1、AEROSPACEINFORMATION REPORTAIR1569 REV. AIssued 1979-02 Revised 1993-09 Reaffirmed 2014-09 Superseding AIR1569 Handling and Installation Practice for Aerospace Hose Assemblies RATIONALE AIR1569A has been reaffirmed to comply with the SAE five-year review policy. _ SAE Technical Standards Board Rules
2、 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 therefrom, is the sole responsibility of t
3、he 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 2014 SAE International All rights reserved. No part of this publication may be reproduced, stored
4、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: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Ema
5、il: 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/AIR1569A FOREWORDThis SAE Aerospace Information Report (AIR) is being issued by the SAE G-3 Committee as a guide for t
6、he aerospace industry. It is felt that because of the lack of published information regarding the selection, care, handling, installation, and maintenance of hose assemblies in aerospace installations; a guide of this type is a necessity.1. SCOPE:This AIR can be used for the selection, care, handlin
7、g, installation, and maintenance of hose assemblies for aerospace fluid systems. AIR797 lists characteristics of military and SAE hose, hose assemblies, and sleeves as a selection guide.1.1 Purpose:SAE has published this AIR containing information accumulated on civilian and military aerospace fluid
8、 systems as a service to all organizations, government agencies, and individuals interested in aviation, as well as to the aircraft designer and maintenance personnel, toward whom the information is specifically directed. This material has been presented in concise indexed form to serve as ready ref
9、erence material and to provide background information for the designer, and as a guide for the maintenance of hose assemblies on aerospace fluid systems.2. REFERENCE DOCUMENTS:2.1 SAE Publications:Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096.AS604 Hose Assembly, PTFE, 400 F, 3000
10、 psi, Hydraulic HeavyweightAS611 Tetrafluoroethylene Hose Assembly Cleaning MethodsAS614 Hose Assembly, PTFE, Heavy Duty, High Temperature, High Pressure, 4000 psi, Hydraulic and Pneumatic2.1 (Continued):AS620 High Temperature Hose Assembly, Convoluted, PTFEAIR797 Hose Characteristics and Selection
11、ChartAS824 Hose Assembly, Flexible Metal, High Pressure, High TemperatureARP908 Hose Fitting - Installation and Qualification Test Torque RequirementsARP994 Recommended Practice for the Design of Tubing Installations for Aerospace Fluid Power SystemsAS1055 Fire Testing of Flexible Hose, Tube Assembl
12、ies, Coils, Fittings, and Similar System ComponentsAS1072 Sleeve, Hose Assembly, Fire ProtectionAS1073 Sleeve, Hose Assembly, Heat ShrinkableAS1291 Sleeve, Hose Assembly, Chafe Guard, TFE or FEPAS1292 Sleeve, Hose Assembly, Chafe Guard, Butyrate CoilAS1293 Sleeve, Hose Assembly, Chafe Guard, TFE Coi
13、lAS1294 Sleeve, Hose Assembly, Chafe Guard, Nylon CoilAS1295 Sleeve, Hose Assembly, Chafe Guard, Neoprene RubberAS1297 Reducers, Pneumatic Pressure, MissileAS1298 Sleeve, Heavy Wall, Hose Assembly, Chafe Guard, TFEAS1339 Hose Assembly, PTFE, 400 F, 3000 psi, Hydraulic LightweightAS1424 Hose Assembly
14、, Metal, Medium Pressure, High TemperatureARP1897 Clamp Selection and Installation GuideAS1933 Age Control for Hose Containing Age-sensitive Elastomeric MaterialAS1975 Hose Assembly, PTFE, Aramid Reinforced, 4000 psi, Hydraulic and Pneumatic2.2 U.S. Government Publications:Available from Standardiza
15、tion Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.MIL-H-5540 Hydraulic Systems, Aircraft, Types I and II, Design and Installation Requirements forMIL-H-5593 Hose, Aircraft Low Pressure, FlexibleMIL-H-6000 Hose, Rubber (Fuel, Oil, Coolant, Water, and Alcohol)MIL-
16、H-8790 Hose Assemblies, Rubber, Hydraulic, High Pressure (3000 psi)MIL-H-8795 Hose Assemblies, Rubber, Hydraulic, Fuel and Oil ResistantMIL-H-25579 Hose Assembly, Tetrafluoroethylene, High Temperature, Medium Pressure, General Requirements forMIL-H-38360 Hose Assembly, Tetrafluoroethylene, High Temp
17、erature, High Pressure, Hydraulic and Pneumatic (Notice 1 Cancellation, see AS604/AS1339, section 2.4)MIL-H-83796 Hose Assembly, Rubber, Lightweight, Medium PressureMIL-H-85421 Fittings, Tube, Fluid Systems, Separate, Dynamic Beam SealMIL-H-85720 Fittings, Tube, Fluid Systems, Separable, High Pressu
18、re, Dynamic Beam SealMIL-H-85800 Hose Assembly, PTFE, Aramid Fiber Reinforced, 5000 and 8000 psiMIL-STD-1523 Age Control of Age Sensitive Elastomeric MaterialMS20756 Flange, Swivel, RetainingSAE INTERNATIONAL AIR1569A Page 2 of 25_ 2.2 (Continued):MS33514 Fitting End, Standard Dimensions for Flarele
