1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Part 1: Design and installationICS 49.090Aircraft oxygen systems and equipment BRITISH STANDARD AER
2、OSPACE SERIESBS 4N 100-1: 1999Incorporating Amendments Nos. 1 and 2BS 4N 100-1:1999This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 October 1999 BSI 2007ISBN 9
3、78 0 580 59299 4Amendments issued since publicationAmd. No. Date Comments15951 October 2005 New subclause 9.3 added.17217 31 July 2007 See forewordCivil Aviation AuthorityHealth and Safety ExecutiveMinistry of DefenceSociety of British Aerospace Companies Limited South Bank UniversityCommittees resp
4、onsible for this British StandardThe preparation of this British Standard was entrusted to Technical Committee ACE/38, Aircraft oxygen equipment, upon which the following bodies were represented:British AirwaysBritish Compressed Gases AssociationBS 4N 100-1:1999 BSI 2007ContentsPageCommittees respon
5、sible Inside front coverForeword ii1Scope 12 Normative references 13 Pressure ranges 14 General 25 Materials 36 Couplings and connections 37Filters 48 Vent and relief devices 49Presure joints 510 Moisture and ice accretion 511 Control knobs and switches 612 Strength of materials 613 Soldering, brazi
6、ng and welding 714 Cleaning processes 715 Installation of equipment 716 Identification marking 7Bibliography 8Table 1 Pressure ranges 1Table 2 Recommended clearances 2iBS 4N 100-1:1999iispecifies the general design and installation of oxygen systems and equipment for use on aircraft and ground suppo
7、rt equipment. It partially supersedes BS 3N 100 which is withdrawn upon publication of all seven parts.BS 4N 100 consists of the following seven separate parts: Part 1: Design and installation; Part 2: Tests for the compatibility of materials in the presence of oxygen; Part 3: Testing of equipment a
8、nd systems; Part 4: Guide to the physiological factors; Part 5: Guide to fire and explosion hazards associated with oxygen; Part 6: Guidance 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 aerosp
9、ace series standard is indicated by a prefix number.Compliance with a British Standard cannot confer immunity fromlegal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover.The BSI copyright noti
10、ce displayed in this document indicates when the document was last issued.The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to text carry the number of the amendment. For example, text altered by Amendment No. 2 is indicated by
11、#$. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.ForewordThis Part of BS 4N 100 has been prepared by Technical Committee ACE/38 and BSI 2007BS 4N 100-1:19991 ScopeThis part of BS 4N 100 specifies the genera
12、l design requirements for airborne oxygen breathing systems, including oxygen storage and generation equipment and ground support equipment. New tests are specified for compatibility of materials for use in the presence of oxygen. This part also provides some guidance and recommendations on the desi
13、gn and installation of items of equipment for use in oxygen systems.NOTE The guidance and recommendations contained herein may be used equally well in non-aerospace applications.In addition, for all equipment for aircraft oxygen systems, conformance to the relevant parts, sections and sub-sections o
14、f BS G 100 is specified.2 Normative referencesThe 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 revisions of, any of these publications do not app
15、ly. For undated references the latest edition of the publication referred to applies.BS C 5, Specification for mating dimensions for liquid oxygen replenishment couplings.BS C 20, Specification for aircraft gaseous oxygen replenishment connection (inch dimensions).BS G 100-2-3, Specification for gen
16、eral requirements for electrical equipment and indicating instruments for aircraft Environmental conditions.BS G 100-2-3-3.3, Specification for general requirements for electrical equipment and indicating instruments for aircraft Mould growth.BS N 2, Specification for general requirements for constr
17、uction and performance of airborne chemical oxygen generators.BS N 100-2, Aircraft oxygen systems and equipment Tests for the compatibility of materials in the presence of oxygen.BS N 100-3, Aircraft oxygen systems and equipment Methods of testing equipment and systems.BS N 100-5, Aircraft oxygen sy
18、stems and equipment Guide to fire and explosion hazards associated with oxygen.BS N 100-6, Aircraft oxygen systems and equipment Guidance and recommendations on the selection of materials for use with oxygen.BS N 100-7, Aircraft oxygen systems and equipment Guide to cleaning, labelling and packaging
19、.BS M 23, Specification for an identification scheme for pipelines.3 Pressure rangesThe absolute pressure ranges used in this standard shall be specified as shown in Table 1.Table 1 Pressure rangesRange PressureMPa1)Pressure (pounds per square inch)(psi)Very low From 0 up to 0.4 From 0 up to 60Low F
