1、BRITISH STANDARD BS ISO 8913:2006 Aerospace Lightweight polytetrafluoroethylene (PTFE) hose assemblies, classification 400 F/3 000 psi (204 C/20 684 kPa) and 204 C/21 000 kPa (400 F/3 046 psi) Procurement specification ICS 49.080; 83.140.40 BS ISO 8913:2006 This British Standard was published under
2、the authority of the Standards Policy and Strategy Committee on 31 January 2007 BSI 2007 ISBN 978 0 580 49958 6 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 8913:2006. The UK participation in its preparation was entrusted to Technical Committee ACE
3、/69, Aerospace hydraulic systems, fluids and components. A list of organizations represented on ACE/69 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 w
4、ith a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. Date Comments Reference number ISO 8913:2006(E)INTERNATIONAL STANDARD ISO 8913 Third edition 2006-11-01 Aerospace Lightweight polytetrafluoroethylene (PTFE) hose assemblies, classificat
5、ion 400 F/3 000 psi (204 C/20 684 kPa) and 204 C/21 000 kPa (400 F/3 046 psi) Procurement specification Aronautique et espace Tuyauteries flexibles en polyttrafluorothylne (PTFE), srie lgre, classification 400 F/3 000 psi (204 C/20 684 kPa) et 204 C/21 000 kPa (400 F/3 046 psi) Spcification dapprovi
6、sionnement BS ISO 8913:2006ii iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Classification. 2 4 Requirements 2 4.1 Qualification 2 4.2 Materials 2 4.3 Construction 3 4.4 Inner tube. 4 4.5 Hose . 5 4.6 Screw threads . 7 4.7 Part numbering of interchangeable par
7、ts 7 4.8 Identification of products. 7 4.9 Workmanship 8 4.10 Hose assembly Test and performance requirements 8 5 Quality assurance. 13 5.1 Responsibility for inspection 13 5.2 Classification of inspections . 13 5.3 Qualification inspections . 13 5.4 Quality conformance inspections . 15 5.5 Test con
8、ditions . 17 5.6 Inspection methods 18 6 Preparation for delivery . 18 6.1 Storage and packaging 18 6.2 Marking 18 7 Ordering data 18 Annex A (informative) Equivalent hose assembly product standards governed by ISO 8913 20 Annex B (normative) Equivalent national qualification procedure and fire resi
9、stance specification. 21 Annex C (informative) Equivalent materials 22 Bibliography . 25 BS ISO 8913:2006iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is n
10、ormally carried out through ISO technical committees. Each member body interested 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 i
11、n the work. ISO collaborates closely with the International Electrotechnical Commission (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 prep
12、are International Standards. Draft International Standards adopted by the technical 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. Attention is drawn to the possibility that s
13、ome of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8913 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid systems and components.
14、This third edition cancels and replaces the second edition (ISO 8913:1994). Criteria for imperial dimension (inch-based) hose assemblies as used for commercial aviation are being introduced. BS ISO 8913:2006 v Introduction This International Standard establishes the basic performance and quality req
15、uirements for lightweight polytetrafluoroethylene (PTFE) hose assemblies for use in aerospace fluid systems. The procurement requirements are intended to ensure that hose assemblies which are procured in accordance with this specification are of the same quality as the hose assemblies used during th
16、e original qualification testing. Compliance with these test and procurement requirements is necessary for hose assemblies that are used in fluid systems where a malfunction would affect the safety of flight. BS ISO 8913:2006 blank 1 Aerospace Lightweight polytetrafluoroethylene (PTFE) hose assembli
17、es, classification 400 F/3 000 psi (204 C/20 684 kPa) and 204 C/21 000 kPa (400 F/3 046 psi) Procurement specification 1 Scope This International Standard specifies requirements for lightweight polytetrafluoroethylene (PTFE) hose assemblies for use in aircraft hydraulic systems at temperatures betwe
18、en 55 C and 204 C ( 65 F and 400 F), and at a nominal pressure up to 3 000 psi (20 684 kPa) or 21 000 kPa (3 046 psi). The hose assemblies are also suitable for use within the same temperature and pressure limitations in aircraft pneumatic systems where some gaseous diffusion through the wall on the
