SAE-AS-4388-1991-R2007.pdf
AEROSPACE STANDARD AS4388 Issued1991-12 Reaffirmed2007-08 Hose Assembly PTFE Heavy Duty, -65 To 400 °F (-55 To 204 °C) 8000 psi (56 000 kPa) Hydraulic and Pneumatic 1.SCOPE: This Aerospace Standard (AS) defines the requirements for polytetrafluoroethylene (PTFE) heavy duty hose assemblies suitable for use in aircraft and missile hydraulic fluid systems service to 8000 psi and -65 to 400 °F. Gaseous service shall be limited to 150 °F. 2.REFERENCES: 2.1Applicable 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 of other documents shall be as specified in AMS 2350. 2.1.1SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. AMS 3380Hose, Polytetrafluoroethylene, TFE Fluorocarbon Resin, Wire Braid Reinforced AMS 4928Ti Alloy Bars, Forgings and Rings, 6Al - 4V, Anneal 120,000 psi AMS 4944Ti Alloy Tubing, Seamless Hydraulic 3.0Al - 2.5V Cold-Worked, Stress Relieved AMS 4945Titanium Alloy Tubing, Seamless, Hydraulic 3Al - 2.5V, Texture Controlled, 105,000 psi Yield Strength AMS 4965Ti Alloy Bars, Forgings and Rings, 6Al - 4V, Solution and Precipitation Heat Treated AMS 5536Steel Bars, Corrosion-Resistant, 18Cr - 8.5Ni (SAE 30302) Cold Drawn, 100,000 psi (690 MPa) AMS 5556Steel Tubing, Seamless or Welded, Corrosion and Heat-Resistant 18Cr - 11Ni - (Cb + Ta) (SAE 30347) Hydraulic AMS 5557Steel Tubing, Seamless and Welded, Corrosion and Heat-Resistant 18Cr - 11Ni-Ti (SAE 30321) Hydraulic RATIONALE This document has been reaffirmed to comply with the SAE 5-Year Review policy. 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 therefrom, 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 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: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:38:37 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4388 - 2 - 2.1.1 (Continued): AMS 5561Steel Tubing Welded and Drawn, 9.0Mn - 20Cr - 6.5Ni - 0.28N, High Pressure Hydraulic AMS 5567Steel Tubing, Seamless and Welded, Corrosion-Resistant 19Cr - 10Ni (SAE 30304) Hydraulic, Solution Treated AMS 5570Steel Tubing, Seamless, Corrosion and Heat-Resistant 18Cr - 11Ni - 0.40Ti (SAE 30321) AMS 5571Steel Tubing, Seamless, Corrosion and Heat-Resistant 18Cr - Ni - 0.70 (Cb + Ta) (SAE 30347) AMS 5575Steel Tubing, Welded, Corrosion and Heat-Resistant 18Cr - 10.5Ni - 0.70 (Cb + Ta) (SAE 30347) AMS 5576Tubing Welded, 18Cr - 10.5Ni - 0.40Ti Solution Heat Treated AMS 5637Steel Bars, Corrosion-Resistant, 18Cr - 10Ni (SAE 30304) AMS 5639Steel Bars, Forgings, Tubing, and Rings, Corrosion-Resistant 19Cr - 10Ni (SAE 30304) AMS 5643Steel Bars, Forgings, Tubing and Rings, Corrosion-Resistant 16.5Cr - 4.0Ni - 4.0Cu AMS 5644Steel Bars and Forgings, Corrosion and Heat-Resistant 17Cr - 7Ni - 1Al AMS 5645Steel Bars, Forgings, Tubing and Rings, Corrosion and Heat-Resistant, 18Cr - 10Ni - 0.40Ti (SAE 30321) AMS 5646Steel Bars, Forgings, Tubing and Rings, Corrosion and Heat-Resistant, 18Cr - 11Ni - 0.60 (Cb + Ta) (SAE 30347) AMS 5647Steel Bars, Forgings, Tubing and Rings, 18Cr - 8Ni AMS 5659Steel Bars, Forgings and Rings, Corrosion-Resistant 15Cr - 4.5Ni - 0.30 (Cb + Ta) - 3.5 Consumable Electrode Melted AMS 5743Steel Bars and Forgings, Corrosion and Moderate Heat-Resistant 15.5Cr - 4.5Ni - 2.9Mo - 0.10N, Solution Heat-Treated, Sub-Zero Cooled, Equalized and Over-Tempered ARP603Impulse Testing of Hydraulic Hose Assemblies, Tubing and Fittings AS611Tetrafluoroethylene Hose Assembly Cleaning Methods AS1055Fire Resistance and Fire Test ARP1153Method for Determining Relative Specific Gravity, Polytetrafluoroethylene Tubing AIR1228Standard Impulse Machine Equipment and Operation ARP1835Preparation for Delivery, General Requirements for Hose Assemblies AS2078Test Methods, Hose Assemblies PTFE (in process) 2.1.2ASTM Publications: Available from American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103. ASTM A 262Detecting Susceptibility to Intergranular Attack on Stainless Steel ASTM A 313Chrome Nickel Stainless and Heat-Resistant Steel - Spring Wire ASTM D 412Rubber, Determination of Tension Characteristics Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:38:37 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4388 - 3 - 2.1.2 (Continued): ASTM A 580Stainless and Heat-Resistant Steel Wire - Type 304 or 