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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication m
3、ay 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: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AS85421 REV. A AEROSPACE STANDARD Issued 1998-07 Revised 2007-01 Superseding AS85421 (R) Fittings, Tube, Fluid Systems, Separable, Beam Seal, 3000/4000 psi, General Specification For FSC 4730 RATIONALE This Standard
5、is revised to include PRI-QPL requirements and to establish PRI-QPL-AS85421 1. SCOPE 1.1 Scope This specification covers the design requirements and test procedures for separable beam seal fittings which includes end fittings (see 2.3.3), fitting bodies (see 2.3.6), and boss fittings (see 2.3.1) for
6、 use in aerospace fluid systems. Design requirements are for class 3000 in corrosion resistant steel (CRES) only and for class 4000 in titanium alloy (Ti) only. Definition of fittings and related terms are defined in 2.3. 1.2 Classification Fittings shall be of the following type and pressure classe
7、s of the hydraulic system as specified below: 1.2.1 Type As defined in hydraulic system specifications AS5440 and AS8775. a. Type II System - Temperature range -65 to +275 F (-54 to +135 C). 1.2.2 Pressure Classes a. Class 3000 - 3000 psi (21,000 kPa) nominal operating pressure where the cutout pres
8、sure at the main pressure controlling device is 3000 psig (21,000 kPa). b. Class 4000 - 4000 psi (28,000 kPa) nominal operating pressure where the cutout pressure at the main pressure controlling device is 4000 psig (28,000 kPa). Copyright SAE International Provided by IHS under license with SAENot
9、for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS85421 Revision A - 2 - 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to the extent specified herein. The latest issue of SAE publication shall apply. The applicable i
10、ssue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and the references cited herein, the text of this document takes precedence Nothing in this document however, supersedes applicable laws and regulatio
11、ns unless a specific exemption has been obtained. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. ARP603 Hose, Hydraulic, Tubing Aircraft, Missile and Ord
12、nance MIL-L-46010 Lubricant, Solid Film, Heat Cured, Corrosion Inhibiting MIL-PRF-83282 Hydraulic Fluid, Fire-Resistant, Synthetic Hydrocarbon Base, Aircraft, Metric, NATO Code Number H-537 MIL-HDBK-505 Definitions of Item Levels, Item Exchangeability, Models and Related Terms MIL-STD-1916 DoD Prefe
13、rred Method for Acceptance of Product MIL-STD-2073-1 DoD Standard Practice for Military Packaging Requirements 2.1.3 ASME Publications Available from ASME, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org. ASME B46.1 Surface Texture ASME Y14.35M Provision Engine
14、ering Drawing and Associated Documents 2.1.4 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM D 1974 Fiberboard Shipping Containers, Methods of Closing, Sealing, and Reinforcing, Standard Practice for
15、ASTM D 3951 Packaging, Commercial ASTM D 6251 DoD Preferred Method for Acceptance of Product 2.1.5 PRI Publications Available from PRI, 161 Thornhill Road, Warrendale, PA 15086-7527, Tel: 724-772-1616, www.pri-network.org. PD2001 Tasks & Procedures of the Qualification Product Management Council PD2
16、101 Qualified Management Product Council for Qualified Products Groups PD2101 Qualified Management Product Council for Qualified Products Group AS7112 National Aerospace and Defense Contractors Accreditation Program (Nadcap) - Fluid Systems Components Manufacturing Requirements AS7112/2 National Aer
17、ospace and Defense Contractors Accreditation Program Requirements for Fittings and Other Machined Components AS9100 Quality Systems - Aerospace Model for Quality Assurance in Design, Development, Production, Installation and Servicing Copyright SAE International Provided by IHS under license with SA
18、ENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS85421 Revision A - 4 - 2.2 Other Referenced Publications The documents below are referenced in Section 1 for information only and not part of the requirements called out in the body of the standard. AS5440 Hydr
19、aulic Systems, Aircraft, Design and Installation Requirements For AS8775 Hydraulic System Components, Aircraft and Missiles, General Specification For 2.3 Definitions 2.3.1 BOSS FITTING Boss fitting as used herein is defined as the fitting that connects to AS5202, AS1300 ring-locked type boss or equ
