1、AEROSPACERECOMMENDED PRACTICE ARP1658 REV. B Issued 1982-03 Revised 1997-08 Reaffirmed 2014-10 Superseding ARP1658A Hose Assemblies, Installed, Visual Inspection Guide For RATIONALE ARP1658B has been reaffirmed to comply with the SAE five-year review policy. _ SAE Technical Standards Board Rules pro
2、vide 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 u
3、ser.” 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 in a
4、 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 Email:
5、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/ARP1658B 1. SCOPE:This SAE Aerospace Recommended Practice (ARP) covers visible surface defects on aerospace hose assemblie
6、s which have been installed and are functioning within a working environment at the time of visual inspection.1.1 Purpose:This document is intended to help those who are conducting periodic visual inspections of hose assemblies used in aerospace systems and ground servicing equipment to determine ti
7、me for replacement by condition of hose assemblies at time of inspection. This practice is intended to augment existing procedures for replacement of hose assemblies based on service time.1.1.1 A constant surveillance of all hose assemblies for visible wear, defects, and/or damage shall be routine a
8、t all times of maintenance. When wear, defects, or damage to installed hose assemblies is detected, the hose assemblies shall be tagged or replaced in accordance with Section 4 of this document.2. REFERENCES:2.1 Related Publications:The following publications are provided for information purposes on
9、ly and are not a required part of this document.2.1.1 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.FED-STD-162a Hose, Rubber, Visual Inspection GuideMIL-STD-177 Rubber Products, Terms for Visible Defects
10、 ofMIL-STD-407 Visual Inspection Guide for Rubber Molded Products2.1.2 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AIR4092 Investigation of PTFE “Melt“ Phenomenon for High Pressure Hoses2.2 Definitions:The following terms defining types of visible defects
11、on installed hose assemblies shall apply specifically to this document.ABRASION: The wearing away by friction, especially hose cover or reinforcement which evidence damage, fraying, etc., due to rubbing or vibrating against another hose or permanent fixture in an installation.BROKEN CLAMPS: Loose, b
12、roken, or damaged firesleeve clamps which evidence a failure to prop-erly secure firesleeving to a hose assembly.BROKEN WIRES: On hose with wire-braided jacket or cover, a strand of wire, or multiple strands of wire forming a plait, which is severed or broken in two due to abrasion, flexing or stres
13、s fatigue.CHALKING: The formation of a powdery surface condition due to disintegration of firesleeving or hose cover material by weathering or other destructive environments.CHECKING: Short, shallow cracks on the surface of an elastomeric hose cover material resulting from damaging action of environ
14、mental conditions.CORROSION: A physical discoloration of hose cover or reinforcement indicative of material degra-dation due to extreme heat, chemical attack, weathering, oxidation, etc.COVER BLISTERS: Raised areas or spots on an elastomeric hose cover surface usually forming a void or air-filled sp
15、ace in the material.CRACKED SLEEVE: A firesleeve which evidences surface cracks or fissures caused by strain and environmental conditions.CRAZING: A surface effect on elastomeric hose cover material characterized by multitudinous minute cracks.HEAT DAMAGE: Charring, chalking, or hardening and cracki
16、ng of hose cover caused by excessive or prolonged exposure to heat. Other evidence may include fluid leakage from socket where fitting or coupling is attached to hose.KINKING: A temporary or permanent distortion of a hose, induced by winding or doubling upon itself and consequently exceeding the rec
17、ommended minimum bend radius established for that hose.SAE INTERNATIONAL ARP1658B Page 2 of 46_ 2.2 (Continued):LEAKER: (1) A crack or hole in the tube which allows fluids to escape. (2) A hose assembly which allows fluids to escape at the fittings or couplings.LOOSE COVER: A separation of the cover
18、 from the carcass or reinforcements.SOAKED SLEEVE: A firesleeve, so saturated with fluid conveyed by the hose assembly the sleeve is mounted to that sweating or permeation of the fluid through the firesleeve results. (A soaked sleeve is usually indicative of a damaged or faulty hose assembly or spil