316, Condition B ASTM 644Sodium Chloride Reagent Grade ASTM D 792Specific Gravity and Density of Plastics by Displacement ASTM D 1457TFE - Fluorocarbon Resin Molding and Extrusion Materials 2.1.3U.S. Government Publications: Available from Standardization Document Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094. QQ-S-763Steel Bars, Wire Shapes and Forgings, Corrosion-Resisting MIL-F-8815Filter and Filter Elements, Fluid Pressure, Hydraulic Line, 15 Micron Absolute and 5 Micron Absolute, Type ID Systems MIL-F-85720Fittings, Tube, Fluid Systems, Separable, High Pressure Dynamic MIL-F-85720/1Fittings, Tube, Fluid Systems, Separable, High Pressure, Dynamic Beam Seal, Design Standard for Male End MIL-F-85800Hose Assemblies, Tetrafluoroethylene, Aramid Fiber Reinforced MIL-H-5606Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance MIL-H-83282Hydraulic Fluid, Fire-Resistant, Synthetic Hydrocarbon Base Aircraft MIL-L-7808Lubricating Oil, Aircraft Turbine Engine, Synthetic Base MIL-S-8879Screw Threads, Controlled Radius Root with Increased Minor Diameter MIL-T-8504Tubing, Steel, Corrosion-Resisting (304) Aerospace Vehicle Hydraulic Systems, Annealed, Seamless and Welded MIL-T-8606Tubing, Steel, Corrosion-Resistant (18-8 Stabilized and Extra Low Carbon) MIL-T-8808Tubing, Steel, Corrosion-Resistant (18-8 Stabilized) Aircraft Hydraulic Quality DOD-STD-100Engineering Drawing Practices for Inspection MIL-STD-105Sampling Procedures and Tables by Attributes MIL-STD-130Identification Marking of U.S. Military Property MIL-STD-831Test Reports, Preparation of MS19059Balls Bearing, Ferrous, Chrome Alloy Steel H4-1Cataloging Handbook (Federal Code Numbers) 3.TECHNICAL REQUIREMENTS: 3.1Qualification: The hose assemblies furnished under this document shall be products which are qualified by meeting all the requirements covered by this document. 3.2Materials: The hose assembly materials shall be uniform in quality, free from defects, consistent with good manufacturing practice, shall conform to applicable specifications and the requirements specified herein, and shall be of the highest quality and suitable for the purpose intended. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:38:37 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4388 - 4 - 3.2.1Metals: Metals used in the hose and fittings shall be corrosion-resistant and shall conform to the following specification a.Bars and Forgings: (1) QQ-S-763Class 302 - Cond. A and Cond. B (AMS 5636 and AMS 5637) (2) QQ-S-763Class 304 - Cond. A and Cond. B (AMS 5639) (3) QQ-S-763Class 304L - Cond. A (AMS 5647) (4) QQ-S-763Class 321 - Cond. A (AMS 5645) (5) QQ-S-763Class 347 - Cond. A (AMS 5646) (6) AMS 564317-4PH (7) AMS 564417-7PH (8) AMS 565915-5PH (9) AMS 5743AM-355 (10)AMS 4928Titanium 6Al 4V Annealed (11)AMS 4965Titanium 6Al 4V Heat Treated b.Tubing: (1) MIL-T-8504Comp. 304 (AMS 5567) (2) MIL-T-8505Type I, Comp. 321 (AMS 5570) (3) MIL-T-8808Type I or Type II, Comp. 321 (AMS 5557, AMS 5570, or AMS 5576) (4) MIL-T-8808Type I or Type II, Comp. 347 (AMS 5571, AMS 5575, or AMS 5556) (5) AMS 4944Titanium 3Al 2.5V Cold Worked and Stress Relieved (6) AMS 5561Welded and Redrawn Stainless Steel Tubing (7) AMS XXXXTitanium Alloy Tubing, Seamless, Hydraulic, Ti - 15V - 3.0Cr - 3.01Al - 3.0Sn, Cold Worked and Precipitation Heat Treated (8) AMS 4945Titanium Alloy Tubing, Seamless, Hydraulic, 3Al - 2.5V, Texture Controlled, 105,000 psi Yield Strength c.Wire: (1) ASTM A 580Specification for Stainless and Heat-Resisting Steel Wire, Type 304 or 316 Condition B (2) ASTM A 313Chrome Nickel Stainless and Heat-Resistant Steel - Spring Wire 3.3Construction: The hose assembly shall consist of a seamless PTFE inner tube, corrosion-resistant steel-wire reinforcement, and corrosion-resistant metal end fittings as required to meet the construction and performance requirements of this document and as required for its intended use. Assembly shall pass a ball per Table 7. 3.3.1Inner Tube: The inner tube shall be of a seamless construction of virgin PTFE resin of uniform gauge. It shall have a smooth bore and shall be free from pitting, deep scratches, or projections on the inner surface. Additives may be included in the compound from which the tube is extruded. The inner tube will be conductive per 3.5.2.13. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:38:37 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4388 - 5 - 3.3.2Reinforcement: 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 herein. Broken reinforcing wires shall be cause for rejection. Crossed-over reinforcing wires shall not be cause for rejection of the hose assembly. 3.3.3Interlayers: Interlayers, if used, shall be of a suitable material and shall be resistant to pressure pounding and to all fluids with which the hose may come in contact during normal service. They shall be capable to withstanding temperatures of -65 to 400 °F and shall not extrude through the outer braid during testing or in service. 3.3.4Fittings: All fittings shall be proven to meet the requirements herein. Standard hose assemblies shall have reconnectable configuration of beam seal fittings per MIL-F-85720 to mate with MIL-F- 85720/1. Fitting hex portions shall fit standard wrench openings. 3.3.4.1Straight Fittings: Straight fittings shall be of one piece construction. Weld or braze joints must not be located in the fluid paths. 3.3.4.2Other Fittings: Other fittings including elbow fittings shall be of one piece construction to the maximum extent possible. However, those made with other than one piece construction can use stainless steel welded and redrawn tubing per AMS 5561 or titanium seamless tubing per AMS 4944 or AMS 4945. When weld joints are required the butt weld method will be used. 3.3.4.3End Fitting Collars (Sockets): All end fitting collars (sockets) crimped or swaged, fabricated from Type 304 stainless steel are required to be capable of passing an embrittlement test as specified in ASTM A 262 Practice E, prior to assembly to the nipple or the swaging or crimping operation. Sockets fabricated from stabilized austenitic steel (304L, 321, or 347) are acceptable without being subjected to the embrittlement test. Titanium sockets are not recommended. 3.4Dimensions: The hose assembly dimensions, except for length, shall be as specified in Figure 2 and Table 6. 3.4.1Hose Weight: Hose consisting of inner tube, reinforcement, and interlayers as outlined in 3.3.1 through 3.3.3 shall not exceed the maximum hose weights covered in Table 1A. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:38:37 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4388 - 6 - TABLE 1 - Physical and Pressure Requirements 3.5Performance: The hose assembly shall meet the following performance requirements: 3.5.1Tube: 3.5.1.1Tube Roll and Proof Pressure Test: The tube shall not leak, split, burst, or show any evidence of malfunction, when rolled to the Table 4 flattening and rounding gaps. Test method is specified in 4.6.2.1. 3.5.1.2Tube Proof Pressure: The tube, without reinforcing wires, shall not leak, burst, or show any evidence of malfunction when held at the Table 4 proof pressure values for 1 min. The test method is specified in 4.6.2.1. 3.5.1.3Tensile Strength: The longitudinal tensile strength for all sizes of tubes shall be 2200 psi minimum at 77 °F ± 2. The transverse tensile strength for sizes -10 and larger shall be 1800 psi minimum at the same temperature. For sizes -8 and smaller the transverse tensile strength need not be tested. The test method is specified in 4.6.2.2. 3.5.1.4Elongation: Elongation at 77 °F ± 2 shall be a minimum of 200%. The test method is specified in 4.6.2.3. 3.5.1.5Specific Gravity: The specific gravity values of the hose inner tube shall not exceed 2.155 apparent and 2.210 relative gravity. The test method is specified in 4.6.2.4. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:38:37 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4388 - 7 - 3.5.2Hose Assembly: The hose, complete with reinforcing wires and assembled with end fittings, shall meet the following performance requirements: 3.5.2.1Proof Pressure: The hose assembly shall withstand the proof pressure listed in Table 1 without malfunction or leakage. The test method is specified in 4.6.3. 3.5.2.2Elongation and Contraction: At 8000 psi the hose assembly shall not change in length by more than ±0.20 in, in 10 in of hose length, when subjected to pressure for a minimum of 5 min. The test method is specified in 4.6.4. 3.5.2.3Volumetric Expansion:
