BS ISO 23935-2008 Aircraft Environmental test procedures for airborne fluid system components Resistance to fire in designated fire zones《航空器 气载流体系统元件用环境试验程序 在指定火灾区域的耐火性》.pdf

1、BRITISH STANDARDBS ISO 23935:2006Aircraft Environmental test procedures for airborne fluid system components Resistance to fire in designated fire zonesICS 49.080g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g

2、44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS ISO 23935:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2008 BSI 2008ISBN 978 0 580 54464 4National forewordThis British Standard is the UK implementation of ISO 2

3、3935:2006. The UK participation in its preparation was entrusted to Technical Committee ACE/69, Aerospace hydraulic systems, fluids and components.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the ne

4、cessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsReference numberISO 23935:2006(E)INTERNATIONAL STANDARD ISO23935First editio

5、n2006-06-15Aircraft Environmental test procedures for airborne fluid system components Resistance to fire in designated fire zones Aronefs Mthodes dessai en environnement des lments de systmes de fluides embarqus Tenue au feu dans les zones dsignes zone de feu BS ISO 23935:2006ii iiiForeword ISO (th

6、e 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 committ

7、ee 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 Inter-national Electrotechnical Commission (IEC) on all matters of electrotech

8、nical 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 member

9、 bodies for voting. Publication as an Interna-tional 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

10、g any or all such patent rights. ISO 23935 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid systems and components. BS ISO 23935:2006blank1Aircraft Environmental test procedures for airborne fluid system components Resistance to fire in

11、designated fire zones CAUTION Precautions shall be taken to safeguard the health of personnel conducting tests against the risk of fire, inhalation of smoke and/or toxic products of combustion. 1 Scope This International Standard specifies the requirements for tests which may be applied to all fluid

12、 system com-ponents located in zones designated as “fire zones” and built to satisfy the minimum level specified for with-standing fire. This International Standard does not relate to withstanding fire outside designated fire zones, nor to flammability requirements, or to those conditions induced by

13、 the flame coming from the combustion chamber. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer-ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any

14、 amendments) applies. ISO 2685:1998, Aircraft Environmental test procedure for airborne equipment Resistance to fire in designated fire zones. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 designated fire zone region of an aircraft, for exa

15、mple compartments containing main engines and auxiliary power units, desig-nated as such by the aircraft designer in accordance with the requirements of the approving authority 3.2 component any part of a fluid system which is to convey and/or contain fluid in liquid or gaseous condition 3.3 fire re

16、sistant grade designating components capable of withstanding the application of heat by a standard flame for 5 min 3.4 fireproof grade designating components capable of withstanding the application of heat by a standard flame for 15 min BS ISO 23935:20062 4 Test equipment The test rig shall be in ac

17、cordance with ISO 2685:1998. The test rig shall withstand the test conditions and simulate, as much as possible, the operating conditions of the real fluid circuit. 5 Test requirements 5.1 Test procedure The following procedure applies to all fire tests. For general requirements concerning the mount

18、ing of the specimen, and the choice and calibration of the burner, ISO 2685:1998 applies. The test conditions may vary during the fire exposure duration. The regulation of all these test conditions shall be stipulated in the test report. 5.1.1 Standard test conditions 5.1.1.1 Test fluid Table 1 appl

19、ies. Table 1 Test fluid codes Code Test fluid A Fuel or high-temperature resisting oil B Air or nitrogen 5.1.1.2 Fluid temperature 5.1.1.2.1 For liquid application The fluid temperature inside the component shall be between 93 C and 110 C (200 F and 230 F). 5.1.1.2.2 For gaseous application The flui

20、d temperature inside of the component shall be between 18 C and 22 C (64,5 F and 71,5 F). 5.1.1.3 Pressure The pressure shall be the nominal pressure of the component as specified in the relevant procurement speci-fication. BS ISO 23935:200635.1.1.4 Flow rate The flow rate shall be less than or equa

