《BS-8202-2-1992.pdf》由会员分享,可在线阅读,更多相关《BS-8202-2-1992.pdf(16页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 8202-2: 1992 Coatings for fire protection of building elements Part 2: Code of practice for the use of intumescent coating systems to metallic substrates for providing fire resistance Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 00:59:21 G
2、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8202-2:1992 This British Standard, having been prepared under the direction of Technical Committee B/209, was published under the authority of the Standards Board and comes into effect on 15 September 1992 BSI 03-1999 The following BSI references relate t
3、o the work on this standard: Committee reference B/209/4 Draft for comment 88/11992 DC ISBN 0 580 21037 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee B/209, General building codes, to Subcommittee B/209/4, Coatings an
4、d claddings for insulation of buildings, upon which the following bodies were represented: Association of Metropolitan Authorities Association of Specialist Fire Protection Contractors and Manufacturers British Steel Industry Department of the Environment (Building Research Establishment) Department
5、 of the Environment for Northern Ireland Department of Transport (Marine Directorate) Fibre Cement Manufacturers Association Limited Institution of Structural Engineers Loss Prevention Council Warrington Fire Research Centre Amendments issued since publication Amd. No.DateComments Licensed Copy: Lon
6、don South Bank University, London South Bank University, Fri Dec 08 00:59:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8202-2:1992 BSI 03-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2References1 3Definitions1 4Validation1 5Choice of product2 6Materials, surfac
7、e preparation and finishing coats2 7Structural fire resistance3 8Durability4 9Site control4 10Maintenance6 Annex A (normative) Procedure for assessment of durability8 Figure 1 Orientation of specimen in weatherometer7 Table 1 Durability test programme5 List of references10 Licensed Copy: London Sout
8、h Bank University, London South Bank University, Fri Dec 08 00:59:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8202-2:1992 ii BSI 03-1999 Foreword This Part of BS 8202 has been prepared under the direction of Technical Committee B/209. It gives guidance on the use of intumescent coating systems
9、for the fire protection of structural elements. In 1983 the Fire Research Station and the Greater London Council prepared some guidelines for fire testing and evaluation of performance of intumescent coating systems. Subsequently the first draft of this standard was prepared by a group of manufactur
10、ers, in conjunction with the Fire Research Station. In an industry where public safety is the prime consideration, it is strongly recommended that manufacturers, suppliers and application specialists of intumescent coating systems have a quality assurance scheme conforming to BS 5750. As a code of p
11、ractice, this British Standard takes the form of guidance and recommendations. It should not be quoted as if it were a specification and particular care should be taken to ensure that claims of compliance are not misleading. A British Standard does not purport to include all the necessary provisions
12、 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 front cover, an inside front cover, pages i and ii, pages 1 to 10, an ins
13、ide 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. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 00:59:21 GMT+0
14、0:00 2006, Uncontrolled Copy, (c) BSI BS 8202-2:1992 BSI 03-19991 1 Scope This Part of BS 8202 gives recommendations for the use of intumescent materials as a coating to provide fire resistance and fire protection to metallic substrates. It includes: a) guidance on compatibility with primer systems
15、and finishing coats; b) guidance on appraisal of fire test data from standard cellulosic fires (see BS 476-20); c) methods of assessing durability and ageing; d) methods of application and site quality control procedures; e) recommendations for maintenance in use. NOTESimilar performance parameters
16、may be used for the selection of intumescent materials to provide fire resistance and fire protection to non-metallic substrates (e.g. wood, concrete and GRP), but they are outside the scope of this standard. 2 References 2.1 Normative references This Part of BS 8202 incorporates, by reference, prov
17、isions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this Part of BS 8202 only when incor
18、porated in it by updating or revision. 2.2 Informative references This Part of BS 8202 refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to
