1、BRITISH STANDARD BS 417-2:1987 Specification for Galvanized low carbon steel cisterns, cistern lids, tanks and cylinders Part 2: Metric units UDC 621.642.34 + 696.113 034.14BS 417-2:1987 This British Standard, having been prepared under the directionof the Building ServicesStandards Committee, was p
2、ublished under the authorityof the Board of BSI andcomes intoeffect on 30 September 1987 BSI 08-1999 First published as BS 417 October 1931 First revision September 1936 Second revision (War Emergency) 1940 Third revision December 1944 Fourth revision August 1951 Fifth revision January 1964 Sixth re
3、vision BS 417-2 October 1973 Seventh revision September 1987 The following BSI references relate to the work on this standard: Committee reference SEB/9 Draft for comment 86/11843 DC ISBN 0 580 15895 0 Committees responsible for this British Standard The preparation of this British Standard was entr
4、usted by the Building Services Standards Committee (SEB/-) to Technical Committee SEB/9, upon which the following bodies were represented: Association of Manufacturers of Domestic Electrical Appliances Association of Manufacturers of Domestic Unvented Supply Systems Equipment (MODUSSE) British Combu
5、stion Equipment Manufacturers Association British Copper Cylinder Association British Gas plc British Non-ferrous Metals Federation Chartered Institute of Building Copper Development Association Copper Tube Fittings Manufacturers Association Department of the Environment (Building Research Establish
6、ment) Department of the Environment (Department of Transport, Common Services) Department of the Environment (Property Services Agency) Electricity Supply Industry in England and Wales Galvanizers Association Heating and Ventilating Contractors Association Institute of Plumbing Royal Institute of Pu
7、blic Health and Hygiene Solid Fuel Advisory Service Water Authorities Association Water Companies Association Waterheater Manufacturers Association Zinc Development Association Amendments issued since publication Amd. No. Date of issue CommentsBS 417-2:1987 BSI 08-1999 i Contents Page Committees res
8、ponsible Inside front cover Foreword iii Section 1. General 1 Scope 1 2 Definitions 1 3 Effect of non-metallic materials on water quality 1 Section 2. Cisterns and lids 4 Designation 2 5 Dimensions 2 6 Tolerances on dimensions 2 7 Materials 4 8 Manufacture 4 9 Staying of cisterns 5 10 Additional fea
9、tures 7 11 Testing 7 12 Marking 7 Section 3. Tanks 13 Designation 8 14 Dimensions 8 15 Tolerances on dimensions 9 16 Materials 9 17 Manufacture 9 18 Additional features 9 19 Testing 9 20 Marking 9 Section 4. Cylinders 21 Designation 10 22 Dimensions 10 23 Tolerances on dimensions 10 24 Materials 10
10、25 Manufacture 10 26 Design of cylinder top and bottom 10 27 Screwed connections for pipes 13 28 Additional features 14 29 Testing 14 30 Marking 14 Appendix A Information to be supplied by the purchaser 15BS 417-2:1987 ii BSI 08-1999 Page Figure 1 Method of measuring cisterns 2 Figure 2 Method of me
11、asuring and constructing lids 3 Figure 3 Methods of staying cisterns 6 Figure 4 Method of measuring tanks 8 Figure 5 Method of measuring cylinders 10 Figure 6 Cylinder top and bottom details 12 Figure 7 Positions of screwed connections on cylinders 13 Table 1 Dimensions of cisterns and lids 4 Table
12、2 Staying of cisterns 5 Table 3 Dimensions of tanks 8 Table 4 Dimensions of cylinders 11 Table 5 Maximum height of cylinder top 13 Publications referred to Inside back coverBS 417-2:1987 BSI 08-1999 iii Foreword This Part of BS417 has been prepared under the direction of the Building Services Standa
13、rds Committee and is a revision of BS417-2:1973 which is withdrawn. This revision became necessary in order to take account of the requirements of the New Model Water Byelaws1986 and reflect the actions taken in the revision of other standards in this series. Seven standards, covering water storage
14、vessels mainly for domestic use, now form a series to which others may be added when such a course is considered necessary. The six other standards in this series are BS699, BS1565, BS1566, BS2777, BS3198 and BS4213. A British Standard does not purport to include all the necessary provisions of a co
15、ntract. 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 to iv, pages1 to16, an inside back cov
16、er 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 blankBS 417-2:1987 BSI 08-1999 1 Section 1. General 1 Scope This Part of BS 417 specifies requirements for gal
17、vanized cisterns (in two grades, A and B), cistern lids, tanks (in two grades, A and B) and cylinders (in three grades, A, B and C). The standard capacities are from18L to3 364L in the cistern range, from95L to155L in the tank range and from73L to441L in the cylinder range. The cylinders are intende
