BS-7435-2-1991.pdf
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1、BRITISH STANDARD BS 7435-2: 1991 Fibre cement flue pipes, fittings and terminals Part 2: Specification for heavy quality fibre cement flue pipes, fittings and terminals Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:43:41 GMT+00:00 2006, Uncontrolled Copy, (
2、c) BSI BS 7435-2:1991 This British Standard, having been prepared under the direction of the Fibre Reinforced Cement Products Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 31 July 1991 BSI 02-2000 The following BSI references relate to
3、the work on this standard: Committee reference FRB/3 Draft for comment 88/13657 DC ISBN 0 580 19564 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Fibre Reinforced Cement Products Standards Policy Committee (FRB/-) to Technical Commit
4、tee FRB/3, upon which the following bodies were represented: British Gas plc Fibre Cement Manufacturers Association Limited Glassfibre Reinforced Cement Association Institution of Water and Environmental Management Amendments issued since publication Amd. No.DateComments Licensed Copy: London South
5、Bank University, London South Bank University, Fri Dec 08 14:43:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7435-2:1991 BSI 02-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Composition and materials1 4Fire properties1 5Manufacture1 6Sizes and tol
6、erances2 7Performance criteria2 8Marking3 9Instructions3 Appendix A Sizes of pipes, fittings and freestanding terminals (cone caps)4 Appendix B Test for transverse crushing strength10 Appendix C Test for flow resistance of freestanding terminals11 Appendix D Test for acid resistance11 Figure 1 Typic
7、al freestanding terminals2 Figure 2 Straight pipe4 Figure 3 Square/obtuse bend5 Figure 4 Equal square/obtuse tee5 Figure 5 Unequal square/obtuse tee6 Figure 6 Taper piece6 Figure 7 Socket for connecting fibre cement pipe to metal pipe of the same nominal size8 Figure 8 Loose socket for connecting fi
8、bre cement pipes of the same nominal size8 Figure 9 Cone cap9 Figure 10 Blank cap9 Figure 11 Cleaning door9 Figure 12 Loading in transverse crushing test10 Figure 13 Apparatus for measuring flow resistance of freestanding terminals under wind conditions12 Table 1 Tolerances3 Table 2 Straight pipes4
9、Table 3 Square and obtuse bends5 Table 4 Equal square and obtuse tees5 Table 5 Unequal square and obtuse tees6 Table 6 Taper pieces7 Table 7 Sockets for connecting fibre cement pipes to metal pipes of the same nominal size8 Table 8 Loose sockets for connecting fibre cement pipes of the same nominal
10、size8 Table 9 Cone caps9 Table 10 Blank caps9 Table 11 Cleaning doors9 Table 12 Width of upper press-block10 Table 13 Flue flow rates and values of the constant X11 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:43
11、:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7435-2:1991 ii BSI 02-2000 Foreword This Part of BS 7435, which has been prepared under the direction of the Fibre Reinforced Cement Products Standards Policy Committee, contains dimensional, performance and test requirements for heavy quality fibre
12、cement flue pipes, fittings and freestanding terminals. BS 7435-1 contains requirements for light quality fibre cement flue pipes, fittings and terminals. Tests for transverse crushing strength, flow resistance of terminals and acid resistance are given in Appendix B, Appendix C and Appendix D. The
13、standard relates to products composed of cement based compounds including particulate fillers, reinforced with selected fibres excluding asbestos, and includes methods of test for transverse crushing strength, flow resistance of freestanding terminals and acid resistance. A British Standard does not
14、 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 front cover, an inside fr
15、ont cover, pages i and ii, pages 1 to 12, 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. Licensed Copy: London South Bank University, London
16、South Bank University, Fri Dec 08 14:43:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7435-2:1991 BSI 02-20001 1 Scope This Part of BS 7435 specifies dimensional, performance and test requirements for heavy quality fibre cement (excluding fibres of asbestos) flue pipes, fittings and freestanding
17、terminals of nominal sizes from 100 mm to 600 mm inclusive. This quality of pipe, which is unsuitable for use where there is direct flame impingement, is intended for use with the following. a) Oil burning equipment (for industrial installations such as furnaces, kilns and ovens) with a waste gas te
18、mperature not exceeding 230 C. NOTE 1For further information reference should be made to BS 5410-3. b) Gas burning appliances. NOTE 2For further information reference should be made to BS 5440-1, BS 6230 or BS 6644, as appropriate. c) Incinerators having a refuse combustion chamber capacity not exce
19、eding 0.03 m3. NOTE 3For further information on incinerators using gas as a means of igniting refuse, reference should be made to BS 5440-1. d) Ventilation ducts and other purposes. NOTE 4For fibre cement (excluding fibres of asbestos) flue pipes, fittings and terminals of nominal sizes of 150 mm an
20、d under, for use with oil burning appliances with a rated output up to 44 kW and a flue gas temperature not exceeding 260 C and gas burning appliances with a rated input up to 60 kW, see BS 7435-1. NOTE 5The titles of the publications referred to in this standard are listed on the inside back cover.
21、 2 Definitions For the purposes of this Part of BS 7435, the definitions given in BS 6100-2.8, BS 1179:19671) and BS 1179-61) apply, together with the following. 2.1 freestanding terminal terminal, other than a ridge terminal, designed for fitting directly to the outlet of a flue system 2.2 ridge te
22、rminal terminal designed for fitting at the ridge of a building 3 Composition and materials 3.1 Composition Fibre cement (excluding fibres of asbestos) flue pipes, fittings and freestanding terminals shall be made from a close and homogeneous mixture consisting of a suitable inorganic hydraulic bind
23、er, fibre, fillers and water; they shall exclude any materials liable to cause deterioration in the quality of the pipes, fittings and freestanding terminals, which shall be left in their natural colour. NOTE 1Cement complying with BS 12 is a suitable binder. NOTE 2Pipes, fittings and freestanding t
24、erminals can also be supplied with adherent sealant on their surfaces. Sealant is only applied for purposes of dust suppression. 3.2 Materials Except for fastenings and other components that do not come into direct contact with flue gases, metal parts that are to be incorporated in a terminal or fit
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