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1、BRITISH STANDARD BS 8303-3: 1994 Installation of domestic heating and cooking appliances burning solid mineral fuels Part 3: Recommendations for design and on site installation IMPORTANT NOTE. Before reading this Part it is essential to read BS 8303-1: Specification for the design of installations a
2、nd BS 8303-2: Specification for installing and commissioning on-site, issued separately. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:10:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8303-3:1994 This British Standard, having been prepared under the dire
3、ction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1995 BSI 02-1999 First published, as CP 403, August 1952 Second edition, October 1974 Third edition, as BS 8303, June 1986 Fourth edition, January 1995 The following BS
4、I references relate to the work on this standard: Committee reference RHE/28 Draft for comment 91/82857 DC ISBN 0 580 22713 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Engineering Sector Board to Technical Committee RHE/28, upon wh
5、ich the following bodies were represented: Association of British Solid Fuel Appliance Manufacturers British Ceramic Tile Council British Coal Corporation Consumer Policy Committee of BSI Department of Energy (Energy Efficiency Office) Department of the Environment HETAS Ltd. Incorporated Associatio
6、n of Architects and Surveyors Low Temperature Coal Distillers of Great Britain Ltd. METCOM National Fireplace Manufacturers Association National Society for Clean Air Real Fire Association Solid Smokeless Fuels Federation Waterheater Manufacturers Association Coopted members Amendments issued since
7、publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:10:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8303-3:1994 BSI 02-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3References1
8、4Chimney connection for free standing appliances1 5Securing an appliance1 6Air inlets1 7Sealing of joints2 8Flue size3 9Separation from combustible material3 10Noise8 11Energy economy and heat retention8 12Alternative flue pipe construction8 13Gas ignition9 14Firebacks and infill9 15Testing an insta
9、llation9 Figure 1 Typical flue connection of a freestanding cooker or independent boiler2 Figure 2 Dimensions of a fireplace recess4 Figure 3 Dimensions of a constructional hearth5 Figure 4 Combustible material under hearth5 Figure 5 Positioning of appliance on a hearth6 Figure 6 Distance of an appl
10、iance from combustible material6 Figure 7 Separation of a flue pipe from combustible material7 Table 1 Composition proportions for in-fill9 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:10:04 GMT+00:00 2006, Uncontrolled
11、Copy, (c) BSI BS 8303-3:1994 ii BSI 02-1999 Foreword This Part of BS 8303 has been prepared under the direction of the Engineering Sector Board and together with BS 8303-1 and BS 8303-2 supersedes BS 8303:1986 which is withdrawn. BS 8303 covers the installation of domestic heating and cooking applia
12、nces burning solid mineral fuel. BS 8303-1 details the design specification to be followed by the installation designer, when developing an acceptable appliance installation design for the particular application. BS 8303 specifies the practices to be followed when installing the appliance in accorda
13、nce with the design specification. It reflects good site supervision and working practices. This Part of BS 8303 gives guidance to the designer and installer on options to be identified and the methods of achieving a safe and satisfactory installation. BS 8303 does not deal with design or installati
14、on of hot water heating systems or hot water supply systems. However, where the appliance involves hot water services, attention is drawn to BS 5449:1990. Attention is drawn to the need to ensure compliance with all local and general regulations as they affect the installation, including the followi
15、ng: A British 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. planning permission; Building Regulat
16、ions 1; Clean Air Act 2; Gas Safety (Installation and Use) Regulations 3. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendmen
17、ts 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 06:10:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8303-3:1994 BSI 02-19991 1 Scope This Part of BS 8303 gives guidance
18、and recommendations on the design and installation of domestic heating and cooking appliances burning solid mineral fuels designed in accordance with BS 8303-1:1994 and installed in accordance with BS 8303-2:1994. 2 Definitions For the purposes of this Part of BS 8303, the definitions given in BS 18
19、46-1:1994 apply. 3 References 3.1 Normative references This Part of BS 8303 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 d
20、ated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this Part of BS 8303 only when incorporated in it by amendment or revision. For undated references, the latest edition applies, together with any amendments. 3.2 Informative r
21、eferences This Part of BS 8303 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 the latest editions. 4 Chimney connection for free stand
22、ing appliances Where a freestanding appliance is to be installed without the use of a fireplace recess no part of the chimney should be supported by the appliance. This is neccessary so that if an appliance needs to be removed for any reason it can be achieved without major disturbance to the chimne
23、y. Masonry chimneys can be built up from ground level, a fireplace recess or part of the wall structure of the building. The connection between the appliance and the chimney is achieved via a flue pipe entry either vertically from underneath Figure 1 a) or into an opening in the side of the flue Fig
24、ure 1 b) or Figure 1 c). A factory made chimney is commonly supported on ceiling joists. In this case care should be taken that the length of chimney below the lowest support is correctly secured to the section above it and not allowed to rest on the appliance or any flue pipe. 5 Securing an applian
25、ce The appliance should be secured to prevent movement which could cause joint separation at the flue pipe or chimney connection, and for open fires, at the hearth and fire surround. Joint separation could result in leakage of air into the flue or allow combustion products to escape into the buildin
26、g. Securing is particularly important where an appliance relies for its connection to the flue on a seal between the appliance and the fireplace recess to prevent any leakage. Movement of the appliance can occur for a variety of reasons such as vigorous operation of the de-ashing mechanism or therma
27、l expansion and contraction. The manufacturers recommendation for fixing should be followed. The most common method is to secure the base of the appliance to the hearth using rag bolts or screws into non-combustible plugs. 6 Air inlets The combustion air inlet sizes specified in 5.3 of BS 8303-1 are
