1、BRITISH STANDARD BS3868:1995 Specification for Prefabricated drainage stack units in galvanized steel UDC 696.12-034.14:669.58BS3868:1995 This British Standard, having been prepared under the directionof the Building andCivilEngineering Sector Board,was published under theauthority of the StandardsB
2、oard and comesintoeffect on 15 April1995 BSI 07-1999 First published March 1965 Second edition (in metric) April1973 Third edition April 1995 The following BSI references relate to the work on this standard: Committee reference B/505 Draft for comment93/105168 DC ISBN 0 580 23801 6 Committees respon
3、sible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/505, Wastewater engineering, upon which the following bodies were represented: Association of Consulting Engineers British Plastics Federation Clay Pipe Development Association Limited Con
4、crete Pipe Association Department of the Environment Department of the Environment (Property and Building Directorate) Fibre Cement Manufacturers Association Limited Institute of British Foundrymen Institution of Civil Engineers Institution of Water and Environmental Management Local Authority Organ
5、izations METCOM Water Services Association of England and Wales The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of Building Component Manufacturers Brewers Society British Bathroom Council British Plumbing Fittings Manufacture
6、rs Association British Pump Manufacturers Association Consumer Policy Committee of BSI Department of the Environment (Building Research Establishment) Institute of Building Control Institute of Clerks of Works of Great Britain Inc. Institute of Plumbing National Association of Plumbing, Heating and
7、Mechanical Services Contractors Scottish Office (Building Directorate) Amendments issued since publication Amd. No. Date CommentsBS3868:1995 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword iii 1 Scope 1 2 References 1 3 Definitions 1 4 Materials 1 5 Dimensions and weig
8、hts 1 6 Fabrication 1 7 Jointing 1 8 Galvanizing 2 9 Dimensions of components 2 10 Tolerances in completed units 2 11 Inspection 2 12 Suppliers certificate 2 13 Marking 2 14 Assembly of units 2 Figure 1 Pipe 3 Figure 2 Push fit joint 3 Figure 3 Mechanical joint 4 Figure 4 Weathering apron 4 Figure 5
9、 Short radius bends 4 Figure 6 Offset joints 5 Figure 7 Access door 5 Figure 8 Standard branch connection 6 Figure 9 Stub branch with collar connection 6 Figure 10 45 swept branch connection 7 Figure 11 Stub swept branch connection 7 Figure 12 Waste boss (BSP type) connection 8 Figure 13 Waste boss
10、(insert type) connection 9 Figure 14 Cleaning eyes 9 Figure 15 Munsen bracket 10 Figure 16 Waste standpipe 10 Figure 17 Saddle connections 11 Figure 18 Example of a drainage stack system 12 Figure 19 Example of a WC system off the stack 13 Figure 20 Example of a WC manifold 14 Table 1 Dimensions and
11、 weights of pipe 3 Table 2 Galvanized to galvanized push fit joint 3 Table 3 Galvanized to PVC-u push fit joint 3 Table 4 Galvanized to galvanized mechanical joint 4 Table 5 Dimensions for weathering apron 4 Table 6 Dimensional examples of short radius bends 4 Table 7 Dimensional examples of offset
12、joints 5 Table 8 Dimensions of access door 5 Table 9 Variations of standard branch connection 6 Table 10 Variations of stub branch with collar connection 6 Table 11 Variations of 45 swept branch connection 7 Table 12 Variations of stub swept branch connection 7BS3868:1995 ii BSI 07-1999 Page Table 1
13、3 Dimensions of waste boss (BSP type) connection 8 Table 14 Dimensions of waste boss (insert type) connection 9 Table 15 Dimensions of cleaning eyes 9 Table 16 Dimensions of munsen brackets 10 Table 17 Dimensions of waste standpipe 10 Table 18 Dimensions of saddle connections 11 List of references I
14、nside back coverBS3868:1995 BSI 07-1999 iii Foreword This British Standard has been prepared under the direction of Technical Committee B/505, Wastewater engineering. It is a revision, taking into account current practice for sanitary pipework. On publication of this standard, BS3868:1973 will be wi
15、thdrawn. 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. Summary of pages This document c
16、omprises a front cover, an inside front cover, pagesi toiv, pages1 to14, 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.iv blankBS3868:1995 BS
17、I 07-1999 1 1 Scope This British Standard specifies requirements for prefabricated drainage stack units, manufactured from steel and galvanized after fabrication. These units are for use above ground, in plumbing systems for wastewater and rainwater; to include pipework within or external to a build
