BS ISO 14624-4-2004 Space systems - Safety and compatibility of materials - Determination of upward flammability of materials in pressurized gaseous oxygen or oxygen-enriched envir.pdf

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1、BRITISH STANDARD AEROSPACE SERIES BS ISO 14624-4:2003 Space systems Safety and compatibility of materials Part 4: Determination of upward flammability of materials in pressurized gaseous oxygen or oxygen-enriched environments ICS 13.220.40; 49.025.01; 49.140 BS ISO 14624-4:2003 This British Standard

2、 was published under the authority of the Standards Policy and Strategy Committee on 15 January 2004 BSI 15 January 2004 ISBN 0 580 43258 0 National foreword This British Standard reproduces verbatim ISO 14624-4:2003 and implements it as the UK national standard. The UK participation in its preparat

3、ion was entrusted to Technical Committee ACE/68, Space systems and operations, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referre

4、d to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisio

5、ns of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or

6、 proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 8, an inside ba

7、ck cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 14624-4:2003(E) OSI 3002INTERNATIONAL STANDARD ISO 14624-4 First edition 2003-06-01 Space system

8、s Safety and compatibility of materials Part 4: Determination of upward flammability of materials in pressurized gaseous oxygen or oxygen-enriched environments Systmes spatiaux Scurit et compatibilit des matriaux Partie 4: Dtermination de linflammabilit verticale des matriaux dans des environnements

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14、42641 O4:(3002E) I SO 3002 All irhgts seredevr iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Conformance . 1 3 Terms and definitions. 1 4 Principle . 1 5 Reagents 2 6 Test system . 2 7 Test specimens . 4 8 Procedure. 5 9 Accuracy 6 10 Test report 6 11 Good laboratory practice . 6 Annex A (

15、informative) Competency and accreditation of test facilities . 7 Bibliography . 8 BSISO146244:2003IS-42641 O4:(3002E) iv I SO 3002 All irhgts seredevrForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work

16、 of preparing International Standards is normally carried out through ISO technical committees. Each member body 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-governmen

17、tal, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical 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 ma

18、in task of technical committees is to prepare International Standards. Draft International Standards adopted by 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. At

19、tention 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 identifying any or all such patent rights. ISO 14624-4 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC

20、 14, Space systems and operations. ISO 14624 consists of the following parts, under the general title Space systems Safety and compatibility of materials: Part 1: Determination of upward flammability of materials Part 2: Determination of flammability of electrical-wire insulation and accessory mater

21、ials Part 3: Determination of offgassed products from materials and assembled articles Part 4: Determination of upward flammability of materials in pressurized gaseous oxygen or oxygen- enriched environments Part 5: Determination of reactivity of materials with aerospace propellants Part 6: Determin

22、ation of reactivity of processing materials with aerospace fluids Part 7: Determination of permeability of materials to aerospace fluids BSISO146244:2003IS-42641 O4:(3002E) I SO 3002 All irhgts seredevr vIntroduction Throughout this part of ISO 14624, the minimum essential criteria are identified by

23、 the use of the imperative or the key word “shall”. Recommended criteria are identified by the use of the key word “should” and, while not mandatory, are considered to be of primary importance in providing serviceable, economical and practical designs. Deviations from the recommended criteria may be

24、 made only after careful consideration, extensive testing and thorough service evaluation have shown an alternative method to be satisfactory. BSISO146244:2003blank BSISO146244:2003INTENRATIONAL TSANDADR IS-42641 O4:(3002E)I SO 3002 All irhgts seredevr 1Space systems Safety and compatibility of mate

25、rials Part 4: Determination of upward flammability of materials in pressurized gaseous oxygen or oxygen-enriched environments 1 Scope This part of ISO 14624 specifies a test method for determining the flammability of aerospace materials in pressurized gaseous oxygen (GOX) and oxygen-enriched environ

26、ments, at ambient temperature. This method may also be used to provide supplementary information by testing at pressures other than the intended use pressure (see Clause 4). The standard pressure range for this test method is from ambient to 69 000 kPa. 2 Conformance The tests shall be performed in

27、an accredited test facility (see Annex A for guidelines). The authority having jurisdiction, or the test requester, shall provide properly identified material(s) for testing. Alternatively, accredited test facilities may be authorized by the test requester to procure the appropriate material(s). 3 T

28、erms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 burn length length of specimen that has been consumed by combustion NOTE The burn length is determined by subtracting the post-test specimen length from the pre-test specimen length. 3.2 flammable

29、material a material is considered to be flammable at a specific pressure if at least one specimen burns more than 150 mm at that pressure 3.3 good laboratory practice GLP practice which involves the testing of standard reference materials to verify data accuracy and repeatability 4 Principle In a hi

30、gh-pressure test chamber containing a specific test environment, an ignition source, delivering a defined amount of energy, is applied to the lower end of a vertically oriented test specimen. The maximum post-test burn length for at least 10 standard-sized specimens is recorded. Materials are consid

31、ered flammable at a specific pressure if at least one specimen burns more than 150 mm. Tests shall be conducted at ambient temperature, in gaseous oxygen or oxygen-enriched environments. The test pressure shall simulate the worst- case environment in which ignition and combustion of the material are

