1、BS ISO8829-1:2009ICS 49.080; 83.140.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace Test methods forpolytetrafluoroethylene(PTFE) inner-tube hoseassembliesPart 1: Metallic (stainless steel) braidThis British Standardwas published under theauthority o
2、f the StandardsPolicy and StrategyCommittee on 31 May 2009 BSI 2009ISBN 978 0 580 55064 5Amendments/corrigenda issued since publicationDate CommentsBS ISO 8829-1:2009National forewordThis British Standard is the UK implementation of ISO 8829-1:2009.The UK participation in its preparation was entrust
3、ed to TechnicalCommittee ACE/69, Aerospace hydraulic systems, fluids andcomponents.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its co
4、rrect application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS ISO 8829-1:2009Reference numberISO 8829-1:2009(E)ISO 2009INTERNATIONAL STANDARD ISO8829-1First edition2009-04-01Aerospace Test methods for polytetrafluoroethylene (PTFE) inner-tube hose assemblies Pa
5、rt 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 8829-1:2009ISO 8829-1:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In a
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8、rinting. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 All rights reserved. Unless other
9、wise 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 country of the requester. ISO copyright
10、 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 8829-1:2009ISO 8829-1:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative
11、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 degradation test.7 5.2 Pneumatic effusion test
12、 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 Flexure test.14 5.12 Fuel resistance test
13、 .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 8829-1:2009ISO 8829-1:2009(E) iv ISO 2009 All rights reservedForeword
14、 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 technical
15、 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 elec
16、trotechnical 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 the
17、 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 systems and components. ISO 8829 cons
18、ists 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 8829-1:2009INTERNATIONAL STANDARD ISO 8829-1:2009(E) ISO 2009 All rights reserved 1Aer
19、ospace 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 steel) braided hose and hose assemblies use
20、d 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 specification. This part of ISO 8829 is applicabl
21、e 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 following referenced documents are indispensab
22、le 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 airborne equipment Resistance to fire in design
23、ated 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 applications Methods for the determination o
24、f 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 heat-retardant element over the hose ass
25、embly BS ISO 8829-1:2009ISO 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 density of the PTFE tubing shall be measured i
26、n 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 Test conditions Test specimens shall be c
27、onditioned 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 which has a suitable dynamometer and a dev
28、ice 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 accurate to within 10 %. If the dynamomet
29、er 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 accurately during the elongation of the tes
30、t 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 of 10 %. 4.2.3.2 Micrometer The micromete
31、r 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 0,15) N (0,18 0,034) lbf on a circular foot
32、 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 specimens narrower in width than the diameter o
33、f the foot unless the contact pressure is properly adjusted. 4.2.4 Calibration of testing machine The testing machine shall be calibrated. BS ISO 8829-1:2009ISO 8829-1:2009(E) ISO 2009 All rights reserved 3If the dynamometer is of the strain-gauge type, the test machine shall be calibrated at one or
34、 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 cutting edges with jewellers hard honing stones
35、. 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 is any tendency to break at or near the sam
36、e 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 Determination of tensile strength and elongation 4.
37、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 continuously the distance between the jaws, tak
38、ing 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, Rm, expressed in newtons per square millimetre1), using Equation (1): mFRS= (1) where F is the measured force, in newtons, requir
39、ed 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/mm2= 1 MPa. BS ISO 8829-1:2009ISO 8829-1:2009(E) 4 ISO 2009 All rights reservedCalculate the percentage total elongation at fracture, At, using Equation (
40、2): uoto100LLAL =(2) where Luis the length measured between the jaws at fracture of the test specimen; Lois the original length measured between the jaws before application of force. 4.3 Rolling and proof pressure tests 4.3.1 Principle This test is intended to check that there are no flaws in the si
41、ntered 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 inadvertent rotation in the tube. It is assumed that the tube is in
42、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. Roller angles shall be as specified in Table 1. A tolerance of 2 i
43、s 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 8829-1:2009ISO 8829-1:2009(E) ISO 2009 All rights reserved 5The roller gap dimensions
44、 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 (1 523 psi) hose Class D 21 000 kPa (3 046 psi) and higher hose Class
45、B 10 500 kPa (1 523 psi) hose Class D 21 000 kPa (3 046 psi) and higher hoseSize 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 (0,279) 5,5 (0,216) 6,4 (0,252)DN08 5 7,937 (0,312) 5,5 (0,216) 6,4 (
46、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 19,050 (0,750) 6,4 (0,252) 8,3 (0,327) 12,7 (0,500) 17,5 (0,689)DN25 16 25,
47、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 callout utilizes the lower hose size value noted. 4.3.3 Proof pressure test Proced
48、ure 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 Equivalent outside diameter of tube Class B 10 500 kPa (1 523 psi) hose Class D 21 000
49、 kPa (3 046 psi) and higher hose Size Size mm (in) kPa (psi) kPa (psi) DN05 3 4,762 (0,187) 2 690 (390) 2 690 (390) DN06 4 6,350 (0,250) 2 480 (360) 2 620 (380) DN08 5 7,937 (0,312) 2 000 (290) DN10 6 9,525 (0,375) 1 590 (230) 1 930 (280) DN12 8 12,700 (0,500) 1 240 (180) 1 520 (220) DN16 10 15,875 (0,625) 1 170 (170) 1 170 (170) DN20 12 19,050 (0,750) 965 (140) 890 (130) DN25 16 25,400 (1,000) 621 (90) 660 (95
