1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 7867 : 1997 ICS 13.220
2、.10; 49.040 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for Portable fire extinguishers for use in aircraftBS 7867 : 1997 This British Standard, having been prepared under the direction of the Health and Environment Sector Board, was published under the autho
3、rity of the Standards Board and comes into effect on 15 January 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference FSH/2 Draft for comment 96/540825 DC ISBN 0 580 25865 3 Amendments issued since publication Amd. No. Date Text affected Committees respo
4、nsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee FSH/2, Fire extinguishers, upon which the following bodies were represented: Association of Metropolitan Authorities British Aerosol Manufacturers Association British Compressed Gases Assoc
5、iation British Fire Consortium British Fire Services Association British Telecommunications plc Chief and Assistant Chief Fire Officers Association Consumer Policy Committee of BSI Consumers Association Civil Aviation Authority Department of the Environment (The Buying Agency) Fire Extinguishing Tra
6、des Association Home Office Independent Fire Equipment Distributors Association Institution of Fire Engineers London Fire and Civil Defence Authority Loss Prevention Council National Association of Fire Officers Nationwide Fire Services Society of Chemical Industry Society of Motor Manufacturers and
7、 Traders LimitedBS 7867 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover Foreword ii Specification 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Classification 1 5 Portability and ease of use 1 6 Discharge 1 7 Bracket 1 8 Test fire rating 1 9 Additional marking for ex
8、tinguishers and brackets 2 Annexes A (normative) Discharge tests 3 B (normative) Fire tests 3 Tables B.1 Dimensions of class A test fires 4 B.2 Dimensions of class B test fires 5 Figures B.1 Class A test fire front view 3 B.2 Class A test fire side view showing a 13A fire 4 List of references Inside
9、 back coverii BSI 1997 BS 7867 : 1997 Foreword This British Standard has been prepared by Technical Committee FSH/2 and specifies requirements for aircraft extinguishers additional to the requirements of BS EN 3 : Parts 1 to 6 : 1996. Together with BS EN 3, Part 1 to Part 6, and BS 7863, it supersed
10、es BS 5423, which is withdrawn. BS EN 3 only allows whole number sizes. However, for the purposes of this standard, for use in aircraft only, other sizes are permitted. Whilst not specified in BS EN 3-1, and for aircraft extinguishers only, 3A and 13B fire test ratings are allowed. Compliance with a
11、 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 6, an inside back cover and a back cover. BSI 1997 1 BS 7867 : 1997 1) These publications can be obtained from: EUROC
12、AE (European Organization for Civil Aviation Electronics), 11 Rue Hamlet, 75783 Paris Cedex, France; RTCA (Radio Technical Commission for Aeronautics), 1140 Connecticut Avenue N.W., Suite 1020, Washington, D.C. 20036, USA. 1 Scope This British Standard specifies requirements for portable extinguishe
13、rs to be used in aircraft additional to the requirements for all portable extinguishers given in BS EN 3 : Part 1 to Part 6. It details the type of extinguishers to be used in aircraft, and requirements for marking and fixing of extinguishers in aircraft. 2 Normative references This British Standard
14、 incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments
15、to or revisions of the cited publication apply to this British Standard only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 3 Definitions For the purposes of this British Standard
16、, the definitions given in BS EN 2 and BS EN 3 : Part 1 to Part 6 apply. 4 Classification Extinguishers intended for use in aircraft shall be classified as one of the following: a) type 1(C), which shall contain one of the extinguishing agents, other than powder, listed in table 1 of BS 7863 : 1996
17、as the extinguishing medium; or b) type 1(M), which shall contain halon 1211 as the extinguishing medium; or c) type 2, which shall contain water with a freezing point depressant as the extinguishing medium. NOTE. The classification (C) denotes application for civil use only; (M) denotes application
18、 for civil or military use. 5 Portability and ease of use Extinguisher of overall mass 5 kg or less shall be so designed that it is possible to perform the handling and operation tasks necessary to carry out the tests described in annexes A and B of BS EN 3-1 : 1996 using only one hand. 6 Discharge