20、ivalent. 2.3.2 CONNECTOR Connector as used herein is defined as a replaceable component which connects end fittings, bosses or ports by means of threads. Generally these components are end fittings with internal or external threads and fitting bodies. 2.3.3 END FITTING End fitting as used herein is
21、defined as fitting permanently attached to tubing end. An end fitting with an internally threaded nut is defined as a female end fitting. An end fitting with an externally threaded end is defined as a male end fitting. 2.3.4 FAILURE Failure as used herein is defined as any deformation that would con
22、tribute to seal leakage or would promote premature fatigue breakage, unless otherwise determined to be due to a tubing defect. 2.3.5 FITTING ASSEMBLY Fitting assembly as used herein is defined as the end fittings attached to the appropriate tubing with necessary connectors to conform to proper test
23、sample (see 4.3.1 and Table 4). 2.3.6 FITTING BODY Fitting body as used herein is defined as a replaceable component which connects male or female end fittings, bosses, or ports by means of threads. Generally these fittings are unions, adapters, 45 and 90 degree elbows, tees, and crosses. 2.3.7 LEAK
24、AGE Leakage as used herein is defined as the escape of fluid (gaseous or liquid) from any point of the fitting assembly including the fitting-tube junction. This junction is defined to include one tube outside diameter in length beyond the fitting envelope. The envelope is the area from free parent
25、tube material to free parent tube material or boss. 2.3.8 LOT A lot is defined as parts consist of all parts of a given part number made from the same batch of material and processed at the same time. 2.3.9 TORQUE Torque as used herein is defined as the necessary loads (or assembly stresses) to ensu
26、re the sealing of the end fitting of the fitting body. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS85421 Revision A - 5 - 3. TECHNICAL REQUIREMENTS 3.1 Qualification The fittings and fittin
27、g bodies furnished under this specification shall be products which are authorized by the qualifying activity for listing on the applicable qualified products list at the time of award of contract (see 4.3 and 6.5). 3.1.1 Product Qualification Fittings, nuts and sleeves furnished under this specific
28、ation shall be representative of products which have been qualified to the requirements of 4.3. All products shall conform to this procurement specification and shall be approved in accordance with the requirements of PD2001 and PD2101 for listing in the PRI Qualified Products List (QPL) PRI-QPL-AS8
29、5421 (http:/www.pri.sae.org/QPL/qpl-list.htm). 3.1.2 Manufacturer Qualification A manufacturer producing a product in conformance to this procurement specification shall be accredited in accordance with the requirements of PD2101, AS9100, AS7112 and AS7112/2 and will be listed in the PRI Qualified M
30、anufacturers List (QML) 3.2 Material 3.2.1 Fittings The material used shall be titanium alloys and corrosion resistant steels as specified in Table 1. The corrosion resistant steel fittings are designed for class 3000 system. The titanium fittings are designed for class 4000, but may be used in both
31、 class 3000 and class 4000 systems. The material shall be heat treated, as required, and have surface protection to meet the test requirements of this specification. Recycled materials shall be utilized to the maximum extent possible provided the materials used conform to the applicable material spe
32、cifications. 3.2.2 Tubing The tubing used for the fabrication of the test fitting assemblies shall be in accordance with Tables 1 and 2. TABLE 1 - FITTING AND TUBING MATERIALS Item Name Titanium (Class 4000) CRES (Class 3000) Nuts Internally Threaded AMS 4965 AMS 5643 or AMS 5659 Condition H1075 Fit
33、ting Bodies AMS 4965, AMS 4928, AMS 4921 AMS 5643 or AMS 5659 Condition H1075 or AMS 5656 Tubing AMS 4946 AMS 5561 Swivel Wires AMS 5637 Protected with Solid Film Lubricant per MIL-L-46010 Type I Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or netwo
34、rking permitted without license from IHS-,-,-SAE AS85421 Revision A - 6 - TABLE 2 - FITTING AND TUBING DATA AND STRESS LEVEL FOR FLEXURE TEST Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS854
