1、BRITISH STANDARD BS3445-2: 1992 Agricultural water troughs and water fittings Part 2: Code of practice for installation and operationBS3445-2:1992 This British Standard, having been prepared under the direction of the Farm and Horticultural Buildings StandardsPolicy Committee, waspublished under the
2、 authorityof the Standards Boardand comes into effect on 31 January1992 BSI06-1999 First published as BS3445 December1961 Second edition July1981 Third edition January1992 The following BSI references relate to the work on this standard: Committee referenceFHB/6 Draft for comment91/12078 DC ISBN 0 5
3、80 20241 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Farm and Horticultural Buildings Standards Policy Committee (FHB/-) to Technical Committee FHB/6, upon which the following bodies were represented: British Agricultural and Garde
4、n Machinery Association Ltd. British Precast Concrete Federation Ltd. Glassfibre Reinforced Cement Association Ministry of Agriculture, Fisheries and Food National Farmers Union Plastic Tanks and Cisterns Manufacturers Association STC Water Regulations and Fittings Scheme Scottish Office (Agricultur
5、e and Fisheries Department) Water Services Association of England and Wales Amendments issued since publication Amd. No. Date CommentsBS3445-2:1992 BSI 06-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Installation 1 4 Operation and maintenance
6、 3 Appendix A Information to be supplied by the purchaser 4 Figure 1 Typical trough installation 2 Table 1 Type “A” air gap 1 Index 5 Publication(s) referred to Inside back coverBS3445-2:1992 ii BSI 06-1999 Foreword This Part of BS3445, together with Part1 is a revision of BS3445:1981 and has been p
7、repared under the direction of the Farm and Horticultural Building Standards Policy Committee. Together these Parts supersede BS3445:1981 which is withdrawn. The main function of this British Standard is to protect the water supply against contamination, and this Part gives recommendations for the i
8、nstaller and operator on meeting water byelaw requirements. It is recognized that manufacturers of troughs are rarely involved in the manufacture or supply of water fittings or in their installation. This standard is therefore written in two Parts in order that the Parts can be specified separately
9、or together as required. The recommendations given in this Part, however, assume that the quality of water trough bodies, service boxes and of the water supply system meet the requirements specified in BS3445-1. A British Standard does not purport to include all the necessary provisions of a contrac
10、t. 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 front cover, pagesi andii, pages1 to6, an inside back cover and
11、 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.BS3445-2:1992 BSI 06-1999 1 1 Scope This Part of BS3445 gives recommendations for the siting, installation and operatio
12、n of water trough bodies, service boxes and water supply systems used for drinking water for livestock. Recommendations are also given in meeting water byelaw requirements or regulations where appropriate. NOTEThe titles of the publications referred to in this standard are listed on the inside back
13、cover. 2 Definitions For the purposes of this Part of BS3445 the definitions given in BS3445-1 and BS6100 apply. 3 Installation 3.1 General 3.1.1 The completed installation should comply with the relevant water byelaws or regulations applicable to the area. The recommended dimensions for a type “A”
14、air gap are given in Table 1 and a typical trough installation is shown inFigure 1. 3.1.2 Where possible a free draining site should be chosen for the installation. 3.1.3 The water trough and the associated pipes and fittings should be as specified in BS3445-1. 3.1.4 The trough should be sited away
15、from tall hedges or trees where leaves and flies may contaminate the water or irritate livestock. 3.1.5 A concrete or hardcore standing should be laid not less than2m wide around the trough to prevent poaching. Table 1 Type “A” air gap 3.1.6 Wooden or metal cradles, cleats, water pipes, stop valves,
16、 surface boxes, pipe guarding, thermal insulation and other ancillaries should comply with relevant British Standards, or in the absence of a British Standard should be of a quality and durability comparable with the trough. 3.2 Trough support 3.2.1 Troughs should be supported by one of the followin
17、g and installed with the top edges of the drinking compartment horizontal: a) wooden or metal cradles; b) brick or concrete walls or cradles; c) concrete or brick base; d) a compacted bed of hardcore, chalk or shingle, blinded to give a level surface. 3.2.2 The support should be such that the trough
18、 is firmly anchored, both when empty and when full, so that it cannot be disturbed by animals. The fixture should be independent of the attachment of the trough to the water pipe. 3.2.3 The choice of mounting should take into account future use of the ground. 3.2.4 If the trough is of galvanized ste