19、6.1 Duration of discharge The duration of discharge shall be not less than 10 s when measured by the method described in A.1. 6.2 Discharge at an angle While being held upright and at an angle of 60 to the vertical position, extinguishers shall discharge not less than the following: a) for type 1: 7
20、5 % of the contents during the liquid phase of the extinguishing medium discharge (see also 7.2 for type 1(M); b) for type 2: 85 % of the contents; when tested by the method described in A.2. 7 Bracket 7.1 Extinguishers shall be provided with a mounting bracket which shall hold the extinguisher secu
21、rely against the appropriate acceleration test specified in ISO 7137 : 1995. NOTE. ISO 7137 : 1995 is an endorsement of publications EUROCAE/ED-14C and RTCA/DO-160C 1) . 7.2 After testing in accordance with 7.1, type 1(M) extinguishers shall conform to clause 6 and 7.5. 7.3 The bracket shall prevent
22、 inadvertent operation of the extinguisher by unaided manual means whilst in the bracket. 7.4 It shall not be possible to mount the extinguisher upside down in the bracket. 7.5 It shall be possible to remove an extinguisher of overall mass 5 kg or less from its bracket using one hand only. NOTE. The
23、 bracket design should be such as to minimize the possibility of inadvertent opening of the bracket release by snagging on clothing, etc. 8 Test fire rating 8.1 General Type 1 extinguishers shall have a minimum test fire rating of 21B, when tested in accordance with B.2. Type 1 extinguishers of nomi
24、nal charge not less than 1.5 kg shall have test fire ratings not less than 3A or 34B as appropriate, when tested in accordance with B.1 and B.2.2 BSI 1997 BS 7867 : 1997 2) The approving authority for British civil aircraft equipment is: Civil Aviation Authority Safety Regulation Group, Aviation Hou
25、se, South Area, Gatwick Airport, West Sussex, RH6 0YR. 8.2 Additional extinguishing requirements for type 1(M) extinguishers Type 1(M) extinguishers shall extinguish the 13B test fire when tested at (230 2) C and at (55 2) C by the method described in B.3. 9 Additional marking for extinguishers and
26、brackets In addition to the appropriate markings specified in clause 7 of BS EN 3-5 : 1996 and BS 7863 : 1996, aircraft extinguishers shall be marked with the full and empty masses in kilograms, with or without the operating head as appropriate. Brackets for type 1 extinguishers shall be marked to i
27、ndicate suitability for (C) or (M) application (see clause 7). NOTE. Purchasers or approving authorities 2) may specify requirements, additional to those of this standard, for aircraft extinguishers for general or particular application which make reference to the above standards or publications.BS
28、7867 : 1997 BSI 1997 3 Annexes Annex A (normative) Discharge tests A.1 Duration of discharge See 6.1. Carry out the test as described in annex A of BS EN 3-1 : 1996. A.2 Discharge of aircraft extinguishers at an angle See 6.2. Carry out the test as described in annex A of BS EN 3-1 : 1996, but hold
29、the extinguisher at 60 to the vertical position during the discharge. Do not move the extinguisher during the test. If the dip tube is asymmetrically placed or cut above the vertical axis of the extinguisher, hold the extinguisher in its least favourable attitude. Annex B (normative) Fire tests B.1
30、Class A fire performance B.1.1 Apparatus B.1.1.1 Metal frame support, (250 10) mm high, (900 10) mm wide and of a length equal to that of the test fire (within the tolerance limits). The steel frame (see figures B.1 and B.2) is constructed of 50 mm3 50 mm angle sections. B.1.1.2 Wooden sticks, made
31、of Pinus silvestris containing 12.5 % to 17.5 % moisture by mass, and of square section of side (39 2) mm. The moisture content of the sticks shall be determined using commercially available instruments which measure conductivity between two needle probes pushed into the sticks. NOTE. Some variation
32、 of reading may be obtained due to structural variation of the timber and the direction of the grain. This type of instrument should therefore be calibrated in case of doubt by drying samples of the sticks, cut to convenient length, to constant mass at (103 2) C, and by weighing them at 24 h interva
33、ls. The moisture content expressed as a percentage is given by the following equation: Percentage moisture = 3 100 Initial mass2 dry mass dry mass The wooden sticks shall be stacked in 14 layers on the metal frame(s) as shown in figures B.1 and B.2. Figure B.1 Class A test fire front view4 BSI 1997
34、BS 7867 : 1997 Figure B.2 Class A test fire side view showing a 13A fire The sticks in each layer shall be spaced at nominal 100 mm centres with nominal 61 mm gaps between the sticks. The sticks laid transversely (layers 2, 4, 6, 8, 10, 12 and 14) shall have a length of (500 10) mm. The sticks laid