32、 likely to occur. To obtain BSISO146244:2003IS-42641 O4:(3002E) 2 I SO 3002 All irhgts seredevrsupplementary information, as well as provide a direct comparison between all the materials tested, specimens may be tested at the appropriate pressures selected from those given in Table 1. Table 1 Test p

33、ressures Test pressure kPa 100 170 350 690 1 700 3 500 6 900 14 000 21 000 35 000 52 000 69 000 5 Reagents 5.1 Gases, used for the tests. 6 Test system 6.1 Test chamber and associated equipment, capable of providing a pressure of up to 69 000 kPa, and having a volume such that no more than 5 % of th

34、e available oxygen is consumed during the test. In addition, the test chamber shall not interfere chemically or physically with the test. 6.2 Specimen holder, capable of being attached to the top of the specimen and holding it in a vertical position (see Figure 1). 6.3 Ignition source, comprising a

35、promoter (6.3.1), an ignitor wire (6.3.2) and a power supply (6.3.3). 6.3.1 Promoter, physically attached to the specimen (see Figure 2) and consisting of a sufficient quantity of aluminium or magnesium to release at least 3,0 kJ. 6.3.2 Ignitor wire, bare, made of aluminium-palladium or nickel-chrom

36、ium. 6.3.3 Power supply, electrically insulated, capable of providing 40 A (RMS) at 50 V, used to supply current to the ignitor wire (6.3.2). 6.4 Measuring devices, such as pressure gauges and oxygen-measuring devices, in proper calibration. BSISO146244:2003IS-42641 O4:(3002E) I SO 3002 All irhgts s

37、eredevr 3Key 1 oxygen supply port 2 ceramic specimen holder 3 test specimen 4 ignitor wire 5 promoter 6 gas outlet port 7 copper alligator clip 8 viewing port 9 ignition wire feedthroughs Figure 1 Typical test chamber with specimen mounted in specimen holder BSISO146244:2003IS-42641 O4:(3002E) 4 I S

38、O 3002 All irhgts seredevrDimensions in millimetres a) Specimen b) Promoter Figure 2 Test specimen and promoter 7 Test specimens 7.1 Materials The minimum quantities of materials required to perform each test properly are summarized in Table 2. Actual test configurations and material quantities for

39、material forms other than those listed shall be established and approved by the authority having jurisdiction. BSISO146244:2003IS-42641 O4:(3002E) I SO 3002 All irhgts seredevr 5Table 2 Minimum quantities of materials required for testing at each pressure Form of material Minimum quantity Standard 1

40、0 rod specimens measuring 305 mm long 3,2 mm in diameter Typical non-standard 10 specimens measuring 305 mm long 3,2 mm 3,2 mm As a minimum, all materials used in testing shall meet or exceed user specifications. Material characteristics can be significantly compromised by sources of contamination,

41、such as exposure to solvents, cleaning agents, abnormal temperatures, variations in humidity, environmental pollutants, particulates and handling. It is important that exposure of test material(s) to these and other contamination sources be sufficiently controlled to minimize variation in test resul

42、ts. 7.2 Receipt Receive and visually inspect the test material: when received, it shall be accompanied by proper identification and standard specimens shall be in the form of cylindrical rods 3,2 mm in diameter by 305 mm long. Any flaws shall be noted. 7.3 Cleaning Specimens shall have been cleaned

43、and dried to end-use specifications prior to receipt at the test facility. If, however, specimens are received with obvious contamination, clean them. All cleaning methods shall be approved by the test requester prior to use. 7.4 Preparation If required, prepare specimens to the proper dimensions. I

44、f a material cannot be obtained or prepared in the cylindrical form, then a non-standard specimen shall be prepared. A typical non-standard specimen might have a square (as opposed to round) cross-section, with 3,2 mm sides, and be a minimum of 305 mm in length. Any coatings shall be applied, to the

45、 thickness proposed for use, to rods. 7.5 Inspection After preparation and/or cleaning at the test facility, inspect the specimens to ensure that they are of the proper dimensions. Any flaws and any residual contamination shall be noted. If the flaws result from specimen preparation at the test faci

46、lity, new specimens shall be prepared. 8 Procedure WARNING Burning of materials may produce smoke and toxic gases, which can affect the health of operators. The test area shall be cleared of smoke and fumes by suitable means. In addition, the use of oxygen-enriched test gases and high-pressure test

47、systems provides unique hazards which should be appropriately addressed prior to utilizing this test procedure. 8.1 Before testing Before testing, record all pertinent information (including initial test pressure, specimen identification and pre- test length). The test system shall be visibly clean,

48、 and all measuring devices shall be in proper calibration. BSISO146244:2003IS-42641 O4:(3002E) 6 I SO 3002 All irhgts seredevrPress the promoter onto the test specimen and wrap the ignitor wire around the promoter. Mount the test specimen firmly in the specimen holder, and connect the ignitor wire t

49、o the power supply. 8.2 Test Place the specimen and holder in the test chamber and establish the proper test atmosphere. Record the initial pressure. Activate the ignition source. Immediately the promoter has ignited, turn off the power supply. After the test, record the final pressure and the specimen burn length. 9 Accuracy Measurements shall be made within the following tolerance