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 there
2、from, is the sole responsibility of the user.” 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 2013 SAE International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: 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/AS1197A AEROSPACE STANDARD AS1197 REV. A Issued 1970-11 Revised 1998-12 Reaffirme
5、d 2013-12 Superseding AS1197 Continuous Flow Oxygen Regulator RATIONALE AS1197A has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE:This standard covers regulators of the following types:Type I - Automatic Continuous FlowType II - Adjustable Continuous FlowType III - Pre-set
6、 Continuous FlowClass A - Cylinder MountedClass B - Line MountedSpecial - Composite Continuous Flow (Appendix)1.1 Purpose:To establish requirements for construction, performance and testing of continuous flow oxygen regulators. This document supersedes in part AS463, 12-15-56, which is cancelled.FOR
7、EWORDChanges in this revision are format/editorial only.2. REFERENCES:AIR825 Oxygen Equipment for AircraftAS861 Minimum General Standards for Oxygen SystemsAS1046 Portable Oxygen EquipmentMIL-E-5272CMIL-O-27210I.C.C. Regulations, Tariff 19, Section 173.302Compressed Gas Association Pamphlet S-1, Par
8、t I, Paragraph 5.3.33. DESCRIPTION:The regulators described herein are intended to perform as oxygen supply regulators in aircraft supplemental oxygen breathing systems. The output of the regulator is delivered to a suitable sized outlet orifice at the pressures prescribed herein.4. DEFINITION:The r
9、egulator types are defined as follows:Type I - This type of regulator provides an output flow or pressure which varies automatically with cabin pressure to insure adequate delivery to the mask.Type II - This type of unit may be manually adjusted to deliver the proper amount of pressure or flow for a
10、 selected cabin pressure.Type III - This regulator has a fixed outlet flow or pressure which has been pre-set to provide adequate flow up to indicated cabin pressure.Class A - The regulators in this class are designed to be cylinder mounted.Class B - The regulators in this class are intended for use
11、 in a line between the oxygen source and the dispensing unit or on an oxygen cylinder valve.SAE INTERNATIONAL AS1197A Page 2 of 8_5. REQUIREMENTS:5.1 General:The requirements set forth in AS861, “Minimum General Standards for Oxygen Systems” and AS1046, “Portable Oxygen Equipment,” shall be consider
12、ed as part of this standard, except that should there be any conflict the requirements of this standard shall take precedence.5.2 Materials:Materials shall conform to applicable specifications, shall be of the best quality and shall be suitable for the purpose intended. Materials that are easily det
13、eriorated or otherwise affected adversely by continued service when used with oxygen shall not be used.5.2.1 Metals: Metals shall be of the corrosion-resistant type or suitably treated to resist corrosion due to salt spray, or atmospheric conditions likely to be met in storage or normal service life
14、 of the regulator.5.2.2 Elastomers: All elastomers used shall be manufactured within 24 months or less of the date of regulator manufacture. The cure date (month and year) shall be stamped on the elastomer component providing there is sufficient area. The figures shall be at least 3/16 inch high. Cu
15、re dates and age limitation shall not apply to silicone. The cure date of the oldest elastomers shall be stamped on the outside of the regulator.5.2.3 Protective Treatment: Materials which are used in the construction of the regulator that are subject to corrosion in oxygen, salt air, or other atmos
16、pheric conditions likely to occur during service usage, shall be protected against such corrosion in a manner that will in no way prevent compliance with the performance requirements of this Specification.5.3 Design:5.3.1 Class A Regulators: Class A regulators are intended to be mounted directly on
17、the oxygen cylinder and in addition to the pressure regulating characteristics shall include the following provisions:5.3.1.1 On-Off Control: A means shall be provided for manually turning the flow on or off. Both positions shall be clearly and permanently marked.5.3.1.2 Cylinder Contents Indicator:
18、 A pressure gage or other suitable means shall be provided to give continuous indication of cylinder contents.5.3.1.3 Charging: A self-closing charging valve or other suitable means shall be provided for charging the oxygen cylinder.SAE INTERNATIONAL AS1197A Page 3 of 8_5.3.1.4 Wrench Flats: The val