35、longitudinally (layers 1, 3, 5, 7, 9, 11 and 13) shall have a length equal to the test fire length given in table B.1, with a permissible deviation of 10 mm. B.1.1.3 Lighting fuel, consisting of an aliphatic hydrocarbon having an initial boiling point of not less than 88 C and a final boiling point
36、of not more than 105 C. NOTE. Typical fuels meeting this requirement are heptane and certain solvent fractions sometimes referred to as commercial heptane. B.1.1.4 Lighting tray, being (100 10) mm longer than the nominal length of the test fire, of width (600 10) mm and depth (100 10) mm. NOTE. Long
37、 lighting trays are difficult to handle, and it may be convenient to use a number of smaller trays to give the required length, arranged with no appreciable gap between the trays. B.1.2 Test fire dimensions The test fire shall be the appropriate designated test fire specified in table B.1. NOTE. Eac
38、h test fire is designated by a number followed by the letter A. The designation number of the test fire represents: a) the nominal length of the test fire in decimetres, i.e. the nominal length of the wooden sticks arranged in the longitudinal direction of the test fire; and b) the number of 500 mm
39、wooden sticks for each layer arranged in the transverse direction of the test fire. Table B.1 Dimensions of class A test fires Designation of test fire Length of test fire m Number of 500 mm wooden sticks in each transverse layer 3A 0.3 3 5A 0.5 5 8A 0.8 8 13A 1.3 13 BSI 1997 5 BS 7867 : 1997 B.1.3
40、Test fire location Locate the test fire indoors and sheltered from draughts, in a test chamber that does not impede the natural development of the test fire or effective fire fighting. B.1.4 Procedure The procedure is as follows. a) Pour water into the lighting tray(s) to form a layer at least 3 mm
41、deep over the whole base of the tray, then add sufficient fuel to give an additional depth of 5 mm. b) Ignite the fuel. c) s after fuel ignition, withdraw the lighting 120 220 +10 tray(s) from the crib. d) Permit the crib to burn for a further 6 min, making a total burn time of 8 min. e) Operate the
42、 extinguisher and apply it to the test fire. The extinguishers may be discharged continuously or in successive bursts. NOTE. The operator may move round the fire to obtain the best results. B.1.5 Result If the test fire is put out, the extinguisher has passed the test. B.2 Class B fire performance B
43、.2.1 Apparatus B.2.1.1 Test fire trays, made of welded sheet steel and of circular cylindrical shape (dimensions are given in table B.2), and with vertical sides. The bases of the trays are set horizontal above, or level with, the surrounding ground. NOTE. Reinforcement of the base of the large test
44、 fire trays will be necessary to minimize distortion. In such cases it will be necessary to ensure that the undersides of the trays are not exposed to the atmosphere. B.2.1.2 Lighting fuel, consisting of an aliphatic hydrocarbon having an initial boiling point of not less than 88 C and a final boili
45、ng point of not more than 105 C. NOTE. Typical fuels meeting this requirement are heptane and certain solvent fractions sometimes referred to as commercial heptane. B.2.2 Test fire dimensions The test fire shall be the appropriate designated test fire specified in table B.2. NOTE. Each test fire is
46、designated by a number followed by the letter B. The designating number of the test fire represents the volume of the liquid in litres contained in the tray. The area of the test fire tray expressed in square decimetres is given by this number multiplied by p . The depth of liquid in the trays is ap
47、proximately 30 mm, with a water base to the fuel. Details of class B test fires are contained in table B.2. B.2.3 Test fire location Carry out test fire indoors in a building which will not impede the natural development of the fire or outdoors but with a wind speed not exceeding 3 m/s. Table B.2 Di
48、mensions of class B test fires Designation Minimum volume of fluid Dimensions of test fire tray Fuel Water Diameter (measured at rim) Depth Nominal thickness of walls Approximate area of fire llm mm mm mm 2 13B 10 3 720 10 150 10 2.0 0.41 21B 15 6 920 10 150 10 2.0 0.66 34B 25 9 117 10 150 10 2.5 1.
49、076 BSI 1997 BS 7867 : 1997 B.2.4 Procedure The procedure is as follows: a) Add the appropriate volume of fuel and water as specified in table B.2. Add additional water to obviate any distortion of the tray, subject to there being a minimum of 15 mm depth of fuel at any one point and a maximum depth of liquid of 50 mm at any point on the periphery of the tray. b) For the testing of foam, halon or vaporizing liquid extinguishers, use fresh fuel for each test. When testing extinguishers of other types, it is not necessary to
