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1、BRITISH STANDARD BS AU 110a: 1995 Specification for Rubber hoses and hose assemblies for automotive air pressure braking systems UDC 629.3.02-592.5:62-462-036.4 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI B
2、S AU 110a:1995 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 December 1995 BSI 07-1999 First published October 1965 Second edition December 1995 The
3、 following BSI references relate to the work on this standard: Committee reference PRI/66/2 Draft for comment 94/302466 DC ISBN 0 580 24682 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee PRI/66, Hoses, to Subcommittee
4、PRI/66/2, Hoses and tubing for internal combustion engines, upon which the following bodies were represented: British Rubber Manufacturers Association Ltd. LP Gas Association Ministry of Defence Society of Motor Manufacturers and Traders Limited Co-opted Members Amendments issued since publication A
5、md. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 110a:1995 BSI 07-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2References1 3Definition1 4Types1 5Cons
6、truction1 6Dimensions and tolerances1 7Conditioning1 8Performance2 9Marking2 Annex A (normative) Ageing test3 Annex B (normative) Leakage under pressure3 Annex C (normative) Flexure test4 Figure A.1 Hose positioning for ageing test3 Figure C.1 Curved hose4 Figure C.2 Flexure test5 Table 1 Dimensions
7、 and tolerances of diameters1 Table 2 Minimum bend radius1 Table A.1 Dimensions of hose test pieces and former3 Table C.1 Dimensions for flexure test5 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:50 GMT+00:00 2006, Un
8、controlled Copy, (c) BSI BS AU 110a:1995 ii BSI 07-1999 Foreword This British Standard has been prepared by Subcommittee PRI/66/2. It supersedes BS AU 110:1965, which is withdrawn. This revision brings the specification broadly into line with SAE J1402 1, a specification to which a proportion of thi
9、s type of hose is manufactured in the UK, but this British Standard specifies higher operating temperatures. The specification has been improved by the addition of several tests and more stringent requirements so that the standard more accurately reflects current demands and the product is better ab
10、le to carry out its safety critical function. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligati
11、ons. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and 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 the
12、inside front cover. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 110a:1995 BSI 07-19991 1 Scope This British Standard specifies the dimensions, construction and performance requirements for two types o
13、f hose and hose assemblies used in all parts of air pressure brake systems. NOTEBoth types are designed for operation at a maximum working pressure of 15.5 bar, and are distinguished by their recommended temperature ranges of operation. 2 References 2.1 Normative references This British Standard inc
14、orporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to o
15、r revisions of the cited publication apply to this British Standard only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publications applies, together with any amendments. 2.2 Informative references This British Standard refers to
16、 other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Definitions For the purposes of this British Standard the definitions giv
17、en in BS 3558 apply, together with the following. hose assembly hose with either permanent or reusable end fittings attached 4 Types There are two types of hose for use within the following temperature ranges: a) type A; for use within the temperature range 40 C to + 125 C; b) type B; for use within
18、 the temperature range 40 C to 150 C. 5 Construction The hoses shall consist of: a) a rubber lining with smooth bore and resistant to oil; b) a textile reinforcing layer or layers, plied, braided or spirally wound; c) a rubber cover resistant to oil and hydrocarbons, ageing and ozone. The lining and
19、 cover shall be free from holes, porosity and other defects. NOTEThe hoses may be either mandrel or non-mandrel made and finished smooth or fabric marked. 6 Dimensions and tolerances 6.1 Diameters When measured in accordance with BS EN 24671 the internal and external diameters shall be as given in T
