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/MA2094 AEROSPACE STANDARD MA2094 Issued 1995-12 Reaffirmed 2015-08 Test Methods f
5、or Tube-Fitting Assemblies, Metric (ISO 10583) RATIONALE MA2094 has been reaffirmed to comply with the SAE five-year review policy. This document is equivalent to ISO 10583 with the exception that U.S. materials, test fluids, and pro-cess specifications are used where ISO standards are not available
6、.FOREWORDThis document has been prepared to standardize on the test methods for qualification of tube-fitting assemblies used in aircraft fluid systems. Compliance with these test methods is necessary for assemblies which are used in systems where a malfunction could affect the safety of flight.1. S
7、COPE:This SAE Aerospace Standard (AS) specifies test methods for fitting assemblies used in aircraft fluid systems in the pressure classes B, D, and E, and in temperature Types I, II, and III of MA 2001.This document applies each time that it is referred to in a procurement specification or other de
8、finition document.Fluids and materials used for the tests are listed in Section 2.2. REFERENCES:2.1 SAE Publications:Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AS1055 Fire Resistance, Fire Test and Performance Requirements for Flexible Hose and Rigid Tube AssembliesMA2001
9、Aerospace Fluid Systems, Pressure and Temperature Classifications (ISO 6771)MA2002 Impulse Testing of Hydraulic Hose, Tubing and Fittings (ISO 6772)MA2003 Rotary Flexure Testing (ISO 7252)MA2004 Thermal Shock Testing for Piping and Fittings (ISO 6773)SAE INTERNATIONAL MA2094 Page 2 of 9 2.2 U.S. Gov
10、ernment Publications:Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.P-D-680 Dry Cleaning SolventTT-I-735 Isopropyl AlcoholTT-S-735 Standard Test Fluids, HydrocarbonMIL-H-5606 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordna
11、nceMIL-T-5624 Turbine Fuel, Aviation, Grade JP4, JP5/JP8 STMIL-L-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic BaseMIL-C-81302 Cleaning Compound, Solvent, TrichlorotrifluoroethaneMIL-H-83282 Hydraulic Fluid, Fire Resistant, Synthetic, Hydrocarbon Base, AircraftMIL-STD-810 Environmental Te
12、st Methods (ISO 7137)2.3 ANSI Publications:Available from ANSI, 11 West 42nd Street, New York, NY 10036-8002.ISO 7137-1992 Aircraft - Environmental Conditions and Test Procedures for Airborne Equipment (Endorsement of EUROCAE/ED-14C and RTCA/DO-160C)2.4 Definitions:AMBIENT TEMPERATURE: Temperature i
13、n the test area or test chamber.ROOM TEMPERATURE: Temperature in the test laboratory between 15 and 32 C.3. QUALITY CONFORMANCE INSPECTION PROCEDURES:Fitting components and assemblies shall be inspected using the normal tools and procedures.4. QUALIFICATION AND PERFORMANCE TEST PROCEDURES:4.1 Proof
14、Pressure Test:This test is intended to verify the structural integrity of the fitting assembly prior to its use for other tests or in the production of tube or duct assemblies.Connect test assemblies to a source of pressure with one end free to move. Bleed all air from the system before any pressure
15、 is applied. Proof pressure test at a value as specified by the procurement specification for a minimum period of 3 min. The rate of pressure rise for system pressures of 10.5 MPa and over shall be 150 MPa 37.5 MPa (1500 bar 375 bar) per minute. For system pressures under 10.5 MPa, the rate shall be
16、 30 MPa 7.5 MPa (300 bar 75 bar) per minute. The test shall be conducted at ambient temperature.SAE INTERNATIONAL MA2094 Page 3 of 9 4.2 Pneumatic Pressure Test:This test is intended to verify that the fitting assembly will perform without leakage in pneumatic applications. This test is often used a
17、t the start and completion of other tests.Solvent clean and air dry test fittings prior to testing. Assemble fittings using a lubricant or compound on the thread and sleeve/nut shoulder (unless they have a solid film lubrication) and tighten to the torques specified in the procurement specification.
