1、BRITISH STANDARD AEROSPACE SERIESBS ISO 23933:2006Aramid reinforced lightweightpolytetrafluoroethylene(PTFE) hose assemblies,classification 135 C/20 684 kPa (275 F/3 000 psi) and 135 C/21 000 kPa (275 F/3 046 psi) ProcurementspecificationICS 49.080g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55
2、g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS ISO 23933:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 16 March 2006 BSI 16 March 20
3、06ISBN 0 580 47952 8National forewordThis British Standard reproduces verbatim ISO 23933:2006 and implements it as the UK national standard.The UK participation in its preparation was entrusted to Technical Committee ACE/69, Aerospace hydraulic systems, fluids and components, which has the responsib
4、ility to: A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standa
5、rds Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard d
6、oes not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European develop
7、ments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 23 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since
8、 publicationAmd. No. Date CommentsReference numberISO 23933:2006(E)INTERNATIONALSTANDARDISO23933First edition2006-01-15Aerospace Aramid reinforced lightweight polytetrafluoroethylene (PTFE) hose assemblies, classification 135 C/20 684 kPa (275 F/3 000 psi) and 135 C/21 000 kPa (275 F/3 046 psi) Proc
9、urement specification Aronautique et espace Tuyauteries flexibles en polyttrafluorothylne (PTFE) renforcement aramide, srie lgre, classification 135 C/20 684 kPa (275 F/3 000 psi) et 135 C/21 000 kPa (275 F/3 046 psi) Spcification dapprovisionnement BS ISO 23933:2006iiiiiContents PageForeword iv 1 S
10、cope 12 Normative references 13 Classification24 Requirements.24.1 Limits of application24.2 Qualification .24.3 Materials .24.4 Construction.34.5 Inner tube requirements44.6 Hose assembly.54.7 Fitting threads64.8 Part numbering of interchangeable parts .74.9 Identification of products74.10 Workmans
11、hip .74.11 Hose assembly Test and performance requirements .8 5 Quality assurance125.1 Responsibility for inspection .125.2 Classification of inspections125.3 Qualification inspections 125.4 Quality conformance inspections155.5 Test conditions 165.6 Inspection methods.176 Preparation for delivery 18
12、6.1 Storage and packaging .186.2 Marking .187 Ordering data .18Annex A (informative) Equivalent materials 19 Annex B (informative) Qualification procedures and fire resistance specifications 21 Bibliography 22BS ISO 23933:2006ivForeword ISO (the International Organization for Standardization) is a w
13、orldwide 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 has been established has the right to be represented
14、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 electrotechnical standardization. International Standards are drafte
15、d 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 bodies for voting. Publication as an International Stand
16、ard 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 or all such patent rights. ISO 23933 was prepared by
17、 Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid systems and components.BS ISO 23933:20061Aerospace Aramid reinforced lightweight polytetrafluoroethylene (PTFE) hose assemblies, classification 135 C/20 684 kPa (275 F/3 000 psi) and 135 C/21 000 kPa (27
18、5 F/3 046 psi) Procurement specification 1 Scope This International Standard specifies requirements for aramid reinforced lightweight polytetrafluoroethylene (PTFE) hose assemblies for use in aircraft hydraulic, oil and fuel systems at temperatures between 55 C and 135 C ( 65 F and 275 F) and at a n
19、ominal pressure of 21 000 kPa (210 bar) (3 046 psi) or 20 684 kPa (3 000 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 of the PTFE liner may be tolerated. 2 Normativ
20、e references The following 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 2685:1998, Aircraft Environmenta
21、l test procedure for airborne equipment Resistance to fire in designated fire zonesISO 2859-1, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspectionISO 3161:1999, Aerospace UNJ threads General requirements and li