19、ve body shall have adequate wrench flats and be sturdy enough to withstand removal from the cylinder and attachment of outlet fittings.5.3.1.5 Standpipe: A standpipe shall be provided in the valve inlet to minimize the possibility of moisture and loose foreign matter from entering the regulator when
20、 the cylinder is inverted.5.3.1.6 Safety Outlet: A safety outlet shall be provided in accordance with I.C.C. Regulations, Tariff 19, Section 173.302. The safety outlet shall be the frangible disc type with no fusible metal and shall be designed to provide force equilibrium while relieving.5.3.2 Clas
21、s B Regulators: Class B regulators are intended to be mounted in line downstream of a cylinder and valve or other suitable oxygen source. Its function is simply one of pressure regulation.5.3.3 Oxygen Inlet Filter: A filter capable of filtering materials approximately 25 microns in size shall be pro
22、vided in the oxygen inlet port and filler valve port where applicable on all regulators.5.3.4 Relief Valve: A relief valve shall be provided to protect the regulator outlet from over-pressurization on all regulators.5.3.5 Type II Regulator: A means shall be provided to indicate setting of the manual
23、 control. Such means shall be clearly marked for proper cabin pressure setting.5.3.6 Type III Regulator: This regulator shall be clearly and permanently marked to show maximum altitude at which the regulator will provide sufficient oxygen to meet physiological requirements.5.4 Performance:The regula
24、tor shall meet the requirements specified in Section 5.5 when subjected to the applicable tests.5.5 Quality Assurance Provisions:5.5.1 Responsibility for Inspection: Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requir
25、ements specified herein.5.5.2 Qualification Inspection: Qualification inspection shall consist of all tests specified in Section 5.5.4.5.5.3 Test Media: The test media shall be dry oxygen, aviators breathing, conforming to MIL-O-27210 Type I.SAE INTERNATIONAL AS1197A Page 4 of 8_5.5.4 Inspection Met
26、hods: Tests shall be conducted in the order indicated.5.5.4.1 Visual Examination: The regulator shall be examined to determine conformance to this specification and applicable drawings with respect to materials, workmanship, construction, and marking.5.5.4.2 Pressure Regulation: Pressure regulation
27、and flow requirements shall be established by system design analysis. (AIR825 may be used as a guide.) The regulator shall be tested with all specified combinations of minimum and maximum supply pressures, flows and altitudes. Type I and Type II regulators shall be tested at 5000 ft intervals of alt
28、itude between minimum and maximum prescribed limits and Type III regulators shall be tested at maximum rated altitude. The regulated pressures shall be within the design limits at all test points.5.5.4.3 Leakage:5.5.4.3.1 Internal Leakage: Inlet pressures of 1850 50 psig and 150 10 psig shall be app
29、lied to the regulator and zero flow conditions shall be maintained for a period of 10 minutes. There shall be no indications of leakage as noted by an increase of outlet pressure.5.5.4.3.2 External Leakage in “Off” Position (Class A Regulators only): Inlet pressures of 1850 50 psig and 150 10 psig s
30、hall be applied to the regulator with the On-Off control in the “Off” setting. There shall be no evidence of leakage at the outlet port.5.5.4.3.3 External Leakage: With an inlet pressure of 1850 50 psig and the regulator flowing, all external connections and fittings shall be examined for leakage. T
31、here shall be no evidence of leakage.NOTE: For Type I regulators an external bleed not exceeding 200 sccm is permissible to facilitate automatic programming.5.5.4.4 Proof Pressure: A pressure of 3,000 psig shall be applied to the regulator inlet with all other ports closed with suitable cap or plug
32、(remove and cap or plug safety outlet of Class A regulator) for a period of five minutes. The regulator shall show no evidence of damage and shall meet the requirements of the pressure regulation test (5.5.4.2).5.5.4.5 Low Temperature Operation: The regulator shall be stabilized for 3 hours at a tem
33、perature of -40 F. While being maintained at this temperature the regulator shall meet the requirements of the pressure regulation test (5.5.4.2).5.5.4.6 High Temperature Operation: The test described in paragraph 5.5.4.5 shall be repeated with the unit stabilized at a temperature of 120 F.SAE INTER
