1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS4897 AEROSPACESTANDARDAS4897 Issued 1994-07 Reaffirmed 2015-07 Hose Assembly, P
5、olytetrafluoroethylene (PTFE), Low Pressure, 450 F and Fireproof, Procurement Specification for RATIONALE AS4897 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE:1.1 Application:This SAE Aerospace Standard (AS) covers the requirements for polytetrafluoroethylene (PTFE) ho
6、se assemblies for use in aerospace fuel and lubricating oil systems at temperatures between -67 and 450 F and at operating pressures per Table 1. The hose assemblies are also suitable for use within the same temperature and pressure limitations in aerospace pneumatic systems where some gaseous diffu
7、sion through the wall of the PTFE liner can be tolerated.The use of these hose assemblies in pneumatic storage systems is not recommended. In addition, installations in which the limits specified herein are exceeded, or in which the application is not covered specifically by this document, for examp
8、le oxygen, shall be subject to the approval of the purchaser.SAE INTERNATIONAL AS4897 Page 2 of 18 TABLE 1 - Physical Requirements of Hose Assemblies2. APPLICABLE DOCUMENTS:The following publications form a part of this specification to the extent specified herein. The applicable issue of other docu
9、ments shall be the issue in effect on the date of the purchase order.2.1 SAE Publications:Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 4928 Titanium Alloy Bars and Forgings, 6Al4V, Annealed, 120,000 psi (827 MPa) YieldAMS 4945 Titanium Alloy Tubing, Seamless, Hydraulic,
10、3Al-2.5V, Texture Controlled, 105,000 psi (724 MPa) Yield StrengthAMS 4965 Bars, Forgings and Rings 6Al4V, Solution and Precipitation Heat TreatedAMS 5637 Bars, 18Cr 9Ni, Solution Heat Treated and Cold Drawn - 125,000 psiAMS 5639 Steel Bars, Forgings, Tubing, and Rings, Corrosion-Resistant 19 Cr - 1
11、0 Ni (SAE 30304)AMS 5643 Steel Bars, Forgings, Tubing, and Rings, Corrosion Resistant 16.5 Cr - 4.0 Ni - 4.0 CuAMS 5644 Steel, Bars, and Forgings, Corrosion and Heat Resistant 17 Cr - 7 Ni - 1 AlAMS 5645 Steel Bars, Forgings, Tubing, and Rings, Corrosion and Heat Resistant 18 Cr - 10 Ni - 0.40 Ti (S
12、AE 30321)AMS 5646 Steel Bars, Forgings, Tubing, and Rings, Corrosion and Heat Resistant 18 Cr - 11 Ni - 0.60 (Cb + Ta) (SAE 30347)AMS 5647 Bars, Forgings, Tubing and Rings 19 Cr 9.5 Ni, Solution Heat TreatedAMS 5659 Bars, Wire, Forgings, Rings and Extrusions, 15 Cr 4.5 Ni 0.30 (Cb + Ta) 3.5 Cu, Cons
13、umable Electrode Melted, Solution Heat Treated, Precipitation HardenableAMS 5685 Wire, Safety, 18 Cr 11.5 Ni, Solution Heat Treated, Cold Finished (SAE30305)SAE INTERNATIONAL AS4897 Page 3 of 18 2.1 (Continued):AMS 5689 Wire, Corrosion and Heat Resistant 18 Cr - 9.5 Ni - Ti (SAE 30321) Solution Heat
14、 TreatedAMS 5690 Wire, Corrosion and Heat-Resistant 17 Cr - 12 Ni - 2.5 Mo (SAE 30316)AMS 5697 Wire, Corrosion Resistant 19 Cr - 9.5 Ni (SAE 30304)AMS 5743 Bars and Forgings 15.5 Cr - 4.5 Ni - 2.9 Mo - 0.10 N, Solution Heat-treated, Sub-Zero Cooled, Equalized, and Over TemperedAS150 Hose Assembly, T
15、ype Classifications of, Basic Performance and Fire ResistanceARP603 Impulse Testing of Hydraulic Hose Assemblies, Tubing and FittingsAS611 Tetrafluoroethylene Hose Assembly Cleaning MethodsARP908 Hose Fittings Installation and Qualification Test, Torque RequirementsAS1055 Fire Testing of Flexible Ho
16、se, Tube Assemblies, Coils, Fittings and Similar System ComponentsARP1153 Methods for Determining Relative Specific GravityAS1708 Fitting End, Flared, Female, Standard Dimensions forARP1835 Preparation for Delivery, General Requirements for Hose AssembliesAS1946 Hose Assembly, Polytetrafluoroethylen
17、e (PTFE), Up to 450 F (232 C) and 1500 psi (10 500 kPa), Procurement SpecificationAS2078 Aerospace - Fluid Systems - Test Methods for Polytetrafluoroethylene (PTFE) Hose AssembliesAS4375 Fitting End, External Thread, Flareless, Design StandardAS4395 Fitting End - Flared Tube Connection, Design Stand
18、ard2.2 U.S. Government Publications:Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia PA 19111-5094.P-D-680 Dry Cleaning and Degreasing SolventQQ-S-763 Steel Bars, Wire Shapes, and Forgings, Corrosion-ResistingQQ-P-35 Passivation Treatments for Corrosio
19、n Resistant SteelMIL-T-31000 Drawings, Engineering and Associated ListsMIL-STD-130 Identification Marking of U.S. Military PropertyMIL-STD-831 Test Reports: Preparation ofMIL-C-5501 Caps and Plugs, Protective, Dust and Moisture Seal, General Specification forMIL-H-25579 Hose Assembly, Tetrafluoroeth