22、mit dimensionsISO 5855-3:1990, Aerospace MJ threads Part 3: Limit dimensions for fittings for fluid systemsISO 6772:1988, Aerospace Fluid systems Impulse testing of hydraulic hose, tubing and fitting assembliesISO 7258:1984, Polytetrafluoroethylene (PTFE) tubing for aerospace applications Methods fo
23、r the determination of the density and relative densityISO 8829-2, Aerospace Test methods for polytetrafluoroethylene (PTFE) innertube hose assemblies Part 2: Non-metallic braid SAE AS 150, Hose assembly, type classifications of, basic performance and fire resistanceSAE AS 1055, Fire testing of flex
24、ible hose, tube assemblies, coils, fittings and similar system componentsSAE AS 1241, Fire resistant phosphate ester hydraulic fluid for aircraft BS ISO 23933:200623 Classification Hose assemblies furnished under this International Standard shall be classified as follows: Type A: 20 684 kPa (3 000 p
25、si) nominal pressure; Type B: 21 000 kPa (210 bar) (3 046 psi) nominal pressure. When no classification is specified by reference to this standard, type B shall apply. 4 Requirements 4.1 Limits of application The use of these hose assemblies in high-pressure pneumatic storage systems is not recommen
26、ded. 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, shall be subject to the approval of the purchaser. 4.2 Qualification 4.2.1 General
27、 Hose assemblies supplied in accordance with this 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. 4.2.2 Manufacturer qualification Manufacturer approval sha
28、ll be granted by outside agency procedure (see Table B.1, Procedure no. 1). 4.2.3 Product qualification Product approval shall be granted by outside agency procedure (see Table B.1, Procedure no. 2). 4.3 Materials 4.3.1 General The hose assembly materials shall be as described in this International
29、Standard. All materials not specifically described in this International Standard shall be of the highest quality and suitable for the purpose intended. 4.3.2 Metals Metals used in the fittings shall conform to the applicable specifications described in Table 1 (or equivalent specifications; see Ann
30、ex A). Welded and redrawn tubing shall not be used. Material no. 1 shall not be used for welded assemblies. BS ISO 23933:20063Table 1 Metals to be used in hose assemblies Form Metal Material no. (see Annex A)Austenitic, annealed or as-rolled, corrosion-resistant steel 1 Austenitic, annealed or as-ro
31、lled, stabilized, corrosion-resistant steel 2 and 3 Precipitation-hardening, corrosion-resistant steel 4, 5 and 6 Bars and forgings Titanium 6Al-4V 7CPTi 8Austenitic, seamless or welded, annealed, corrosion-resistant steel 9 Austenitic, seamless or welded, stabilized, corrosion-resistant steel 10 an
32、d 11 Tubing Cold-worked, stress-relieved titanium alloy 12 4.4 Construction 4.4.1 General To meet the construction and performance requirements laid down in this International Standard and as required for its intended use, the hose assembly shall consist of: a seamless PTFE inner tube (see 4.4.2); t
33、reated para-aramid reinforcement (see 4.4.3); outer cover or braid protection to meet qualification and usability requirements; corrosion-resistant steel and/or titanium end-fittings (see 4.4.4). 4.4.2 Inner tube The inner tube shall be of a seamless construction of virgin PTFE resin of uniform gaug
34、e. It shall have a smooth bore and shall be free from pitting or projections on the inner surface. Additives may be included in the compound from which the tube is extruded with no more than 3 % of such additives being retained in the mixture. 4.4.3 Reinforcement The reinforcement shall consist of a
35、 treated para-aramid braid and an outer braid or other coverage to protect the para-aramid. The reinforcement shall be arranged on the outside surface of the inner tube so as to provide sufficient strength to ensure compliance with the requirements laid down in this International Standard. Broken, d
36、amaged, slack or missing reinforcement yarn shall be cause for rejection. The outer cover, or braid, shall provide 100 % coverage to protect the para-aramid reinforcement from exposure to ultraviolet light when bending to minimum radius specified in Table 4. A continuous lay line which can be interr
