SAE-AIR-825-6-2004.pdf
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1、 AEROSPACE INFORMATION REPORT On Board Oxygen Generating Systems (Molecular Sieve) 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 su
2、itability 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. Co
3、pyright 2004 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
4、 ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org Issued 2004-01 AIR825/6 FOREWORD This document is one of a set of related documents. These documents comprehensively address the “Introduction
5、to Oxygen Equipment for Aircraft“, and are referred to as slash (/) documents, rather than chapters. The documents may be obtained as a set or individually. As the field of oxygen systems for aircraft has evolved, it became cumbersome for one document to cover the full range of subject matter. The r
6、eader who is seeking overall familiarity with oxygen systems for aircraft should read all of these documents that combine to form a general reference to oxygen systems. The reader who is familiar with oxygen systems for aircraft may want to obtain only the slash documents that pertain to topics that
7、 are of specific interest. The document set is written at an introductory level, suitable for anyone who would like to understand the basics of oxygen systems in aircraft, and specifically for the engineer who has just recently been assigned to aircraft oxygen systems. Many of these documents point
8、the reader toward more detailed treatments located in other SAE documents. SAE AIR825/6 - 2 - TABLE OF CONTENTS 1. SCOPE 3 2. REFERENCES.4 2.1 Applicable Documents .4 2.1.1 SAE Publications4 2.2 Related Publications 4 2.2.1 STANAG Publications4 2.3 Abbreviations and Acronyms .4 2.4 Definitions 5 3.
9、MOLECULAR SIEVE TECHNOLOGY/PRINCIPLE FUNCTION6 3.1 Molecular Sieve Technology6 3.1.1 Pressure Swing Adsorption (PSA).7 3.1.2 Maximum Oxygen Concentration and Purity Standard8 3.2 OBOG-Molecular Sieve Systems.9 3.2.1 On-line OBOGS .9 3.2.2 Replenishment OBOGS-Molecular Sieve 11 3.2.3 Oxygen Purity an
10、d Concentration, OBOG-Molecular Sieve.12 3.3 Reliability Issues in OBOGS Design, Lessons learned from Military Aircraft.13 4. OBOG-MOLECULAR SIEVE SYSTEM COMPONENTS.15 4.1 Bleed Air Supply.15 4.2 Oxygen Concentrator.16 4.3 Oxygen Sensor 16 4.4 Demand Oxygen Regulators and Pressure Demand Oxygen Regu
11、lators.17 4.5 Continuous Flow Dispensing Equipment .17 4.6 Oxygen Masks .17 5. NOTES.18 5.1 Key Words18 APPENDIX A SCIENTIFIC BACKGROUND.19 SAE AIR825/6 - 3 - 1. SCOPE: The information provided in SAE AIR825/6 applies to On Board Oxygen Generating Systems (OBOGS) - Molecular Sieve, that utilize the
12、ability of molecular sieve materials by using Pressure Swing Adsorption Process (PSA) to separate and concentrate oxygen in the product gas from the surrounding air, respectively air provided by any compressor or by the aircraft engine (so called: Bleed Air), and to provide this oxygen enriched air
13、or product gas as supplemental oxygen for breathing gas supply of crew and passengers onboard aircraft. The distribution system and the provided oxygen concentration have to fulfill the respective FAA/JAA regulations. Equipment using this technology to provide supplemental oxygen for breathing gas s
14、upply of crew and passengers onboard aircraft, the suitable breathing gas oxygen partial pressure or oxygen concentration requirements are specified in AIR825/2 and the oxygen purity requirements in AS8010. NOTE: OBOGS has never been certified for commercial aircraft. The FAR/JAR 25 as well as FAR 1
15、21/JAR-OPS need to be reviewed and if necessary amended prior to introduction of OBOGS. Alternatively, such certification will likely incorporate various special conditions that address differences in performance between OBOGS and conventional systems. These systems are intended for: a. the on-line
16、breathing gas supply to directly account for the normal oxygen usage of crew and passengers in terms of: 1. supplemental oxygen for part or all of an emergency descent 2. supplemental oxygen for first aid 3. therapeutic oxygen b. the replenishment of the aircraft gaseous oxygen system storage cylind
17、ers to account for the normal oxygen usage of crew and passengers and system leakage c. a combination of the above. The possible applicability and benefit of incorporation of OBOGS-Molecular Sieve into non- military aircraft is being considered by the representatives of Civil Aviation. The intended
18、aim of AIR825/6 is to provide a fundamental description of the function of existing OBOGS- Molecular-Sieve systems with a related reference to the type of oxygen standards which would merit a review. -,-,- SAE AIR825/6 - 4 - 2. REFERENCES: 2.1 Applicable Documents: The following publications form a
19、part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue 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 references cited herein, t
20、he text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. AIR825 Oxygen Equipment for Aircraft
21、AS8010 Aviators Breathing Oxygen Purity Standard AS8025 Passenger Oxygen Mask 2.2 Related Publications: The following publications are provided for information purposes only and are not a required part of this SAE Aerospace Technical Report. 2.2.1 STANAG Publications: Available from NATO Headquarter
22、s, Boulevard Leopold III, 1110 Brussels, Belgium. STANAG 3865 Physiological requirements for aircraft molecular sieve oxygen concentrating systems 2.3 Abbreviations and Acronyms: MSOC Molecular Sieve Oxygen Concentrator MSOCS Molecular Sieve Oxygen Concentrating System MSOGS Molecular Sieve Oxygen G
23、enerating System OBOG On-Board Oxygen Generator OBOGS On-Board Oxygen Generating System. In common usage, one may encounter language such as “OBOGS system” although the “s” implies “system” in any case. OBOES On-Board Oxygen Enrichment System -,-,- SAE AIR825/6 - 5 - 2.3 (Continued): LROPS Long Rang
24、e Operation PSA Pressure Swing Adsorption RPSA Rapid Pressure Swing Adsorption, sometimes also used for a PSA with an extreme short process time 2.4 Definitions: Adsorbate Something that is adsorbed; e.g. nitrogen gathered on a surface of an adsorbent by adsorption. Adsorbent A material, a Zeolite o
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