18、ing, including basements, but excluding pipework which enters the ground. 2 References 2.1 Normative references This British Standard incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and th
19、e publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this British Standard only when incorporated in it by updating or revision. 2.2 Informative references This British Standard refers to other publications that provide inf
20、ormation 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. 3 Definitions For the purposes of this British Standard, the definitions given in BS6100-1.3.2, BS6100-1.3.6, B
21、S6100-1.5.1, and BS6100-2.7 and BS6100-3.3 apply. 4 Materials Pipes and components used in prefabricated systems shall be manufactured from light or medium black steel tubes conforming to BS1387. Fittings intended for use with prefabricated systems shall be manufactured from mild steel of an equal q
22、uality and thickness as the steel pipes to which they are connected. All fabricated components shall be finished free from burrs and sharp edges. 5 Dimensions and weights Steel tubes and other components of the system shall conform to the dimensions and weights given in Table 1 to Table 18. NOTEDime
23、nsions are illustrated in Figure 1 to Figure 20. 6 Fabrication All branch junctions shall have a weld free crotch radius (see Table 9 to Table 12). Welding shall be carried out in accordance with BS2971. The completed assembly shall be cleaned of all weld slag. The unit shall be airtight and capable
24、 of passing an air test at a pressure equivalent to1.5kN/m, over a period of3min. Bends shall be supplied and fabricated to angle A of Figure 5 within 1 . Access doors shall comprise a galvanized steel cover plate and sealing gasket fixed to a welded backplate using non-ferrous setpins. Cleaning eye
25、s shall be formed by welding on a parallel threaded British Standard Pipe thread (BSP) female iron boss to either an extruded hole or pipe end. Munsen brackets shall be fabricated from mild steel and galvanized or red oxide painted after manufacture. Saddle connections shall be fabricated from mild
26、steel and galvanized after manufacture. 7 Jointing Units shall be joined together to form a complete stack, using one or more of the following connections. a) Push fit joint. Push fit synthetic rubber gasket used with spigot and socket pipes, for galvanized to galvanized, or galvanized to PVC-u. b)
27、Mechanical joint. Bolted joint compressing a synthetic rubber gasket using spigot pipes, for use with galvanized to galvanized; galvanized to cast iron or PVC-u. NOTE 1The galvanized to galvanized joint contains a bond that, when fitted correctly, ensures electrical continuity. c) Push fit waste bos
28、s. Push fit insert waste boss with synthetic rubber gasket for use with copper or PVC-u pipes. d) Screwed waste boss. Screwed BSP waste boss for use with galvanized, copper, or PVC-u pipes. NOTE 2An insulating connector is required with copper pipes. e) Saddle connection. Bolt on saddle connections,
29、 for upgrading existing systems. f) Flanged joints. Flanged joints shall be in accordance with BS4504. g) Caulked joints. Socket and spigot pipes which may be caulked with yarn and blue lead. h) Weathering apron. An inverted collar is welded on to pipe allowing approximately20mm gap for flashing in
30、a lead, slate or asphalt roof finish.BS3868:1995 2 BSI 07-1999 Mechanical joints shall provide continuity of metal to metal contact in accordance with BS7671 to ensure electrical earthing. 8 Galvanizing After fabrication the assemblies shall be galvanized internally and externally so that the coatin
31、g meets the requirements of BS729. NOTEIf pipes are cut on site the ends should be painted immediately with zinc rich paint. 9 Dimensions of components The dimensions of components shall conform to the relevant tables in this standard. 10 Tolerances in completed units Dimensions of completed units s
32、hall have a permissible deviation of 1.5mm. Angles to branches and bends shall have a permissible deviation of 1 . 11 Inspection The purchaser or his representative shall have access, by appointment, to those parts of the manufacturers works in which the production of assemblies is being carried out
33、. He shall be at liberty to inspect the manufacture of assemblies at any stage and to reject any material which does not conform to the requirements of this standard. 12 Suppliers certificate The manufacturer shall supply a certificate, on request, stating that the prefabricated assemblies are manuf
34、actured in accordance with the requirements of this British Standard. 13 Marking Each component or unit shall have a distinguishing mark of the manufacturer, a job number and date of manufacture. NOTEMarking may be by stencilling or on an attached metal label. 14 Assembly of units Prefabricated unit