37、upted with hose manufacturers name or trademark, shall be permanently marked in contrasting colour along the hose length. BS ISO 23933:200644.4.4 Fittings 4.4.4.1 General It shall be proven that all fittings comply with the requirements laid down in this International Standard. Hose assemblies suppl
38、ied under this International Standard shall be equipped with fittings qualified for their intended use. 4.4.4.2 Insert fittings Insert fittings shall be manufactured in one piece wherever possible. Those made of other than one-piece construction shall be butt-welded, fabricated unless otherwise agre
39、ed by the purchaser, from corrosion-resistant steel or titanium tubing. 4.5 Inner tube requirements 4.5.1 Density and relative density The relative density of the hose inner tube shall not exceed 2,155 g/cm3, when tested in accordance with ISO 7258, either method A or method B (as specified in ISO 8
40、829-2). The density shall not exceed 2,204 g/cm3, when tested in accordance with ISO 7258, method C (as specified in ISO 8829-2). 4.5.2 Tensile strength When tested in accordance with ISO 8829-2, 4.2, the longitudinal tensile strength for all sizes of tubes shall be at least 15,1 N/mm2(1 N/mm2= 1 MP
41、a) (2 200 psi). When tested in accordance with ISO 8829-2, 4.2, the transverse tensile strength for sizes DN 16 ( 10) and larger shall be at least 12,4 N/mm2(1 800 psi); for sizes under DN 16 ( 10), the transverse strength need not be tested. 4.5.3 Elongation When tested in accordance with ISO 8829-
42、2, 4.2, elongation shall be at least 200 %. 4.5.4 Tube roll The tube shall not leak, split, burst or show any signs of malfunction, when tested through the sequence as specified in 4.3.2 of ISO 8829-2. 4.5.5 Tube proof pressure After being subjected to the tube roll test sequence (see 4.5.4), the tu
43、be, without reinforcing yarns, shall not leak, burst or show any signs of malfunction, when tested as specified in 4.3.3 of ISO 8829-2. 4.5.6 Electrical conductivity When tested in accordance with 4.4 of ISO 8829-2, the electrical current shall be equal to or greater than: 10 A for sizes DN 06 to DN
44、 12 inclusive (04 to 08 inclusive); 20 A for sizes DN 16 (10) and over. BS ISO 23933:200654.6 Hose assembly 4.6.1 Dimensional requirements The hose assembly dimensions, except for length, shall be as specified in Figure 1 and Table 2A or Table 2B, as useful. 4.6.2 Physical requirements The hose asse
45、mbly shall comply with the physical and linear density (weight) requirements specified in Table 4. Key awidth across corners of nut and socket hexagon dhinside diameter (hose) Dhoutside diameter (hose) dfinside diameter (fitting) Dfoutside diameter (fitting) l attachment length G wall thickness of i
46、nner tube Figure 1 Hose and fitting dimensions 4.6.3 Bore check When bent to appropriate minimum bend radius as specified in Table 4, the hose assembly shall permit the free passage of a solid rigid sphere throughout its length. The minimum diameter of the sphere is given in Table 2A or Table 2B, as
47、 useful. 4.6.4 Assembly length Tolerances on hose assembly lengths shall be as follows (unless otherwise specified): r 3,20 mm (r 0,125 in) for lengths under 500 mm (19,6 in); r 6,35 mm (r 0,250 in) for lengths from 500 mm to 1 000 mm (19,6 in to 39,4 in) exclusive; r 12,70 mm (r 0,500 in) for lengt
48、hs from 1 000 mm to 1 500 mm (39,4 in to 59 in) exclusive; r 1 % for lengths of 1 500 mm (59 in) and over. BS ISO 23933:200664.7 Fitting threads Unless otherwise specified (see 4.4.4), fitting threads shall be in accordance with ISO 5855-3 for SI (metric series) fittings and ISO 3161 for imperial (i
49、nch series) fittings. A 10 % increase in the tolerance of the fitting thread of the nut following proof pressure test shall not be cause for rejection of the hose assembly. Table 2A Hose and fitting dimensions as shown in Figure 1 SI units Dimensions in millimetres Hose size (nom.)Inch part Hose (braided) Fitting Sphericalball size for hose assemblyinside diameterbMetric part Equivalent tube outside diameter Inside diameter dhOutside diameter DhInsi