19、 PTFE liner may be tolerated. The use of these hose assemblies in high-pressure pneumatic storage systems is not recommended. In addition, installations in which the limits specified in this International Standard are exceeded, or in which the application is not covered specifically by this Internat
20、ional Standard, for example for oxygen, are subject to the approval of the purchaser. Annex A is a listing of hose assembly procurement standards conforming to this International Standard. 2 Normative references The following referenced documents are indispensable for the application of this documen
21、t. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2685:1998, Aircraft Environmental test procedure for airborne equipment Resistance to fire in designated fire zones ISO 2859-1:1999,
22、Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection ISO 3161:1999, Aerospace UNJ threads General requirements and limit dimensions ISO 5855-3:1999, Aerospace MJ threads Part 3: Limit dimensions for fittings for
23、 fluid systems ISO 6772:1988, Aerospace Fluid systems Impulse testing of hydraulic hose, tubing and fitting assemblies ISO 7258:1984, Polytetrafluoroethylene (PTFE) tubing for aerospace applications Methods for the determination of the density and relative density ISO 8829:1990, Aerospace Polytetraf
24、luoroethylene (PTFE) hose assemblies Test methods ISO 8829-2, Aerospace Test methods for polytetrafluoroethylene (PTFE) inner-tube hose assemblies Part 2: Non-metallic braid EN 9100, Aerospace series Quality management systems Requirements (based on ISO 9001:2000) and Quality systems Model for quali
25、ty assurance in design, development, production, installation and servicing (based on ISO 9001:1994) BS ISO 8913:20062 EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts SAE AS150, Hose assembly, type classifications of, basic performance and fi
26、re resistance SAE AS1055, Fire testing of flexible hose, tube assemblies, coils, fittings and similar system components SAE AS7003, Nadcap program requirements SAE AS7112, National aerospace and defense contractors accreditation program (Nadcap) requirements for fluid system components ASTM A262, St
27、andard practices for detecting susceptibility to intergranular attack in austenitic stainless steels PRI PD2101, Aerospace quality assurance, product standards, qualification procedure, fluid systems 3 Classification Hose assemblies furnished under this International Standard shall be classified as
28、follows: Type A 3 000 psi (20 684 kPa) pressure system, Type B 21 000 kPa (3 046 psi) pressure system. When no classification is specified by reference to this International Standard, type B shall apply. 4 Requirements 4.1 Qualification 4.1.1 General Hose assemblies supplied in accordance with this
29、International Standard shall be representative of products which have been subjected to and which have successfully passed the requirements and tests specified in this International Standard. 4.1.2 Manufacturer qualification Manufacturer approval shall be granted by outside agency procedure as speci
30、fied in Table B.1, procedure no. 1). 4.1.3 Product qualification Product approval shall be granted by outside agency procedure as specified in Table B.1, procedure no. 2. 4.2 Materials 4.2.1 General The hose assembly materials shall be as described in this International Standard (see, in particular,
31、 Table C.1). All materials not specifically described in this International Standard shall be of the highest quality and suitable for the purpose intended. BS ISO 8913:2006 3 4.2.2 Metals Metals used in the hose and fittings shall be corrosion-resistant steel, nickel alloy or titanium, and shall con
32、form to the applicable specifications given in Table 1 (or equivalent specifications; see Annex C). 4.3 Construction 4.3.1 General The hose assembly shall consist of: a seamless PTFE inner tube (see 4.3.2), corrosion-resistant steel wire reinforcement (see 4.3.3), and corrosion-resistant steel, nick
33、el alloy and/or titanium end fittings (see 4.3.4), as required to meet the construction and performance requirements laid down in this International Standard and as required for its intended use. 4.3.2 Inner tube The inner tube shall be of a seamless construction of PTFE resin of uniform gauge; it s
34、hall have a smooth bore and shall be free from pitting and projections on the inner surface. Additives may be included in the compound from which the tube is extruded with no more than 2 % of such additives being retained in the mixture. 4.3.3 Reinforcement The reinforcement shall consist of corrosi