19、ss Tube Connection and Gasket SealMS33515 Fitting End, Standard Dimensions for Bulkhead Flareless Tube ConnectionsMS33656 Fitting End, Standard Dimensions for Flared Tube Connection and Gasket SealMS33657 Fitting End, Standard Dimensions for Bulkhead Flared Tube ConnectionMS33786 Fitting Installatio
20、n, Flared Tube and Hose, Swivel2.3 Federal Aviation Authority - Technical Standard Orders:Available from Department of Transportation, Personal Property Operations Branch, Utilization and Storage Section, M-443.2, Washington, DC 20590.TSO-C42 Propeller Feathering Hose AssembliesTSO-C53a Fuel and Eng
21、ine Oil System Hose AssembliesTSO-C75 Hydraulic Hose Assemblies3. DESIGN INFORMATION:3.1 Selection of Type of Hose:3.1.1 Inner Tube Material: The selection of the inner tube is extremely important since it is the heart of the hose assembly. Items to consider are operating temperature range, fluid co
22、mpatibility, flexibility, resistance to permeation, resistance to flow (smoothness or friction), electrostatic dissipation, resistance to outgassing in outerspace, and the retention of these characteristics over the desired life of the hose assembly. AIR797 is an excellent reference to aid in hose s
23、election.3.1.1.1 Elastomeric Tubes: There are many types of elastomers used as inner tubes in addition to many variations of the same basic elastomers which have been compounded to produce the desired characteristics. The following are those most frequently used:a. Buna N/NBR: A synthetic rubber mat
24、erial with excellent resistance to petroleum base oils and solvents.b. Butyl/IIR: A synthetic rubber material with excellent resistance to phosphate ester base hydraulic fluids.c. Ethylene Propylene Diene/EPT or EPDM: A synthetic rubber material with excellent resistance to water base and phosphate
25、ester base hydraulic fluids (generally will operate at higher temperatures than butyl).d. Neoprene/CR: A synthetic rubber material with high abrasion resistance, good resistance to low aniline paint, oils and automotive fuels.e. Chlorinated Polyethylene/CPE: A synthetic polymer base with excellent h
26、igh temperature (300 F) properties, good to excellent resistance to most fluids commonly used in aerospace with essentially nonaging characteristics.SAE INTERNATIONAL AIR1569A Page 3 of 25_ 3.1.1.2 PTFE Tubes: With very few exceptions, it has excellent resistance to aerospace fluids over a wide temp
27、erature range. PTFE tubes are available in smooth bore and convoluted construction for maximum flexibility.3.1.1.3 Convoluted Metal Tubes: A variety of metals can be used as convoluted tubes to withstand higher temperatures than possible with other materials.3.1.2 Reinforcement: The selection of the
28、 hose reinforcing material usually is on the basis of the pressure requirements; however, in some cases other requirements dictate the selection of a variety of materials; such applications as nonconductive, high cubical expansion, corrosion resistance, flexibility, etc.3.1.2.1 Fabric Reinforcement:
29、 Many types of fabric yarns are used as reinforcement for the hose. Some of these are cotton, rayon, nylon, and polyester. Often yarns are chosen for lower pressure hoses, but they also offer good characteristics for corrosion resistance or as a nonconductor of electricity. Para-aramid is suitable f
30、or high pressure reinforcement. Most fabrics are also temperature limited, 300 F or less.3.1.2.2 Wire Reinforcement: The most common types of wire reinforcement are carbon steel and stainless steel wires. The wire reinforcement is used as either a braided configuration or as multiple spiral wraps, o
31、r as a combination of both.3.1.3 Cover: The hose cover serves to protect the hose from abrasion or other damage and, in some cases, to protect other components from abrasion. The hose covers can be provided in a number of different materials.3.1.3.1 Elastomeric Cover: Most hoses having an elastomeri
32、c inner tube use a neoprene cover because it offers both excellent abrasion protection and, when properly bonded, good corrosion protection. However, some other elastomers are used when other types of protection are more important.3.1.3.2 Fabric Cover: A common type of hose cover is a cotton braid b
33、onded and impregnated with neoprene cement. Other fabrics are sometimes used, such as rayon or polyester.3.1.3.3 Wire Cover: Many hoses and almost all PTFE hoses use the external stainless steel braid as a cover.3.1.4 Size: The internal diameter of the hose as well as the internal diameter of the fi