20、able 1. 6.2 Limits on cut lengths of hose NOTEThe nominal length of hose should be specified by the purchaser. When measured in accordance with BS 5173-101.2 the tolerance on cut lengths shall be 1 % of the nominal length. 6.3 Minimum bend radius The minimum bend radius for installation shall be as
21、given in Table 2. Table 1 Dimensions and tolerances of diameters Table 2 Minimum bend radius 7 Conditioning Tests given in 8.1 to 8.11 shall be carried out on test pieces taken from hoses or hose assemblies that have undergone the following water immersion conditioning. The hose or hose assembly sha
22、ll be immersed in distilled water at (23 2) C for (168 2) h while bent to the minimum bend radius given in Table 2. The hose ends and couplings shall be completely capped during immersion. Dimensions in millimetres Nominal internal diameter Tolerance on internal diameter Nominal external diameter To
23、lerance on external diameter 6.3 10.0 12.5 14.0 16.0 0.40 0.40 0.50 0.50 0.50 16.0 19.0 22.2 25.4 27.0 0.50 0.50 0.60 0.60 0.60 Dimensions in millimetres Nominal internal diameterMinimum bend radius 6.3 10.0 12.5 14.0 16.0 64 89 102 108 114 Licensed Copy: London South Bank University, London South B
24、ank University, Sat Dec 09 02:08:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 110a:1995 2 BSI 07-1999 8 Performance 8.1 Resistance to ageing When tested in accordance with Annex A, the hose shall show no signs of cracking, charring or disintegration, either internally or externally. 8.2 Low t
25、emperature flexibility When tested in accordance with method B of BS EN 24672:1993 at a temperature of ( 40 2) C, the hose shall show no signs of cracking when examined visually, and shall conform to 8.4. 8.3 Change in length When tested in accordance with BS 5173-101.2, using an applied pressure of
26、 15.5 bar1), the maximum change in length shall be in the range 7 % to + 5 %. 8.4 Proof pressure test when tested in accordance with BS 5173-102.1 the hose or hose assembly shall not leak or show signs of failure at a hydrostatic pressure of 31 bar. 8.5 Burst pressure test when tested in accordance
27、with BS 5173-102.1 the hose or hose assembly shall not burst, leak or show signs of failure at a hydrostatic pressure less than 62 bar. 8.6 Air leak When tested in accordance with Annex B the hose or hose assembly shall show no leakage on visual examination. 8.7 Swell test A test piece taken from bo
28、th the lining and cover after immersion in oil no. 3 in accordance with BS 903-A16 at (100 2) C for (70 2) h shall show a volume increase of not more than 100 %. 8.8 Adhesion When tested in accordance with BS EN 28033, the load required to separate any layers shall be a minimum of 1.4 kN/m. 8.9 Ozon
29、e resistance When tested in accordance with method 1 of BS EN 27326:1993, no cracking shall be visible when the test specimen is examined under 2 magnification. 8.10 Neutral salt spray test (applies to hose assemblies only) When tested in accordance with BS 7479 for (96 2) h, the hose assembly shall
30、 show no base metal corrosion. 8.11 Flexure test (applies to hose assemblies only) When tested in accordance with Annex C the hose assembly shall not fail before one million flex cycles have been completed. 9 Marking Each length of hose shall be durably marked at intervals of not more than 250 mm wi
31、th the following information: a) manufacturers name or identification; b) number of this British Standard;2) c) type (A or B); d) nominal internal diameter; e) quarter and year of manufacture; f) description “Air brake”; g) batch reference number. Example: MR/BSAU110a/A/16/3Q95/AIR BRAKE/BBB 1) 1 ba
32、r = 100 kPa 2) Marking BS AU 110a:1995 on or in relation to a product represents a manufacturers 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
33、 a declaration is not to be confused with third party certification of conformity, which may also be desirable. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 110a:1995 BSI 07-19993 Annex A (normative) A
34、geing test A.1 Air oven (see BS 903-A19) The internal dimensions of the air oven shall not exceed (1 1 1.5) m. No copper or copper alloy shall be within the ageing chamber. Provision shall be made for suspending test pieces so that they are not within 1 cm of each other or of the sides of the oven.