35、s specifically assembled for the drainage of wastewater from buildings shall conform to BS5572. BS3868:1995 BSI 07-1999 3 Table 1 Dimensions and weights of pipe Table 2 Galvanized to galvanized push fit joint Table 3 Galvanized to PVC-u push fit joint Figure 1 Pipe Nominal size (mm) 32 40 50 80 100
36、125 150 Class (BS 1387) Light Light Light Light Light Medium Medium Mean outside diameter (mm) 45.5 48.4 60.3 88.9 114.2 139.7 165.1 Wall thickness swg (mm) 12g 2.6 11g 2.9 11g 2.9 10g 3.2 9g 3.7 6g 4.9 6g 4.9 Mean inside diameter (mm) 37.3 42.6 54.5 82.5 106.5 129.9 155.3 Area of bore (mm 2 ) 1090
37、1425 2330 5345 10960 13255 18945 Average weight (galvanized) (kg/m) 2.81 3.6 4.5 7.6 11.0 17.9 21.0 Figure 2 Push fit joint Dimensions in millimetres Nominal size D 50 80 100 150 Collar diameter W 89 115 140 192 Collar length L 60 80 80 95 Dimensions in millimetres Nominal size D 50 80 100 Collar di
38、ameter W 89 115 140 Collar length L 60 80 80 NOTEA push fit gasket should be made from synthetic rubber conforming to BS2494.BS3868:1995 4 BSI 07-1999 Table 4 Galvanized to galvanized mechanical joint Table 5 Dimensions for weathering apron Table 6 Dimensional examples of short radius bends Figure 3
39、 Mechanical joint Dimensions in millimetres Nominal size D 50 80 100 125 150 A/C flanges W 120 150 180 210 235 NOTEA mechanical joint gasket should be made from synthetic rubber conforming to BS2494. Figure 4 Weathering apron Dimensions in millimetres Nominal size D 50 80 100 125 150 Apron size (i/d
40、) W 106 129 155 181 207 Apron length L 60 65 65 75 75 Figure 5 Short radius bends Linear dimensions in millimetres Nominal size D 32 40 50 80 100 125 150 Radius R 48 57 76 114 152 190 228 A = 165 length S 6 8 10 15 20 25 30 150 13 15 20 30 41 51 61 135 19 24 32 48 64 80 95 120 28 33 44 66 88 110 132
41、 105 27 44 58 88 117 147 165 95 43 52 70 105 135 175 210 90 48 57 76 114 152 190 228 NOTEShort radius bends are a radius to the centre line of one and a half times the nominal size, i.e.100mm diameter =152clr (centre line radius).BS3868:1995 BSI 07-1999 5 Table 7 Dimensional examples of offset joint
42、s Table 8 Dimensions of access door Figure 6 Offset joints Linear dimensions in millimetres Nominal size D 50 80 100 125 150 Radius R 76 114 152 190 228 A = 165 gives projection P 5(40) 8(60) 10(80) 13(100) 15(220) 150 length L 20 (77) 30(115) 40(154) 50(192) 60(230) 135 44(80) 66(161) 88(125) 110(2
43、68) 132(322) 120 76(132) 114(198) 152(265) 190(330) 228(396) 105 112(147) 169(221) 225(295) 200(369) 337(442) 95 140(152) 210(228) 270(295) 350(380) 420(457) 90 152(152) 228(228) 305(305) 380(380) 456(456) NOTEOffset may be formed from short radius bends. Figure 7 Access door Dimensions in millimetr
44、es Nominal pipe 80 100 125 150 Panel size H W 140 110 185 160 Aperture H W 100 80 125 100 Projection F 75 90 105 120BS3868:1995 6 BSI 07-1999 Table 9 Variations of standard branch connection Table 10 Variations of stub branch with collar connection Figure 8 Standard branch connection Linear dimensio
45、ns in millimetres Angle of entry From 0 up to 45 in 0.5 intervals Branch options D B 32 32 40 32 50 32 80 32 100 32 125 35 150 32 40 40 50 40 80 40 100 40 125 40 150 40 50 50 80 50 100 50 125 50 150 50 80 80 100 80 125 80 150 80 100 100 125 100 150 100 125 125 150 125 150 150 NOTEA standard branch m
46、ay be formed via an extruded hole with weld free crotch radius without intrusion into the bore of the main pipe. Figure 9 Stub branch with collar connection Linear dimensions in millimetres Angle of branch Up to45 in0.5 intervals Branch options D B 50 50 80 50 100 150 125 50 150 50 80 80 100 80 125
47、80 150 80 100 100 125 100 150 100 NOTEStub branch projection F may be nominally equivalent to pipe diameter D but may also be extended as required.BS3868:1995 BSI 07-1999 7 Table 11 Variations of45 swept branch connection Table 12 Variations of stub swept branch connection Figure 10 45 swept branch
48、connection Linear dimensions in millimetres Angle of branch Normally90 Branch options D B 50 50 80 50 100 50 125 50 150 50 80 80 100 80 125 80 150 80 100 100 125 125 150 150 150 150 NOTESwept branch projection F may be nominally equivalent to pipe diameter D 3 for junctions of equal diameter but may
49、 be adjusted for smaller branch options. Angle of entry branch to main pipe is45 . Figure 11 Stub swept branch connection Linear dimensions in millimetres Angle of branch From 0 up to approximately15 Branch options D B 50 50 80 50 100 50 125 50 150 50 80 80 100 80 125 80 150 80 100 100 125 100 150 100 125 125 150 125 150 150 NO
