1、BRITISH STANDARD BS7157:1989 Method of test for Ignitability of fabrics used in the construction of large tented structures UDC 677037:614.841.41:796.54.006.02:620.1BS7157:1989 This British Standard, having been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was
2、 published underthe authority oftheBoardof BSI and comes into effect on 30November1989 BSI11-1999 The following BSI references relate to the work on this standard: Committee reference TCM/30 Draft for comment87/44417 DC ISBN 0 580 17560 X Committees responsible for this British Standard The preparat
3、ion of this British Standard was entrusted by the Textiles and Clothing Standards Policy Committee (TCM/-) to Technical Committee TCM/30, upon which the following bodies were represented: Association of Heavy Textile Proofers of Great Britain Bolton Institute of Higher Education British Burn Associa
4、tion British Carpet Manufacturers Association Ltd. British Clothing Industry Association British Plastics Federation British Steel Corporation British Textile Employers Association Chemical Industries Association Chief and Assistant Chief Fire Officers Association City of Bradford Conditioning House
5、 Consumer Policy Committee of BSI Department of the Environment Building Research Establishment Department of the Environment Property Services Agency Department of Trade and Industry (Consumer Safety Unit, CA Division) Design Council Home and Contract Furnishing Textiles Association Home Office Int
6、ernational Wool Secretariat Lambeg Industrial Research Association London Scientific Services Man-made Fibres Producers Committee Ministry of Defence Soap and Detergent Industry Association Society of Motor Manufacturers and Traders Limited Textile Institute Textile Research Council Warrington Fire
7、Research Centre The following body was also represented in the drafting of the standard, through subcommittees and panels: Made-Up Textiles Association Amendments issued since publication Amd. No. Date of issue CommentsBS7157:1989 BSI 11-1999 i Contents Page Committees responsible Inside front cover
8、 Foreword ii 1 Scope 1 2 Definitions 1 3 Health and safety of operators 1 4 Apparatus 1 5 Conditioning and testing 1 6 Test specimens 1 7 Test procedure 1 8 Test report 3 Appendix A Recommendations to specifiers 4 Figure 1 Frame dimensions (nominal) 2 Figure 2 Test specimen (minitent) dimensions (no
9、minal) 3 Publications referred to Inside back coverBS7157:1989 ii BSI 11-1999 Foreword This British Standard has been prepared under the direction of the Textiles and Clothing Standards Policy Committee. Fabrics used in the manufacture of large tents and marquees arranged on a framework to represent
10、 the walls and roof of a tented structure are subjected to a range of ignition sources. The attention of specifiers is drawn to Appendix A which gives recommendations on the extent of hole formation which can be tolerated with regard to safety, related to the size of the ignition source used. A Brit
11、ish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fron
12、t cover, an inside front cover, pagesi andii, pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS7157:1989 BSI 11-1999 1 1 Scope Thi
13、s British Standard describes a method of test for the ignitability of fabrics used in the construction of large tented structures such as marquees, large tents, temporary buildings, awnings and any other structure utilizing large areas of a flexible membrane other than air supported structures. NOTE
14、The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard the definitions given in BS6373 and BS5852-2 apply. 3 Health and safety of operators NOTEThere is considerable risk involved in this test procedure
15、 and it is essential that appropriate precautions are taken. 3.1 Enclosure For safety, tests shall be conducted in an enclosure of at least30m 3volume, so that the tester is not exposed to the fumes. NOTEIt is recommended that the operator does not remain within the test enclosure during the test bu
16、t views the test through an observation window. 3.2 Extinguishers Adequate means of extinguishing the samples shall be provided. 4 Apparatus 4.1 Test frame The test frame is illustrated in Figure 1 and consists of metallic rod arranged to represent main and side walls and roof sections of the tent s
17、tructure. The frame shall be constructed from steel rod of circular cross section of6mm nominal diameter. The nominal dimensions of the frame shall be as given in Figure 1. The frame shall be constructed slightly smaller than the test specimen (minitent) but by not more than10mm in any dimension. 4.
