SAE-AIR-825-8-2002.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 therefr
2、om, 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 2002 Society of Automotive Engineers, Inc. All rights reserved. No part of
3、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: 724-776-4
4、970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS:http:/www.sae.org AEROSPACE INFORMATION REPORT AIR825/8 Issued2002-10 Continuous Flow Oxygen Systems FOREWORD This document is one of a set of related documents. These documents comprehensively address the “Introduction to Oxy
5、gen 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 reader
6、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 are o
7、f specific interest. The document set is written as 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 the rea
8、der toward more detailed treatments located in other SAE documents. Copyright SAE International Provided by IHS under license with SAELicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:00:00 MSTNo reproduction or networking permitted without license from IHS -,-,-
9、 SAE AIR825/8 - 2 - TABLE OF CONTENTS 1.SCOPE .3 2.REFERENCES .3 2.1Applicable Documents3 2.1.1FAR/JAR Airworthiness Requirements.3 2.1.2SAE Publications3 2.1.3Bureau of Explosives Publications.3 2.2Definitions.3 3.SYSTEM DESCRIPTION AND OPERATION.4 3.1General.4 4.CHEMICAL OXYGEN SYSTEMS.4 5.GASEOUS
10、 OXYGEN CONTINUOUS FLOW SYSTEMS.5 5.1Supply Systems5 5.2Distribution System 5 5.2.1Regulator5 5.2.2Low Pressure Tubing .6 5.2.3Low Pressure Fittings.6 5.2.4Dispensing Outlets.7 6.DISPENSING EQUIPMENT (MASKS) .7 6.1Nasal Masks.8 6.2Oronasal Masks .8 6.3Permanent Masks 9 6.4Disposable Masks9 7.CONTINU
11、OUS FLOW OXYGEN SYSTEM LIMITATIONS.9 8.RECOMMENDED PROCEDURES IN CASE OF SMOKE.11 9.SYSTEM SCHEMATICS.11 9.1Fixed Continuous Flow Systems11 9.2Continuous Flow Portable Unit.12 10. NOTES12 10.1Key Words12 Copyright SAE International Provided by IHS under license with SAELicensee=IHS Employees/1111111
12、001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:00:00 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AIR825/8 - 3 - 1.SCOPE: This SAE Aerospace Information Report (AIR) provides general information on Continuous Flow Oxygen Systems which are available, princip
13、le functions of those systems and technical approaches to be taken into account during design and realization of systems. However, particular performance specifications and detailed information of manufacturing, testing and integration of such systems is beyond the scope of this document. 2.REFERENC
14、ES: 2.1Applicable Documents: 2.1.1FAR/JAR Airworthiness Requirements: 2.1.2SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. AIR825/3Gaseous Oxygen and Oxygen Equipment, Introductory AIR825/4Chemical Oxygen Systems AIR825/5Liquid Oxygen Systems AIR825/14Basic S
15、ystem Design, Schematics, Charts and Tables AS1224Continuous Flow Aviation Oxygen Masks AS1225High Pressure Oxygen System Filler Valve ARP1532Oxygen System Installation and Fabrication AS8010Aviators Breathing Oxygen Standard AS8025Passenger Oxygen Mask 2.1.3Bureau of Explosives Publications: Availa
16、ble from Bureau of Explosives Publications, P.O. Box 1265, Evans City, PA 16033, USA. Bureau of Explosives, i.c.c. Tariff No., BOE - 6000(*) Hazardous Materials Regulations of the Department of Transportation (49 CFR - Parts 106, 107, 110, 171 - 180 and 397) by Air, Rail, Highway and Water including
17、 Specifications of Shipping Containers. Document can be obtained from 2.2Definitions: CONTINUOUS FLOW OXYGEN SYSTEM: System that delivers a continuous flow of oxygen to the mask at a rate which is constant for a given altitude. Copyright SAE International Provided by IHS under license with SAELicens
18、ee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:00:00 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AIR825/8 - 4 - 3.SYSTEM DESCRIPTION AND OPERATION: 3.1General: Aircraft oxygen systems may utilize as source chemically generated, gase
19、ous or liquid oxygen. This is the method of storage only, since the oxygen as it reaches the user in either system is gaseous. There are several types of continuous flow systems ranging from the simplest to more complex systems which afford varying degrees of oxygen economy. For typical layout of sy
20、stems refer to Section 9 System Schematics. Continuous flow systems have been used for many years; they are probably the simplest from standpoint of design, cost, weight and maintenance and offer reasonable respiratory protection for brief periods approaching pressure altitudes as high as 40,000 fee
21、t (12,192 m). For prolonged protection, continuous flow equipment is generally regarded to be adequate up to 25,000 feet (7620 m). The principle function can be described as following: From a pressure regulated source, a constant flow of oxygen is supplied via calibrated orifices to masks, where air
22、 will be added by means of valving incorporated in masks to provide the breathing flow to the users. The system should be designed to meet FAA/JAA airworthiness requirements with regards to minimum flow rates and should therefore be designed to suit the efficiency of particular equipment considered.
23、 The primary disadvantage of a continuous flow system is its inability to adjust itself automatically to varying oxygen flow levels. Continuous flow systems may be used for passengers as well for flight crew. 4.CHEMICAL OXYGEN SYSTEMS: In the case of Chemical Oxygen Systems, oxygen generators produc
24、e breathing oxygen by means of chemical reaction. For details refer to AIR825/4 Chemical Oxygen Systems. Those systems mainly consist of oxygen generators, supply tubing directly connected from the generator to continuous-flow oxygen mask assemblies, mounting and housing devices and electrical relea
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