BS-7435-1-1991.pdf
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1、BRITISH STANDARD BS 7435-1: 1991 Fibre cement flue pipes, fittings and terminals Part 1: Specification for light quality fibre cement flue pipes, fittings and terminals Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:43:20 GMT+00:00 2006, Uncontrolled Copy, (
2、c) BSI BS 7435-1:1991 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 01-2000 The following BSI references relate to
3、the work on this standard: Committee reference FRB/3 Draft for comment 88/13656 DC ISBN 0 580 19563 5 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 14:43:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7435-1:1991 BSI 01-2000i 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 and fittings4 Appendix B Test for transverse crushing strength8 Appendix C Test for flow resistance of terminals8 Appendix D Test for acid resistance11 Figure 1 Typical freestanding terminals and ridge terminal adapto
7、r2 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 Slip socket7 Figure 8 Loose socket for connecting fibre cement pipes of the same nominal size7 Figure 9 Blank cap7 Figure 10 Split socket with
8、connecting strap8 Figure 11 Loading in transverse crushing test9 Figure 12 Apparatus for measuring flow resistance of freestanding terminals under wind conditions10 Figure 13 Apparatus for measuring flow resistance of ridge terminals under wind conditions11 Table 1 Tolerances4 Table 2 Straight pipes
9、4 Table 3 Square and obtuse bends5 Table 4 Equal square and obtuse tees5 Table 5 Unequal square and obtuse tees6 Table 6 Taper pieces6 Table 7 Slip sockets7 Table 8 Loose sockets for connecting fibre cement pipes of the same nominal size7 Table 9 Blank caps7 Table 10 Split sockets with metal connect
10、ing strap7 Table 11 Flue flow rates and values of the constant X9 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:43:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7435-1:1991 ii BSI 01-2000 Foreword This Part of
11、BS 7435, which has been prepared under the direction of the Fibre Reinforced Cement Products Standards Policy Committee, contains dimensional and performance requirements for light quality fibre cement flue pipes, fittings and terminals. BS 7435-1 contains requirements for heavy quality fibre cement
12、 flue pipes, fittings and freestanding terminals. Tests for transverse crushing strength, flow resistance of terminals and acid resistance are given in Appendix B, Appendix C and Appendix D. The standard relates to products composed of cement based compounds including particulate fillers, reinforced
13、 with selected fibres excluding asbestos, and includes methods of test for transverse crushing strength, flow resistance of terminals and acid resistance. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their c
14、orrect 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 12, an inside back cover and a back cover. This standard has been updated (see c
15、opyright 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 14:43:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7435-1:1991 BSI 01-20001 1 Sc
16、ope This Part of BS 7435 specifies dimensional, performance and test requirements for light quality fibre cement (excluding fibres of asbestos) flue pipes, fittings and terminals of nominal sizes 75 mm, 100 mm, 125 mm and 150 mm. This quality of pipe, which is unsuitable for use where there is direc
17、t flame impingement, is intended for use with the following. a) Oil burning appliances with a rated output up to 44 kW (for space heating and hot water supply purposes) and a flue gas temperature not exceeding 260 C. NOTE 1For further information reference should be made to BS 5410-1. b) Gas burning
18、 appliances with a rated input up to 60 kW. NOTE 2For further information reference should be made to BS 5440-1. c) Ventilation ducts and other purposes. NOTE 3For nominal sizes exceeding 150 mm for use with gas burning appliances and for fibre cement (excluding fibres of asbestos) flue pipes, fitti
19、ngs and freestanding terminals for use with oil burning equipment (for industrial installations) with a waste gas temperature not exceeding 230 C, and incinerators (not exceeding 0.03 m3 in capacity) see BS 7435-2. NOTE 4The titles of the publications referred to in this standard are listed on the i
20、nside back cover. 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 sy
21、stem 2.2 ridge terminal terminal designed for fitting at the ridge of a building 2.3 ridge terminal adaptor (“R”-type adaptor) fitting for connecting circular cross section pipe to the rectangular section connection of a ridge terminal 3 Composition and materials 3.1 Composition Fibre cement (exclud
22、ing fibres of asbestos) flue pipes, fittings and terminals shall be made from a close and homogeneous mixture consisting of a suitable inorganic hydraulic binder, fibre, fillers and water; they shall exclude any materials liable to cause deterioration in the quality of the pipes, fittings and termin
23、als, which shall be left in their natural colour. NOTE 1Cement complying with BS 12 is a suitable binder. NOTE 2Pipes, fittings and terminals 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 an
24、d other components that do not come into direct contact with flue gases (e.g. the galvanized steel strap shown in Figure 10), metal parts that are to be incorporated in a terminal or fitting shall be manufactured from highly corrosion resistant stainless steel complying with grade 316S11, 316S13, 31
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