vehicle.4 7.1 Use of tube assemblies on the vehicle .4 7.2 Insta
11、llation precautions 4 8 Testing and requirements.5 9 Test procedures and requirements .7 9.1 Burst test7 9.2 Deformation under pressure 9 9.3 Cold impact test.9 9.4 Impact test after heat ageing10 9.5 Layer adhesion test multilayer pipes 10 9.6 Moisture absorption 10 9.7 Low temperature flexural tes
12、t 10 9.8 Stress cracking test 11 9.9 Resistance to ethanol .12 9.10 Resistance to battery acid12 9.11 Resistance to oil 13 9.12 Resistance to urea solution13 9.13 Heat ageing 14 9.14 Artificial weathering test.14 9.15 Ozone test 14 9.16 Tube assemblies15 Annex A (normative) Cold impact apparatus.16
13、Annex B (normative) Tests on tube assemblies (tube with end fittings)19 Annex C (informative) Method for leak detection in leak-proof testing 22 Annex D (informative) Synopsis of test and corresponding samples.25 Bibliography26 BS ISO 7628:2010 ISO 7628:2010(E) iv ISO 2010 All rights reservedForewor
14、d ISO (the International 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 technica
15、l committee has 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 ele
16、ctrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to th
17、e member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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 ide
18、ntifying any or all such patent rights. ISO 7628 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 2, Braking systems and equipment. This first edition cancels and replaces the second edition of ISO 7628-1:1998, the first edition of ISO 7628-2:1998 and ISO 7628-2/Cor.1:19
19、99, which have been technically revised. BS ISO 7628:2010 INTERNATIONAL STANDARD ISO 7628:2010(E) ISO 2010 All rights reserved 1Road vehicles Thermoplastics tubing for air braking systems WARNING The use of this International Standard may involve hazardous materials, operations, and equipment. This
20、International Standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this International Standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to
21、use. 1 Scope This International Standard specifies the minimum requirements for mono wall and multilayer tubing used in air braking systems on road vehicles. The conformity of production is the responsibility of the tubing manufacturer. The marking of the tubing does not automatically imply that the
22、 tube assembly (i.e. tube with end fittings) is appropriate for its use on a vehicle. It is the responsibility of the tube assembler and/or the vehicle manufacturers to ensure that the tests described in Annex B, relating to the tube assembly itself, are successfully performed. For the requirements
23、on coiled tube assemblies refer to ISO 7375-1 and ISO 7375-2. 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
24、(including any amendments) applies. ISO 179-1, Plastics Determination of Charpy impact properties Part 1: Non-instrumented impact test ISO 1043-1, Plastics Symbols and abbreviated terms Part 1: Basic polymers and their special characteristics ISO 1183-1, Plastics Methods for determining the density
25、of non-cellular plastics Part 1: Immersion method, liquid pyknometer method and titration method ISO 4892-2:2006, Plastics Methods of exposure to laboratory light sources Part 2: Xenon-arc lamps ISO 4892-4:2004, Plastics Methods of exposure to laboratory light sources Part 4: Open-flame carbon- arc
26、lamps ASTM B117, Standard Practice for Operating Salt Spray (Fog) Apparatus BS ISO 7628:2010 ISO 7628:2010(E) 2 ISO 2010 All rights reserved3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 tube tubing which has been cut to its appropriate leng
27、th 3.2 tube assembly tube which has been equipped with suitable end fittings 3.3 tubing without fittings tubing of unspecified length without end fittings 3.4 tubing with fittings tubing of a specified length with end fittings 3.5 impact energy energy determined by means of an impact bending test 4
28、Marking and identification Tubings shall be indelibly marked along a generating line with letters of a minimum height of 2 mm and repeated at least every 350 mm as follows: ISO 7628; tubing category, i.e. either 1 000 kPa or 1 250 kPa for the temperature range 40 C to 100 C; tubing category, 1 250 k
29、Pa; for the temperature range 40 C to 125 C; outside diameter times wall thickness; symbol for the material type, in accordance with ISO 1043-1; manufacturer designation; date code of manufacture. These seven indications shall be separated from each other by slashes. BS ISO 7628:2010 ISO 7628:2010(E
30、) ISO 2010 All rights reserved 35 Dimensions The tubing defined in this International Standard belongs to four possible categories, as defined in Table 1. Table 1 Tubing categories for air braking systems Maximum working pressure Minimum temperature Maximum temperature Category kPa C C 0 1 000 40 80
31、 1 1 000 40 100 2 1 250 40 100 3 a1 250 40 125 aFor use in the engine compartment. Tubing shall have the dimensions given in Table 2. Table 2 Dimensions Nominal tubing size outside diameter Tubing basic outside diameter Outside diameter tolerances Inside diameter basic Inside diameter tolerances Min
32、imum wall thickness, mm mm mm e mm 4 1 4 0,1 2 0,1 0,9 6 1 6 0,1 4 0,1 0,9 8 1 8 0,1 6 0,1 0,9 9 1,5 9 0,1 6 0,1 1,4 10 1 10 0,1 8 0,1 0,9 10 1,25 10 0,1 7,5 0,1 1,15 11 1,5 11 0,15 8 0,15 1,35 12 1,5 12 0,15 9 0,15 1,35 14 2 14 0,15 10 0,15 1,85 15 1,5 15 0,15 12 0,15 1,35 16 2 16 0,15 12 0,15 1,85
33、 18 2 18 0,15 14 0,15 1,85 19 2 19 0,15 15 0,15 1,85 BS ISO 7628:2010 ISO 7628:2010(E) 4 ISO 2010 All rights reserved6 Manufacture 6.1 Materials The tubing shall be extruded from 100 % virgin material (not reground). The use of recycled material is not permitted, but own reworked material may be use
34、d as grinding stock, as long as it does not make up more than 20 % of the new material, is of the same material type and is from the manufacturers own production, and the tubing meets all other requirements of this International Standard. If reinforcement is used, then the user must be satisfied tha
35、t the reinforced tubing is suitable for the application. The materials used may have additives to enhance material performance provided the tubing produced complies with the requirements of this International Standard. 6.2 Tubing 6.2.1 Quality and appearance The tubing shall comply with the requirem
36、ents of this International Standard. The tube shall show no manufacturing faults, voids, scratches, cracks or lack of homogeneity which could affect service use. Additives shall be evenly distributed throughout the material. 6.2.2 Construction 6.2.2.1 General Tubing shall consist of an extrudate of
37、one or more layers. 6.2.2.2 Inner layer The materials used in the inner layer should be able to withstand contact with chemicals found in a system environment. The inner layer of the tubing can be exposed to such an environment at the “ends” that are attached to the various connection points in a sy
38、stem. 6.2.2.3 Colour The outermost layer may be of a different colour to the subsequent layers but must be the colour designated by the end user. 7 Installation on the vehicle 7.1 Use of tube assemblies on the vehicle The choice of appropriate fittings and tube shall be approved by the vehicle manuf
39、acturer. In order to allow its mounting on the vehicle, the tube assembly shall have been tested in accordance with Annex B. 7.2 Installation precautions When installed on a vehicle, the tube shall be routed and supported so as to eliminate chafing, abrasion, kinking or other mechanical damage, mini
40、mize fatigue conditions and avoid excessive sag. The tube should be stored inside a dry environment not exceeding a temperature of 40 C. BS ISO 7628:2010 ISO 7628:2010(E) ISO 2010 All rights reserved 58 Testing and requirements For the purpose of these tests, the tube samples shall be at least two w
41、eeks (336 h) old. Unless otherwise stated, the tests shall be performed at an ambient temperature of (23 2) C, at a relative humidity between 45 % and 75 %, and unpressurized. All burst tests shall be conducted using the same type of fitting. The list of appropriate tests to be performed on the tubi
42、ng is given in Table 3. All the tests listed in Tables 3 and 4 shall be successfully completed before the marking of the tube. Table 3 List of tests Test Subclause Tube size to test Surface appearance 6.2.1 Every Burst at 23 C 9.1.2 Every Burst at 100 C 9.1.3 Every Burst at 125 C 9.1.4 Every Deforma
43、tion under pressure 9.2 Every Cold impact 9.3 Every Impact after ageing 9.4 Every Layer adhesion 9.5 Sample Moisture absorption 9.6 Sample Low temperature flexural 9.7 Sample Stress cracking 9.8 Sample Resistance to ethanol 9.9 Sample Resistance to battery acid 9.10 Sample Resistance to oil 9.11 Sam
44、ple Resistance to urea 9.12 Sample Heat ageing 9.13 Sample Artificial weathering 9.14 Sample Ozone 9.15 Sample Tube assemblies 9.16 Every BS ISO 7628:2010 ISO 7628:2010(E) 6 ISO 2010 All rights reservedTable 4 Requirements Test Requirement Subclause Surface appearance No manufacturing faults, voids,
45、 scratches, cracks or lack of homogeneity which could affect service use. Additives evenly distributed throughout the material. 6.2.1 Burst All five samples: at 23 C 1 000 kPa (10 bar) tubes; 4 000 kPa (40 bar) 1 250 kPa (12,5 bar) tubes; 5 000 kPa (50 bar) 9.1.2 at 80 C 1 000 kPa (10 bar) tubes; 2
46、500 kPa (25 bar) 9.1.3 at 100 C 1 000 kPa (10 bar) tubes; 2 500 kPa (25 bar) 1 250 kPa (12,5 bar) tubes; 3 130 kPa (31,3 bar) 9.1.3 at 125 C 1 250 kPa (12,5 bar) tubes; 2 500 kPa (25 bar) 9.1.4 Deformation under pressure All three samples Deviation between datum lines u 3 % Deviation outer diameter
47、u 10 % initial mean diameter 9.2 Cold impact All five samples No cracks or breaks One sample: cracks or breaks, further ten samples to be tested and pass. 9.3 Impact after ageing All ten samples no cracks or breaks 9.4 Layer adhesion All five samples no cracks or breaks 9.5 Moisture absorption As ag
48、reed between customer and supplier 9.6 Low temperature flexural All three samples No damage Rewound area; pass burst test at 23 C 9.7 Stress cracking All six samples No cracks or breaks Burst pressure at 23 C 80 % of the reference value measured on samples from the same batch 9.8 Resistance to ethan
49、ol All three samples no evidence of cracking 9.9 Resistance to battery acid All three samples No dimensional change exceeding 2% Change in weight u 2% No evidence of cracking Tensile force 80 % of the minimum applied tensile force in accordance with Annex B 9.10 Resistance to oil Average volume change of three samples 80 % initially measured on samples from the same batch All three samples ductile burst area 9.1
