1、BS ISO 8829-1:2009 ICS 49.080; 83.140.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Aerospace Test methods for polytetrafluoroethylene (PTFE) inner-tube hose assemblies Part 1: Metallic (stainless steel) braidThis British Standard was published under the
2、authority of the Standards Policy and Strategy Committee on 31 May 2009 BSI 2009 ISBN 978 0 580 55064 5 Amendments/corrigenda issued since publication Date Comments BS ISO 8829-1:2009 National foreword This British Standard is the UK implementation of ISO 8829-1:2009. The UK participation in its pre
3、paration was entrusted to Technical Committee ACE/69, Aerospace hydraulic systems, fluids and components. 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
4、are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.BS ISO 8829-1:2009Reference number ISO 8829-1:2009(E) ISO 2009INTERNATIONAL STANDARD ISO 8829-1 First edition 2009-04-01 Aerospace Test methods for polytetrafluoroethylene (P
5、TFE) inner-tube hose assemblies Part 1: Metallic (stainless steel) braid Aronautique et espace Mthodes dessai des tuyauteries flexibles tube intrieur en polyttrafluorothylne (PTFE) Partie 1: Tresses mtalliques (en acier inoxydable) BS ISO 8829-1:2009 ISO 8829-1:2009(E) PDF disclaimer This PDF file m
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9、9 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 at the address below or ISOs member body in the coun
10、try 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 2009 All rights reservedBS ISO 8829-1:2009 ISO 8829-1:2009(E) ISO 2009 All rights reserved iii Contents Pa
11、ge Foreword iv 1 Scope 1 2 Normative references 1 3 Terms and definitions .1 4 Tests of PTFE inner tubes 2 4.1 Density and relative density .2 4.2 Tensile tests .2 4.3 Rolling and proof pressure tests .4 4.4 Electrical conductivity test .6 5 Tests on hoses and hose assemblies .7 5.1 Stress degradati
12、on test.7 5.2 Pneumatic effusion test 7 5.3 Electrical conductivity test .8 5.4 Visual and dimensional inspection10 5.5 Determination of elongation or contraction10 5.6 Volumetric expansion test11 5.7 Leakage test .12 5.8 Proof pressure test12 5.9 Burst pressure tests13 5.10 Impulse test13 5.11 Flex
13、ure test.14 5.12 Fuel resistance test .14 5.13 Low temperature flexure testing 15 5.14 Pneumatic leakage test .15 5.15 Vacuum test16 5.16 Pneumatic surge test 16 5.17 Thermal shock test 17 5.18 Fire test .17 Annex A (informative) Test fluids 18 Bibliography 19 BS ISO 8829-1:2009 ISO 8829-1:2009(E) i
14、v ISO 2009 All rights reservedForeword 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 interes
15、ted in a subject for which a technical 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 C
16、ommission (IEC) on all matters of electrotechnical 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 tech
17、nical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. ISO 8829-1 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid
18、 systems and components. ISO 8829 consists of the following parts, under the general title Aerospace Test methods for polytetrafluoroethylene (PTFE) inner-tube hose assemblies: Part 1: Metallic (stainless steel) braid Part 2: Non-metallic braid BS ISO 8829-1:2009 INTERNATIONAL STANDARD ISO 8829-1:20
19、09(E) ISO 2009 All rights reserved 1 Aerospace Test methods for polytetrafluoroethylene (PTFE) inner-tube hose assemblies Part 1: Metallic (stainless steel) braid 1 Scope This part of ISO 8829 specifies test methods for flexible polytetrafluoroethylene (PTFE) inner tubes with metallic (stainless ste
20、el) braided hose and hose assemblies used in aircraft fluid systems, in the pressure and temperature ranges covered by pressure classes and temperature types, as specified in ISO 6771. If performance requirements are not defined in this part of ISO 8829, they are defined in the performance specifica
21、tion. This part of ISO 8829 is applicable when reference is made to it in a procurement specification or other definition document. NOTE Fluids used for the tests are listed in Annex A. The requirements for non-metallic braid hose assemblies are given in ISO 8829-2. 2 Normative references The follow
22、ing 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 (including any amendments) applies. ISO 2685, Aircraft Environmental test procedure for airborn
23、e equipment Resistance to fire in designated fire zones ISO 6772, Aerospace Fluid systems Impulse testing of hydraulic hose, tubing and fitting assemblies ISO 6773, Aerospace Fluid systems Thermal shock testing of piping and fittings ISO 7258, Polytetrafluoroethylene (PTFE) tubing for aerospace appl
24、ications Methods for the determination of the density and relative density 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 room temperature temperature in the test laboratory between 15 C (59 F) and 32 C (90 F) 3.2 fire protection flame- and
25、heat-retardant element over the hose assembly BS ISO 8829-1:2009 ISO 8829-1:2009(E) 2 ISO 2009 All rights reserved4 Tests of PTFE inner tubes 4.1 Density and relative density 4.1.1 Principle This test is intended to control the crystallinity of PTFE inner tubes. 4.1.2 Test methods The relative densi