19、lage of fluid from a nearby port.)TEARS: A sharp break or fissure in the surface of a hose cover, generally caused by strain and ser-vice conditions.TORN SLEEVE: A firesleeve which evidences surface tear, or which has been stretched in two or fis-sured to the degree that it will no longer provide ad
20、equate fire protection to the hose assembly.TWIST: A hose or hose assembly subjected to internal pressures or improperly installed so that each end of the hose is turned awkwardly about the hose axis in opposing directions.WEATHERING: The surface deterioration of a hose cover during outdoor exposure
21、, such as check-ing, cracking, crazing, or chalking.WIRE THROW-OUT: In braided hose, a broken end or ends in the wire reinforcements protruding from the surface of the braid.3. REQUIREMENTS:The following inspection procedure shall be in effect commencing with the receipt of equipment, containing hos
22、e assemblies, by the user.3.1 Inspection Records:Appropriate work orders, job sheets, Technical Orders (T.O.s) and maintenance service records shall contain requirements for visual hose inspection and sign-off indicating that the inspections were made.3.2 Frequency of Inspections:3.2.1 Routine Visua
23、l Inspection: Shall be made on all exposed hose assemblies each time the equipment is serviced.3.2.2 Complete Visual Inspection: Shall be made at users approved schedule (recommend inspection twice annually).SAE INTERNATIONAL ARP1658B Page 3 of 46_ 3.3 Inspection Procedures:3.3.1 Routine Visual Insp
24、ection: Shall consist of a constant surveillance of those hose assemblies exposed during routine servicing of the equipment. The operator or mechanic is to look for visible evidence of leakage, wear, damage, or abuse and replace in accordance with classification of defects (see Section 4).3.3.2 Comp
25、lete Visual Inspection: Shall consist of a thorough examination of all hose assemblies on the equipment. The operator or mechanic shall trace through the entire system examining the hose assemblies for evidence of leakage, wear, damage, or abuse and replace in accordance with classification of defec
26、ts (see Section 4).3.3.3 Disposition of Defective Assemblies: When leaky, worn, damaged, or abused hose assemblies are found, they shall be tagged or replaced if necessary and the cause shall be corrected or eliminated. A full report shall be made so that similar equipment may likewise be corrected.
27、4. CLASSIFICATION OF DEFECTS:Defects observed shall fall into two classifications, minor and major.4.1 Minor Defects:Minor defects, when observed, should be tagged for future observations and/or replacement.4.2 Major Defects:Major defects should be replaced immediately.5. IDENTIFICATION OF DEFECTS:5
28、.1 Kinked:Minor: In body of low pressure hose.Major: If near fitting, indicating possible heavy stress, or in medium or high pressure hose assemblies.5.2 Broken Wires:Minor: If isolated random occurrence.Major: If two or more wires in one plait broken (see 2.2), or if breakage of several wires is co
29、ncentrated in one section.SAE INTERNATIONAL ARP1658B Page 4 of 46_ 5.3 Abrasion:Minor: If confined to no more than two wires.Major: If extended throughout one plait or from one plait to another.Minor: For rubber covered hose if confined to rubber cover of hose.Major: For rubber covered hose if wire
30、is exposed.Minor: Para-aramid reinforced hose if straw colored reinforcement is not exposed.Major: Para-aramid reinforced hose if straw colored reinforcement is exposed.5.4 Corrosion:Minor: A discoloration of the hose cover or reinforcement but no physical corrosion is detectable.Major: If any corro
31、sion of wire is detectable.5.5 Twisted:Minor: On all spirally reinforced hose.Major: If wires are broken or liner cannot be rounded out.5.6 Cracked Firesleeve (Integral):Minor: If only surface crazing and no excessive hardening.Major: If hose exposed or if significant hardening (correct cause of app
32、arent over temperature exposure).5.7 Wetted Firesleeve:Minor: Light intermittent external surface only.Major: If fiberglass wetted or if sleeve (integral or slip-on) is submerged.5.8 Torn Firesleeve (Slip-On):Minor: Shallow superficial tear with no material missing.Major: If fiberglass is exposed.SA
33、E INTERNATIONAL ARP1658B Page 5 of 46_ 5.9 Broken Clamps:Minor5.10 Leakers:Minor: A leak which can be stopped by tightening a loose swivel nut. Any leak that can be stopped by tightening swivel nut to maximum recommended torque.Major: A tear or defect in the hose assembly or fitting causing a leak.