35、21 Revision A - 7 - 3.3 Design and Construction 3.3.1 Configuration and Dimensions The configuration and dimensions shall conform to requirements of this document and the design requirements specified on the applicable specification sheets of AS85421/1 through AS85421/17. 3.3.2 Drill Offset On fitti
36、ngs where the fluid passage is drilled from each end, the offset between the drilled holes at the meeting point of the drills shall not exceed 0.015 inch (0.4 mm). Angular misalignment shall not exceed two degrees. 3.3.3 Reduction in Fluid Passage (Bore) Cross-Section Straight and nonreducer shape f
37、ittings shall be bored through out the passage such that a ball having a diameter, 0.020 inch (0.5 mm) less than the minimum specified bore shall pass through the passage. For nonstraight and nonreducer shape fittings (such as crosses, tees, elbows, etc.) the cross-sectional area at the junction of
38、the fluid passage shall not be smaller than the cross-sectional area of the smallest passage. 3.3.4 Tube Attachment The method of joining the tubing to the end fitting (brazing, welding, mechanical attachment, swaging, etc.) shall not adversely affect the properties, strength, or geometry of tubing
39、or end fitting. The joint shall be of a quality compatible with the design and performance requirements of this specification and shall permit inspection by direct measurement, X-ray, or other means. 3.3.5 Installation Tooling Size of tool envelope required to install fittings on tubing in aircraft
40、shall be kept to a minimum. The wrench flats or pads of the fittings shall permit use of standard wrenches. 3.3.6 Fitting Body Design Fitting body shall be designed to prevent failure (see 6.10.4) of sealing surfaces. The sealing interface shall be integral with the fittings. Removable seals are not
41、 permitted. Prior to assembly, the female nut shall be pulled back in such position that the threaded end of the nut is flush within 0.0625 inch (1.59 mm) of the outer beam surface. When assembled the fitting body to maximum torque (see 6.10.9) the gap between the threaded end of the nut and hex fac
42、e of the male fitting body shall be a minimum of 0.030 inch (0.8 mm). 3.3.7 Fitting Body Interface All male and female end fittings shall be tested using fitting bodies with end configurations conforming to the design standards AS85421/1 and AS85421/2. All male fitting bodies tested shall be interch
43、angeable with male fitting bodies dimensioned as shown in the design standards. 3.3.8 Threads All threads shall be in accordance with AS8879. The surface finish of the thread flanks shall be 63 microinches Ra per ASME B46.1. Internal threads shall be coated with solid film lubricant per MIL-L-46010,
44、 Type I. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS85421 Revision A - 8 - 3.4 Performance The fitting assemblies (see 6.10.5) shall meet the performance requirements of 3.5.1 through 3.5.
45、8. 3.4.1 Proof Pressure The fitting assembly shall withstand pressure equal to twice the nominal operating pressure of the system for 5 minutes without leakage, evidence of permanent deformation, or other malfunction that shall affect assembly or disassembly using the torque values per Table 3 when
46、tested in accordance with 4.6.2. TABLE 3 - TORQUE REQUIREMENTS Fitting Size 03 04 05 06 08 10 12 14 16 20 24 in-lb 97 151 173 270 432 594 756 918 1242 1512 1620 Minimum Torque N-m 11 17 20 31 49 67 85 104 140 171 183 in-lb 108 168 192 300 480 660 840 1020 1380 1680 1800 Maximum Torque N-m 12 19 22 3
47、4 54 75 95 115 156 190 203 3.4.2 Burst Pressure The fitting assembly shall not rupture or leak (no more than allowable) at any pressure less than or equal to four times the nominal operating pressure. The test shall be conducted in accordance with 4.6.3 for a minimum of 5 minutes at burst pressure.
48、The fitting assembly shall not have to meet any disassembly or assembly requirements after this test. 3.4.3 Thermal Shock The fitting assembly shall withstand the temperature and pressure when tested in accordance with 4.6.4 without leakage, evidence of permanent deformation, or other malfunction that shall affect assembly or disassembly of the fitting. 3.4.4 Impulse The fitting assembly shall withstand 200,000 impulse pressure cycles without leakage (see 2.3.7) from the fitting or the fitting-tube junction when tested in accordance with 4.6.