19、el, it should be placed on supports to raise the bottom of the trough clear of the ground in order to minimize corrosion. 3.3 Water supply pipe, stop valve/cock, surface box, pipe guarding and thermal insulation 3.3.1 The water supply pipe should be laid underground, with a depth of cover not less t
20、han750mm. 3.3.2 A stop valve complying with BS5433 or an underground plug cock to BS2580 should be provided in the water supply pipe near the trough to control the water supply to the float operated valve. 3.3.3 The stop valve/cock should be placed underground, at a depth of not less than750mm and s
21、hould be placed in a position where it cannot be damaged by animals. 3.3.4 The stop valve/cock should be accommodated in an underground chamber of not less than225mm internal diameter, providing sufficient space to permit operation of the crutch-head by hand. 3.3.5 The stop valve/cock chamber should
22、 be provided with a lid or surface box, incorporating a retaining device to prevent opening or disturbance by livestock or farm vehicles. Nominal size of supply pipe (d) Minimum value of (S) Up to and including14mm 15mm and up to21mm 22mm and up to41mm 42mm and over mm 20 25 70 2dBS 3445-2:1992 2 BS
23、I 06-1999 NOTEAll parts to be protected against damage by livestock. Figure 1 Typical trough installationBS3445-2:1992 BSI 06-1999 3 3.3.6 The whole of the water supply pipe, from the point where it connects with the float operated valve to the point at which it reaches a depth of750mm below ground,
24、 should be lagged in accordance with BS6700 as a protection against frost damage. The portion of the lagging which is above ground should be covered externally to protect it from moisture and should be accommodated in a pipe guard or other suitable enclosure. The portion of the lagging which is belo
25、w ground should be protected against underground moisture. It is recommended that this be achieved by sleeving the water supply pipe and lagging in heavy duty hose or other flexible pipe, and sealing the annular space between the water supply pipe and the sleeve at each end by means of a bush and a
26、worm-drive hose clip, suitably protected from corrosion. 3.3.7 To minimize the risk of frost damage, it is recommended that the water supply pipe between the underground stop valve/cock, and the float operated valve should be of polyethylene in accordance with BS6572. 3.3.8 The float operated valve
27、should be rigidly attached to the service box or trough and should be adjusted so that the highest level the water in the drinking compartment can reach is not less than25mm below its top edge. 3.3.9 If a trough is installed such that the supply pipe is not protected by a wall or other structure, a
28、pipe guard should be fitted which encloses the supply pipe and lagging from all sides and from above. This is to provide protection against damage by livestock. The pipe guard should be securely attached to the trough or service box. 4 Operation and maintenance 4.1 In the interests of good animal hu
29、sbandry troughs should be kept clean and clear of rubbish. 4.2 Drain holes and plugs should be located at the bottom of an end plate rather than underneath the trough. NOTEDrain holes and plugs can usually be supplied to order by the manufacturer. Galvanized steel troughs may be drilled on site to t
30、ake such a fitting but care should be taken to remove any swarf after drilling, as this is dangerous to animals and a cause of corrosion to the trough. Alternatively, siphons or pumps may be used for draining troughs.BS3445-2:1992 4 BSI 06-1999 Appendix A Information to be supplied by the purchaser
31、The following information should be made available by the purchaser: a) type of trough, i.e.concrete, steel, GRC or polyethylene; b) shape and capacity; c) whether any of the following are required to be fitted or supplied as extras: 1) drain holes, plugs and chains; 2) cleats; 3) pipe guarding; 4)
32、insulation; 5) piping; 6) float operated valve; 7) stop valve; 8) surface box; 9) cradle; 10) any other fittings, e.g.sleeves, nut, bolts, etc. d) any special site features.BS3445-2:1992 BSI 06-1999 5 Index installation, 3 general,3.1 ofatypicaltrough,Figure 1 maintenance, 4 operation, 4 pipe guardi
33、ng,3.3 stop valve/cock,3.3 surface box,3.3 thermal insulation,3.3 trough support,3.2 water supply pipe,3.36 blankBS3445-2:1992 BSI 06-1999 Publication(s) referred to BS2580, Specification for underground plug cocks for cold water services. BS3445, Agricultural water troughs and water fittings. BS344
34、5-1, Specification for water trough bodies, service boxes and water supply system. BS5433, Specification for underground stopvalves for water services. BS6100, Glossary of building and civil engineering terms. BS6572, Specification for blue polyethylene pipes up to nominal size63 for below ground us
35、e for potable water. BS6700, Specification for design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages. BS3445-2: 1992 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body
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