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/MA620 AEROSPACE STANDARD MA620 Issued 1998-03 Reaffirmed 2015-07 Hose Assemblies,
5、 Convoluted Polytetrafluoroethylene Metallic Reinforced, High Temperature, Medium Pressure, Aircraft Metric RATIONALE MA620 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE :This SAE Aerospace Standard (MA) defines the requirements for a convoluted polytetrafluoroethylene
6、 (PTFE) lined, metallic reinforced, hose assembly suitable for use in aircraft fluid systems at temperatures of -55 to 204 C and at operating pressures per Table 1.TABLE 1 - Physical Requirements of Hose Assemblies and Weight of HoseHoseSizeDNHoseWeightMax 1kg/mOperatingPressureMaxkPaProofPressureMa
7、xkPaBurstPressureRoomT emperatureMinkPaBurstPressureHighTemperatureMinkPaBend RadiusAt Inside ofBend Minmm06 0.143 6900 13 800 27 600 19 300 3210 0.179 6900 13 800 27 600 19 300 5712 0.268 6900 13 800 27 600 19 300 7316 0.357 6900 12 410 24 820 17 240 7620 0.483 6900 12 410 24 820 17 240 9525 0.590
8、6900 12 410 24 820 17 240 12732 0.893 6900 12 410 24 820 17 240 15940 1.071 5170 10 340 20 700 14 480 19150 1.607 1720 3 440 6 900 4 820 25463 1.964 689 1 380 2 760 1 930 31876 2.589 689 1 380 2 760 1 930 381101 3.572 689 1 380 2 760 1 930 6101 Hose weight shall be determined on a minimum length of
9、305 mm.SAE INTERNATIONAL MA620 Page 2 of 22 1.1 Types :1.1.1 Hose assemblies furnished under this document may be of two types:Type I - Non-conductive Inner TubeType II - Conductive Inner Tube1.1.2 Hose assemblies furnished under this document may be of the following classes. If no class is defined
10、then Class 1 shall prevail.Class 1 - Liquid Proof T estClass 2 - Liquid and Pneumatic Proof Test2. REFERENCES :2.1 Applicable Documents :The following publications form a part of this specification to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue
11、 of other publications shall be the issue in effect on the date of purchase order. In the event of conflict between the text of this specification and references cited herein, the text of this specification takes precedence. Nothing in this specification, however, supersedes applicable laws and regu
12、lations unless a specific exemption is obtained.2.1.1 SAE Publications : Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 5556 Steel, Corrosion and Heat Resistant, Seamless or Welded Tubing, 18Cr 11Ni 0.70(Cb+ Ta) (SAE 30347), Hydraulic, Solution Heat TreatedAMS 5557 Steel T
13、ubing, Seamless and Welded, Corrosion and Heat Resistant, 18.5Cr 10.5Ni 0.40Ti (SAE 30321), Hydraulic, Solution Heat TreatedAMS 5567 Steel Tubing, Seamless or Welded, Corrosion Resistant, 19Cr 10Ni (SAE 30304), Hydraulic, AnnealedAMS 5570 Steel, Corrosion and Heat Resistant, Seamless Tubing, 18Cr 11
14、Ni 0.40Ti (SA E 30321), Solution Heat TreatedAMS 5571 Steel, Corrosion and Heat Resistant, Seamless Tubing, 18Cr 10.5Ni 0.70(Cb+ Ta) (SAE 30347), Solution Heat TreatedAMS 5575 Steel, Corrosion and Heat Resistant, Welded Tubing, 18Cr 10.5Ni 0.70(Cb+ T a) (SA E 30347), Solution Heat TreatedAMS 5636 St
15、eel, Corrosion Resistant, Bars and Wire, 18Cr 9.0Ni (SAE 30302) Solution Heat Treated and Cold Drawn, 100 ksi T ensile StrengthAMS 5637 Steel, Corrosion Resistant, Bars and Wire, 18Cr 9.0Ni (SAE 30302) Solution Heat Treated and Cold Drawn, 125 ksi T ensile StrengthAMS 5639 Steel Bars, Wire, Forgings
