SAE AS 611E-2010 Hose Assembly and Tubing Polytetrafluoroethylene Cleaning Methods for《聚四氟乙烯软管组件和软管的清洗方法》.pdf
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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 theref
2、rom, 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 2010 SAE International All rights reserved. No part of this publication ma
3、y 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: +1 724-776-4970 (outside US
4、A) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS611EAEROSPACESTANDARDAS611 REV. E Issued 1963-03 Reaffirmed 2004-07 Revised 2010-04Supersedin
5、g AS611D (R) Hose Assembly and Tubing, Polytetrafluoroethylene, Cleaning Methods for RATIONALERevision E change implements a modification to Class 0 cleaning, para 3.1.2 and 3.4.1.a. This Revision also updates and reformats the Specification. 1. SCOPE 1.1 This SAE Aerospace Standard (AS) describes c
6、leaning methods for four cleanliness levels of polytetrafluoroethylene hose assemblies and rigid tube assemblies for use in aerospace systems. 1.2 Classification Class 0 Cleaning, Hydraulic minimum thickness of 2 mil. The bag, tubing, or film shall be at least as clean as the internal surfaces of th
7、e hose assembly onto which they are installed. c. Tape Material shall be per A-A-1689 or MIL-T-22085 and is used to secure the intimate barrier bag, tubing, or film to the hose assembly. The tape may also be used to close the open ends of bags, tubing, or film when used for an outer barrier.Copyrigh
8、t SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS611E Page 4 of 11d. Bags, Tubing, and Films - Outer Barrier Outer barrier bags, tubing, and films are used as a packaging technique and are not in contac
9、t with the cleaned internal surfaces of the hose assembly. Materials may be anti-static PTFE, FEP (fluorinated ethylene-propylene), nylon, or polyethylene with a 4 mil minimum thickness (these outer barrier materials are suitable for use as an intimate barrier for Class 0 and Class I only - due to r
10、elatively low criticality of the cleaning levels). 3.2 Purging Gases Purging, drying and pressure testing of Class I, II and III hose assemblies after cleaning and prior to shipment or use of Class I, II and III hose assemblies shall be done with nitrogen in accordance with MIL-PRF-27401 or BB-N-411
11、, Type I, Class I, Grade A. Clean, dry air may also be used if its purity conforms to the requirements in specified in Table 1. TABLE 1 - PURITY REQUIREMENTS - AIR TotalHydrocarbons(PPM max) by Weightas Carbon ParticlesOver 100 m Max Grams of Water Vapor per Liter of Gas at 70 F (21.1 C) and 760 mm
12、Hg 3 0 0.0000211Equivalent Dew Point: at 760 mm Hg -63.5 F (-53 C).3.3 Handling After Cleaning 3.3.1 All hose assemblies shall be sealed immediately or as specified after the level of cleanliness is achieved and testing, inspection and drying are completed. See 3.5 for preservation requirements. 3.3
13、.2 All handling after cleaning and sealing shall be planned to maintain the clean condition of the hose assembly during the packaging, shipment and storage. Handling and preservation after cleaning shall be done in areas away from high manufacturing contamination; for example: areas of high solvent
14、use, grinding, blasting or other abrasion processes. 3.3.3 Class II hose assemblies shall be processed after cleaning in a dust control area as described in 3.3.4 or in a normal manufacturing area if hose assembly parts are sealed immediately after drying. 3.3.4 Class III hose assemblies shall be pr
15、ocessed after cleaning in a dust control area: The area shall be enclosed and kept clean from dust, dirt, oil and such contaminants. Smoking or eating shall not be allowed within the area. A slight positive air pressure shall be maintained with respect to adjacent, lesser controlled areas, the input
16、 air shall be filtered.Floor, walls and ceiling, benches and tables shall be painted or have non-dusting, non-flaking and easily cleaned surfaces.Parts and equipment not related to the work function shall be kept from the work area. 3.4 Cleaning Procedures 3.4.1 Class 0 Cleaning Hose assemblies for
17、use in hydraulic and other general purpose applications (that require minimum cleaning) shall be cleaned in the following manner: Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS611E Page 5 of
18、11a. Immerse or flush the hose assemblies, using a suitable cleaning solution in accordance with 3.1.2, 3.1.3 or 3.1.4. b. If using 3.1.4 fluids other than organic solvents, rinse inside surfaces thoroughly with 3.1.2 water. c. Drain hose assemblies and blow dry with shop air. Gas in accordance with
19、 3.2 may be used instead of or in addition to shop air. d. See Section 4 and Table 4 for Quality Assurance Provisions. Accepted hose assemblies shall be preserved for shipment per 3.5. 3.4.2 Class I Cleaning Hose assemblies for use in hydraulic and/or other systems where a moderate degree of cleanli
20、ness is required shall be cleaned in the following manner: a. Prior to assembly, all fittings shall be cleaned with a 3.1.3 or 3.1.4 fluid. If using 3.1.4 fluids other than organic solvents, follow with a thorough water rinse per 3.1.2. Dry with purging gas in accordance with 3.2 or by heating for 6
21、0 min at 250 to 275 F (121 to 135 C) in a suitably designed oven. b. Immerse or flush hose assemblies in a cleaning fluid in accordance with 3.1.3 or 3.1.4 and brush bore of fittings and first inch of hose with a nylon or similar synthetic bristle brush with a diameter at least 0.06 in (1.59 mm) lar
22、ger than the fitting bore. For hose sizes -08 and smaller, the brush size may be reduced but must be greater than hose bore. The brush should have a corrosion resistant core. On hose assemblies incorporating tight elbow end fittings, the brushing operation may be eliminated. c. Subject hose assembly
23、 to a flood of cleaning fluid in accordance with 3.1.3 or 3.1.4 through the bore of the hose assembly for a minimum of 1 min. d. If using 3.1.4 fluids other than organic solvents, rinse inside surfaces thoroughly with 3.1.2 water. e. Dry the hose assembly with purging gas in accordance with 3.2 both
24、 internally and externally (the external drying need not coincide with that for internal surface) for a minimum of 1 min or by heating for 45 min (minimum) at 250 to 275 F (121 to 135 C) in a suitably designed oven. f. See Section 4 and Table 4 for Quality Assurance Provisions. Accepted hose assembl
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