ISO-22538-3-2007.pdf
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1、 Reference number ISO 22538-3:2007(E) ISO 2007 INTERNATIONAL STANDARD ISO 22538-3 First edition 2007-09-01 Space systems Oxygen safety Part 3: Selection of non-metallic materials for oxygen systems and components Systmes spatiaux Scurit des systmes doxygne Partie 3: Slection des matriaux non mtalliq
2、ues pour les systmes doxygne et leurs composants Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Spiller, Kevin Not for Resale, 10/07/2007 22:16:14 MDTNo reproduction or networking permitted without license from
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6、he 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 eit
7、her 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 reserved Copyright Internation
8、al Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Spiller, Kevin Not for Resale, 10/07/2007 22:16:14 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 22538-3:2007(E) ISO 2007 All rights reserved iii Content
9、s Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms, definitions, symbols and abbreviated terms. 1 3.1 Terms and definitions. 1 3.2 Symbols and abbreviated terms . 2 4 General. 2 4.1 Background. 2 4.2 Design considerations . 2 4.3 Materials certification. 3 5 Materials co
10、ntrol. 3 5.1 General. 3 5.2 Batch/lot testing 3 6 Ignition mechanisms 4 6.1 General. 4 6.2 Ignition conditions 4 6.3 Materials tests. 4 6.4 Ignition factors 4 6.5 Ignition mechanisms and sources 5 7 Material selection 7 7.1 General. 7 7.2 Material types 8 Bibliography. 11 Copyright International Org
11、anization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Spiller, Kevin Not for Resale, 10/07/2007 22:16:14 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 22538-3:2007(E) iv ISO 2007 All rights reserved Foreword ISO (
12、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 interested in a subject for which a technical commi
13、ttee 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 Electrotechnical Commission (IEC) on all matters of electrotec
14、hnical 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 the technical committees are circulated to the membe
15、r 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 rights. ISO shall not be held responsible for identifyin
16、g any or all such patent rights. ISO 22538-3 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 systems Oxygen safety: Part 1: Design of oxygen systems
17、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 are under preparation: Part 5: Operational and emergen
18、cy procedures Part 6: Facility planning and implementation Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Spiller, Kevin Not for Resale, 10/07/2007 22:16:14 MDTNo reproduction or networking permitted without lic
19、ense from IHS -,-,- ISO 22538-3:2007(E) ISO 2007 All rights reserved v Introduction Polymers, although used extensively, are flammable in oxygen. The ignitability of polymers varies considerably, but the risk associated with the flammability of polymers can be minimized through proper selection comb
20、ined with proper design. When selecting polymers for high-pressure oxygen systems, the susceptibility to ignition of the polymer and the possible ignition sources in the system are given equal consideration with the structural requirements. The most common cause of ignition of polymeric materials in
21、 high-pressure systems is probably adiabatic compression heating of oxygen in the system by rapid pressurization. For this reason, it is important that oxygen systems containing polymers be pressurized slowly. Mechanical impact is rarely a credible ignition source in high-pressure oxygen systems bec
22、ause the level of mechanical impact to which polymeric materials are now exposed is normally well below the energies required for reaction. However, mechanical valve actuation, which has been largely eliminated from current designs, can cause impact loading of valve seats or other detail parts resul
23、ting in failure of the parts or mechanically induced ignition of polymeric materials. Other mechanisms for ignition of non-metallic materials are considered although test data may not exist. Ignition of polymeric materials by impact of metallic and non-metallic particulate is probably feasible, alth
24、ough no conclusive studies have been conducted. Ignition of polymeric materials by burning contaminants has not been studied experimentally, but the use of incompatible oils and greases (especially hydrocarbon greases) is one of the most common causes of oxygen-system fires. Improper component desig
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