18、2 Ignition sources The range of ignition source used in this test shall be pinewood (Pinus Sylvestris) cribs: ignition sources4 to7 as described in BS5852-2. 5 Conditioning and testing 5.1 Conditioning The fabric specimens to be tested and the cribs shall be conditioned immediately before the test f
19、or72h in indoor ambient conditions and then for at least16h in an atmosphere with a temperature of20 5 C and a relative humidity of65 5%. 5.2 Testing Tests shall be performed in a draught-free environment with a temperature of15 C to30 C and a relative humidity of55 20%. 6 Test specimens 6.1 General
20、 The test specimen (minitent) shall be representative of the fabric used and all raw edges shall be hemmed. Three specimens shall be tested for each fabric. 6.2 Dimensions The fabric test specimen (minitent) of nominal dimensions shown in Figure 2 shall consist of two side sections and a back and ro
21、of section with an overhang to facilitate attachment to the frame. The specimen shall be sewn or welded at the corners denoted in Figure 2 using an overlapping seam and all seams and hems shall be between25mm and50mm in width. The specimens shall fit over the framework without stretching or bulging
22、in any area. The front of the specimen shall be open except for a100mm overhang at the top edge to ensure that it is retained on the test frame and adequate tension is maintained. The bottom of each side shall be secured to the frame. 7 Test procedure WARNING. All tests should be conducted in a suit
23、able enclosure to ensure the safety of personnel. 7.1 Preparation 7.1.1 Ensure that the means of extinguishment are close to hand (see3.2). 7.1.2 Arrange the fabric specimen over the test frame ensuring that there is no bulging or stretching in any direction. 7.1.3 Place the crib ignition source at
24、inside corner F as shown in Figure 2 touching the rear and side walls. 7.2 Procedure 7.2.1 Ignite the crib as described in BS5852-2 and withdraw from the enclosure. 7.2.2 Observe the progress of combustion and record any evidence of unusual behaviour such as the formation of flaming droplets or glow
25、ing. 7.2.3 If the specimen is completely consumed or continues to flame after the crib has been completely consumed record that ignition had occurred.BS7157:1989 2 BSI 11-1999 7.2.4 If the specimen is not completely consumed, or does not continue to burn after the crib has been completely consumed,
26、record any extent of hole formation assuming the crib to be in corner F as follows. a) Rear section (EFGH). Measure the distance in millimetres from the rear edge EH to a line drawn through the edge of any hole nearest to EH and parallel to it, x. Extent of hole =830x = x 1 b) Side section (BCFG). M
27、easure the distance in millimetres from the front edge BC to a line drawn through the edge of any hole nearest BC and parallel to it, y. Extent of hole =830y = y 1 c) Roof section (ABGH). Measure the distance in millimetres from the top edge AB to a line drawn through the edge of any hole nearest AB
28、 and parallel to it, z. Extent of hole =1 174z = z 1 If the dimensions of any specimen differ from the nominal values shown in Figure 2 substitute the appropriate figures for those given in the above calculations. 7.2.5 If the specimen is not completely consumed, but does continue to burn after the
29、crib has been completely consumed, record the extent of hole formation when the burning is extinguished, as in7.2.4. Figure 1 Frame dimensions (nominal)BS7157:1989 BSI 11-1999 3 8 Test report The test report shall state that the results relate only to the ignitability of the materials under the part
30、icular conditions of test; they are not intended as a means of assessing the full potential fire hazard of the materials in use. It shall also include the following information: a) a full description of the test specimen; b) a description of the ignition source(s) used and the result “ignition” or “
31、non-ignition” for each source; c) the extent of damage to the test specimen (seeAppendix A); d) the number and date of this British Standard, i.e.BS7157:1989. The report shall also contain any feature of the test specimens or procedures which may have affected the result. These features include: a)
32、conditioning of the specimen and ignition source(s); b) special features of burning, e.g.formation of flaming droplets or glowing; c) timing of major events, e.g.burning time of the crib, total time for destruction of test specimen. Figure 2 Test specimen (minitent) dimensions (nominal)BS7157:1989 4
33、 BSI 11-1999 Appendix A Recommendations to specifiers A.1 The method of test described in this standard has been devised for use as a type approval test and not as a quality control test. A.2 After extensive ignitability trials employing different size ignition sources it is recommended that an appr
34、opriate level of safety for large tented structures is obtained by using a number6crib ignition source and that the extent of hole formation formed when this ignition source is used should not exceed20%when calculated as follows: A.3 For more severe hazard areas a number7crib ignition source may be
35、used when the extent of hole formation should not exceed33%. Extent of hole x 1 y 1 z 1 + 2 834 - = 100 BS7157:1989 BSI 11-1999 Publications referred to BS6373, Glossary of terms relating to burning behaviour of textiles and textile products. BS5852, Fire tests for furniture. BS5852-2, Methods of te
36、st for the ignitability of upholstered composites for seating by flaming sources. BS7157:1989 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at
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