16、, Tubing and Rings, Corrosion Resistant, 19Cr 10Ni (SA E 30304), Solution Heat TreatedAMS 5643 Steel, Corrosion Resistant, Bars, Wire, Forgings, Tubing and Rings, 16Cr 4.0Ni 0.30(Cb+ Ta) 4.0Cu (SAE 17-4PH), Solution Heat Treated, Precipitation HardenableAMS 5644 Steel Bars and Forgings, Corrosion Re
17、sistant, 17Cr 7.0Ni 1.0Al (SAE 17-4PH)SAE INTERNATIONAL MA620 Page 3 of 22 2.1.1 (Continued):AMS 5645 Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, Tubing and Rings, 18C r 10Ni 0.40Ti (SAE 30321), Solution Heat TreatedAMS 5646 Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, T
18、ubing and Rings, 18C r 11Ni 0.60(Cb+ T a) (SAE 30347), Solution Heat TreatedAMS 5656 Steel, Corrosion Resistant, Bars, Wire, Forgings, Extrusions and Rings, 9.0Mn 20Cr 6.5Ni 0.27N (SAE 21-6-9), Solution Heat TreatedAMS 5659 Steel, Corrosion Resistant, Bars, Wire, Forgings, Rings and Extrusions, 15Cr
19、 4.5Ni 0.30Cb 3.5Cu (SAE 15-5PH), Consumable Electrode Melted, Solution Heat Treated, Precipitation HardenableAMS 5688 Steel, Corrosion Resistant, Wire, 18Cr 9.0Ni (SAE 30302) Spring T emperAMS 5689 Steel, Corrosion and Heat Resistant, Wire 18Cr 10.5Ni 0.40Ti (SAE 30321), Solution Heat TreatedAMS 56
20、90 Steel, Corrosion and Heat Resistant, Wire 17Cr 12Ni 2.5Mo (SAE 30316), Solution Heat TreatedAMS 5697 Steel, Corrosion Resistant, Wire 19Cr 9.5Ni (SAE 30304), Solution Heat TreatedAS150 Hose Assembly, Type Classifications of, Basic Performance and Fire ResistanceAS611 T etrafluoroethylene Hose Ass
21、embly Cleaning MethodsARP908 Hose and Tube Fitting - Installation and Qualification Test T orqueAS1055 Fire Testing of Flexible Hose, Tube Assemblies, Coils, Fittings and Similar System ComponentsARP1835 Preparation for Delivery General Requirements for Hose AssembliesMA1370 Screw Threads, MJ Profil
22、e, MetricMA2078 T est Methods, Hose Assemblies, Polytetrafluoroethylene (PTFE)MA2014 Fitting End, Flareless Acorn, MetricMA2095 Fitting Design Standard, 24 degree Cone, Metric2.1.2 ASTM Publications : Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM A 262 Standard Re
23、commended Practices for Detecting Susceptibility to Intergranular Attack in Stainless SteelASTM A 313 Standard Specification for Stainless Steel Spring WireASTM A 580 Specification for Stainless and Heat Resisting Steel WireSAE INTERNATIONAL MA620 Page 4 of 22 2.1.3 U.S. Government Publications : Av
24、ailable from DODSS P , Subscription Services Desk, Buildin g 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.P-D-680 Dry Cleaning SolventQQ-S-763 Steel Bars, Wire Shapes, and Forgings, Corrosion-ResistingQQ-P-35 Passivation Treatments for Corrosion-Resistant SteelsTT-I-735 Isopropyl AlcoholTT-S-
25、735 Standard Test Fluids, HydrocarbonsMIL-C-5501 Caps and Plugs, Protective, Dust and Moisture Seal, General SpecificationMIL-H-5606 Hydraulic Fluid, Petroleum Based, Aircraft, Missile and OrdnanceMIL-T-5624 Turbine Fuel, Aviation, Grades JP-4 and JP-5MIL-L-7808 Lubricating Oil, Aircraft Turbine Eng
26、ine, Synthetic BaseMIL-T-8504 Tubing, Steel, Corrosion-Resisting (304) Aerospace Vehicle, Hydraulic Systems, Annealed, Seamless and WeldedMIL-T-8808 Tubing, Steel, Corrosion-Resistant (18-8 Stabilized), Aircraft Hydraulic QualityMIL-H-83282 Hydraulic Fluid, Fire Resistant Synthetic Hydrocarbon Base,
