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/MA2126B AEROSPACE STANDARD MA2126 REV. B Issued 1990-06 Revised 2005-02 Reaffirme
5、d 2015-08 Superseding MA2126A Hose Assembly, Polytetrafluoroethylene (PTFE), up to 232 C and 10 500 kPa Procurement Specification, Metric (ISO/DIS 10502) RATIONALE MA2126B has been reaffirmed to comply with the SAE five-year review policy. This standard is word-for-word equivalent to ISO/DIS 10502 e
6、xcept that U.S. backup specifications are used and updated. 1. SCOPE: 1.1 Application: This Metric Aerospace Standard (MA) covers the requirements for polytetrafluoroethylene (PTFE) hose assemblies for use in aerospace hydraulic, fuel, and lubricating oil systems at temperatures between -55C and 232
7、C for Class I assemblies, -55C and 135C for Class II assemblies, and at nominal pressures up to 10 500 kPa (105 bar). The hose assemblies are also suitable for use within the same temperature and pressure limitations in aerospace pneumatic systems where some gaseous diffusion through the wall of the
8、 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 standard, for example oxygen, shall be subject
9、 to the approval of the purchaser. 1.2 Classification: The hose assemblies shall be of the following classes: Class I - All corrosion resistant steel or titanium combination fittings, (232C) Class II - Combination aluminum alloy and corrosion resistant steel fittings, (135C), size DN12 and larger SA
10、E INTERNATIONAL MA2126B Page 2 of 22 2. APPLICABLE DOCUMENTS: The following documents of the issue in effect on date of invitation for bids or requests for proposals, form a part of this specification to the extent specified herein: 2.1 Specifications 2.1.1 Military: MIL-PRF-680 Degreasing Solvent D
11、OD-D-1000 Drawings, Engineering and Associated Lists MIL-STD-130 Identification Marking of U.S. Military Property MIL-STD-1916 DoD Preferred Methods for Accepting of Product MIL-HDBK-831 Preparation of Test Reports MIL-T-8504 Steel, Corrosion-Resisting (304) Aerospace Vehicle Hydraulic Systems, Anne
12、aled, Seamless and Welded MIL-T-8808 Tubing, Steel, Corrosion-Resistant (18-8 Stabilized), Aircraft Hydraulic Quality (Composition 321 and 347) 2.1.2 Industry Publications: SAE Material Specifications: AMS-QQ-S-763 Steel Bars, Wire Shapes, and Forgings, Corrosion-Resisting AMS 4069 Tubing, Seamless,
13、 Drawn, Close Tolerance, 2.5 Mg 0.25 Cr AMS 4079 Tubing, Seamless, Drawn, Round Close Tolerance, 1.0 Mg 0.60 Si 0.28 Cu 0.20 Cr AMS 4082 Tubing, Seamless, Drawn, 1.0 Mg 0.60 Si 0.28 Cu 0.20 Cr, Solution and Precipitation Heat Treated SAE INTERNATIONAL MA2126B Page 3 of 22 2.1.2 (Continued): AMS 4112
14、 Bars, Rods, and Wire, Rolled, Drawn or Cold Finished -4.4 Cu 1.5 Mg 0.60 Mn AMS 4117 Bars and Flash Welded Rings, 1.0 Mg 0.60 Si 0.28 Cu 0.20 Cr, Solution and Precipitation Heat Treated AMS 4121 Bars, Rods, and Wire, Rolled, Drawn or Cold Finished -4.5 Cu 0.85 Si 0.80 Mn 0.50 Mg AMS 4127 Forgings -
15、 1.0 Mg 0.60 Si 0.28 Cu 0.20 Cr, Solution and Precipitation Heat Treated AMS 4928 Titanium Alloy Bars and Forgings, 6A14V, Annealed, 120,000 psi (827 MPa) Yield AMS 4945 Titanium Alloy Tubing, Seamless, Hydraulic, 3A1 - 2.5V, Texture Controlled, 105,000 psi (724 MPa) Yield Strength AMS 4965 Bars, Fo
16、rgings and Rings 6A14V, Solution and Precipitation Heat Treated AMS 5639 Steel Bars, Forgings, Tubing, and Rings, Corrosion-Resistant 19 Cr - 10 Ni (SAE 30304) AMS 5643 Steel Bars, Forgings, Tubing, and Rings, Corrosion Resistant 16.5 Cr - 4.0 Ni - 4.0 Cu AMS 5644 Steel, Bars, and Forgings, Corrosio
17、n and Heat Resistant 17 Cr - 7 Ni - 1 Al AMS 5645 Steel Bars, Forgings, Tubing, and Rings, Corrosion and Heat Resistant 18 Cr - 10 Ni - 0.40 Ti (SAE 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, Forging
18、s, Tubing and Rings 19 Cr 9.5 Ni, Solution Heat Treated AMS 5689 Wire, Corrosion and Heat Resistant 18 Cr - 9.5 Ni - Ti (SAE 30321) Solution Heat Treated SAE INTERNATIONAL MA2126B Page 4 of 22 2.1.2 (Continued): AMS 5690 Wire, Corrosion and Heat-Resistant 17 Cr - 12 Ni - 2.5 Mo (SAE 30316) AMS 5697
19、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, Subzero Cooled, Equalized, and Over Tempered SAE Aerospace Recommended Practices: ARP1153 Methods for Determining Relative Specific Gravity (ISO 7258) ARP1835 Pr
