1、BRITISH STANDARD AEROSPACE SERIES BS 4N 100-3:1999 Incorporating Amendment No.1 Aircraft oxygen systems and equipment Part 3: Testing of equipment and systems ICS 49.090 BS 4N 100-3:1999 This British Standard, having been prepared under the direction of the Engineering Sector Committee, was publishe
2、d under the authority of the Standards Committee and comes into effect on 15 October 1999 BSI 1 March 2004 The following BSI references relate to the work on this British Standard: Committee reference ACE/38 Draft for comment 96/706266 DC ISBN 0 580 29561 3 Committees responsible for this British St
3、andard The preparation of this British Standard was entrusted to Technical Committee ACE/38, Aircraft oxygen equipment, upon which the following bodies were represented: British Airways British Compressed Gases Association Civil Aviation Authority Airworthiness HSE Health and Safety Executive MoD UK
4、 Defence Standardization Society of British Aerospace Companies Limited South Bank University Co-opted members Amendments issued since publication Amd. No. Date Comments 14906 1 March 2004 See national forewordBS 4N 100-3:1999 BSI 1 March 2004 i Contents Page Committees responsible Inside front cove
5、r Foreword ii 1S c o p e 1 2 Normative references 1 3 Apparatus and materials 1 4 Hydraulic pressure tests 2 5L e a k a g e t e s t s 3 Bibliography 4BS 4N 100-3:1999 ii BSI 1 March 2004 Foreword This Part of BS 4N 100 has been prepared by Technical Committee ACE/38 and provides guidance on the phys
6、iological factors to be considered when designing equipment for use with oxygen. It partially supersedes BS 3N 100 which was withdrawn upon publication of all seven parts. The start and finish of text introduced or altered by Amendment No.1 is indicated in the text by tags !“. BS 4N 100 consists of
7、the following parts: Part 1: Design and installation; Part 2: Tests for the compatibility of materials in the presence of oxygen; Part 3: Testing of equipment and systems; Part 4: Guide to the physiological factors; Part 5: Guide to fire and explosion hazards associated with oxygen; Part 6: Guidance
8、 and recommendations on the selection of materials for use with oxygen; Part 7: Guide to cleaning, labelling and packaging. NOTE The latest revision of an aerospace series standard is indicated by a prefix number. This publication does not purport to include all the necessary provisions of a contrac
9、t. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. The
10、BSI copyright notice displayed in this document indicates when the document was last issued.BS 4N 100-3:1999 BSI 1 March 2004 1 1 Scope This Part of BS N 100 provides guidance on the methods for testing equipment and systems for use with oxygen. It specifies the design of test rigs and test apparatu
11、s and it describes pressure testing and leakage testing of equipment. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of this British Standard. For dated references, subsequent amendments to, or rev
12、isions of, any of these publications do not apply. For undated references the latest edition of the publication referred to applies. BS 2 N 3, Specification for gaseous breathing oxygen supplied for airborne application. BS 4 N 100-2, Aircraft oxygen systems and equipment Tests for the compatibility
13、 of materials in the presence of oxygen. BS 4 N 100-6, Aircraft oxygen systems and equipment Guidance and recommendations on the selection of materials for use with oxygen. BS 4 N 100-7, Aircraft oxygen systems and equipment Guide to cleaning, labelling and packaging. BS 4366, Specification for indu
14、strial nitrogen. Defence Standard 16-1/3, Oxygen; liquid and gaseous (breathing) for aircraft systems. 1) Defence Standard 16-8/4, Air; compressed (breathing) for aircraft systems. 1) Defence Standard 16-19/2, Nitrogen; compressed, oil-free: for all applications. 1) Defence Standard 68-95/2, Nitroge
15、n; compressed, high purity, oil-free for all applications. 1) 3 Apparatus and materials 3.1 Test rigs 3.1.1 Test rigs shall be fitted with a filtration system to safeguard against the ingress or transmission of contaminants. To avoid particle contamination of the item under test, a 5 m (nominal) fil
16、ter should be fitted as near to the test connection as possible. 3.1.2 Fittings used for connecting an item of oxygen equipment to a test rig shall be cleaned internally and externally to be free from contaminants. Their design shall be such that the generation of swarf or other particles cannot occ
17、ur during connection or disconnection, or enter the item. 3.1.3 Test rigs shall be constructed from valves, components and equipment which conform to the material selection and cleanliness criteria as defined in BS 4N 100-6 and BS 4N 100-7, even if the test medium is not oxygen. 3.1.4 Quick opening
18、valves or designs that can cause rapid (adiabatic) pressurization, especially in flexible pipelines or hoses, shall not be used. 3.1.5 Ensure that any oxygen vented by test rig or equipment under test does not accumulate or impinge on any electrical component or heated non-approved material surfaces