20、rom 0.4 up to 1.5 From 60 up to 220Medium From 1.5 up to 4.1 From 220 up to 600High From 4.1 up to 20.7 From 600 up to 3 000Very high Above 20.7 Above 3 000 BSI 200711)1 MPa = 1 MN/m2 = 145.038 psi = 10 bar.BS 4N 100-1:19994 General4.1 Fixed systems shall be installed so that components and pipeline
21、s are as follows:b) located so that accumulation of oxygen will not cause a hazard;c) clear of moving controls and other mechanisms;d) bonded to earth.In addition, fixed systems shall also be installed so that components and pipelines are:1) routed to minimize the number of joints, the lengths of su
22、pply pipes and the number of sharp bends;2) protected against the ingress of grease and other contaminants;3) supported and protected against adverse effects of vibration and acceleration.NOTE Parts of a system subject to medium, high or very high oxygen pressures, located in crew and passenger comp
23、artments, shall be either routed or physically protected to prevent accidental damage.4.2 Thin sections or foils shall not be used except for filters (see clause 7) or similar features. There shall be no sharp edges or burrs within the oxygen stream.NOTE Under high velocity oxygen flow conditions, s
24、harp edges, etc. may be ignited by high temperatures being generated.4.3 Items fitted to or adjacent to personnel shall have no sharp corners, edges or protrusions which could cause personal injury or catch on clothing or equipment.4.4 Chemical oxygen generators and their installation shall conform
25、to BS N 2.4.5 Individual components shall be compatible with the rest of the system. Suitability of components shall be ensured during their design, development and qualification test.NOTE System design should encompass the following criteria:a) container size, storage pressure, system flow characte
26、ristics, the need for a reducing valve and the regulator inlet working pressure range. All these factors are interlinked and have to be considered together to produce the optimum overall storage and supply system;b) the pressure/flow dynamics of the system, especially with regard to the stability of
27、 inspiratory flows. The regulator, low and very low pressure delivery pipelines, mask and the human respiratory system are usually the critical, interacting items;c) the acoustic characteristics, that is the “breathing noise” produced in any system which includes a mask-mounted microphone. Here the
28、regulator, low and very low pressure pipelines and mask are usually the critical, interacting items;d) the integration of certain components such as the regulator and associated pipelines, with the seat, the clothing and any personal equipment;e) condition of handling, storage and use, so that equip
29、ment performance is not adversely affected;f) safety, reliability and maintainability.4.6 The system shall include emergency oxygen equipment for passengers and crew.NOTE 1 It is essential that emergency oxygen equipment should be immediately available and in a serviceable condition at all times.NOT
30、E 2 Physiological considerations are described in detail in BS N 100-4.4.7 Where blind or intuitive operation of a handwheel or rotary lever is required, the sense of operation #a) installed in such a way that clearance is provided with other systems or parts of the aircraft. Table 2 provides recomm
31、ended figures that shall be achieved as far as is practically possible within thelimitations of the installation and/or aircraft design. If smaller clearances are unavoidable, these shallbe kept to a minimum and the oxygen system provided with protective shields or sleeves;$ #Table 2 Recommended cle
32、arances Feature Clearance mm Hydraulic, oil and fuel systems 127 Electrical wiring, heat conduits and heat emitting equipment 127Flexible moving parts of the aircraft 51Rigid parts of the aircraft (except clamps) 13 Charging connections (clearance diameter) 127$ 2 BSI 2007shall be such that an upwar
33、ds or forwards movement of a lever opens or increases the supply. Shut-off valves shall be opened by an anti-clockwise movement of the handwheel or rotary lever and closed by a clockwise movement.NOTE Shut-off valves should be designed so that when they are operated, the rate of pressure rise within
34、 the system does not result in the development, by adiabatic compression, of a temperature high enough to ignite materials in the system.BS 4N 100-1:19995 Materials5.1 Material compatibility in presence of oxygen5.1.1 GeneralSelection of metallic and non-metallic materials to be used in gaseous oxyg
35、en or oxygen rich atmospheres shall conform to BS N 100-6.5.1.2 Protective treatmentWhere protective treatment is applied to parts of the system, it shall not affect the ability of the material to conform to BS N 100-2.5.2 Metallic materials5.2.1 Adjacent metals shall be electrolytically compatible.
