BS 3682-1-1994 Specification for railway brake hose - Specification for compressed air brake hose《铁路制动管规范 第1部分 压缩空气制动管规范》.pdf

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1、BRITISH STANDARD BS 3682-1: 1994 Railway brake hose Part 1: Specification for compressed air brake hoseBS3682-1:1994 This British Standard, having been prepared under the directionof the Plastics and Rubber Standards Policy Committee, was published underthe authority of the Standards Board and comes

2、 intoeffect on 15 July1994 BSI 04-1999 First published December 1963 Second edition October 1969 Third edition as Part 1 July 1994 The following BSI references relate to the work on this standard: Committee reference PRM/66 Draft for comment 92/43416 DC ISBN 0 580 22857 6 Committees responsible for

3、this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/66, upon which the following bodies were represented: Association of Metropolitan Authorities British Coal Corporation British Compres

4、sed Gases Association British Rubber Manufacturers Association Ltd. British Telecommunications plc Chief and Assistant Chief Fire Officers Association Energy Industries Council Fire Extinguishing Trades Association Home Office Institution of Fire Engineers Liquefied Petroleum Gas Industry Technical

5、Association (UK) London Fire and Civil Defence Authority Ministry of Defence Society of Motor Manufacturers and Traders Ltd. The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Fluid Power Association British Gas plc Amendments issued

6、 since publication Amd. No. Date CommentsBS3682-1:1994 BSI 04-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Construction 1 4 Dimensions 1 5 Properties 1 6 Marking 3 Annex A (normative) Hose assembly integrity tests 4 Figure A.1 Hose t

7、est nipple 4 Table 1 Dimensions 1 Table 2 Mandrels for type 1 hose 2 Table A.1 Hose test nipples 5 List of references Inside back coverBS3682-1:1994 ii BSI 04-1999 Foreword This Part of BS3682 has been prepared under the direction of the Plastics and Rubber Standards Policy Committee. It is a part r

8、evision of BS3682:1969 which is renumbered as BS3682-2 and declared obsolescent. This British Standard covers hoses normally used on traction units and rolling stock, e.g.inter-vehicle connections, complete vehicle air systems, body bogie connections, or as otherwise specified by the end user. The19

9、69 edition of BS3682 specified for coupling hoses only. This standard covers compressed air hose. The1969 edition of BS3682 specified requirements for both compressed air brake hose and vacuum brake hose. The requirements for vacuum brake hose are included in BS3682-2. Changes to requirements for co

10、mpressed air hose from the previous edition include the following: a) addition of construction requirements regarding end capping; b) clarification of the test for ozone cracking; c) addition of a hose assembly integrity test; d) reduction in the permitted angle of rotation under a hydrostatic press

11、ure test; e) marking of hose to reflect current practice; f) incorporation of a test to confirm suitable oil resistance of the liner; g) incorporation of hose assembly integrity tests. There is an awareness that there are user requirements to develop hoses with markedly reduced flammability and toxi

12、city for specific applications, e.g.underground services. Proposals also exist in EEC legislation which may in the future affect the standing of this standard and possibly other standards used in railway systems. A British Standard does not purport to include all the necessary provisions of a contra

13、ct. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi and ii, pages1 to6, an inside back cover a

14、nd a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS3682-1:1994 BSI 04-1999 1 1 Scope This Part of BS3682 specifies requirements for hose used in the compressed air sys

15、tems of railway traction units and rolling stock. Hose for use in compressed air systems is operated at pressures up to a maximum of11.5 bar 1)and within the temperature range25C to+65C. 2 Normative references This Part of BS3682 incorporates, by dated or undated reference, provisions from other pub

16、lications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this Part of BS3682 only w

17、hen incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 3 Construction The hose shall consist of: a) a seamless rubber lining; b) a textile reinforcement; c) a rubber cover resistant to abr

18、asion, outdoor exposure and affording durability within the railway environment. Both the lining and the cover shall be uniform, free from air holes, porosity and other defects. The hose shall be reasonably concentric. For hose up to and including22.0mm(7/8in) bore, the wall thickness in any cross s

19、ection shall vary not morethan0.8mm(1/32in) and for hose above22.0mm (7/8in) not more than1.2mm(3/64in). The thickness of the lining for hose of12.5mm(1/2in) bore shall be not less than2.4mm(3/32in) and for hose above12.5mm(1/2in) not less than3.2mm (1/8in). The reinforcement shall be free of any kn