19、the latest editions. 3 Definitions For the purposes of this Part of BS 8202 the definitions given in BS 476-20:1987 and BS 5950-1:1990 apply together with the following. 3.1 intumescent coating coating which reacts under the influence of heat by swelling in a controlled manner to many times its orig
20、inal thickness and typically producing a layer of carbonaceous char or foam which acts as an insulating layer for the substrate 3.2 primer interface coating(s) between the intumescent coating (see 3.1) and the substrate 3.3 top sealer coat material applied to the surface of the intumescent coating a
21、s a protection against environmental degradation 3.4 decorative coat material used for decorative purposes only 3.5 intumescent coating system system comprising a primer (see 3.2), an intumescent coating (see 3.1), a top sealer coat (see 3.3) and/or a decorative coat (see 3.4) NOTEIt is possible tha
22、t a single coating may perform one or more of the functions described in 3.1 to 3.5. 3.6 mechanical retention use of mechanical system(s) to retain the coating system in-situ 3.7 thermal response factor (Hp/A) measure of heat sink by the ratio of section perimeter (in m) to cross-sectional area (in
23、m2) ranging from 26 (large heat sink) to 400 (small heat sink) with 180 being a typical average figure 4 Validation 4.1 Performance For specification purposes an appropriate independent validation should be provided to support the stated parameters of durability and fire resistance. Independent vali
24、dation should be based on fire test data derived from fully loaded fire tests in accordance with BS 476-21:1987, supplemented, if required, by fire test data determined in accordance with BS 476-20:1987. 4.2 Quality The manufacture and supply of intumescent coating materials should be supported by a
25、 quality system in accordance with BS 5750-2:1987. Application of the coating on site should be conducted to an equivalent level of quality assurance, adopting the criteria detailed in this standard. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 00:59:21 GMT+0
26、0:00 2006, Uncontrolled Copy, (c) BSI BS 8202-2:1992 2 BSI 03-1999 Any changes in the intumescent coating system or its method of application may affect its performance. Ideally, performance tests previously carried out should be repeated to ensure that the level of performance is not affected. Howe
27、ver, in practice this is not always possible because of the cost of some types of test, particularly fire resistance tests in accordance with BS 476-21, and because of the range of variables which may occur, e.g. raw materials may be obtained from several sources or a coating may be required to be u
28、sed with a large number of different primers. Thus changes in the chemical or physical nature of the components of the coating or their relative properties should be the subject of a full re-test in accordance with the appropriate performance standard whilst detail changes in the coating system may
29、be validated without repeating the appropriate performance test, using analytical laboratory tests and/or reduced scale performance tests. The report showing the justification for any assessment of changes in the coating system should be available for inspection where appropriate. NOTEIt is importan
30、t that any reduced scale tests can be shown to correlate with the tests in the appropriate performance standard. In many cases the manufacturer or supplier of the coating system would be the only source of this information. 5 Choice of product Intumescent coatings are versatile materials which will
31、cover areas of regular and irregular size and shape. However, each product should be chosen carefully so as to meet the particular requirements for a given end use. For example, in an external exposure situation or in damp conditions some products may be unsuitable or may require additional weather
32、protection. 6 Materials, surface preparation and finishing coats 6.1 Composition An intumescent coating should comprise active ingredients which react together in a controlled sequence to produce the phenomenon known as intumescence. NOTETypically these include the following. a) A catalyst which dec
33、omposes to liberate mineral acid, usually phosphoric acid. The most commonly used catalysts are ammonium polyphosphates. b) A carbonific agent which combines with the acid released by the catalyst to form a carbonaceous char. Typical carbonific agents are the common carbohydrates such as starch. c)
34、A resin system or binder which is designed to soften at the upper end of the reaction temperature range. d) A spumific agent which decomposes at the same time as the melting of the binder, and liberates large volumes of non-flammable gases such as carbon dioxide, ammonia and water vapour. These gase