19、 (see BS N 100-6). 3.1.6 Site the test rig and equipment away from any uncontrolled heat source. NOTE Most tests are defined at NTP conditions, i.e. 101.3 kPa (1013 mbar) pressure and 15 C temperature. WARNING NOTE Test rigs should be identified by permanent labelling with the words “For use with ox
20、ygen equipment only”. !3.1.7 Ensure that all parts of the test rig are electrically bonded together and that the maximum resistance to ground from any part is 1 ohm. The maximum resistance to ground from the item under test through any connection to the test rig shall be 1 ohm. “ 1) Obtainable from
21、Ministry of Defence, Directorate of Standardization, Kentigern House, 65 Brown Street, Glasgow G2 8EX.BS 4N 100-3:1999 2 BSI 1 March 2004 3.2 Vacuum test equipment 3.2.1 Vacuum test equipment shall be of a capacity that the flow requirements of the item under test do not inhibit the maintenance of t
22、he selected simulated altitude. 3.2.2 The type of vacuum system utilized shall be safe for the passage of pure oxygen. Material selection shall be in accordance with the requirements of BS N 100-6. 3.3 Liquefied gases Tests on liquid oxygen equipment requiring a liquefied gas shall be carried out us
23、ing liquid oxygen conforming to Defence Standard 16-1/Issue 3, Section 3. 3.4 Oxygen, nitrogen and air Gases used for testing items of oxygen equipment shall conform to the following publications: NOTE A 7mg/m 3(7 micrograms per litre) water content is equivalent to a dewpoint of p61 C and is approx
24、imately 10 10 p6v/v. WARNING NOTE 1 It is essential that under no circumstances should nitrogen be used in tests involving live subjects. WARNING NOTE 2 The use of gaseous nitrogen is preferred excepting warning note 1, but, if this is not practicable, oxygen or air (in this order) may be used: ensu
25、re that the necessary calibration corrections are applied. If air is used directly from a compressor, filtration shall be provided to remove oil, water and/or other contaminants so that the air conforms to the requirements of the standard referenced in 3.4. Oxygen shall be used for type approval tes
26、ts and similar approval work of systems/equipment in accordance with their individual specifications. WARNING NOTE 3 If testing is carried out using other than gaseous oxygen, the item of equipment or system should be purged with gaseous oxygen, after the test, taking care to ensure that the equipme
27、nt or system is thoroughly purged. 4 Hydraulic pressure tests 4.1 Carry out hydraulic pressure tests using distilled (de-ionized/demineralized) water. Up to 25 10 p6v/v of an approved detergent, conforming to BS N 100-2, may be added to reduce the surface tension and hence aid the removal of the wat
28、er after the test. Ethanol, Iso-propyl alcohol or trichloroethylene may be used but care should be taken to avoid material incompatibility if elastomers or other non-metals are wetted during the test. 4.2 After the test, thoroughly dry the parts of the system and ensure that they are free from any c
29、ontaminant introduced by the test. This is particularly the case if flammable agents (e.g. ethanol) or potentially toxic harmful fluids (e.g. trichloroethylene) are used. Heat or vacuum are useful processes to aid drying in components with narrow passages, or small internal features. NOTE Refer to C
30、lause 9 of BS N 100-1 for guidance on test pressure selection and other relevant information, and BS N 100-7 for cleaning. Oxygen: BS N 3 or Defence Standard 16-1/Issue 3, (Section 2;) Nitrogen: BS 4366, Defence Standard 16-19 Issue 2 or 68-95 Issue 2; Air: Defence Standard 16-8/Issue 4, or in accor
31、dance with the following: Up to 15 C, maximum water content 7 micrograms per litre of air at 101.3 kPa. Above 15 C, a higher water content may be acceptable, but be aware of the temperature drop effect caused as air flows from higher pressure to a lower pressure. BS 4N 100-3:1999 BSI 1 March 2004 3
32、5 Leakage tests The oxygen equipment and/or pipe connections shall be tested for leakage using any of the following: a) a solution of de-ionized/demineralized water with an approved detergent wetting agent, conforming to BS N 100-2; b) a pressure drop method; c) by collection of leakage gas in an en
33、closed volume; or d) by pressurizing the equipment with helium or similar inert gas and using a leak seeker “sniffer” or mass-spectrometer technique to locate and/or quantify any leak. Ensure that equipment is clean and purged of any test medium after completion of the leakage test. NOTE If pressure
34、 measurements are taken with a liquid manometer, avoid contamination of the equipment by the liquid.BS 4N 100-3:1999 BSI 1 March 2004 4 Bibliography BS 4N 100, Aircraft oxygen systems and equipment. BS 4N 100-1, Design and installation.blankBS 4N 100-3:1999 BSI 389 Chiswick High Road London W4 4AL B
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