20、eparation for Delivery, General Requirements for Hose Assemblies AS611 Tetrafluoroethylene Hose Assembly Cleaning Methods American Society for Testing and Materials: ASTM A 262 Standard Recommended Practices for Detecting Susceptibility to Intergranular Attack in Stainless Steel ASTM D 792 Tests for
21、 Specific Gravity and Density of Plastics by Displacement SAE Aerospace Standards: AS1055 Aircraft - Environmental Conditions and Test Procedures for Airborne Equipment - Resistance to Fire in Designated Fire Zones (ISO/TR2685) AS1072 Sleeve, Hose Assembly, Fire Protection MA1370 Screw Threads, Cont
22、rolled Root Radius (J-Threads) - Metric Series (ISO 5855/3) MA2002 Impulse Testing of Hydraulic Hose, Tubing and Fitting Assemblies (ISO 6772) MA2005 Aerospace Construction - Separable Tube Fittings for Fluid Systems - General Specification (ISO 7169) SAE INTERNATIONAL MA2126B Page 5 of 22 2.1.2 (Co
23、ntinued): MA2078 Aerospace - Fluid Systems - Test Methods for Polytetrafluoroethylene (PTFE) Hose Assemblies (ISO 8829) MA2095 Aerospace Fluid Systems - 24 Cone Fittings, Geometrical Definition of Ends (ISO 7321) Copies may be obtained from the SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
24、 AIA National Aerospace Standards: NAS847 Caps and Plugs, Protective, Dust and Moisture Seal, General Specification for NAS1760 Fitting End, Flareless Acorn, Standard Dimensions for Copies may be obtained from the National Standards Association, Inc., 5161 River Road, 1200 Quince Orchard Road, Gaith
25、ersburg, MD 20878. 2.1.3 Order of Precedence: In the event of a conflict between the text of this specification and the reference cited herein, the text of this specification shall take precedence. 3. REQUIREMENTS: 3.1 Qualification: Hose assemblies supplied in accordance with this metric standard s
26、hall be representative of products which have been subjected to and which have successfully passed the material and qualification tests specified in this standard. They shall be listed on or approved for listing in the applicable qualified products list. 3.2 Materials: The hose assemblies shall be u
27、niform in quality and free from defects in material as is consistent with good manufacturing practice, and shall conform with the applicable specifications and requirements specified in this metric standard. All materials not specifically described herein shall be of the highest quality and suitable
28、 for the purposes intended. SAE INTERNATIONAL MA2126B Page 6 of 22 3.2.1 Metals: Metals used in the hose shall be corrosion-resistant steel, and fittings shall be corrosion- resistant steel, titanium, or aluminum alloy suitably treated to resist corrosion when in storage or during normal service use
29、. All end fitting sockets (collars) crimped or swaged, fabricated from type 304 stainless 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 or swaging operation. Sockets fabricated from stabilized austenitic ste
30、el are acceptable without being subjected to the embrittlement test. Metals used in the hose and fittings shall be as listed below: a. Bars and Forgings: Corrosion-resistant steel, austenitic, annealed or as rolled 304 AMS 5639 Heat-stabilized corrosion-resistant steel, austenitic, annealed or as ro
31、lled 304 AMS 5647 321 AMS 5645 347 AMS 5646 Precipitation-hardening corrosion-resistant steel - resolution heat treated and artificially aged condition 15-5 PH AMS 5743 17-4 PH AMS 5643 17-7 PH AMS 5644 Titanium 6Al-4V AMS 4928 Aluminum Aluminum Alloy, 2014-T6 AMS 4121 Aluminum Alloy, 2024-T6 AMS 41
32、12 Aluminum Alloy, 6061-T6/T651 AMS 4117 Aluminum Alloy, 6061-T6 QQ-A-367 SAE INTERNATIONAL MA2126B Page 7 of 22 3.2.1 (Continued): b. Tubing: Aluminum Alloy, 5052 AMS 4069 Aluminum Alloy, 6061 AMS 4082 Corrosion-resistant steel, austenitic, seamless or welded, annealed 304 MIL-T-8504 Heat stabilize
33、d corrosion-resistant steel, austenitic, seamless or welded 321 MIL-T-8808 347 MIL-T-8808 Titanium 3Al-2.5V AMS 4945 c. Wire: Corrosion-resistant steel, austenitic, cold drawn 321 AMS 5689 316 AMS 5690 304 AMS 5697 3.3 Construction: The hose assembly shall consist of a seamless PTFE inner tube, corr
34、osion-resistant steel-wire reinforcement, and aluminum, corrosion-resistant steel, or titanium end 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 construct
35、ion of virgin PTFE resin of uniform gage. 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. SAE INTERNATIONAL MA2126B Page 8 of 22 3.3.2 Reinforcement: The reinforcement shall con
36、sist of corrosion-resistant steel wires. The wires shall be so arranged over the inner tube as to provide sufficient strength to ensure conformance with the requirements specified herein. Broken or missing reinforcing wires or buckled wires more than 1.5 mm above the outside diameter surface shall b
37、e cause for rejection. Crossed-over reinforcing wires shall not be cause for rejection of the hose assembly. 3.3.3 Fittings: All fittings shall be proven to meet the requirements herein. The hose attachment fittings may be of a permanent or of a reusable design. Forgings are permitted. Unless specif
38、ied otherwise by the user, the hose assembly end fittings shall have 24 cone fittings in accordance with MA2095 (ISO 7321). 3.3.3.1 Insert Fittings: Insert fittings shall be of one-piece construction wherever possible. Those made of other than one-piece construction shall have either welded joints u
39、sing butt-welded or lap-weld design, or braze joints using lap-bronze design, and fabricated from annealed corrosion-resistant steel, titanium, or aluminum alloy tubing. Welded and redrawn tubing may be used for corrosion- resistant steel. 3.3.3.2 Fitting Finish: 3.3.3.2.1 Aluminum Parts: Unless oth
40、erwise specified, aluminum parts shall be finished in accordance with MIL-A-8625. type II, and dyed yellow on flareless parts and blue on flared parts. The color fastness requirement of MIL-A-8625 does not apply. 3.3.3.2.2 Corrosion-Resistant Steel Parts: Unless otherwise specified, corrosion-resist
41、ant steel parts shall be passivated by immersion in a solution of 2% sodium dichromate in nitric acid of a concentration of 15 to 25% by volume for 15 or 30 min at a temperature of 120F + 5. Parts shall then be thoroughly rinsed in water and dried. 3.3.3.2.3 Titanium Alloy Parts: Titanium alloy fitt
42、ings and nuts shall be fluoride phosphate coated per AMS-2486. 3.4 Inner Tube Requirements: 3.4.1 Density and Relative Density: The relative density of the hose inner tube shall not exceed 2.155 when tested in accordance with MA2078 (ISO 7258 Method A or B). The density shall not exceed a value of 2
43、.204 g/cm3when tested as specified in MA2078 (ISO 7258, Method C). 3.4.2 Tensile Strength: When tested in accordance with MA2078 (ISO 8829), paragraph 4.2, the longitudinal tensile strength for all sizes of tubes shall be 15.1 MPa minimum. The transverse tensile strength for sizes DN16 and larger sh
44、all be 12.4 MPa minimum. For sizes under DN16, the transverse strength need not be tested. SAE INTERNATIONAL MA2126B Page 9 of 22 3.4.3 Elongation: When tested in accordance with MA2078 (ISO 8829), paragraph 4.2, the elongation shall be a minimum of 200%. 3.4.4 Tube Roll: The tube shall not leak, sp
45、lit, burst, or show any evidence of malfunction, when tested through the sequence as specified in MA2078 (ISO 8829), paragraph 4.3.1. 3.4.5 Tube Proof Pressure: Following tube roll test per 3.4.4, the tube, without reinforcing wires, shall not leak, burst, or show any evidence of malfunction when te
46、sted as specified in MA2078 (ISO 8829), paragraph 4.3.2. 3.4.6 Electrical Conductivity: When tested in accordance with MA2078 (ISO 8829), paragraph 4.4, the electrical current shall be equal to or greater than 10 A for sizes DN05 through DN12, and equal to or greater than 20 A for sizes DN16 and ove
47、r. 3.5 Hose, Dimensional and Physical Requirements: 3.5.1 Dimensions: The hose assembly dimensions, except for length, shall be as specified in Figure 1 and Table 1. FIGURE 1 - Hose and Fitting Dimensions (Table 1) SAE INTERNATIONAL MA2126B Page 10 of 22 TABLE 1 - Hose and Fitting Dimensions as Show
48、n in Figure 1 (mm)1)Hose Size (DN) Fitting O.D. A2)Max Fitting I.D. B3)Min Attach- ment Length C Max Hose I.D. Braided D Min Hose O.D. BraidedE Min Hose O.D. BraidedE Max Wall Thickness, Inner Tube T Min Wall Thickness, Inner Tube T Max Numberof Braids 05 06 08 10 12 16 20 25 32 40 12.7 14.2 16.0 18
49、.0 21.4 26.0 30.0 38.6 50.8 58.0 2.0 3.4 4.9 6.5 8.5 11.0 13.8 19.7 25.4 31.8 31.8 31.0 34.3 37.0 44.0 49.0 55.1 64.8 61.7 68.1 2.3 4.4 5.8 7.6 9.9 12.3 15.6 21.6 28.0 34.1 5.8 7.7 9.3 10.9 13.9 16.3 19.5 27.4 33.7 41.6 6.8 9.5 10.6 12.7 15.6 20.3 23.0 29.0 35.3 43.3 0.89 0.89 0.89 0.89 0.97 1.07 1.07 1.07 1.14 1.65 1.19 1.19 1.19 1.19 1.27 1.37 1.37 1.37 1.45 1.96 1 1 1 1 1 1 1 2 2 2 1)Dimensions listed in
