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/MA2241 AEROSPACE STANDARD MA2241 Issued 1993-11 Reaffirmed 2015-08 Coupling Assem
5、bly, Threadless, Flexible, Fixed Cavity, Self-Bonding, Metric RATIONALE MA2241 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE:This document defines the requirements for a threadless, flexible, self-bonding coupling assembly, which, when installed on machined fixed cavit
6、y ferrules, provides a flexible connection for joining tubing and components in aircraft fuel, vent, or other systems. This assembled coupling, hereafter referred to as the assembly, is designed for use from -54 to 204 C and at 862 kPa operating pressure. AS coupling components referenced herein hav
7、e been qualified to AS1650. Ferrules referenced herein are inch ferrules adapted to metric tubing.1.1 Product Classification:The coupling assemblies shall be of the integral electrical bonding type.2. REFERENCES:2.1 Applicable Documents:The following publications of the issue in effect on date of in
8、vitation for bids or request for proposals, form a part of this document to the extent specified herein unless otherwise specified.2.1.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AS568 Aerospace Size Standard for O-RingsAS1055 Fire Testing of Flexible Ho
9、se, Tube Assemblies, Coils, Fittings and Similar System ComponentsAS1652 Coupling Assembly, Threadless, Fixed Cavity Ferrule Type, Self-BondingAS1654 Sleeve, Threadless Coupling - Fixed Cavity Ferrule TypeAS1655 Coupling, Threadless - Fixed Cavity Ferrule Type, Self-BondingMA2242 Assembled Coupling,
10、 Threadless, Flexible, Fixed Cavity, Self-Bonding, Envelope Dimensions, MetricMA2243 Ferrule, Threadless Coupling, Flexible, Fixed Cavity, Self-Bonding, Swaged, MetricSAE INTERNATIONAL MA2241 Page 2 of 28 2.1.1 (Continued):MA2244 Ferrule End, Threadless Coupling, Flexible, Fixed Cavity, Self-Bonding
11、, Design Standard, MetricMA2245 Ferrule, Threadless Coupling, Flexible, Fixed Cavity, Self-Bonding, Butt Welded, MetricMA2246 Sleeve End, Threadless Coupling, Flexible, Fixed Cavity, Self-Bonding, Design Standard, MetricMA2262 Ferrule, Sleeve, Butt Weld, Threadless Coupling, Flexible Fixed Cavity, S
12、elf-Bonding, MetricMA2263 Ferrule, Sleeve, Swaged, Threadless Coupling, Flexible, Fixed Cavity, Self-Bonding, Metric2.1.2 U.S. Government Publications: Available from Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.PPP-T-60 Tape, Packaging, Waterpro
13、ofPPP-B-566 Boxes, Folding PaperboardPPP-B-576 Box, Wood, Cleated, Veneer, Paper OverlaidPPP-B-585 Boxes, Wood WireboundPPP-B-591 Boxes, Shipping Fiberboard, Wood-CleatedPPP-B-601 Boxes, Wood, Cleated-PlywoodPPP-B-636 Boxes, Shipping FiberboardPPP-B-665 Boxes, Paperboard, Metal-Edged and ComponentsP
14、PP-B-676 Boxes, Set-UpVV-P-236 Petrolatum, TechnicalWW-T-700/6 Tube, Aluminum Alloy, Drawn, Seamless, 6061TT-S-735 Standard Test Fluids; HydrocarbonMIL-P-116 Preservation - Packaging, Methods ofMIL-B-5087 Bonding, Electrical and Lightning Protection for Aerospace SystemsMIL-C-7024 Calibrating Fluid,
15、 Aircraft Fuel System ComponentsMIL-L-10547 Liners, Case and Sheet, Overwrap; Water-Vaporproof or Waterproof, FlexibleMIL-R-25988 Rubber, Fluorosilicone Elastomer, Oil & Fuel Resistant, Sheets, Strips, Molded Parts, & Extruded ShapesMIL-STD-105 Sampling Procedure and Tables for Inspection by Attribu
16、tesMIL-STD-129 Marking for Shipment and StorageMIL-STD-130 Identification Marking of U.S. Military PropertyMIL-STD-810 Environmental Test Methods and Engineering GuidelinesMIL-STD-831 Test Reports, Preparation ofMIL-STD-889 Dissimilar Metals2.1.3 National Aerospace Standards: Available from Aerospac
17、e Industries Association, 1250 Eye Street NW, Washington, DC 20005.NAS1787 Clamp, Tube MountingSAE INTERNATIONAL MA2241 Page 3 of 28 2.1.4 Uniform Classification Committee Publications: Available from The Uniform Classification Committee, 202 Chicago Union Station, Chicago, IL 60606.Uniform Classifi
18、cation CommitteeUniform Freight Classification Rules2.2 Other Publications:The following documents form a part of this document to the extent specified herein. The issues of the documents where are indicated as DOD adopted shall be the issue listed in the current DODISS and supplement thereto, if ap
19、plicable.2.2.1 ANSI Publications: Available from ANSI, 11 West 42nd Street, New York, NY 10036.ANSI/ASME B46.1 Surface Texture2.2.2 ASTM Publications: Available from ASTM, 1916 Race Street, Philadelphia, PA 19103-1187.ASTM D 3951 Packaging, Commercial2.3 Definitions:ASSEMBLED COUPLING: The completed
