1、 Reference number ISO 8913:2006(E) ISO 2006INTERNATIONAL STANDARD ISO 8913 Third edition 2006-11-01 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 Aronautique et
2、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 dapprovisionnement ISO 8913:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes lice
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5、en 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. ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may be repr
6、oduced 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 office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22
7、749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reservedISO 8913:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Classification. 2 4 Requirements 2 4.1 Q
8、ualification 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 parts 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 f
9、or inspection 13 5.2 Classification of inspections . 13 5.3 Qualification inspections . 13 5.4 Quality conformance inspections . 15 5.5 Test conditions . 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)
10、Equivalent hose assembly product standards governed by ISO 8913 20 Annex B (normative) Equivalent national qualification procedure and fire resistance specification. 21 Annex C (informative) Equivalent materials 22 Bibliography . 25 ISO 8913:2006(E) iv ISO 2006 All rights reservedForeword ISO (the I
11、nternational 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 committee
12、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 electrotechnica
13、l 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 member bod
14、ies 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 some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any
15、 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. This third edition cancels and replaces the second edition (ISO 8913:1994). Criteria for imperial dimension (inch-based) hose a
16、ssemblies as used for commercial aviation are being introduced. ISO 8913:2006(E) ISO 2006 All rights reserved v Introduction This International Standard establishes the basic performance and quality requirements for lightweight polytetrafluoroethylene (PTFE) hose assemblies for use in aerospace flui
17、d 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 the original qualification testing. Compliance with these test and procurement requirements is neces
18、sary for hose assemblies that are used in fluid systems where a malfunction would affect the safety of flight. INTERNATIONAL STANDARD ISO 8913:2006(E) ISO 2006 All rights reserved 1 Aerospace Lightweight polytetrafluoroethylene (PTFE) hose assemblies, classification 400 F/3 000 psi (204 C/20 684 kPa
19、) 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 between 55 C and 204 C ( 65 F and 400 F), and at a nomina
20、l 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 PTFE liner may be tolerated. The use of these hose
21、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 International Standard, for example for oxygen, are subject
22、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 document. For dated references, only the edition cited appl
23、ies. 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, Sampling procedures for inspection by attributes Par
24、t 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 fluid systems ISO 6772:1988, Aerospace Fluid system
25、s 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 Polytetrafluoroethylene (PTFE) hose assemblies Test methods IS
26、O 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 quality assurance in design, development, production, ins
27、tallation and servicing (based on ISO 9001:1994) ISO 8913:2006(E) 2 ISO 2006 All rights reservedEN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts SAE AS150, Hose assembly, type classifications of, basic performance and fire resistance SAE AS105
28、5, 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, Standard practices for de
29、tecting 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 follows: Type A 3 000 p
30、si (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 International Standard
31、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 specified in Table B.1, proc
32、edure 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, Table C.1). All materi
33、als not specifically described in this International Standard shall be of the highest quality and suitable for the purpose intended. ISO 8913:2006(E) ISO 2006 All rights reserved 3 4.2.2 Metals Metals used in the hose and fittings shall be corrosion-resistant steel, nickel alloy or titanium, and sha
34、ll conform 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
35、, nickel 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
36、; it shall 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 c
37、orrosion-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 shal
38、l be cause 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
39、shall 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 Anne
40、x C) may be used. ISO 8913:2006(E) 4 ISO 2006 All rights reservedTable 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 Precipita
41、tion-hardening, corrosion-resistant 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-pres
42、sure, corrosion-resistant steel 14 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
43、, fabricated from type 304 stainless 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 a
44、cceptable without being subjected to 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 3
45、when tested in accordance with ISO 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 str
46、ength for sizes DN16 ( 10) and larger 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, s
47、plit, burst or show any signs of malfunction, 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
48、, when tested as specified in ISO 8829:1990, 4.3.3. ISO 8913:2006(E) ISO 2006 All rights reserved 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
49、 for sizes DN16 ( 10) and over. 4.5 Hose 4.5.1 Dimensional requirements 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 Inside diameter Outside diameter Inside diameter Outside diameter bSpherical ball