18、d for fixing in the vertical position. NOTE 1The information to be supplied by the purchaser at the time of enquiry or order is given inAppendix A. NOTE 2The 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
19、417, the following definitions apply. 2.1 cistern an open top rectangular vessel 2.2 tank a closed rectangular vessel 2.3 cylinder a closed cylindrical vessel with domed ends 2.4 water line the highest water level at which a cistern is designed to work 2.5 capacity (of a cistern) the capacity of a c
20、istern when filled to the water line 3 Effect of non-metallic materials on water quality When used under the conditions for which they are designed, non-metallic materials in contact with or likely to come into contact with potable water shall not constitute a toxic hazard, shall not support microbi
21、al growth and shall not give rise to unpleasant taste or odour, cloudiness or discoloration of the water. Concentrations of substances, chemicals and biological agents leached from materials in contact with potable water, and measurements of the relevant organoleptic/physical parameters shall not ex
22、ceed the maximum values recommended by the World Health Organization in its publication “Guidelines for drinking water quality” Vol.1 “Recommendations” (WHO, Geneva, 1984) or as required by the EEC Council Directive of15July1980 relating to the quality of water intended for human consumption (Offici
23、al Journal of the European Communities L229, 11-29), whichever in each case is the more stringent. NOTE 1Requirements for the testing of non-metallic materials in these respects are set out in the UK Water Fittings Byelaws Scheme Information and Guidance Note No. 5-01-02, ISSN02670313 obtainable fro
24、m the Water Research Centre, Water Byelaws Advisory Service, 660 Ajax Avenue, Slough, Berkshire SL14BG. NOTE 2Pending the determination of suitable means of characterizing the toxicity of leachates from materials in contact with potable water, materials approved by the Department of the Environment
25、Committee on Chemicals and Materials of Construction for use in Public Water Supply and Swimming Pools are considered free from toxic hazard for the purposes of compliance with this clause. A list of approved chemicals and materials is available from the Technical Secretary of that Committee at the
26、Department of the Environment, Water Division, Romney House,43Marsham Street, London SW1P3PY. NOTE 3Products manufactured for installation and use in the UnitedKingdom which are verified and listed under the UK Water Fittings Byelaws Scheme administered by the Water Research Centre (address as in no
27、te1) are deemed to satisfy the requirements detailed in this clause.BS 417-2:1987 2 BSI 08-1999 Section 2. Cisterns and lids 4 Designation 4.1 Cisterns Galvanized low carbon steel cisterns shall be designated by the appropriate BS type reference inTable 1, followed by the grade. 4.2 Lids Galvanized
28、low carbon steel lids for galvanized low carbon steel cisterns shall be designated as “lid for 1). . . . cistern” (seeTable 1). 5 Dimensions 5.1 Cisterns The dimensions of cisterns shall be as given in Table 1 subject to the tolerances specified in clause6. Cisterns shall be measured externally over
29、all (seeFigure 1). 5.2 Lids The dimensions of lids shall be as given inTable 1 subject to the tolerances specified in clause6. Lids shall be measured as shown inFigure 2. 6 Tolerances on dimensions The tolerances on the dimensions of cisterns and covers given inTable 1 shall be as follows: 1) Here i
30、nsert the appropriate BS type reference fromTable 1, e.g. “lid for SCM1600 cistern”. a) length: 13mm; b) width: 13mm; c) depth: 13mm; d) thickness of low carbonsteel plate and sheet before galvanizing: the relevant tolerances given in BS1449 or BS4360 shall apply. NOTEThis drawing is typical only an
31、d does not purport to indicate a standard method of construction. Figure 1 Method of measuring cisternsBS 417-2:1987 BSI 08-1999 3 Figure 2 Method of measuring and constructing lidsBS 417-2:1987 4 BSI 08-1999 Table 1 Dimensions of cisterns and lids 7 Materials 7.1 General Cisterns and lids shall be
32、made from low carbon steel plate or sheet complying with BS1449 or BS4360. NOTEThe plate or sheet should be free from any defects which would adversely affect the efficient functioning of the vessel or lid. 7.2 Galvanizing 7.2.1 Cisterns. Cisterns shall be galvanized, after manufacture, as specified
33、 in BS729. Before galvanizing, any flux and/or slag remaining after welding shall be removed. 7.2.2 Lids. Lids shall be either: a) made from ungalvanized sheet and be galvanized after manufacture as specified in BS729 except that where the thickness of a lid is less than1.2mm the average coating sha
34、ll be not less than330g/m 2 ; or b) made from galvanized low carbon sheet complying with class1A of BS2989. 8 Manufacture 8.1 Cisterns 8.1.1 General. Cisterns shall be constructed by welding. BS type reference a Cisterns Minimum thickness of steel before galvanizing, for cisterns and lids Lids Lengt