20、 coupled connection utilizing a coupling assembly to connect two ferrules, which are attached to tube ends.COUPLING ASSEMBLY: The connecting device, which constrains the ferrules and provides a pressure seal and electrical continuity across the ferrules.3. TECHNICAL REQUIREMENTS:3.1 Qualification:As
21、semblies furnished under this document shall be products which are qualified by meeting all of the requirements covered by this document. Manufacturers choosing to produce only a part or parts of the assembled coupling shall qualify the part or parts by complying with the requirements and performing
22、 all tests of this document. The test specimens for qualification of a part or parts shall be tested with a qualified part or parts made by other qualified manufacturers whenever possible.3.2 Materials and Finishes:Materials and finishes for the components shall be those designated on the applicable
23、 MA and AS standard drawing. The assembly materials and finish shall be uniform in quality, free from defects, suitable for service, and in conformance with the applicable specifications and requirements stated herein.SAE INTERNATIONAL MA2241 Page 4 of 28 3.2.1 Dissimilar Materials: Materials shall
24、possess adequate corrosion-resistance characteristics or shall be suitably protected by the use of finishes to resist corrosion, which may result from such conditions as dissimilar metal combinations, moisture, salt spray, and high-temperature deterioration. Dissimilar materials are defined by MIL-S
25、TD-889.3.3 Design and Fabrication:The assembly shall be a lightweight flexible connection for fuel, vent, and other system lines using the basic principles of O-ring sealing. It shall be capable of operating at 862 kPa operating pressure at temperatures from 54 to +93 C in aluminum and -54 to +204 C
26、 in CRES. The assembly shall function at a maximum misalignment of 4 or maximum gap of 6 mm or, in combination, a minimum gap of 1.6 mm at 3 misalignment. If a component uses a sleeve end (MA2246-SIZE), the maximum misalignment is 2 or a maximum gap of 6 mm.3.3.1 Assembled Coupling Components: The a
27、ssembled coupling MA2242 shall consist of ferrules, O-ring seals and a coupling assembly AS1652, as follows:a. Two ferrules: MA2243 or MA2245 or a mix of one O-ring ferrule (MA2243, MA2245) and one sleeve ferrule (MA2262, MA2263)b. Two O-ring seals: User definedc. One coupling assembly: AS16523.3.2
28、Ferrule: Ferrules (MA2243 and MA2244) shall contain the fixed O-ring cavity. The design of the O-ring groove shall be for standard size O-rings as specified in Table 1. Attachment of the ferrule to the tubing shall be by mechanical roller swaging or welding. Ferrule material noted on the part standa
29、rd drawing shall be compatible with the tubing to which it is attached and shall comply with MIL-STD-889.3.3.3 Coupling Assembly: Coupling assemblies envelope drawings MA2242 and AS1652 are provided to aid in drawing callouts. Ferrules are not considered integral to the inch coupling assembly AS1652
30、 because they are usually installed on tubing fabrication drawing and vary according to the attachment method.3.3.3.1 Sleeve: The sleeve shall conform to AS1654 which is designed to carry only hoop stresses and to affect sealing. A portion of the sleeve outside surfaces shall be circumferentially gr
31、ooved or knurled to facilitate installation and removal.3.3.3.2 Coupling: The coupling, conforming to AS1655, shall lock when manually closed and shall be structurally capable of withstanding both the axial and bending moment loads transmitted by the system tubing when the tubing wall thickness is a
32、s specified in Table 2. The closure shall have clear indication of a locked condition both visually and by feel. Quick connect or disconnect action of the latch shall be utilized to allow assembly and removal with one hand. The coupling assembly shall provide a bonding means which meets the Class “S
33、“ electrical bonding requirements of MIL-B-5087.SAE INTERNATIONAL MA2241 Page 5 of 28 3.3.3.3 Fitting and Ferrule Ends: Components and equipment requiring machined fitting end shall utilize ends conforming to MA2244 and MA2246.3.3.4 Seals: O-rings are not considered a part of this document except fo
34、r coupling qualification test requirements. O-ring sizes, AS568, for the couplings are given in Table 1.TABLE 1 - Pressure Limits and O-ring Sizes3.3.5 Dimensions: The assembly envelope dimensions shall be as specified in MA2242. Part dimensions shall be as specified in applicable MA and AS part sta