34、NATIONAL AS1197A Page 5 of 8_5.5.4.7 Vibration: The regulator shall be mounted on a vibration test fixture and vibrated for a period of 3 hours in each of the three axis. Using the vibration test schedule of MIL-E-5272C, automatically cycle the frequency between 5 and 500 Hertz in 15 minute cycles a
35、t an applied double amplitude of 0.036 inch or an applied acceleration of 5 g, whichever is the lower value. The regulator shall then be subjected to and meet the requirements of paragraphs 5.5.4.2 and 5.5.4.3.5.5.4.8 On-Off Control Cycling (Class A only): The regulator shall be placed in a test sys
36、tem with an inlet pressure of 1850 50 psig and a flow of 5 lpm. The control knob shall be cycled from “On” to “Off” and back to “On” for 1000 cycles. The test shall be repeated with an inlet pressure of 100 10 psig. The regulator shall then be subjected to and meet the requirements of paragraphs 5.5
37、.4.2 and 5.5.4.3.5.5.4.9 Safety Outlet (Class A only): The safety outlet shall be tested in accordance with the procedures of Compressed Gas Association Pamphlet S-1, Part I, Paragraph 5.3.3. The safety outlet shall comply with the requirements as set forth in Compressed Gas Association Pamphlet S-1
38、, Part I, Paragraph 5.3.3 and/or DOT Regulation Tariff 19, Section 173.302 depending upon which document is applicable.PREPARED BY SAE COMMITTEE A-10, AIRCRAFT OXYGEN EQUIPMENTSAE INTERNATIONAL AS1197A Page 6 of 8_APPENDIX1. GENERAL:It has been the practice in several system designs to include a num
39、ber of additional functions as part of the basic regulator. Such regulators are defined herein as composite regulators.2. PURPOSE:The purpose of this section is to describe in general terms some of the functions which might be incorporated in a composite regulator. Performance limits depends upon sy
40、stem design requirements and only the more commonly used functions are described.3. REGULATOR FUNCTIONS:Unless otherwise indicated the following functions may be incorporated in any combination:3.1 Automatic Actuation:The regulator may incorporate means to automatically turn “ON” when ambient pressu
41、re falls below a predetermined value (usually between 12,000 and 15,000 feet). Manual means to turn on regulator at any altitude must be provided and this means would preferably be a separate device rather than an override type actuation of the automatic device. Either automatic closing or manual “r
42、eset” should be incorporated. The altitude range for automatic actuation should be adjustable.3.2 Remote Actuation:The regulator may incorporate means for actuation from a remote location. This may be either electrical or mechanical. If electrical means is used as the primary method of actuation pro
43、visions must be made for actuation in the event of electrical failure.3.3 Pressure Surge:A pressure surge device may be incorporated for the purpose of actuating door release mechanisms in automatic presentation systems. This device should increase outlet pressures upon actuation to a level sufficie
44、ntly high to actuate all door releases but not higher than the setting of the low pressure relief valve. The regulated pressure must return to the normal regulated schedule within a time which will not cause excessive loss of oxygen supply. If the dispensing manifold assemblies contain devices for s
45、hutting off a portion of the outlets when pressure falls below a given level, regulator response must be sufficient to prevent excessive pressure undershoot upon depletion of surge. It may be desirable to have the surge operative only upon automatic turn on and not when the regulator is manually act
46、uated.A separate means may also be incorporated to manually surge the system.SAE INTERNATIONAL AS1197A Page 7 of 8_3.4 Pressure Indicators:The regulator assembly may incorporate one or more of the following pressure indicators:a. Supply pressure gage or transmitter.b. Outlet pressure gage or transmi
47、tter.c. Outlet pressure switch to actuate indicator lights.3.5 Additional Outlets:In a two-stage regulator an additional outlet may be provided which would be controlled by the first stage. This would supply regulated pressure to a second system such as a demand system for the crew. The capacity of the first stage regulator must be sufficient to supply both systems at peak flow if this condition can occur.SAE INTERNATIONAL AS1197A Page 8 of 8_