35、s cause the binder to foam and expand to provide an insulating char many times the original coating thickness. 6.2 Surface preparation 6.2.1 General Fire test evidence should be obtained before overcoating any combination of surface coatings with an intumescent fire protection system. Where such evi
36、dence does not exist the substrate should be prepared as described in 6.2.2 and 6.2.3 or, if the coating is applied to a mechanically retained wire mesh, as described in 6.2.4. 6.2.2 Preparation of steel substrates Unless specified otherwise in a relevant fire test report, steel substrates should be
37、 prepared by removing scale and loose rust, using abrasive blasting to give at least second quality as defined in BS 7079-A1:1989. Alternative methods of surface preparation can be used provided it can be demonstrated that fire resistance and durability are not adversely affected. The surface should
38、 be free of dust. NOTE 1Swedish standard SS 05 59 00 1 is considered to give an acceptable standard of surface preparation. Oil, grease and similar contaminants should be removed by solvent cleansing. NOTE 2Guidance on the safe use of various solvents is given in HSE literature1). All traces of mois
39、ture, either from direct water attack or condensation, should be removed unless otherwise agreed. Reference should be made to the manufacturers instructions. 6.2.3 Priming The main function of a primer is to provide corrosion protection for the steel. It may also provide a bond for the intumescent c
40、oating. Care should be taken to ensure that the primer is compatible with the intumescent coating and that it will not adversely affect fire resistance. Different formulations of primer within the same generic group may produce different reactions with intumescent coatings. Primers should, therefore
41、, be identified by both the generic description and the product name. Acceptance should normally be based on fire test data in accordance with BS 476-20:1987. Where primers for which fire test data are not available are proposed, advice should be sought from the manufacturer or supplier of the intum
42、escent coating on the chemical compatibility and suitability for fire resistance applications. 1) A list of HSE publications may be obtained from Health and Safety Executive, Information Centre, Baynards House, 1-13 Chepstow Place, Westbourne Grove, London W2 4TF. Licensed Copy: London South Bank Un
43、iversity, London South Bank University, Fri Dec 08 00:59:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8202-2:1992 BSI 03-19993 Where a chemically incompatible primer has been identified, a barrier coating can be used to inhibit chemical reaction, provided that its use is supported by fire test d
44、ata (see clause 4). Where an unknown primer has already been applied, the primer type and thickness should be determined and checked prior to application of the coating. A check can be made on chemical compatibility at ambient temperatures by coating a small area with the intended intumescent coatin
45、g and investigating any reaction. However, such checks will not necessarily indicate compatibility in a fire situation. Ad hoc tests using a blow flame are not a reliable guide as the substrate may form such a large heat sink that any intumescence may be inhibited. Therefore on site testing should b
46、e supplemented by exploratory fire tests, using the heating regime in BS 476-20:1987 and a sample of materials and/or substrate taken from the site. Some intumescent coatings do not need to be primed for corrosion protection of the steel in a particular exposure situation (see Table 1). In case of d
47、oubt, reference should be made to the manufacturers. 6.2.4 Mechanical retention Where an intumescent coating is applied to a wire mesh and the mesh is mechanically retained by a supporting structure the recommendations in 6.2.2 and 6.2.3 may not apply. The primer should be compatible with the intume
48、scent coating but need not bond to the surface of the structure under fire test conditions, provided that the coating and mesh have been shown to be capable of achieving the required period of fire resistance independently of any bond to the substrate. 6.3 Finishing coats 6.3.1 Decorative and protec
49、tive surface finishes Where decorative or protective surface finishes are required, either initially or subsequently (owing to change of occupancy or use of buildings), it is essential to ensure that the applied finish is compatible with the intumescent coating and does not impair its performance. Some factors which may affect the performance are: a) chemical incompatibility; b) physical constraint of intumescence; c) excessive weight of coating; d) elasticity. A surfacing material should satisfy the requirements of any approving authority. NOTESuch requirements may inclu
链接地址:https://www.31doc.com/p-3736340.html