20、ylene, High Temperature, Medium PressureMIL-S-8879 Screw Threads, Controlled Radius Root, With Increased Minor Diameter, General Specification forMIL-T-8504 Tubing Steel, Corrosion-Resisting (304) Aerospace Vehicle Hydraulic Systems, Annealed, Seamless and WeldedMIL-T-8808 Tubing, Steel, Corrosion-R
21、esistant (18-8 Stabilized), Aircraft Hydraulic Quality (Composition 321 and 347)MS33514 Fitting End, Standard Dimensions for Flareless Tube Connection and Gasket Seal (See AS4375)MS33656 Fitting End, Standard Dimensions for Flared Tube Connection and Gasket Seal (Cancelled - See AS4395)SAE INTERNATI
22、ONAL AS4897 Page 4 of 18 2.3 ASTM Publications:Available from ASTM, 1916 Race St., Philadelphia, PA 19103-1187.ASTM A 262 Standard Recommended Practices for Detecting Susceptibility to Intergranular Attack in Stainless SteelASTM A 580 Specification for Stainless and Heat Resisting Steel WireASTM D 7
23、92 Tests for Specific Gravity and Density of Plastics by Displacement2.4 AIA National Aerospace Standards:Available from Aerospace Industries Association, 1250 Eye Street NW, Washington, DC 20005.NAS 1760 Fitting End, Flareless Acorn, Standard Dimensions for2.5 ASME Publications:Available from ASME,
24、 345 E. 47th St., New York, NY 10017.ANSI/ASME B46.1 Surface Texture3. REQUIREMENTS:3.1 Qualification:Hose assemblies supplied in accordance with this standard shall be representative of products which have been subjected to and which have successfully passed the material and qualification tests spe
25、cified in this standard. They shall be listed on or approved for listing on an applicable qualified products list. Users/purchasers are encouraged to establish a qualified product/manufacturers list.3.2 Materials:The hose assemblies shall be uniform in quality and free from defects in material as is
26、 consistent with good manufacturing practice, and shall conform with the applicable specifications and requirements specified in this document. All materials not specifically described herein shall be of the highest quality and suitable for the purposes intended.SAE INTERNATIONAL AS4897 Page 5 of 18
27、 3.2.1 Metals: Metals used in the hose shall be corrosion-resistant steel, and fittings shall be corrosion-resistant steel or titanium suitably treated to resist corrosion when in storage or during normal service use. All end fitting sockets (collars) crimped or swaged, fabricated from type 304 stai
28、nless steel, are required to be capable of passing an embrittlement test as specified in ASTM A 262, practice E, prior to assembly to the nipple by a crimping/swaging operation. Sockets fabricated from stabilized austenitic steel are acceptable without being subjected to the embrittlement test. Meta
29、ls used in the hose and fittings shall be as listed below:a. Bars and Forgings:(1) Corrosion resistant steel, austenitic, annealed or as rolled(a) 304 AMS 5639(2) Solution heat treated, corrosion resistant steel, austenitic, annealed or as rolled(a) 321 AMS 5645(b) 347 AMS 5646(3) Precipitation hard
30、enable, corrosion resistant steel, solution heat treated and artificially aged condition(a) 15-5 PH AMS 5659(b) 17-4 PH AMS 5643(c) 17-7 PH AMS 5644(d) AM-355 AMS 5743(4) Titanium(a) 6Al-4V AMS 4928(b) 6Al-4V AMS 4965b. Tubing:(1) Corrosion resistant steel, austenitic, seamless or welded, annealed(a
31、) 304 MIL-T-8504(2) Heat stabilized, corrosion resistant steel, austenitic, seamless or welded(a) 321 MIL-T-8808(b) 347 MIL-T-8808(3) Titanium(a) 3Al-2.5V AMS 4945SAE INTERNATIONAL AS4897 Page 6 of 18 3.2.1 (Continued):c. Wire:(1) Corrosion resistant steel, austenitic, cold drawn(a) 302 AMS 5637 or
32、ASTM A 580(b) 304 AMS 5697 or ASTM A 580(c) 305 AMS 5685 or ASTM A 580(d) 321 AMS 5689(e) 316 AMS 56903.3 Construction:The hose assembly shall consist of a seamless PTFE inner tube, corrosion-resistant steel-wire reinforcement, an integral silicone cover and corrosion-resistant steel or titanium end
33、 fittings as required to meet the construction and performance requirements of this specification, and as required for its intended use.3.3.1 Inner Tube: The inner tube shall be of a seamless construction of virgin PTFE resin of uniform gage. It shall have a smooth bore and shall be free from pittin
34、g or projections on the inner surface. Additives may be included in the compound from which the tube is extruded.3.3.2 Reinforcement and Cover: The reinforcement shall consist of corrosion-resistant steel wires. The wires shall be so arranged over the inner tube as to provide sufficient strength to