26、ty of the PTFE tubing shall be measured in accordance with ISO 7258, method A or method B. The density of the PTFE tubing shall be measured in accordance with ISO 7258, method C. 4.2 Tensile tests 4.2.1 Principle This test is intended to determine the mechanical properties of the PTFE tubing. 4.2.2
27、Test conditions Test specimens shall be conditioned for at least 2 h at room temperature prior to testing. 4.2.3 Apparatus 4.2.3.1 Testing machine The test shall be carried out using a power-driven machine which is capable of maintaining a uniform rate of jaw separation at 50 mm/min (2 in/min) and w
28、hich has a suitable dynamometer and a device for measuring the force applied within 2 %. If the capacity range cannot be changed during a test, as in the case of pendulum dynamometers, the force applied at breaking point shall be measured within 2 %, and the smallest tensile force measured shall be
29、accurate to within 10 %. If the dynamometer is of the compensating type for measuring tensile stress directly, means shall be provided to make adjustments for the cross-sectional area of the test specimen. The response of the recorder shall be sufficiently rapid that the force applied is measured ac
30、curately during the elongation of the test specimen to breaking point. If the test machine is not equipped with a recorder, a device shall be provided that indicates, after fracture, the maximum force applied during elongation. Testing machines shall be capable of measuring elongation in increments
31、of 10 %. 4.2.3.2 Micrometer The micrometer used for measuring flat test specimen thickness shall be capable of exerting a pressure of (25 5) kPa (3,63 0,7) psi on the test specimens and of measuring the thickness to within 0,025 mm (0,001 in). NOTE Dial micrometers exerting either a force of (0,8 0,
32、15) N (0,18 0,034) lbf on a circular foot 6,35 mm (0,25 in) in diameter, or a force of (0,2 0,04) N (0,045 0,009) lbf on a circular foot 3,2 mm (0,125 in) in diameter, conform to the pressure requirement specified above. It is not advisable to use a micrometer to measure the thickness of test specim
33、ens narrower in width than the diameter of the foot unless the contact pressure is properly adjusted. 4.2.4 Calibration of testing machine The testing machine shall be calibrated. BS ISO 8829-1:2009 ISO 8829-1:2009(E) ISO 2009 All rights reserved 3 If the dynamometer is of the strain-gauge type, the
34、 test machine shall be calibrated at one or more forces at regular intervals. 4.2.5 Test specimens The specimens shall be in accordance with Figure 1. NOTE Careful maintenance of the cutting edges of the die is extremely important and can be achieved by light daily honing and touching up of the cutt
35、ing edges with jewellers hard honing stones. The condition of the die can be assessed by determining the breaking point on any series of broken test specimens. When broken test specimens are removed from the jaws of the test machine, it is advantageous to pile these test specimens and note if there
36、is any tendency to break at or near the same portion of each test specimen. Breaking points consistently occurring at the same place can be an indication that the die is dull, nicked or bent at that particular position. Dimensions in millimetres Figure 1 Test specimen for tensile test 4.2.6 Determin
37、ation of tensile strength and elongation 4.2.6.1 Procedure Place the test specimens (see 4.2.5) in the jaws of the testing machine (see 4.2.3.1), taking care to adjust the specimen symmetrically so that the tension will be distributed uniformly over the cross-section. Start the machine and note cont
38、inuously the distance between the jaws, taking care to avoid parallax. At fracture, measure and record the elongation to the nearest 10 % on the scale. 4.2.6.2 Expression of results Calculate the tensile strength, R m , expressed in newtons per square millimetre 1 ) , using Equation (1): m F R S = (
39、1) where F is the measured force, in newtons, required to fracture the test specimens; S is the cross-sectional area, in square millimetres, of the test specimen before application of force. 1 ) 1 N/mm 2= 1 MPa. BS ISO 8829-1:2009 ISO 8829-1:2009(E) 4 ISO 2009 All rights reservedCalculate the percen
40、tage total elongation at fracture, A t , using Equation (2): uo t o 100 LL A L = (2) where L uis the length measured between the jaws at fracture of the test specimen; L ois the original length measured between the jaws before application of force. 4.3 Rolling and proof pressure tests 4.3.1 Principl
41、e This test is intended to check that there are no flaws in the sintered tube. 4.3.2 Rolling test Procedure Pass each tube, in a single pass, through six sets of metal rollers, so that it is subjected to the sequence of diametral flexings specified in Table 1. Rollers shall be arranged to prevent in
42、advertent rotation in the tube. It is assumed that the tube is in a horizontal position and that pressure of the first set of rollers is exerted vertically. Angles given for the final three sets of rollers may be taken as either clockwise or counter clockwise from the vertical diameter of the tube.
