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1、BRITISH STANDARD BS 7566-2: 1992 Installation of factory-made chimneys to BS 4543 for domestic appliances Part 2: Specification for installation design Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7566-2:
2、1992 This British Standard, having been prepared under the direction of Technical Committee B 506, was published under the authority of the Standards Board and comes into effect on 15 July 1992 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference B/506/5
3、Draft for comment 89/13383 DC ISBN 0 580 20581 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee B/506, Chimneys, to Subcommittee B/506/5, Chimneys and their components having inner linings of metal, upon which the follow
4、ing bodies were represented: Association of British Solid Fuel Appliances Manufacturers British Coal Corporation British Combustion Equipment Manufacturers Association British Flue and Chimney Manufacturers Association British Gas plc British Precast Concrete Federation Ltd. British Steel Industry B
5、uilding Services Research and Information Association Clay Pipe Development Association Limited Department of the Environment Department of the Environment (Construction Directorate) Health and Safety Executive Institute of Domestic Heating and Environmental Engineers National Association of Plumbin
6、g, Heating and Mechanical Services Contractors National Federation of Master Steeplejacks and Lightning Conductor Engineers National House-building Council The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Department of the Environment (Bui
7、lding Research Establishment) Institute of Vitreous Enamellers Real Fire Association Society of British Gas Industries Vitreous Enamel Development Council Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14
8、:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7566-2:1992 BSI 02-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Exchange of information and structural check1 4Openings into chimney flue1 5Chimney flues1 6Enclosure1 7Chimney route2 Appendix A Mat
9、erials of flue pipes8 Figure 1 Example of cleaning access/debris trap1 Figure 2 Outlets from flues2 Figure 3 Typical straight chimney installation4 Figure 4 Typical chimney installation incorporating bends5 Figure 5 Typical fire-stops and spacers6 Figure 6 Separating flue-pipe from surface of adjace
10、nt combustible materials7 Table 1 Size of flue2 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7566-2:1992 ii BSI 02-1999 Foreword This British Standard has been
11、prepared under the direction of the Technical Committee B/506, Chimneys, and together with Parts 1, 3 and 4 of BS 7566 supersede BS 6461-2:1984, which is withdrawn. This standard covers the installation of factory-made chimneys complying with the requirements of BS 4543. Masonry chimneys are covered
12、 by BS 6461-1:1984. BS 7566 is published in separate Parts in an attempt to highlight the interfaces involved in the successful specification, design and installation of factory-made chimneys. Part 1 of BS 7566 gives a method of specifying the information which should be supplied by the purchaser to
13、 the installation designer. This Part of BS 7566 specifies design instructions to be followed by the installation designer to take account of the purchasers requirements and relevant standards, when developing a chimney design for the particular application. Part 3 of BS 7566 specifies installation
14、practices which are to be followed in order to ensure that the designers intentions are satisfactorily realized and which reflect good site supervision and working practices. Part 4 of BS 7566 gives guidance to the purchaser, designer and installer on the options which have to be identified and the
15、methods of achieving specified requirements in a manner that will ensure a safe and satisfactory installation. It also gives important guidance on matters such as maintenance and cleaning. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Sta
16、ndards 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 8, an inside back cover and a back cover. This
17、 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 14:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
18、 BS 7566-2:1992 BSI 02-19991 1 Scope This Part of BS 7566 gives the design criteria and practice to be followed by the installation designer when designing an installation for a factory-made chimney complying with BS 4543 which, when installed in accordance with BS 7566-3, will successfully convey p
19、roducts of combustion to the outside atmosphere. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS 7566 the definitions in BS 4543-1 apply. 3 Exchange of information and structural check The installa
20、tion designer shall be in possession of and thoroughly conversant with the information given by the purchaser in accordance with BS 7566-1. The installation designer shall check that the building structure is capable of supporting the chimney. NOTEAttention is drawn to the need to comply with all lo
21、cal and general regulations, planning permission, clean air act, fire regulations, etc. 4 Openings into chimney flue Openings in factory-made chimneys for the purpose of inspection or cleaning (see Figure 1) or for fitting a flue draught stabilizer shall be formed by the use of standard sections fro
22、m the chimney manufacturers standard range and shall be accessible after installation (see BS 7566-4). Any opening other than a flue draught stabilizer, shall be fitted with a close fitting, durable, non-combustible cover as supplied by the chimney manufacturer. 5 Chimney flues 5.1 Number of applian
23、ces A chimney flue shall serve only one appliance. 5.2 Chimney flue size 5.2.1 The chimney flue shall be sized in accordance with Table 1 and 5.2.2. 5.2.2 In the case of room heaters, cookers and independent boilers the flue size shall be not less than the cross-sectional area of the flue outlet fro
24、m the appliance. In the case of multi-fuelled appliances the appliance manufacturers recommendations on flue sizes shall be followed. 6 Enclosure Throughout its length, including passage through a cupboard or other storage space or through a roof space, the chimney shall be enclosed by a rigid, non-
25、combustible barrier. This shall be separate from the outside of the chimney by at least the distance recommended in the manufacturers instructions, commonly referred to as the manufacturers specified distance X mm. Figure 1 Example of cleaning access/debris trap Licensed Copy: London South Bank Univ
26、ersity, London South Bank University, Fri Dec 08 14:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7566-2:1992 2 BSI 02-1999 Table 1 Size of flue 7 Chimney route 7.1 General The chimney route shall be the shortest, most direct, vertical distance between the two predetermined points, with the ch