34、ttings (as well as elbows) should be taken into account when determining the proper size of the hose.3.1.5 Pressure: The working pressure, peak pressure, and impulse life should all be considered when determining the type of hose from the strength standpoint.SAE INTERNATIONAL AIR1569A Page 4 of 25_
35、3.2 Selection of Type of Fitting:3.2.1 Construction: The selection of the fittings to be used with the hose requires not only information about the application, but some knowledge about the wide variety of fittings that are available. Items to consider are the maximum operating temperature, fluid co
36、mpatibility, corrosion resistance, weight limitations, the overall configuration of the hose assembly; that is, the requirement for elbow type ends, and the methods of sealing the hose, fitting, and the port.3.2.1.1 Crimp Fitting: This type is sometimes called a ”permanent type” end fitting. General
37、ly, this type of fitting cannot be removed from the hose without destroying at least one component part of the fitting. The rest of the fitting can sometimes be salvaged.3.2.1.2 Swage Fitting: This type is also called a “permanent type” end fitting. It is distinguished from the crimp fitting by the
38、method of attachment to the hose.3.2.1.3 Reusable Fitting: This type is sometimes referred to as “detachable reusable” or “screw together” end fittings. As the name implies, this type of fitting can be removed from an old hose and, if in good condition, it can be reassembled on a new hose.3.2.1.4 Fi
39、eld Attachable Fittings: At times, the names “field attachable” and “reusable fitting” are used interchangeably; however, they are not always the same. In some instances, a fitting may be called “field attachable” but it may not be completely reusable. Also, a permanent type fitting may be called “f
40、ield attachable” because it can be assembled in the field with simple equipment.3.2.1.5 Method of Sealing: Various methods of sealing the hose to the end fitting are in use today. The most common type is to use various shapes of circumferential lands and grooves in the nipple portion of the fitting.
41、 Other methods are in use also so the user may evaluate the many different designs.3.2.1.6 Method of Gripping: The best method of gripping the hose with the fitting is to hold the hose reinforcement with the fitting. This is especially important in high temperature or impulsing applications.3.2.2 Ma
42、terial: The considerations for the type of fitting material should include corrosion resistance, weight, strength, operating temperature range, and fluid compatibility.3.2.2.1 Corrosion Resistance: The environment in which the hose fitting will be operating should be considered in the selection of t
43、he metals used in construction. Both the external and internal conditions should be examined. The most popular metals used are aluminum, stainless steel, carbon steel, and titanium. Corrosion protection is added as needed.3.2.2.2 Weight: One of the primary design characteristics in aircraft is low w
44、eight, and this should be of prime importance in the fitting design also. Where possible, the lighter-weight materials should be selected if they will satisfy the other requirements of strength, temperature, corrosion resistance, and fluid compatibility.SAE INTERNATIONAL AIR1569A Page 5 of 25_ 3.2.2
45、.3 Fluid Compatibility: Fitting material selection for use with system fluids should be chosen by consulting the fluid manufacturers for recommendations. Items to be considered also are other fluids that may come in contact with the external surfaces of the fitting.3.2.3 End Connection: A wide varie
46、ty of end connections are available to meet system requirements for connecting and sealing.3.2.3.1 Type of Seal: Generally, there are two types of seals used in fluid systems: an elastomeric seal and the metal-to-metal seal. These are each used in a variety of connecting devices. The elastomeric sea
47、l has temperature range limitations depending on the characteristics of the elastomer. The metal-to-metal seal is used extensively since it has a very wide temperature range of operation. It depends upon deformation of the metal to effect a seal and is very sensitive to surface finish or contaminati
48、on. Historically the two most popular metal-to-metal seals are the 37 flare and the flareless type which are both detailed in military and industry specifications. More recently metallic pressure assist lip seals have been introduced extensively on both military and commercial aircraft.3.2.3.2 Swivel Nut: The 37 flare (mates with MS33656 and MS33657) and