35、h b , L Width b , W Depth b , D Minimum capacity Distance of water line from top c Grade A cisterns Grade B cisterns Lids for cisterns No. of pieces Size of pieces Length Width mm mm mm L mm mm mm mm mm mm SCM 45 SCM 70 SCM 90 SCM 110 457 610 610 610 305 305 406 432 305 381 381 432 18 36 54 68 111 1
36、11 111 114 1.6 1.6 1.6 1.6 1.0 1.0 1.0 1.0 1 1 1 1 482 635 635 635 330 330 432 457 SCM 135 610 457 482 86 114 1.6 1.0 1 635 482 SCM 180 686 508 508 114 114 1.6 1.0 1 711 533 SCM 230 736 559 559 159 114 2.0 1.6 1.0 1 762 584 SCM 270 762 584 610 191 114 2.0 1.6 1.0 1 787 610 SCM 320 914 610 584 227 11
37、4 2.0 1.6 1.0 1 940 635 SCM 360 914 660 610 264 114 2.0 1.6 1.0 1 940 686 SCM 450/1 1219 610 610 327 114 2.0 1.6 1.0 1 1245 635 SCM 450/2 965 686 686 336 114 2.0 1.6 1.0 1 991 711 SCM 570 965 762 787 423 146 2.5 2.0 1.2 1 991 787 SCM 680 1092 864 736 491 146 2.5 2.0 1.2 1 1118 889 SCM 910 1168 889 8
38、89 709 146 2.5 2.0 1.2 1 1194 914 SCM 1130 1524 914 813 841 146 2.5 2.0 1.2 1 1549 940 SCM 1600 1524 1143 914 1227 146 3.2 2.5 1.6 2 787 1175 d SCM 2270 1829 1219 1016 1727 146 3.2 2.5 1.6 2 940 1251 d SCM 2720 1829 1219 1219 2137 190 3.2 2.5 1.6 2 940 1251 d SCM 4540 2438 1524 1219 3364 254 4.8 3.2
39、 1.6 3 838 1566 d NOTEFor tolerances see clause6. a Cisterns should be ordered by the BS type reference to avoid confusion. b These dimensions are external. c These dimensions were determined for the depths necessary to accommodate a float operated valve, inlet and overflow pipes in the sizes likely
40、 to be used, and in the positions, to satisfy water byelaws. The dimensions have been used in calculating the capacities. d The dimension is for the lapping piece the lapped piece; is5mm less.BS 417-2:1987 BSI 08-1999 5 8.1.2 Top edges. Cisterns shall be made in one of the following ways: a) with tu
41、rnover flange tops; b) with a continuous top stiffening of angle section; c) for cisterns of type references SCM45 to SCM270 inclusive, as in a) or b) or with their top edges stiffened by half inside rolling to a radius of not less than12mm, the intersections of the rolled sections being closely fit
42、ted and continuously welded; d) for cisterns of type references SCM45 or SCM70, as in a), b) or c) or with their top edges stiffened by turning or by the addition, by welding, of a strip of low carbon steel at least12mm wide and not less in thickness than the body material. Where cisterns are made w
43、ith turnover flange tops, they shall have a double turnover except that: 1) cisterns of type references SCM90 to SCM270 inclusive shall have either double turnover or single turnover flanges having a projection of not less than28mm; 2) cisterns made of4.8mm plates shall have either single or double
44、turnover flanges. 8.1.3 Corner plates. Cisterns shall be fitted with corner plates with the following exceptions: a) cisterns of type references SCM45 and SCM70; b) cisterns of type references SCM90 to SCM270 inclusive, where they have their top edges stiffened with either turnover or half inside ro
45、lled flanges, the intersections of which shall be closely fitted and continuously welded. 8.2 Lids Lids shall be capable of being fitted in accordance withFigure 2. For cisterns SCM40 to SCM1130 inclusive lids shall be in one piece and shall comply with the requirements for type A inFigure 2. For ci
46、sterns SCM1600, SCM2270 and SCM2720 lids shall be in two pieces and shall comply with the requirements for type B inFigure 2. Lids for cisterns SCM4540 shall be in three pieces and shall comply with the requirements for type C inFigure 2. Type A lids shall have25mm turned-down flanges on all edges.
47、The pieces of typeB lids and the end pieces of type C lids shall have25mm turned-down flanges on three edges as shown inFigure 2. The centre piece of a type C lid shall be flanged as shown inFigure 2. 9 Staying of cisterns 9.1 Types of cisterns to be stayed Cisterns shall be stayed as specified inTa
48、ble 2 (with reference to Figure 3). 9.2 Cross ties 9.2.1 General. The cross ties used for staying cisterns shall have a cross-sectional area of not less than200mm 2and shall be of either round, flat or angle section. NOTEThe purchaser should state in his enquiry or order which type of cross tie he r
49、equires (seeAppendix A). 9.2.2 Inside cross ties. The inside cross ties shall be securely fastened to angle cleats which shall be not less than40mm 40mm 5mm in the case of cisterns made of steel3.2mm thick or less, and not less than40mm 40mm 6mm in the case of cisterns made of steel more than3.2mm thick. The angle cleats shall be not less than150mm long and shall be secured to the wall of the cistern by welding. 9.2.3 Top cross ties. The top cross ties shall be welded to the top flange as specified in BS1140. The ends of