27、 AircraftMIL-STD-100 Engineering Drawing PracticesMIL-STD-130 Identification Marking of U.S. Military PropertyMIL-STD-831 T est Reports, Preparation of2.1. 4 ASME Publications : Available from ASME, 345 E. 47th Street, New York, NY 10017.ANSI/ASME B46.1 Surface T exture2.2 Hose Assembly Procurement
28、Specifications :Refer to MA620SUP1 for a listing of applicable hose assembly procurement standards applicable to this document.3. TECHNICAL REQUIREMENTS :3.1 Qualification :The hose assemblies furnished under this specification shall be products which are qualified by meeting all the requirements co
29、vered by this document.3.2 Material :The hose assembly materials shall be uniform in quality, free from defects, consistent with good manufacturing practice and shall conform to applicable specifications and the requirements specified herein. All materials not specifically described herein shall be
30、of the highest quality and suitable for the purpose intended.SAE INTERNATIONAL MA620 Page 5 of 22 3.2.1 Metals :Metals used in the hose and fittings shall be corrosion-resistant and shall conform to the following specifications:Bars and Forgings:QQ-S-763 Class 304 - Cond. A or Cond. B (AMS 5639)QQ-S
31、-763 Class 302 - Cond. A or Cond. B (AMS 5636 or AMS 5637)QQ-S-763 Class 321 - Cond. A (AMS 5645)QQ-S-763 Class 347 - Cond. A (AMS 5646)AMS 5643 17-4PHAMS 5644 17-7PHAMS 5656 21-6-9AMS 5659 15-5PHTubing:MIL-T-8504 Comp. 304 (AMS 5567)MIL-T-8808 Type I or Type II, Comp. 321 (AMS 5570 or AMS 5557)MIL-
32、T-8808 Type I or Type II, Comp. 347 (AMS 5571, AMS 5575 or AMS 5556)Wire:ASTM A 580/A 313 Comp. 302 (AMS 5688)ASTM A 580/A 313 Comp. 304 (AMS 5697)ASTM A 580/A 313 Comp. 316 (AMS 5690)ASTM A 580/A 313 Comp. 321 (AMS 5689)3.3 Construction :The hose assembly shall consist of a convoluted polytetrafluo
33、roethylene inner tube, which may be covered with convoluted woven glass cloth and/or other suitable materials, corrosion-resistant steel-wire reinforcement, and corrosion-resistant steel end fittings as required to meet the construction and performance requirements of this document and as required f
34、or its intended use.3.3.1 Inner Tube :The inner tube shall be of a convoluted construction of virgin polytetrafluoroethylene resin designed to promote easy bending. It shall be free from pitting or projections on the inner surface. Additives may be included in the compound from which the tube is fab
35、ricated.3.3.2 Reinforcement :The reinforcement shall consist of corrosion-resistant steel wires conforming to the applicable specifications listed in 3.2.1. The wires shall be so arranged over the inner tube as to provide sufficient strength to ensure conformance with the requirements specified here
36、in. Broken reinforcing wires shall be cause for rejection. Crossed-over reinforcing wires shall not be cause for rejection of the hose assembly.SAE INTERNATIONAL MA620 Page 6 of 22 3.3.3 Interlayers :Interlayers, if used, shall be of a suitable material and shall be resistant to all fluids with whic
37、h the hose may come in contact during normal service. They shall be capable of withstanding temperatures of -55 to 204 C and shall not extrude through the outer braid during testing or in service.3.3.4 Fittings :All fittings shall be permanently attached and proven to meet the requirements herein. S
38、tandard hose assemblies shall have flared fittings to meet MA2095, flareless fittings according to MA2014 in accordance with applicable documents (see 2.1). Fitting hex portions shall fit standard wrench openings.3.3.4.1 Straight Fittings :Fittings shall be of one-piece construction. Weld or braze j
