ISO 22538-4-2007 Space systems - Oxygen safety - Part 4 Hazards analyses for oxygen systems and components《航天系统 氧气安全 第4部分 氧气系统及组件的危险分析》.pdf
《ISO 22538-4-2007 Space systems - Oxygen safety - Part 4 Hazards analyses for oxygen systems and components《航天系统 氧气安全 第4部分 氧气系统及组件的危险分析》.pdf》由会员分享,可在线阅读,更多相关《ISO 22538-4-2007 Space systems - Oxygen safety - Part 4 Hazards analyses for oxygen systems and components《航天系统 氧气安全 第4部分 氧气系统及组件的危险分析》.pdf(14页珍藏版)》请在麦多课文档分享上搜索。
1、 Reference number ISO 22538-4:2007(E) ISO 2007INTERNATIONAL STANDARD ISO 22538-4 First edition 2007-09-01 Space systems Oxygen safety Part 4: Hazards analyses for oxygen systems and components Systmes spatiaux Scurit des systmes doxygne Partie 4: Analyse des dangers des systmes doxygne et leurs comp
2、osants ISO 22538-4:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing.
3、 In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be foun
4、d in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the
5、address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2007 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
6、 ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reservedISO 22538-4:2007(E) ISO 2
7、007 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 General. 2 5 Approach . 2 6 Procedures 3 6.1 Oxygen application and investigative scope. 3 6.2 Oxygen hazards analysis team . 4 6.3 Component/system information 4 6.4 Worst-case
8、operating conditions 4 6.5 Material flammability 4 6.6 Ignition mechanisms 5 6.7 Secondary effects analysis 6 6.8 Reaction effects analysis. 7 Annex A (informative) High-risk components . 8 Annex B (informative) Example of oxygen hazards analysis chart on a PTFE-lined flexible hose . 9 ISO 22538-4:2
9、007(E) iv ISO 2007 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body
10、 interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotec
11、hnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by
12、the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent righ
13、ts. ISO shall not be held responsible for identifying any or all such patent rights. ISO 22538-4 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 14, Space systems and operations. ISO 22538 consists of the following parts, under the general title Space syst
14、ems Oxygen safety: Part 1: Design of oxygen systems and components Part 2: Selection of metallic materials for oxygen systems and components Part 3: Selection of non-metallic materials for oxygen systems and components Part 4: Hazards analyses for oxygen systems and components The following parts ar
15、e under preparation: Part 5: Operational and emergency procedures Part 6: Facility planning and implementation INTERNATIONAL STANDARD ISO 22538-4:2007(E) ISO 2007 All rights reserved 1 Space systems Oxygen safety Part 4: Hazards analyses for oxygen systems and components 1 Scope This part of ISO 225
16、38 provides a process for conducting hazards analyses on parts, components and systems in oxygen and oxygen-enriched environments. This part of ISO 22538 identifies processes that may be used on ground support equipment, launch vehicles and spacecraft. 2 Normative references The following referenced
17、 documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NASA TM 104823, Guide for Oxygen Hazards Analyses on Components and Syste
18、ms 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 auto-ignition temperature temperature at which a material will spontaneously ignite in oxygen under specific test conditions 3.2 hazard source of danger, which could harm property or personne
19、l 3.3 impact-ignition resistance resistance of a material to ignition when struck by an object in an oxygen atmosphere under specific test conditions 3.4 ignition temperature temperature at which a material will ignite under specific test conditions 3.5 non-metallic material any material other than
20、a metal, or any composite in which the metal is not the most easily ignited component and for which the individual constituents cannot be evaluated independently ISO 22538-4:2007(E) 2 ISO 2007 All rights reserved3.6 oxygen compatibility ability of a material to coexist with oxygen and a potential so
21、urce of ignition at an expected pressure and temperature 3.7 oxygen-enriched atmosphere any gas or liquid that contains more than 25 volume percent oxygen 3.8 risk probability of loss or injury from a hazard 4 General Since most materials will burn in oxygen-enriched atmospheres, hazards are always
22、present when using oxygen. Most materials will ignite at lower temperatures in an oxygen-enriched atmosphere than in air. Once ignited, combustion rates are greater in the oxygen-enriched atmosphere. Many metals burn violently in an oxygen-enriched atmosphere. Lubricants, tapes, gaskets, fuels and s
23、olvents can increase the probability of ignition in oxygen systems. However, these hazards do not preclude the use of oxygen. Oxygen may be used safely if all materials in the system are not flammable in the end-use environment, or if ignition sources are identified and controlled. These ignition an
24、d combustion hazards necessitate a proper hazards analysis before introducing a material or component into oxygen service. This part of ISO 22538 describes a method for analysing the hazards of components and systems exposed to oxygen-enriched environments. The oxygen hazards analysis is a useful to
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