36、NOTE At extremes of temperature the dimensions and properties of many metals change. Due account of this should be taken, particularly when designing stressed components.5.2.2 Where relative movement occurs between adjacent parts, as on assembly or during normal use, no loose particles shall be gene
37、rated.5.3 Non-metallic materialsNOTE 1 At the temperature of liquid oxygen, most non-metallic materials become brittle. This factor should be borne in mind in the design of low-temperature components.NOTE 2 Materials that may crack or shatter under intense thermal shock conditions should not be used
38、 in liquid oxygen systems, e.g. during system filling.NOTE 3 At extremes of temperature the dimensions and properties of many non-metallic materials change, for which allowance should be made, particularly when designing stressed components.5.3.1 Non-metallic materials shall be odourless and non-tox
39、ic.5.3.2 Dyes and pigments used for colouring shall be fast in the presence of human perspiration, or exhaled breath.5.3.3 Non-metallic materials, when worn in contact with the skin, shall be non-dermatitic, non-abrasive and hypo-allergenic.5.3.4 All finishes shall be non-flaking.5.3.5 Lubricants, a
40、nti-seizing, sealing and locking agents, shall conform to BS N 100-6.5.3.6 Non-metallic materials shall not support fungus or mould growth when tested in accordance with BS 3G 100-2: Section 3: Subsection 3.3.6 Couplings and connections6.1 Replenishment couplings6.1.1 In-situ replenishment facilitie
41、s shall be provided with means to prevent excessive rates of charging resulting in dangerously high temperatures within the system.NOTE 1 In gaseous systems, protect the first non-return valve to prevent the main supply supporting combustion immediately downstream of the charging point. A swept bend
42、 with an angle of not less than 90 and with a radius five times the outside diameter of the conducting pipe may be interposed, for example, immediately downstream of the charging point and filter (if fitted).NOTE 2 Special care should be taken with piping geometry, so that if a burn through should o
43、ccur at a feature such as a bend, the resulting torching flame should not impinge on nearby parts in such a manner as to exacerbate the hazard.6.1.2 In-situ replenishment facilities provided for the primary system, shall be accessible from outside the aircraft and isolated from other service connect
44、ions to prevent cross-contamination.6.1.3 The dimensions of replenishment couplings for the supply of liquid oxygen to aircraft shall conform BSI 20073to BS C 5.BS 4N 100-1:19996.1.4 The dimensions of replenishment couplings for the supply of high pressure gaseous oxygen to aircraft shall conform to
45、 BS C 20.NOTE Very high pressure gaseous storage systems require special replenishment procedures. For such systems a different form of replenishment coupling should be used in conjunction with special replenishment equipment.6.2 Equipment connections6.2.1 On units having more than one connection, t
46、he unions shall be arranged to prevent incorrect connections.6.2.2 Connections used only for servicing and testing shall be of a different type from those used for other purposes.6.2.3 Connections shall be locked to prevent inadvertent disconnections.6.3 Quick disconnection couplings6.3.1 Quick disc
47、onnection couplings shall be capable of being made, locked and separated with gloved hands.6.3.2 If the connection fails to lock, the two halves of the connection shall be self-separating and be installed to provide evidence of its malfunction to the user.NOTE Self-sealing couplings should be design
48、ed to minimize oxygen spillage or leakage during coupling or uncoupling.6.3.3 Where electrical connections are combined with the coupling, the oxygen circuit shall be complete and shall be sealed before the electrical connections are made or broken.7 Filters7.1 Filters shall be provided at the reple
49、nishment point to prevent the ingress of particulate contaminants greater than 50 4m (nominal).7.2 Filters shall be provided in oxygen system components to prevent contamination of, or damage to, valves and mechanisms. Filters shall be readily accessible for replacement or cleaning during overhaul.NOTE 1 Filters should be provided immediately upstream of valves and controlling orifices.NOTE 2 Filters are usually made of very small diameter metallic wire, and as such, a very slight addition of heat can cause