20、otted strands and shall be well impregnated with a suitable rubber. The thickness of the outer cover shall be not less than1.6mm(1/16in) at any point. The cover shall not be corrugated and shall be free from abrasive particles or ingredients. NOTEThe cover may have a shallow cloth marked finish. The

21、 textile reinforcement shall comprise synthetic fibres which are not adversely affected by exposure to the elements in normal use, and thus sealing of exposed ends of the hose when cut to length may be omitted. 4 Dimensions The bore and outside diameter of the hose shall be in accordance with Table

22、1. The length shall be as specified by the purchaser subject to the following tolerances: length up to and including2.0m (78.74in): 5.0mm ( 3/16in); length over2.0 m:1%of specified length. 5 Properties 5.1 Tensile strength When tested in accordance with BS903-A2, the lining shall have a tensile stre

23、ngth of not less than14 MN/m 2 2)and an elongation at break of not less than500%. The cover shall have a tensile strength of not less than10.5MN/m 2 and an elongation at break of not less than300%. Table 1 Dimensions 1) 1 bar=110 5 N/m 2 =10 5 Pa. 2) 1MN/m 2 =145lbf/in 2 . Designation of hose a(nomi

24、nal bore of pipe on vehicle) Bore of hose and allowed tolerances Outside diameter of hose and allowed tolerances mm (in) mm (in) mm (in) # 9.5 (3/8) 12.5 0.8 (1/2 1/32) 25.0 1.2 (1 3/64) 12.5 (1/2) 17.5 0.8 (11/16 1/32) 31.5 1.2 (1 1/4 3/64) 19.0 (3/4) 22.0 0.8 (7/8 1/32) 38.0 1.2 (1 1/2 3/64) 25.0

25、(1) 28.5 0.8 1 1/8 1/32) 44.5 1.6 (1 3/4 1/16) 32.0 (1 1/4) 35.0 0.8 (1 3/8 1/32) 51.0 1.6 (2 1/16) a Retained in inch units as accepted international usageBS3682-1:1994 2 BSI 04-1999 5.2 Adhesion The layers of rubber and fabric, when prepared as ring pieces and subjected to the machine test describ

26、ed in BS903-A12 with a force applied as listed below, shall not separate at a rate of more than25.0mm(1in)per minute. The adhesion shall be tested between the following: a) inner lining and reinforcement:80 N 3) ; b) the layers of reinforcement (if more than one): 80N; c) reinforcement and outer cov

27、er: 71N. 5.3 Ageing resistance Samples of lining and cover similar to those prepared for5.1, shall be aged for(168 2)h at a temperature of(70 1)C in an oven as described in method A of BS903-A19. The samples, when tested as described in5.1, shall show results which do not vary by more than20%from th

28、e unaged values. 5.4 Low temperature A sample of hose25mm(1in) long shall be held for1h at a temperature of (30 2)C and whilststill at this temperature shall be compressedbetween parallel plates until the inner surfaces of the hose are in contact for a period of10min. The speed of application of loa

29、d shall be500mm per minute. Under this condition the various layers shall show no signs of separation and neither the lining nor the cover shall crack. 5.5 Pressure testing A finished length of hose shall not develop any crack or defect when subjected to a hydrostatic pressure of14bar for10min. The

30、required pressure shall bereached at a rate of1.75bar per second to3.5barper second. The hose shall not expand in circumference by more than10%of its initial circumference. While under the above pressure, the length when measured between two reference marks clear of the end fittings shall not vary b

31、y more than 3%, and the angle of rotation shall not exceed5 per metre length of hose. The pressure shall be increased at the rate of1.75bar per second to3.5bar per second until the hose bursts. The bursting pressure shall be not less than50bar. After testing the length of hose shall be destroyed. 5.