43、Roller angles shall be as specified in Table 1. A tolerance of 2 is allowed on each roller angle. Table 1 Roller functions and angles Set of metal rollers Type of action Roller angle 1 Flattening 0 2 Flattening 90 3 Rounding 0 4 Flattening 45 5 Flattening 135 6 Rounding 45 BS ISO 8829-1:2009 ISO 882
44、9-1:2009(E) ISO 2009 All rights reserved 5 The roller gap dimensions shall not be greater than those specified in Table 2 for each size. Table 2 Roller gap dimensions Hose size Maximum flattening gap Maximum rounding gap Metric part Inch part Equivalent outside diameter of tube Class B 10 500 kPa (1
45、 523 psi) hose Class D 21 000 kPa (3 046 psi) and higher hose Class B 10 500 kPa (1 523 psi) hose Class D 21 000 kPa (3 046 psi) and higher hose Size Size mm (in) mm (in) mm (in) mm (in) mm (in) DN05 3 4,762 (0,187) 5,2 (0,205) 5,2 (0,205) 5,5 (0,216) 6,4 (0,252) DN06 4 6,350 (0,250) 5,5 (0,216) 7,1
46、 (0,279) 5,5 (0,216) 6,4 (0,252) DN08 5 7,937 (0,312) 5,5 (0,216) 6,4 (0,252) DN10 6 9,525 (0,375) 5,5 (0,216) 7,1 (0,279) 7,9 (0,311) 8,3 (0,327) DN12 8 12,700 (0,500) 5,9 (0,232) 8,3 (0,327) 9,5 (0,374) 11,9 (0,468) DN16 10 15,875 (0,625) 6,4 (0,252) 8,3 (0,327) 12,7 (0,500) 14,7 (0,578) DN20 12 1
47、9,050 (0,750) 6,4 (0,252) 8,3 (0,327) 12,7 (0,500) 17,5 (0,689) DN25 16 25,400 (1,000) 6,4 (0,252) 8,3 (0,327) 19,1 (0,752) 21 (0,827) DN32 20 31,750 (1,250) 7,9 (0,311) 11,1 (0,437) 22,2 (0,874) 25,4 (1,000) DN40 24 38,100 (1,500) 9,5 (0,374) 31,8 NOTE Special size high pressure hose assembly callo
48、ut utilizes the lower hose size value noted. 4.3.3 Proof pressure test Procedure After the roll test, hold the tube for not less than 2 min at proof pressures as shown in Table 3, using water or air as the test medium. Table 3 Proof pressures Hose size Proof pressures Metric part Inch part Equivalen
49、t outside diameter of tube Class B 10 500 kPa (1 523 psi) hose Class D 21 000 kPa (3 046 psi) and higher hose Size Size mm (in) kPa (psi) kPa (psi) DN05 3 4,762 (0,187) 2690 (390) 2690 (390) DN06 4 6,350 (0,250) 2480 (360) 2620 (380) DN08 5 7,937 (0,312) 2000 (290) DN10 6 9,525 (0,375) 1590 (230) 1930 (280) DN12 8 12,700 (0,500) 1240 (180) 1520 (220) DN16 10 15,875 (0,625) 1170 (170) 1170 (170) DN20 1