35、on-resistant steel wire conforming to the applicable specifications given in 4.2.2. The wires shall be arranged over the inner tube so as to provide sufficient strength to ensure compliance with the requirements laid down in this International Standard. Broken or missing reinforcing wires shall be c
36、ause for rejection; crossed-over reinforcing wires shall not be cause for rejection of the flexible hose assembly. 4.3.4 Fittings 4.3.4.1 General It shall be proven that all fittings comply with the requirements laid down in this International Standard. 4.3.4.2 Insert fittings Insert fittings shall
37、be manufactured in one piece wherever possible; those made of other than one-piece construction shall be butt-welded, fabricated unless otherwise agreed by the purchaser, from corrosion- resistant steel or nickel alloy tubing, or titanium. Welded and redrawn tubing (materials 8 and 9; see Annex C) m
38、ay be used. BS ISO 8913:20064 Table 1 Metals to be used in hose assemblies Form Metal Material no. (see Annex C) Austenitic, annealed or as-rolled, corrosion-resistant steel 1 Austenitic, annealed or as-rolled, stabilized, corrosion-resistant steel 2 to 4 Precipitation-hardening, corrosion-resistant
39、 steel 5 to 8 Titanium 6Al-4V 9 Bars and forgings Nickel alloy type 625 10 Austenitic, seamless or welded, annealed, corrosion-resistant steel 11 Austenitic, seamless or welded, stabilized, corrosion-resistant steel 12 and 13 Austenitic, welded and drawn, high-pressure, corrosion-resistant steel 14
40、Cold-worked, stress-relieved, titanium alloy 15 Tubing Nickel alloy, type 625, seamless or welded, annealed 16 Wire Austenitic, cold-drawn, corrosion-resistant steel 17 to 20 4.3.4.3 End fitting collars (sockets) All end fitting collars (sockets), crimped or swaged, fabricated from type 304 stainles
41、s steel, shall be capable of passing an embrittlement test as specified in ASTM A262, practice E, prior to assembly to the fitting and subsequent crimp or swaging operation. Collars (sockets) fabricated from stabilized austenitic steel (Type 304L, 321 or 347) are acceptable without being subjected t
42、o the embrittlement test. 4.4 Inner tube 4.4.1 Density and relative density The density of the hose inner tube shall not exceed 2,155 g/cm 3when tested in accordance with ISO 7258:1984, either method A or method B. The relative density shall not exceed 2,204 g/cm 3when tested in accordance with ISO
43、7258:1984, method C. 4.4.2 Tensile strength When tested in accordance with ISO 8829:1990, 4.2, the longitudinal tensile strength for all tube sizes shall be at least 15,1 MPa (2 200 psi). When tested in accordance with ISO 8829:1990, 4.2, the transverse tensile strength for sizes DN16 ( 10) and larg
44、er shall be at least 12,4 MPa (1 800 psi); for sizes under DN16 ( 10), the transverse strength need not be tested. 4.4.3 Elongation When tested in accordance with ISO 8829:1990, 4.2, the elongation shall be at least 200 %. 4.4.4 Tube roll The tube shall not leak, split, burst or show any signs of ma
45、lfunction, when tested through the sequence as specified in ISO 8829:1990, 4.3.2. 4.4.5 Tube proof pressure After being subjected to the tube roll test sequence (see 4.4.4), the tube, without reinforcing wires, shall not leak, burst or show any signs of malfunction, when tested as specified in ISO 8
46、829:1990, 4.3.3. BS ISO 8913:2006 5 4.4.6 Electrical conductivity When tested in accordance with ISO 8829:1990, 4.4, the electrical current shall be equal to or greater than a) 6 A for sizes DN06 to DN12 (inclusive) ( 04 to 08); b) 12 A for sizes DN16 ( 10) and over. 4.5 Hose 4.5.1 Dimensional requi
47、rements The hose assembly dimensions, except for length, shall be as specified in Figure 1 and Table 2A or 2B. aSee footnote b to Table 2a or 2b. Figure 1 Hose and fitting dimensions Table 2a Hose and fitting dimensions as shown in Figure 1 Imperial units Dimensions in inches Hose (braided) Fitting
48、Inside diameter Outside diameter Inside diameter Outside diameter bSpherical ball size for hose assembly inside diameter aHose size d hD hd fD fAttachment length l Wall thickness of inner tube (nom.) min. min. max. min. max. max. min. max. Straight fittings Elbow fittings 04 0,212 0,360 0,390 0,135
49、0,690 0,98 0,035 0,046 0,122 0,115 06 0,298 0,455 0,490 0,240 0,800 1,09 0,035 0,046 0,216 0,204 08 0,391 0,585 0,615 0,340 0,970 1,33 0,040 0,051 0,306 0,289 10 0,485 0,690 0,730 0,410 1,100 1,36 0,045 0,056 0,369 0,349 12 0,602 0,950 0,990 0,508 1,380 1,40 0,045 0,056 0,459 0,434 16 0,852 1,230 1,270 0,760 1,660 1,60 0,045 0,056 0,684 0,646 aMinimum specified inside diameter shall