32、6 Ozone cracking A sample of the hose cover shall be subjected to20% elongation and held for70h at50C in an atmosphere containing50parts of ozone per100million parts of air as described in BS903-A43. After the test, when the specimens are viewed under magnification 10, no cracks shall be visible. Pr

33、ior to commencement of the test the hose cover sample shall be viewed under10 magnification so that subsequent comparison after testing will confirm that any marks on the surface have resulted from the exposure of the sample to ozone, and were not present prior to commencement of the test. 5.7 Resis

34、tance to liquids When tested in accordance with the volumetric method described in BS903-A16 using oil No.1 and immersing for72 h at (70 2)C the lining shall not have a volume change greater than50 %. 5.8 Non-kinking When a sample of hose is bent to an arc of180 round a mandrel of the appropriate ra

35、dius, given in Table 2, the amount of flattening shall not exceed12%of the nominal outside diameter and the hose shall not kink or show any surface defect. The test shall be carried out at room temperature and, if necessary, handles shall be inserted in the ends of the test piece. Table 2 Mandrels f

36、or type 1 hose 5.9 Hose assembly integrity test When tested in accordance with Annex A, neither of the test nipples shall blow out of the hose. 3) 1N=0.225lbf. Bore of hose Radius of mandrel mm (in) mm (in) 12.5 (1/2) 75 (3) 17.5 (11/16) 100 (4) 22.0 (7/8) 100 (4) 28.5 (1 1/8) 150 (6) 35.0 (1 3/8) 2

37、50 (10)BS3682-1:1994 BSI 04-1999 3 6 Marking Marking shall be carried out by means of a continuous embossed branding along the length of the hose. The marking shall include at least the following information: a) manufacturers name; b) the number of this British Standard, i.e.BS3682-1 4) ; c) date of

38、 manufacture, month and year, e.g.0694 to represent June1994; d) users or purchasers name. The letters and figures shall not be less than4.5mm (3/16 in) in height, and the marking shall be repeated at intervals of not more than450mm. 4) Marking BS3682-1 on or in relation to a product represents a ma

39、nufacturers declaration of conformity, i.e.a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third party certification of conformity, whi

40、ch may also be desirable.BS3682-1:1994 4 BSI 04-1999 Annex A (normative) Hose assembly integrity tests A.1 Assembly Hoses shall be assembled to two test nipples as specified in Figure A.1 and Table A.1. Clean water only shall be employed as a lubricant to assist with assembly. Hoses shall be clipped

41、 using a BAND-IT clip. The tightening of the clip shall be achieved on a well maintained and accurately calibrated BAND-IT clip machine to a value defined in Table A.1. The BAND-IT hose clip forces for this test need not correspond with those forces used on hoses in normal service. A.2 Ageing Place

42、the hose assembly in a suitable oven at a temperature of (70 2)C for a period of100 . Remove the assembly and allow to recover for(24 1) h at a temperature of (20 2)C and a relative humidity of (65 2)%after which the following is carried out. A.3 Test Subject the hose assembly to hydrostatic pressur

43、e as specified in Table A.1for a period of30 . During the test place the hose assembly on a horizontal surface with no restraints on the movement of the assembly. The required pressure shall be reached at the rate of1.75bar per second to3.5bar per second. + 2 0 h + 5 0 min Figure A.1 Hose test nippl

44、eBS3682-1:1994 BSI 04-1999 5 Table A.1 Hose test nipples Nominal size A B C RA RB BAND-IT clip Hydrostatic test pressure Type D E Tightening figure mm (in) mm mm mm mm mm mm mm bar bar 9.5 (3/8) 14.3 15.1 35.0 1.5 3.0 J204 12.7 21.0 3.1 46.5 1.7 12.5 (1/2) 19.5 20.6 45.0 1.5 3.0 J205 15.9 31.0 3.5 4

45、6.5 1.7 19.0 (3/4) 25.4 27.0 45.0 2.5 4.5 J206 15.9 31.0 3.5 46.5 1.7 25.0 (1) 33.0 34.6 45.0 2.5 4.5 J207 15.9 31.0 3.5 46.5 1.7 32.0 (1 1/4) 39.4 41.0 45.0 2.5 4.5 J208 15.9 31.0 3.5 46.5 1.76 blankBS3682-1:1994 BSI 04-1999 List of references (seeclause2) Normative references BSI publications BRIT

46、ISH STANDARDS INSTITUTION, London BS 903, Physical testing of rubber. BS 903-A2:1989, Determination of tensile stress-strain properties. BS 903-A12:1975, Determination of the adhesion strength of vulcanized rubbers to fabrics (ply adhesion). BS 903-A16:1987, Determination of the effect of liquids. B

47、S 903-A19:1986, Heat resistance and accelerated ageing tests. BS 903-A43:1990, Method for determination of resistance to ozone cracking (static strain test). BS 3682-1: 1994 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for p

48、reparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editio

49、ns. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. B