35、ensure conformance with the requirements specified herein. Multiple broken or missing reinforcing wires or buckled wires more than .06 in above the outside diameter surface shall be cause for rejection. Crossed-over reinforcing wires shall not be cause for rejection of the hose assembly. There shall
36、 be an integral silicone cover; silicone cuffs may cover fittings to meet 3.10.18.3.3.3 Fittings: All fittings shall be proven to meet the requirements herein. The hose attachment of fittings shall be a permanent design. Forgings are permitted. Unless specified otherwise by the user, the hose assemb
37、ly end fittings shall have 24 cone fittings in accordance with NAS 1760 to mate with MS33514/AS4375, or flared fittings (AS1708 configurations is acceptable) to mate with AS4395/MS33656 as applicable.3.3.3.1 Insert Fittings: Insert fittings shall be of one-piece construction wherever possible. Those
38、 made of other than one-piece construction shall have either welded joints, using butt-welded design, or braze joints using lap-braze design, and fabricated from annealed corrosion-resistant steel or titanium tubing. Welded and redrawn tubing may be used for corrosion-resistant steel.3.3.3.2 Fitting
39、 Finish:3.3.3.2.1 Corrosion-Resistant Steel Parts: Unless otherwise specified, corrosion-resistant steel parts shall be passivated in accordance with QQ-P-35.3.3.3.2.2 Titanium Alloy Parts: Titanium alloy fittings and nuts shall be fluoride phosphate coated per AMS 2486.SAE INTERNATIONAL AS4897 Page
40、 7 of 18 3.4 Inner Tube Requirements:3.4.1 Apparent and Relative Specific Gravity: The apparent specific gravity of the hose inner tube shall not exceed 2.155 when tested in accordance with ARP1153. The relative specific gravity shall not exceed a value of 2.210 g/cm3when tested as specified in ARP1
41、153.3.4.2 Tensile Strength: When tested in accordance with AS2078 the longitudinal tensile strength for all sizes of tubes shall be 3000 psi minimum. The transverse tensile strength for sizes -10 and larger shall be 2500 psi minimum. For sizes under -10 the transverse strength need not be tested.3.4
42、.3 Elongation: When tested in accordance with AS2078, the elongation shall be a minimum of 200%.3.4.4 Tube Roll: The tube shall not leak, split, burst, or show any evidence of malfunction, when tested through the sequence as specified in AS2078.3.4.5 Tube Proof Pressure: Following tube roll test per
43、 3.4.4, the tube, without reinforcing wires, shall not leak, burst, or show any evidence of malfunction when tested as specified in AS2078 to tube proof pressure of Table 2.FIGURE 1 - Hose and Fitting Dimensions (Table 2)SAE INTERNATIONAL AS4897 Page 8 of 18 TABLE 2 - Hose and Fitting Dimensions as
44、Shown in Figure 1 (inch)3.4.6 Electrical Conductivity: When tested in accordance with AS2078 the electrical current shall be equal to or greater than 10 A for sizes -03 through -08, and equal to or greater than 20 A for sizes -10 and over.3.5 Hose, Dimensional and Physical Requirements:3.5.1 Dimensi
45、ons: The hose assembly dimensions, except for length, shall be as specified in Figure 1 and Table 2.3.5.2 Physical Requirements: Hose assemblies shall meet the physical and weight requirements per Table 1.3.5.3 Bore Check: When bent to the appropriate minimum bend radius as specified in Table 1, the
46、 hose assembly shall permit the free passage of a solid rigid sphere through its length. The diameter of the sphere shall be 90% of the appropriate minimum inside diameter “B” of the end fittings as specified in Table 2. For elbow fittings see Note 2 of Table 2 and 3.9.2.1.2.3.6 Screw Threads:Unless
47、 otherwise specified, fitting threads shall be in accordance with MIL-S-8879, “other threads”.NOTE: Fitting nut thread pitch diameter tolerance increase of 10% following connection for proof testing shall not be cause for rejection of the hose assembly.3.7 Part Numbering of Interchangeable Parts:All
48、 parts complying with this standard and having the same manufacturers or standard part number shall be functionally and dimensionally interchangeable. The item identification and part number requirements of MIL-T-31000 shall govern the manufacturers part numbers and changes thereto.SAE INTERNATIONAL
49、 AS4897 Page 9 of 18 3.8 Identification of Product:The assembly and its component parts shall be permanently marked for identification in accordance with MIL-STD-130. The following special marking shall be added:3.8.1 Fittings: The manufacturers name or trademark may be permanently marked on one element of all end fittings see 3.8.2.3.8.2 Assembly: A permanent marking shall be applied on a fitting or on a permanent band or bands sec