34、Any leak that cannot be overcome by tightening swivel nut or retaining bolts (flange) to maximum recommended torque.5.11 PTFE “Melt“ Phenomenon:Minor: NoneMajor: Visible signs of PTFE material, typically “whisker“ like appearance, leaching past reinforcement wire braid.6. NOTES:6.1 Key Words:Aerospa
35、ce, hose assemblies, defect, visual inspection6.2 The change bar ( l ) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document ti
36、tle indicates a complete revision of the document.PREPARED BY SAE SUBCOMMITTEE G-3D, AEROSPACE HOSE OF COMMITTEE G-3, AEROSPACE COUPLINGS, FITTINGS,HOSE, AND TUBING ASSEMBLIESSAE INTERNATIONAL ARP1658B Page 6 of 46_ FIGURE 1 - Pictorial Reference by Hose Type and DefectsSAE INTERNATIONAL ARP1658B Pa
37、ge 7 of 46_ FIGURE 2 - Kinked Assemblies - Minor and MajorLow Pressure Rubber Hose (MIL-H-5593)SAE INTERNATIONAL ARP1658B Page 8 of 46_ FIGURE 3 - Kinked Assemblies - Minor and MajorMedium Pressure Rubber Hose With Fabric Cover (MIL-H-8794)FIGURE 4 - Kinked Assemblies - Minor and MajorMedium Pressur
38、e Rubber Hose With Stainless Steel Reinforcement (MIL-H-83797)SAE INTERNATIONAL ARP1658B Page 9 of 46_ FIGURE 5 - Kinked Assemblies - Minor and MajorLow and Medium Pressure PTFE Hose (MIL-H-25579/MIL-H-27267, AS620, AS1227, or AS1946)FIGURE 6 - Abrasion - Minor and MajorLow Pressure Rubber Hose (MIL
39、-H-5593)SAE INTERNATIONAL ARP1658B Page 10 of 46_ FIGURE 7 - Abrasion - Minor and MajorMedium Pressure Rubber Hose With Fabric Cover (MIL-H-8794)SAE INTERNATIONAL ARP1658B Page 11 of 46_ FIGURE 8 - Abrasion - Minor and MajorMedium Pressure Rubber Hose With Stainless Steel Reinforcement (MIL-H-83797)
40、SAE INTERNATIONAL ARP1658B Page 12 of 46_ FIGURE 9 - Abrasion - Minor and MajorHigh Pressure Rubber Hose With Rubber Cover (MIL-H-8788)SAE INTERNATIONAL ARP1658B Page 13 of 46_ FIGURE 10 - Abrasion - Minor and MajorLow and Medium Pressure PTFE Hose (MIL-H-25579/MIL-H-27267, AS620, AS1227, or AS1946)
41、SAE INTERNATIONAL ARP1658B Page 14 of 46_ FIGURE 11 - Abrasion - Minor and MajorHigh Pressure PTFE Hose, Metallic Reinforced(MIL-H-38360, AS604, AS614, AS1339, AS4098, or AS4604)SAE INTERNATIONAL ARP1658B Page 15 of 46_ FIGURE 12 - Weathering - Minor and MajorLow Pressure Rubber Hose (MIL-H-5593)SAE
42、 INTERNATIONAL ARP1658B Page 16 of 46_ FIGURE 13 - Weathering - Minor and MajorHigh Pressure Rubber Hose With Rubber Covering (MIL-H-8788)SAE INTERNATIONAL ARP1658B Page 17 of 46_ FIGURE 14 - Heat Cracking - Minor and MajorLow Pressure Rubber Hose (MIL-H-5593)SAE INTERNATIONAL ARP1658B Page 18 of 46
43、_ FIGURE 15 - Leaker - Minor and MajorLow Pressure Rubber Hose (MIL-H-5593)SAE INTERNATIONAL ARP1658B Page 19 of 46_ FIGURE 16 - Leaker - Minor and MajorMedium Pressure Rubber Hose With Fabric Cover (MIL-H-8794)SAE INTERNATIONAL ARP1658B Page 20 of 46_ FIGURE 17 - Leaker - Minor and MajorMedium Pressure Rubber Hose With Stainless Steel Reinforcement (MIL-H-83797)SAE INTERNATIONAL ARP1658B Page 21 of 46_