35、ndards.3.3.6 Weights: The individual components of the coupling shall not exceed the maximum weights listed on the applicable MA and AS part standards.3.4 Performance:The assembled coupling shall meet the following performance requirements.3.4.1 Proof Pressure: The assembled coupling shall meet the
36、negative and positive proof pressures listed in Table 1 without leakage as specified or evidence of other malfunction. Testing is specified in 4.6.2.3.4.1.1 Positive Pneumatic Leakage: The assembled coupling shall withstand pneumatic pressure equal to the proof pressure for 3 min at room temperature
37、 without any visible bubbles starting after 1 min at pressure or other malfunction that would affect assembly or disassembly.3.4.1.2 Negative Pneumatic Leakage: The assembled coupling shall not exhibit a decrease in negative pressure exceeding .001 kPa within a period of 5 min, when subjected to the
38、 negative proof pressure.SAE INTERNATIONAL MA2241 Page 6 of 28 3.4.1.3 Liquid Leakage: The assembled coupling shall withstand liquid pressure equal to the proof pressure for 3 min at room temperature without allowing the escape of liquid or external wetting from any point of the assembly.3.4.2 Fuel
39、Resistance (Aging): The assembled coupling shall not show evidence of malfunction or leakage in excess of 3.4.1.3 when subjected to high temperature fuel aging, 93 C, low temperature fuel aging, -54 C, and air dry out, 93 C. Testing is specified in 4.6.3.3.4.3 Vibration: The assembled coupling shall
40、 show no evidence of malfunction or structural failure and no leakage in excess of 3.4.1.3 after exposure to vibration levels in accordance with 4.6.4. The resistance across the coupling shall not exceed 1 .3.4.4 Repeated Assembly: There shall be no evidence of deformation, damage, or degradation in
41、 latching ability to the assembled coupling and it shall not leak in excess of 3.4.1.3 when subjected to the burst pressure requirements of 3.4.9, after 100 repeated assembly operations. The resistance across the coupling shall not exceed 1 . Testing is specified in 4.6.5.3.4.5 Salt Fog: The assembl
42、ed coupling shall show no evidence of leakage in excess of 3.4.1.3 when subjected to the Table 1 proof and burst pressures and shall show no evidence of excessive corrosion, peeling, chipping, or blistering of the finish nor exposure of base metal under plated surfaces after being subjected to salt
43、fog. The resistance across the coupling shall not exceed 1 . Testing is specified in 4.6.6.3.4.6 Dust: The assembled coupling shall show no damage such as fouling of parts and no evidence of malfunction and shall be capable of withstanding Table 1 proof pressures without evidence of leakage in exces
44、s of 3.4.1.3 after being subjected to the dust test. The resistance across the coupling shall not exceed 1 . Testing is specified in 4.6.7.3.4.7 Flexure: The assembled coupling shall withstand Table 1 burst pressure without evidence of leakage in excess of 3.4.1.3 with no binding or galling of parts
45、 after being subjected to 28 800 flexure cycles with the coupling at an offset of 3. Testing is specified in 4.6.8.3.4.8 Pressure Impulse: The assembled coupling shall withstand 100 000 pressure impulse cycles as defined in Figure 5 without evidence of malfunction or leakage in excess of 3.4.1.3. Te
46、sting is specified in 4.6.9.3.4.9 Burst: The assembled coupling shall not rupture nor show evidence of leakage in excess of 3.4.1.3 at any pressure up to the Table 1 burst pressures. Testing is specified in 4.6.10.3.4.10 Electrical Bonding: The electrical resistance of the assembled coupling, when m
47、easured from tube to tube, shall not exceed 1 at any time. Testing is specified in 4.6.11.3.5 Identification of Product:Coupling assembly parts and ferrules shall be marked for identification in accordance with MIL-STD-130 as specified on the applicable MA and AS standard drawing.SAE INTERNATIONAL M
48、A2241 Page 7 of 28 3.6 Workmanship:Coupling components shall be manufactured and finished in accordance with commercially accepted practices and processes.3.7 Cleaning:The coupling components as supplied shall be free of oil, grease, dirt, or any other foreign material both internally and externally
49、.4. QUALITY ASSURANCE PROVISIONS:4.1 Responsibility for Inspection:Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection and test requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the procuring activity for the performance of the inspection and test requ