18、 Pressurize with nitrogen. Maintain the pressure for 3 min while the specimens are immersed in water or suitable oil. Specimens shall be pressure tested at ambient temperature.WARNING: Conduct pneumatic tests in a special device to protect the operator.4.3 Impulse Test:This test is intended to verif
19、y the service life of a fitting assembly when exposed to hydraulic pressure cycling or pressure surging.Impulse test the assemblies in accordance with MA2002 Test Type I specimens at ambient temperature and Types II and III at the temperatures and in the sequence specified in MA2002.4.4 Hydrostatic
20、Burst Pressure Test:This test is intended to verify that a specified overpressure safety factor is being met, also to establish the failure mode under overpressure.WARNING: Conduct the test in a special device to protect the operator.Connect the test assembly to a source of pressure with one end fre
21、e to move. Bleed all air from the system before any pressure is applied. Increase the pressure at a rate of 150 MPa 37.5 MPa, (1500 bar 375 bar) per minute until the assembly bursts. Specimens shall be tested at ambient temperature.Specimens from impulse or corrosion testing may be used for the burs
22、t test.4.5 Flexure Test:This test is intended to verify the service life of a fitting assembly when exposed to cyclic bending stresses while the assembly is under system pressure.Unless otherwise specified by the purchaser, conduct the test in accordance with MA2003. Determine the bending stress in
23、the flexure test specimen prior to the application of internal pressure.SAE INTERNATIONAL MA2094 Page 4 of 9 4.6 Stress Corrosion Test:This test is intended to verify that the tube-to-fitting joining process did not adversely affect the resistance to stress corrosion in the joining area.Install the
24、test assembly in a test apparatus (see Figure 1) which imposes a bending stress level equal to (85% 5%) of the specified tubing yield strength (0.2% proof stress) minimum at the tubing/fitting assembly interface. Apply an internal pressure equal to the nominal system pressure without removing the be
25、nding stress. Then subject the assembly to test procedure MIL-STD-810 (salt spray test). After exposure, subject the assembly to the burst pressure test at ambient temperature. Clean, section, and metallurgically examine the tube/fitting joint for intergranular or stress corrosion cracking.FIGURE 1
26、- Schematic Diagram of Stress Corrosion Test Assembly4.7 Reuse Capability:4.7.1 Port Connections: This test is intended to verify that port connections can be repeatedly assembled and disassembled during installation and in service.SAE INTERNATIONAL MA2094 Page 5 of 9 4.7.1 (Continued):Screw togethe
27、r and unscrew specimens eight times. Each of the eight cycles shall include the complete removal of the fitting from the port and of the tube ends from the fitting. Install new elastomeric port seals, unless the reuse of seals is specified. Following the first, fourth, and eighth installations, cond
28、uct further proof tests. Specimens shall pass pneumatic pressure testing after the eighth installation. The specimens may be used for subsequent impulse and burst tests.NOTE: It is not necessary to perform this test on semipermanent port connections.4.7.2 Tube Fittings: This test is intended to veri
29、fy that fitting components can be repeatedly assembled and disassembled in service.Test the tube fittings to the tightening torques specified in the procurement specification, one half of the fitting connections using the minimum, the other half using the maximum tightening nut torques. Do not mix t
30、he two groups. Following the first, fourth, and eighth installations, conduct proof tests. Specimens shall pass gaseous pressure testing after the eighth installation. The specimens may be used for subsequent impulse and burst tests.4.8 Tensile Test:This test is intended to verify that the fitting a
31、ssembly may be exposed to axial loads in service.Mount assembled specimens in a tensile machine and strain to rupture at a speed of 4 mm/min 0.3 mm/min. Fittings may be tensile tested while system pressure is maintained in the specimen, using adequate safety precautions.4.9 Thermal Shock Test:This t
32、est is intended to verify that the fitting or coupling assembly will not leak if the temperature of the fluid flowing through the fitting or coupling changes between extremes, as can occur, for example, in certain fuel system applications.Mount and test the test assemblies in accordance with MA2004.
33、4.10 Fire Test:This test is intended to verify that the fitting assembly will not leak if exposed to an intense fire.Mount and test the assembly in accordance with AS1055 or the purchasers instructions.5. TEST SPECIMENS AND TEST FLUID:5.1 Test Specimens:Unless otherwise specified by the buyer, the t
34、ube specimens shall be as illustrated in Figure 2. Specimen lengths for the various tests shall be as shown in Table 1.SAE INTERNATIONAL MA2094 Page 6 of 9 FIGURE 2 - Testing and Test SamplesSAE INTERNATIONAL MA2094 Page 7 of 9 FIGURE 2 (CONTINUED)SAE INTERNATIONAL MA2094 Page 8 of 9 TABLE 1 - Test
35、Specimens, Free Tube Length Between Sleeves5.2 Test Fluid:Unless otherwise specified, tests shall be conducted using a petroleum base or synthetic hydraulic fluid for Types I and II and a silicate ester base hydraulic fluid for Type III system fittings (see MA2001). Water may be used, whenever pract
36、ical, for proof, burst, stress corrosion, and repeated assembly (reuse) testing. Air or nitrogen shall be used for the pneumatic tests. Leakage and proof tests for pneumatic system applications shall be conducted with air or nitrogen.Test fluids shall be in accordance with the following specificatio
37、ns:a. TT-S-735b. MIL-H-5606c. MIL-T-5624d. MIL-L-7808e. MIL-H-83282f. AS12415.3 Cleaning Fluids:Cleaning fluids shall be in accordance with the following specifications:a. PP-D-680b. TT-I-735c. MIL-C-81302SAE INTERNATIONAL MA2094 Page 9 of 9 5.4 Test Temperature:Tests shall be conducted at room temperature, unless otherwise specified.PREPARED BY SAE SUBCOMMITTEE G-3B, AEROSPACE FITTINGS OFCOMMITTEE G-3, AEROSPACE COUPLINGS, FITTINGS, HOSE & TUBING ASSEMBLIES