35、There shall be a slow circulation of air through the oven of not less than three changes in one hour. The incoming air shall be heated to the temperature of the oven before coming into contact with the test pieces. Means shall be provided for controlling and measuring the rate of air flow. The tempe
36、rature of the oven shall be thermostatically controlled so that the test pieces are kept within 1 C of the relevant ageing temperature specified in A.2. A thermometer shall be placed amongst the test pieces to indicate the actual ageing temperature. A.2 Procedure Bend a length of hose around a forme
37、r of the dimensions specified in Table A.1 and hold in place by a band or cord (see Figure A.1). Place the assembly in the oven at the appropriate temperature shown below for a period of (70 2) h: type A 125 C type B 150 C After the ageing period take the assembly from the oven, allow it to cool to
38、room temperature and remove the hose from the former. Open out the hose to a straight length and cut lengthwise for examination. Annex B (normative) Leakage under pressure Connect the hose assembly, capped at one end, to a source of air pressure. Submerge the assembly in water, using any suitable co
39、ntainer for the water such that visual observation of the assembly is possible. Apply an internal air pressure of 15.5 bar to the hose, maintaining the air pressure for at least 5 min. Examine visually for leaks. Table A.1 Dimensions of hose test pieces and former Dimensions in millimetres Dimension
40、s of test specimenDimensions of former Nominal internal diameter of hose Length of hoseRadius R Height A Width B Thickness C 6.3 10.0 12.5 14.0 16.0 229 254 279 305 305 38 45 51 57 57 114 120 127 140 140 76 89 102 114 114 13 19 19 22 22 Figure A.1 Hose positioning for ageing test Licensed Copy: Lond
41、on South Bank University, London South Bank University, Sat Dec 09 02:08:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 110a:1995 4 BSI 07-1999 Annex C (normative) Flexure test C.1 Preparation of test pieces C.1.1 Prior to cutting the hose, apply a layline (of a colour distinguishable from that
42、 of the hose cover) along the length of the hose following the natural hose curvature which results from the hose being coiled in a roll (see Figure C.1). C.1.2 Cut the hose to provide a hose assembly test piece with a free hose length as shown in Table C.1. Free hose length is the outside exposed h
43、ose length between the fittings in the finished hose assembly. C.1.3 Assemble fittings to the hose in accordance with the manufacturers instructions. C.2 Preconditioning Subject each hose test piece assembly to the neutral salt spray test described in 8.10 followed by heat ageing in an oven at (100
44、1) C for (70 2) h with the hose assembly in a straight position. C.3 Installation of test pieces in the test set up After preconditioning, install the assembly as shown in Figure C.2 and proceed as follows, using configuration dimensions given in Table C.1. a) With the movable manifold, Y, of the fl
45、ex test machine at the centre of its stroke, connect fitting to the movable manifold in such a manner that the layline is located at the top-centre position (see Figure C.2). b) After fitting has been coupled with the movable manifold, connect the fitting to the stationary manifold, X, without impar
46、ting any twist to the hose, but allowing the hose to seek its natural curvature. C.4 Test procedure Flexure/pressure cycling test parameters shall be as follows: a) total flexure stroke (152 1.6) mm; b) flexure stroke frequency (100 5) cycles/min; c) ambient temperature in the range 21 C to 27 C; d)
47、 internal air pressure on test samples (10.3 0.1) bar. Flex the test pieces by moving fitting from the centre stroke position to 76 mm either side of centre (“A” dimension in Figure C.2) alternating between positions “1” and “2” while simultaneously cycling the air pressure on for 60 s and off for 6
48、0 s. The air pressure shall be alternately fully “on” for (60 5) s and fully “off” for (60 5) s. C.5 Failure point The failure point shall be determined by loss of air pressure through the failed test piece. As the air pressure is alternately fully “on” for 60 s and fully off for 60 s, pressure loss
49、 shall be further described as failure of the system to be repressurized to (10.3 0.7) bar through a diameter orifice within 120 s. 1.6 0.00 +0.03 mm () Figure C.1 Curved hose Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 110a:1995 BSI 07-19995 Table C.1 Dimensions for flexure test Figure C.2 Flexure test Dimensions in millimetres Nominal internal diameter Free hose leng
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