39、oints must not be located in the fluid paths, except welded and redrawn tubing per MIL-T-8504 or MIL-T-8808 may be used.3.3.4.2 Other Fittings :Other fittings, including elbow fittings, shall be of one piece construction to the maximum extent possible. When one piece construction is not used, the jo
40、ints shall be welded using either butt-weld or lap-weld design. For double elbow assemblies, the elbows may be treated as non-standard.3.3.4.3 End Fitting Collars (Sockets) : All end fitting collars (sockets) crimped or swaged, fabricated from Type 304 stainless steel are required to be capable of p
41、assing 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 steel (304L, 321 or 347) are acceptable without being subjected to the embrittlement test.3.3.4.4 Fitting Finish :3.3.4.4.1 Corrosio
42、n-Resistant Steel Parts : Unless otherwise specified, corrosion resistant steel parts shall be passivated in accordance with QQ-P-35.3.4 Dimensions :The hose assembly dimensions, except for length, shall be as specified in Figure 1 and T able 2.1 Cross corners of nut and socket hex may exceed “D” di
43、mensions.FIGURE 1 - Hose and Fitting DimensionsSAE INTERNATIONAL MA620 Page 7 of 22 TABLE 2 - Hose and Fitting DimensionsHoseSizeDNRigidTubing ODRefmmFitting IDMinA 1mmHose IDMinBmmHose WireBraid ODCmm 0.81Fitting ODMaxDmm06 6.35 3.35 6.86 11.30 14.010 9.53 6.50 9.02 14.10 17.312 12.70 8.76 12.95 19
44、.18 21.816 15.88 10.92 15.24 21.60 24.120 19.05 16.12 19.43 26.92 32.525 25.40 21.21 24.89 32.97 37.332 31.75 27.56 30.99 38.76 43.240 38.10 33.27 37.59 45.47 50.850 50.80 46.36 49.20 59.26 65.063 63.50 57.86 61.90 73.03 76.276 76.20 70.38 74.46 87.12 94.0101 101.60 93.98 100.00 113.16 119.41 Hose a
45、ssembly conformance to minimum specified inside diameter shall be verified by passing the designated or larger spherical ball through the hose assembly.SAE INTERNATIONAL MA620 Page 8 of 22 3.4.1 Hose Weight :Hose consisting of inner tube, reinforcement and interlayers as outlined in 3.3.1 through 3.
46、3.3 shall not exceed the maximum weights specified in T able 1.3.5 Performance :The hose assembly shall meet the following performance requirements:3.5.1 Proof Pressure :3.5.1.1 Class 1 hose assemblies shall withstand the proof pressure listed in Table 1 without malfunction or leakage when tested wi
47、th water in accordance with 4.6.2.1.TABLE 3 - Minimum Inspection Ball Size for Hose Assembly 1HoseSizeDNStraight EndFittingmmElbow EndFittingmm06 3.02 2.8510 5.85 5.5312 7.88 7.4516 9.83 9.2820 14.51 13.7025 19.09 18.0332 24.80 23.4340 29.94 28.2850 41.72 39.4163 52.07 49.1876 63.34 59.82101 84.58 7
48、9.881 Hose assembly conformance to minimum specified inside diameter shall be verified by passing the designated or larger spherical ball through the hose assembly.SAE INTERNATIONAL MA620 Page 9 of 22 3.5.1.2 Class 2 hose assemblies shall meet the Class 1 proof pressure test requirement and shall wi
49、thstand 25% of the operating pressure listed in Table 1 without malfunction or leakage in excess of the normal effusion rate of one bubble per minute for each 25.4 mm of polytetrafluoroethylene (PTFE) hose length plus one bubble per minute for each end fitting when tested pneumatically in accordance with 4.6.2.2.3.5.2 Elongation and Contraction : The hose assemb