27、imney passing through the roof as near to the ridge as is practicable (see Figure 2). The chimney route shall be determined by the intended position of the installed appliance, its flue outlet and the point of chimney termination at high level. Flue outlets shall terminate outside the shaded area sh
28、own in Figure 2. The chimney route selected shall enable the chimney manufacturers standard components to be used in carrying out the installation. Chimney sections shall not be modified or cut. 7.2 Distance from combustibles The chimney route shall permit any combustible material to be kept at the
29、manufacturers distance X mm (see BS 4543-1) from the external surface of the chimney (see BS 7566-4). The chimney shall not pass through any part of the building forming a separate compartment or pass through any wall/partition, unless it is cased in non-combustible material giving at least half the
30、 fire resistance of the compartment wall or floor. CAUTION. If modification of trusses or rafter involves cutting away timbers, it is imperative to ensure this action does not adversely affect the structure. InstallationMinimum flue size Fireplace recess with an opening up to 500 mm 550 mm 200 mm di
31、ameter or square section of equivalent area Inglenook recess appliances A free area of 15 % of the area of the recess opening Open fire200 mm diameter or square section of equivalent area Closed appliance up to 20 kW rated output burning bituminous coal 150 mm diameter or square section of equivalen
32、t area Closed appliance up to 20 kW rated output 125 mm diameter or square section of equivalent area Closed appliance above 20 kW and up to 30 kW rated output 150 mm diameter or square section of equivalent area Closed appliance above 30 kW and up to 45 kW rated output 175 mm diameter or square sec
33、tion of equivalent area NOTEShould an offset be necessary in a flue run then the flue size should be increased by 25 mm on each dimension (diameter or each side of square flue). NOTE. is the centre line. Figure 2 Outlets from flues Licensed Copy: London South Bank University, London South Bank Unive
34、rsity, Fri Dec 08 14:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7566-2:1992 BSI 02-19993 7.3 Chimney bends The chimney shall have no more than two bends in its length and each shall provide a change of direction not greater than 30 from the vertical. The run of chimney between bends shall n
35、ot exceed 20 % of the total chimney length. 7.4 Exposed sections 7.4.1 Height (see Figure 2) Where the chimney passes through a pitched roof more than 0.6 m from the ridge the horizontal distance between the roof and the chimney termination shall be not less than 2.3 m unless the termination is at l
36、east 0.6 m above the ridge (excluding any chimney terminal). Where the discharge end of the chimney flue is within a horizontal distance of 2.3 m from any adjoining structure or opening into a building the termination height shall be not less than 1 m above that structure or opening. Where the chimn
37、ey passes through a flat roof, or a shallow pitched roof having a slope of less than 10, the chimney termination shall be 1 m above the level of the roof at the point of penetration through the structure. 7.4.2 Stability of exposed sections The roof structure shall provide lateral support for the ch
38、imney, (see BS 6060 and BS 5268-3). When the chimney projects above the last point of lateral restraint it shall be stabilized by further lateral restraints as recommended by the manufacturer by the use of restraints attached to the chimney and anchored to the building structure (see BS 7566-4). 7.4
39、.3 Termination There shall be no termination device that impedes the discharge of flue gases or prevents chimney cleaning (see BS 7566-4). 7.4.4 Lightning protection Where lightning protection on chimney earthing is considered to be desirable (see BS 7566-1), it shall be designed in accordance with
40、BS 6651 (see also BS 7566-4). 7.5 Support 7.5.1 The appliance shall not support the chimney. The chimney shall be supported above the fire place recess by either a raft lintel or a fire place hood, or otherwise by a load bearing plate. Chimney offsets shall be supported and additional intermediate s
41、upports shall be positioned as appropriate (see Figure 3 and Figure 4). 7.5.2 All fixings shall be such that the assembly is non-combustible and durable. 7.6 Joints Joints between chimney sections and associated locking bands shall not occur within any ceiling joist space or wall/partitions. The low
42、er end of the chimney shall extend at least 150 mm below the ceiling. Where the flue pipe connects to the chimney the connection shall be made using a standard connecting piece from the chimney manufacturers range. 7.7 Weatherproofing The opening through which the chimney passes from within the buil
43、ding to the outside shall be weatherproofed. 7.8 Access Access for testing, maintenance and cleaning throughout the full height of the installed chimney shall be possible without dismantling the chimney (see BS 7566-4). 7.9 Fire-stop Fire-stops or fire-stops/spacers shall be fitted to the frame form
44、ed between each building compartment through which the chimney passes (see Figure 3, Figure 4 and Figure 5, also BS 7566-4). 7.10 Chimneys in multi occupancy buildings Where the chimney passes through any part of the building forming a separate compartment, it shall be cased in non-combustible mater
45、ial having a rated fire resistance of at least half the fire resistance of the compartment wall or floor. The enclosure shall be provided with a fire resistant access for maintenance and cleaning purposes, accessible from a public area. 7.11 Flue pipes 7.11.1 General A flue pipe shall be used only t
46、o connect the appliance to the chimney, it shall serve only one appliance and shall not pass through any wall or ceiling. NOTEA list of suitable materials of flue pipes is given in Appendix A. 7.11.2 Flue pipe bends and horizontal flues A flue pipe shall have no more than two bends each providing a
47、maximum change of direction of 45 from the vertical, other than in the case of a back entry application using a 90 tee piece in accordance with the manufacturers instructions. A horizontal flue run shall only be used to connect a back outlet appliance to a chimney or flue pipe and shall be not more
48、than 150 mm in length. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7566-2:1992 4 BSI 02-1999 NOTEAlways refer to manufacturers installation instructions for full details regarding correct installation an
49、d use of support components. Figure 3 Typical straight chimney installation Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7566-2:1992 BSI 02-19995 NOTEAlways refer to manufacturers installation instructions for full details regarding correct installation and use of support components. Figure 4 Typical chimney installation incorporating bends Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:44:38 GMT+0
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