28、 the minimum that are required. Open fires require more air than closed appliances because of the additional air that enters the appliance above the firebed. The air is needed for secondary combustion and to prevent flue gas spillage from the fire. The throat created by the fireback and throat linte
29、l are specially shaped to assist the flow into the flue. The size of the combustion air inlets takes into account the fact that rooms are not usually airtight even when all doors and windows are closed. Consequently there is no requirement to have an air inlet for closed appliances with an output le
30、ss than 5 kW, as enough adventitous air is usually available for satisfactory operation. The ideal position for the air inlets is adjacent to the fireplace recess. Where it is not desirable to provide inlets from outside directly to this location so as to avoid cold draughts, a suitable place of ent
31、ry is into an unoccupied area such as the hall. In this way there is an element of preheating of the air before it enters the living areas. Apertures of at least the size specified in 5.3 of BS 8303-1 should be provided in partitions between the air inlet and the appliance in order to allow an unres
32、tricted route for the air to reach the appliance. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:10:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8303-3:1994 2 BSI 02-1999 Some appliances are designed for use with underfloor air supplies ducted to the fir
33、e. The use of the underfloor system of ducting may also be suitable for other fires. Where ducting cannot readily be provided within or under a floor an alternative technique is to duct air from the roof space. Where this ducting passes through other parts of the house, it should be installed in a m
34、anner that provides a rated resistance to the spread of fire (see 5.2 of BS 8303-1) appropriate to the application; in single occupancy dwellings, materials having a 30 minute rating is usual, in dwelling containing flats (multiple occupancy) 90 minutes may be required. Open fires tend to induce con
35、siderable air changes in the room and, to minimize this effect, it is recommended that provision be made for restricting the throat. This may be done with an insertable throat restrictor conforming to BS 3376:1991. Other forms of adjustable throat may be used provided that this allows for flue sweep
36、ing. 7 Sealing of joints For a successful installation, joints should be sealed in order to prevent the ingress of unwanted air into the chimney and to reduce the risk of combustion products escaping into living areas, and, in the case of an open fire, to ensure that control of combustion is possibl
37、e. In most instances the seal can be made with the use of a soft, flexible non-combustible rope or tape of thicknes suitable for the size of gap which it needs to fill. The rope must be well tamped into the gap but be flexible enough to allow some movement of the joint due to expansion and contracti
38、on. The rope can be held in place with a covering of fire cement. This technique is especially recommended for jointing the flue pipe to the appliance, the raft lintel or register plate. In the latter cases the joint could benefit from the use of a clamping ring which squeezes the rope against the f
39、ace. Some manufacturers supply a purpose-made flue pipe for this which has lugs with screws to apply the pressure on the clamping ring and hence the rope. Figure 1 Typical flue connection of a freestanding cooker or independent boiler Licensed Copy: London South Bank University, London South Bank Un
40、iversity, Fri Dec 08 06:10:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8303-3:1994 BSI 02-19993 Special attention should be given to ensuring the presence of a flexible seal around the ashpit area of an open fire. This includes the base where the fire sits on the hearth as well as the side of t
41、he fire where it meets the fireplace surround. Where a flue pipe enters a chimney through a hole in the chimney wall it is neccessary to sleeve the hole and seal the flue pipe into the sleeve. This may be achieved by cementing in a short length of metal pipe with an inside diameter at least 25 mm la
42、rger than the outside diameter of the flue pipe. Both ends of the sleeve should be cut to the angle formed with the chimney. The space between the flue pipe and the sleeve should be well caulked with several turns of soft non-combustible sealing rope or other suitable heat resisting material and wel
43、l tamped in. It is important that the sleeve and the flue pipe do not project inside the chimney flue (see BS 8303-1:1994, Figure 8). This is to avoid the accumulation of fly ash. 8 Flue size The flue sizes for the various categories of appliance are given in Table 1 of BS 8303-1; these are the mini
44、mum sizes that should be used on a universal basis for the successful operation of a solid fuel appliance. In general the size of flue is chosen to ensure adequate evacuation of combustion products. The major operating force providing the flue draught to evacuate the products of combustion is the bu
45、oyancy of the flue gases which is mainly dependent upon the temperature of the flue gas itself but also upon the height of the chimney. An open fire generates a considerably larger volume of flue gas than a closed appliance and therefore needs a bigger capacity flue. In addition the flue gas tempera
46、ture from an open fire is considerably less than a closed appliance and therefore the buoyancy (or flue draught) is also less. Where a chimney is particularly tall, and to prevent excessive draught as may be the case in multi-storey houses, then it may be neccessary to fit a flue draught stabilizer.
47、 It is essential that this device is fitted in the same room or space as the appliance. 9 Separation from combustible material 9.1 Fireplace recess Care should be taken to prevent combustible materials being damaged or ignited when they are subjected to heat from any of the causes described in 5.4 o
48、f BS 8303-1. In the case of a fireplace recess the walls should be of sufficient thickness to prevent the temperature of adjacent combustible material from reaching in excess of 100 C. The thickness will depend on the insulating property of the material of construction. For traditional brick or conc
49、rete block construction the dimensions given in Figure 2 should be adopted. 9.2 Hearth A hearth should be constructed from solid, non-combustible material at least 125 mm thick (this dimension may include the thickness of any solid, non-combustible floor under a hearth but excluding the thickness of any added decorative finish). Its dimensions should be at least those shown in Figure 3 a) for appliances installed into a fireplace recess, or at least those shown in Figure 3 b) for freestanding appliances. Combustible material should not be place
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