21、l to the minimum working flow under normal operating conditions, as specified in Table 2. Table 2 Flow rate Flow rate 10 % Code dm3/min (l/min)a(US gallon/min)bA No flow No flow B 0,006 d 21 d 2C 0,03 d 25 d 2ad is the minimal internal diameter of the hose as specified in the relevant procurement sp

22、ecification, expressed in millimetres. bd is the minimal internal diameter of the hose as specified in the relevant procurement specification, expressed in inches. 5.1.1.5 Vibration level Components shall be vibrated along or perpendicular to the axis of the component at a frequency between 30 Hz an

23、d 60 Hz and with a minimum amplitude of 1,6 mm (0,063 in) in front of the flame. 5.1.1.6 Flame location The hose to be tested shall be not less than 600 mm (23,6 in) long. Hoses shall be mounted horizontally and shall include one 90 bend. One end fitting and at least 120 mm (4,7 in) of hose shall be

24、 enveloped by the test flame. 5.1.1.7 Test duration The test duration shall be in accordance with the grade designated for the component to resist fire, i.e. fire re-sistant or fireproof (see 3.3 and 3.4). See Table 3. Table 3 Test duration Code Duration min 05 5 15 15 5.1.2 Specific test conditions

25、 5.1.2.1 Test fluid The test conditions of the test fluid shall be equivalent to the normal operating conditions of the working fluid. Test fluid codes are identical to those in 5.1.1.1. BS ISO 23935:20064 5.1.2.2 Fluid temperature The fluid temperature inside the component shall be greater than or

26、equal to the maximum working temperature under normal operating conditions. When “no flow” or low flow rate is applied, these temperatures are only given at the beginning of the fire test. The fluid temperature shall not be regulated better than under normal operating conditions. 5.1.2.3 Pressure Th

27、e pressure shall be greater than or equal to the maximum working pressure under normal operating condi-tions. 5.1.2.4 Flow rate The flow rate shall be less than or equal to the minimum working flow under normal operating conditions. 5.1.2.5 Vibration level The vibration level shall be in accordance

28、with the worst working vibration level (frequency and amplitude) un-der normal operating conditions. 5.1.2.6 Flame location The flame shall be located in front of the most critical exposed area of the component in accordance with the working position under normal operating conditions. 5.1.2.7 Test d

29、uration The test duration shall be in accordance with the grade designated for the component to resist fire, i.e. fire re-sistant or fireproof (see 3.3 and 3.4). 5.2 Test acceptance conditions As conditions of acceptance, the system components shall show no evidence of leakage over the test duration

30、 6 Designation Reference to this International Standard shall be made in one of two ways: either by using standard codes (when standard test conditions are applied) or by using the real test condition values, as specified in Figures 1 and 2, respectively. EXAMPLE ISO FFFFF CLASS A15B Figure 1 Desig

31、nation using standard codes BS ISO 23935:20065aOptional codification when different test conditions are used during a second part of the test: EXAMPLE ISO FFFFF A15-0060-210-025-10-0000-210-10 When test conditions are the same for the total duration, the designation shall stop just after the first t

32、emperature value: EXAMPLE ISO FFFFF A15-0060-210-025 When a test condition is unchanged during the second part of the test, it shall not be omitted in the designation. Figure 2 Designation using real test condition values BS ISO 23935:2006BS ISO 23935:2006BSI Group Headquarters389 Chiswick High Road

33、London W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 Standards Institute (BSI)BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish

34、Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while u

35、sing this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000 Fax: +44 (0)20 8996 7400BSI offers members an individual updating service called PLUS which ensures that subscribers au

36、tomatically receive the latest editions of standards.Buying standardsOrders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001 Email: You may also buy directly using a debit/credit card from the BS

37、I Shop on the Website http:/ response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested.Information on standardsBSI provides a wide range of information on national, European and

38、 international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048 Email: Subsc

39、ribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: Information regarding online

40、 access to British Standards via British Standards Online can be found at http:/ information about BSI is available on the BSI website at http:/.CopyrightCopyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodi

41、es. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free

42、use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070 Email: