BS 417-2
Content
British Standard I S B ) c ( , y p o C d e l l o r t n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
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BRITISH STANDARD
Specification for
I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
Galvanized low carbon steel cisterns, cistern lids, tanks and cylinders — Part 2: Metric units
UDC [621.642.34 + 696.113] – 034.14
BS 417-2:1987
BS 417-2:1987
Committees responsible for this British Standard The preparation of this British Standard was entrusted 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 Combustion Equipment Manufacturers’ Association British Copper Cylinder Association British Gas plc British Non-ferrous Metals Federation I S Chartered Institute of Building B ) Copper Development Association c ( , Copper Tube Fittings Manufacturers’ Association y p Department of the Environment (Building Research Establishment) o C Department of the Environment (Department of Transport, Common Services) d e Department of the Environment (Property Services Agency) l l o Electricity Supply Industry in England and Wales t r n Galvanizers’ Association o c Heating and Ventilating Contractors’ Association n U Institute of Plumbing , 4 Royal Institute of Public Health and Hygiene 0 0 Solid Fuel Advisory Service 2 h Water Authorities Association c r a Water Companies Association MThis British Standard, having Waterheater Manufacturers’ Association 3 been prepared under the direction ion of the Buildin Building g 2 direct Zinc Development Association , Servic Services es Standa Standards rds Committee, Committee, h was published under the g authority ity of the Board of BSI u author o comes es r and com o int into o effect effect on b 30 September 1987 h g © BSI 08-1999 u o L f First published as BS 417 o October 1931 y t i First revision September 1936 s r Second revision e (War Emergency) 1940 v i n Third revision December 1944 UFourth revision August 1951 , Fifth revision January 1964 r z Sixth revision BS 417-2 Amendments issued since publication v October 1973 c o Seventh revision b Amd. No. Date of issue Comments l September 1987 r z v c The following BSI references o relate to the work on this b l standard: : Committee reference SEB/9 y p o Draft for comment 86/11843 DC C d e ISBN 0 580 15895 0 s n e c i L
BS 417-2:1987
Contents
Committees responsible Foreword
I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
© BSI 08-1999
Page Inside front cover iii
Section 1. General 1 Scope
1
2 3
1 1
Definitions Effect of non-metallic materials on water quality
Section 2. Cisterns and lids 4 Designation 5 Dimensions 6 Tolerances on dimensions 7 Materials 8 Manufacture 9 Staying of cisterns 10 Additional features 11 Testing 12 Marking
2 2 2 4 4 5 7 7 7
Section 3. Tanks 13 Designation 14 Dimensions 15 Tolerances on dimensions 16 Materials 17 Manufacture 18 Additional features 19 Testing 20 Marking
8 8 9 9 9 9 9 9
Section 4. Cylinders 21 Designation 22 Dimensions 23 Tolerances on dimensions 24 Materials 25 Manufacture 26 Design of cylinder top and bottom 27 Screwed connections for pipes 28 Additional features 29 Testing 30 Marking
10 10 10 10 10 10 13 14 14 14
Appendix A Information to be supplied by the purchaser
15
i
BS 417-2:1987
Figure 1 — Method of measuring cisterns Figure 2 — Method of measuring and constructing lids Figure 3 — Methods of staying cisterns Figure 4 — Method of measuring tanks Figure 5 — Method of measuring cylinders Figure 6 — Cylinder top and bottom details Figure 7 — Positions of screwed connections on cylinders
I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c ii i L
Table 1 — Table 2 — Table 3 — Table 4 — Table 5 —
Dimensions of cisterns and lids Staying of cisterns Dimensions of tanks Dimensions of cylinders Maximum height of cylinder top
Publications referred to
Page 2 3 6 8 10 12 13 4 5 8 11 13 Inside back cover
© BSI 08-1999
BS 417-2:1987
Foreword This Part of BS 417 has been prepared under the direction of the Building Services Standards Committee and is a revision of BS 417-2:1973 which is withdrawn. This revision became necessary in order to take account of the requirements of the New Model Water Byelaws 1986 and reflect the actions taken in the rrevision evision of other standards in this series. Seven standards, covering water storage vessels mainly for domestic use, now form a series to which others may be added when such a course is considered necessary. necess ary. Th The e six ot other her stan standards dards in this ser series ies are BS 699, BS 1565, B BS S 1566, BS 27 2777 77,, BS 319 3198 8 and and BS 4213 4213.. 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. I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
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 to iv, pages 1 to 16, an inside inside back back cove coverr and a back back cov cover. er. 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.
© BSI 08-1999
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I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c iv i L
blank
BS 417-2:1987
Section 1. General 1 Scope This Part of BS 417 specifies requirements for galvanized 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 are fr from om 18 L to 3 364 L in th the e ciste cistern rn rran ange ge,, fr from om 95 L to 15 155 5 L in th the e tank tank ran range ge an and d fr from om 73 L to 441 L in the cylinder cylinder range. range. The The cylinders cylinders ar are e intended for fixing in the vertical position.
I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
NOTE 1 The in informat formation ion to be supp supplied lied by the purchase purchaserr at the the time of enquiry or order is given in Appendix A. NOTE 2 The ttitles itles of the public publication ationss refer referred red tto o in tthis his standard are listed on the inside back cover.
2 Definitions For the purposes purposes of this Part of BS 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
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 exceed the maximum values recommended by the World Health inrits publication “Guidelines “Guidel ines forOrganization drinking water wate quality” Vol. 1 “Recommendations” (WHO, Geneva, 1984) or as required by the EEC Council Directive of 15 July 198 1980 0 relatin relating g to the q qual uality ity o off wate waterr intended for human consumption (Official Journal of the European Communities L229, 11-29), whichever in each case is the more stringent. NOTE 1 Requir Requirement ementss for the testin testing g of non-metal non-metallic lic ma material terialss in these respects are set out in the UK Water Fittings Byelaws Scheme Information and Guidance Note No. 5-01-02, ISSN 0267–0313 obtainab obtainable le from the Water Research Centre, Centre, Water Byelaws Advisory Service, 660 Ajax Avenue, Slough, Berkshire Berksh ire SL1 4BG. NOTE 2 Pendi Pending ng th the e dete determinat rmination ion of suitab suitable le means means of characterizing the toxicity of leachates from materials in contact with potable water, materials approved by the Department of the Environment 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 Department of the Environment, Water Division, Divisi on, Romney Ho House, use, 43 Marsham Marsham Street, London London SW1P SW1 P 3PY. 3PY. NOTE 3 Products Products ma manufact nufactured ured ffor or inst installat allation ion and use in the United Kingdom which are verified and listed under the UK Water Fittings Byelaws Scheme administered by the Water Research Centre (address as in note 1) are deemed to satisfy the requirements detailed in this clause.
the highest water level at which a cistern is designed to work 2.5 capacity (of a cistern) the capacity of a cistern 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 microbial growth and shall not give rise to unpleasant taste or odour, cloudiness or discoloration of the water.
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BS 417-2:1987
Section 2. Cisterns and lids 4 Designation
5.2 Lids
4.1 Cisterns
The dimensions dimensions of lids shall shall be as given in Table 1 subject to the tolerances specified in clause 6. Lids shall be measured measured as shown in Figure 2.
Galvanized low carbon steel cisterns shall be designated by the appropriate BS type reference in Table 1, followed followed by by the grade grade.. 4.2 Lids Galvanized low carbon steel lids for galvanized low carbon steel cisterns shall be designated as “lid for1) . . . . cistern” cistern” (see (see Table 1). 1).
6 Tolerances on dimensions The tolerances on the dimensions of cisterns and coverss given in Table 1 shall be as follows: cover a) length: b) width:
±
13 mm; mm;
±
13 mm; mm;
5 Dimensions c) depth: ± 13 mm; mm; I 5.1 Cisterns d) thickness of low the relevant S BThe dimensions of cisterns shall be as given in carbon carbo n steel plate and a nd tolerances given in ) c Table 1 subject to the tolerances specified in sheet before BS 1449 1449 or or B BS S 43 4360 60 ( , clause 6. Cisterns shall be measured externally galvanizing: shall apply. y p overa overall ll (see Figure Figure 1). o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L NOTE This drawing drawing is typic typical al only and does not purp purport ort to indica indicate te a standard standard method of construction construction.. f o Figure 1 — Method of measuring cisterns y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d 1) Here insert the appropriate BS type reference from Table 1, e.g. “lid for SCM 1600 cistern”. e s n e © BSI 08-1999 c 2 i L
BS 417-2:1987
I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
Figure 2 — Method of measuring and constructing lids
© BSI 08-1999
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BS 417-2:1987
Table 1 — Dimensions of cisterns and lids Minimum thickness of steel before galvanizing, for cisterns and lids
Cisterns BS type referencea
SCM 45 SCM 70 SCM 90 SCM 110
Lengthb, Widthb,
Distance Depthb, Minimum of water Grade A Grade B Lids for
L
W
D
mm
mm
mm
L
457 610 610 610
305 305 406 432
305 381 381 432
18 36 54 68
Lids
No. of
Size of pieces
capacity line from cisterns cisterns cisterns pieces Length topc mm
111 111 111 114
mm
1.6 1.6 1.6 1.6
mm
mm
1.0 1.0 1.0 1.0
1 1 1 1
Widt idth
mm
mm
482 635 635 635
330 330 432 457
I 610 457 482 86 114 1.6 1.0 1 635 482 S SCM 135 B SCM 180 686 508 508 114 114 1.6 1.0 1 711 533 ) c 736 559 559 159 114 2.0 1.6 1.0 1 762 584 ( SCM 230 , y SCM 270 762 584 610 191 114 2.0 1.6 1.0 1 787 610 p o 914 610 584 227 114 2.0 1.6 1.0 1 940 635 C SCM 320 d SCM 360 914 660 610 264 114 2.0 1.6 1.0 1 940 686 e l l SCM 450/1 1 219 610 610 327 114 2.0 1.6 1.0 1 1 245 635 o 965 686 686 336 114 2.0 1.6 1.0 1 991 711 t r SCM 450/2 n o c SCM 570 965 762 787 423 146 2.5 2.0 1.2 1 991 787 n U SCM 680 1 092 864 736 491 146 2.5 2.0 1.2 1 1 118 889 , 4 SCM 910 1 168 889 889 709 146 2.5 2.0 1.2 1 1 194 914 0 0 SCM 1130 1 524 914 813 841 146 2.5 2.0 1.2 1 1 549 940 2 h 1 143 914 1 227 146 3.2 2.5 1.6 2 787 1 175d c r SCM 1600 1 524 a SCM 2270 1 829 1 219 1 016 1 727 146 3.2 2.5 1.6 2 940 1 251d M 1 219 1 219 2 137 190 3.2 2.5 1.6 2 940 1 251d 3 SCM 2720 1 829 2 1 524 1 219 3 364 254 4.8 3.2 1.6 3 838 1 566d , SCM 4540 2 438 h NOTE E For tol tolera erance ncess see see cclau lause se 6. g NOT u a Cisterns should be ordered by the BS type reference to avoid confusion. o r b These dimensions are external. o c These dimensions were determined for the depths necessary to accommodate a float operated valve, inlet and overflow pipes in the b sizes likely to be used, and in the positions, to satisfy water byelaws. The dimensions have been used in calculating the capacities. h dimension is for the lapping lapping piece the lapp lapped ed piece; is 5 mm less. g d The dimension u o L 7 Materials 7.2.2 Lids. Lids. Lids Lids shall be either: f o a) made from ungalvanized sheet and be y 7.1 General t galvanized after manufacture as specified in i s r Cisterns and lids shall be made from low carbon BS 729 except that whe where re the thickness thickness of a lid is e steel plate or sheet sheet complying complying with BS 1449 or less tha than n 1.2 mm the av average erage coating c oating shall shall be not v i BS 43 4360 60.. 2 n less less th than an 330 330 g/m g/m ; or UNOTE The plate plate or sheet should be free from a any ny de defects fects which which , b) made from galvanized low carbon sheet r would adversely affect the efficient functioning of the vessel or z lid. comply com plying ing wi with th cla class ss 1A of BS 2989. 2989. v c o 7.2 Galvanizing b 8 Manufacture l Cisterns shall be galvanized, after Cisterns. Cisterns r 7.2.1 Cisterns. z manufac 8.1 Cisterns ture, as specified specified in BS 729. Before Before v manufacture, c galvanizing, any flux and/or slag remaining after 8.1.1 General. General. Cisterns Cisterns shall be constructed by o b welding. l welding shall be removed. : y p o C d e s n e © BSI 08-1999 c 4 i L
BS 417-2:1987
8.1.2 Top edges. edges. Cisterns shall be made in one of the following ways: a) with turnover flange tops; b) with a continuous top stiffening of angle section; c) for cisterns cisterns of type references references SCM 45 to SCM 270 inclusive, inclusive, as in a) or b) or with their top edges stiffened by half inside rolling to a radius of not less less than 12 mm, the intersections intersections of the rolled sections being closely fitted and continuously welded; I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
d) for cisterns cisterns of type references references SCM 45 or SCM 70, as in a), b) or c) or with their their top edges stiffened by turning or by the addition, by welding, of a strip of low carbon steel at least 12 mm wide and not less in in thick thickness ness tha than n the body material. Where cisterns are made with turnover flange tops, they shall have a double turnover except that: 1) cisterns cisterns of type type reference referencess SCM 90 to SCM 270 inclusive shall have either double turnover or single turnover flanges having a projection of not less le ss ttha han n 28 mm; mm; 2) cisterns cisterns made of 4.8 mm plates plates shall have either single or double turnover flanges. 8.1.3 Corner plates. plates. Cisterns shall be fitted with corner plates with the following exceptions: a) cisterns cisterns of type references references S SCM CM 45 and SCM SC M 70 70;; b) cisterns cisterns of type type reference referencess SCM 90 to SCM 270 inclusive, where they have their top edges stiffened with either turnover or half inside insid e rolled flanges, the intersections of which shall be closely fitted and continuously welded.
9 Staying of cisterns 9.1 Types of cisterns to be stayed Cisterns shall be stayed as specified in in Table 2 (with reference to Figure 3). 9.2 Cross ties 9.2.1 General. General. The The cross ties used for staying cisterns shall have a cross-sectional area of not less than han 200 mm2 and shall be of either round, flat or angle section. NOTE The purchase purchaserr shoul should d stat state e in his enquir enquiry y or ord order er which type of cross tie he requires (see Appendix A).
9.2.2 Inside cross ties. The ties. The inside cross ties shall be securely fastened to angle cleats which shall be not le less ss ttha han n 40 mm × 40 mm × 5 mm in th the e cas case e of cisterns cister ns made of of steel 3.2 mm thick or less, less, and not le less ss ttha han n 40 mm × 40 mm × 6 mm in th the e cas case e of cisterns ciste rns made of stee steell more than 3.2 mm thick. thick. The angle cleats shall be not lless ess than 150 mm long and shall be secured to the wall of the cistern by welding. 9.2.3 Top cross ties. The ties. The top cross ties shall be welded to the top flange flange as specif specified ied in BS 1140. The ends of the top cross ties shall be notched and fitted so that the vertical leg is inside the cistern as shown in Figure Figure 3(d). 3(d). Table 2 — Staying of cisterns BS type reference
Grade
Method of staying
SCM 1600 SCM 2270 SCM 2720
B A and B A and B
As in Figure 3(a) As in Figure 3(b) As in Figure 3(b)
SCM 4540 SCM 4540
A B
As in Figure 3(b) As in Figure 3(c)
8.2 Lids Lids shall be capable of being fitted in accordance with wit h Figure Figure 2. 2. For ciste cisterns rns SCM SCM 40 to SCM SCM 1130 inclusive lids shall be in one piece and shall comply with the requirements requirements for type A in Figure 2. For cister cisterns ns SCM SCM 1600, 1600, SCM SCM 2270 and and SCM SCM 2720 2720 lids shall be in two pieces and shall comply with the requirements requi rements for for type B in Figure 2. Lids for cisterns cisterns SCM 4540 shall be in three pieces pieces and shall comply with the requirements for type C in Fig Figure ure 2. Type Type A lids shall shall ha have ve 25 mm turned-down flanges on all edges. The pieces of type B lids and the end pieces pieces of type C lids shall have 25 mm turned-down turned-down flanges flanges on thre three e edges edges as shown sho wn in Figure Figure 2. The centre piece of a type C lid shall be flanged as shown sho wn in Figure Figure 2.
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BS 417-2:1987
I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c 6 i L
Figure 3 — Methods of staying cisterns
© BSI 08-1999
BS 417-2:1987
10 Additional features 10.1 Internal coating of cisterns for potable water Cisterns shall be supplied in either of the following conditions. a) The cistern shall not be coated internally. b) After testing in accordance with clause 11, 11, the internal surface shall be treated with an etch primer followed by two coats of bituminous solution soluti on complying complying with type 2 of BS 3416. I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
NOTE Unless Unless otherwise otherwise sp specified ecified by the purch purchaser aser at the time time of enquiry or order (see Appendix A) the cisterns will be supplied without internal coating. Where coating is required the manufacturer should ensure full curing of the final coat before delivery.
10.2 Internal coating of cistern lids for potable water Cistern lids shall be supplied in either of the following conditions.
11.2 After galvanizing as specified in BS 729, the 11.2 After finished finishe d cisterns cisterns shall be fill filled ed with water water to 25 mm above the water line after which they shall stand filled for a period period of not not less than than 2 min, and shall shall show no leak or permanent distortion. 11.3 After galvanizing as specified in BS 729, the 11.3 After finished cisterns shall be tested by immersion in water to 25 mm above the water line fo forr a period period of not less less than 30 s, and shall show no leak or permanent distortion.
12 Marking 12.1 Cisterns Cisterns shall be permanently and clearly marked by means of a label complyin complying g with BS 4781 or BS 5609 with the following following infor information: mation: a) the number and date of this British Standard2) and the BS type reference, grade and thickness, e.g. e.g. B BS S 417:1 417:198 987: 7: S SCM CM 360, 360, Gr Grade ade A A,, 2 mm;
a) The cistern lid shall not be coated internally.
b) the manufacturer’s name or identification
b) The internal surface of the supplied lid shall be treated with an etch primer followed by two coats of bituminous bituminous solution complying complying with with type 2 of BS 34 3416 16..
mark; c) the capacity in litres.
NOTE Unless Unless otherwise otherwise sp specified ecified by the purch purchaser aser at the time time of enquiry or order (see Appendix A) the cistern lids will be supplied without internal coating.
11 Testing 11.1 Cisterns shall be tested as specified in 11.2 11.2 exceptt cisterns of BS type reference excep reference SCM 40 to SCM 270 inclusive inclusive which shall be teste tested d either as specified in 11.2 11.2 or or as in 11.3 11.3..
The position of the marking shall be in the centre of one end or one side, as near the top edge as is practicable. 12.2 Lids Each lid, or each piece, comprised in one set of lids, shall be marked with: a) the BS type reference appropriate to the cistern cister n for which it is intended, e.g. SCM 360; b) the number and date of this British Standard, i.e i.e.. BS 417 417:198 :1987. 7.2) c) the manufacturer’s name or identification mark.
2)
Marking BS 417:1987 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturer’s responsibili ty. Enquiries as to the availability of third party certification should be addressed to the appropriate certification body.
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BS 417-2:1987
Section 3. Tanks 13 Designation
14 Dimensions
Galvanized low carbon steel tanks shall be designated by the appropriate BS type reference in Table 3, followed followed by by the grade grade..
The dimensions dimensions of tanks shall be as given given in Table 3 subject to the tolerances specified in clause 15 15.. Tanks shall be measured externally overall, but excluding the access cover, set screws or bolts and nuts (see (see Figure 4). Table 3 — Dimensions of tanks
BS type referencea
Outside dimensions Length, L
Width, Width, W
Height, H
Minimum capacity
Thickness of steel before galvanizing Grade A
Grade B 2b
Test pressure 69 kN/m Max. working head of water: 4.5 mc
Test pressure 52 kN/m2 b Max. working head of water: 3.0 mc
I S mm m mm m m mm m L mm mm B ) TM 114/1 610 432 432 95 3.2 2.5 c ( TM 114/2 610 610 305 95 3.2 2.5 , y TM 136/1 610 457 482 114 3.2 2.5 p o 2.5 3.2 123 381 610 C TM 136/2 610 2.5 3.2 155 508 508 686 d TM 182 e l NOTE E For toleran tolerances ces see cla clause use 15. 15. l NOT o a should be ordered by the BS type reference to avoid confusion. t r b 1Tanks kN/m2 = 1 kPa. kPa. n o c The working head is the vertical distance from the bottom of the tank to the water line of the cistern supplying the tank. c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v NOTE This drawing drawing is typica typicall only and does not purpor purportt to indicate a stand standard ard method of cons constructi truction on of tank, hand hole or access c o cover. b l Figure 4 — Method of measuring tanks r z v c o b l : y p o C d e s n e © BSI 08-1999 c 8 i L
BS 417-2:1987
15 Tolerances on dimensions
18 Additional features
The tolerances on the dimensions of tanks given in Table 3 shall shall be as follows: follows:
18.1 Tanks shall be supplied in either of the following conditions:
a) Length: b) Width: c) Height:
13 mm;
±
13 mm; ± 13 mm; ±
d) Thickness of low carbon steel plate and sheet before galvanizing: the relevant tolerances given in BS 1449 1449 or BS 4360 4360 shall shall appl apply. y. I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
16 Materials 16.1 General Tanks shall be made from low carbon steel plate or sheet, complying complying with with BS 1449 o orr BS 4360. NOTE The plate plate o orr sheet should be free free from any d defects efects which would adversely affect the efficient functioning of the vessel.
a) without fixing provision for combined immersion heaters and thermostats; b) with fixing provision for combined immersion heaters and thermostats as specified in 18.2 18.2.. NOTE Unless otherwise otherwise spec specified ified b by y the p purcha urchaser ser at the time time of enquiry or order (see Appendix A) the tank will be supplied without provision for combined immersion heater and thermostat.
18.2 Connec Connections tions shall shall be threaded threaded with a 2! in BSP.F normal class parallel thread complying with the requirem requirements ents of of Table 7 of BS BS 2779:1973 2779:1973 and the length of engagement shall be not less than han 13 mm. NOTE The recomme recommended nded h height eight of the centr centre e line of a sside ide entry immersion immersion heat heater er is 150 mm above the bottom bottom of the tank.
16.2 Galvanizing
19 Testing
Tanks shall be galvanized, after manufacture, as specified specif ied in BS 729. Before galvanizing galvanizing,, any flux and/or slag remaining after welding shall be removed.
After galvanizing, galvanizing, the finished tank shall withstand the appropriate appropriate test pressure pressure given in Table 3. The test shall be applied either:
17 Manufacture Tanks shall be constructed by welding. Tanks shall shall have have a hand hole hole not less than than 150 mm in diameter. The hand hole shall be provided p rovided with a replaceable access cover of a thickness not less than that of the wall of the tank and shall also be supplied complete with a preformed joint ring. The seating for the access cover shall be stiffened. NOTE The preferr preferred ed location location of of the hand h hole ole is that shown in Figure 4. The tank should be supplied with the hand hole in this position unless otherwise specified by the purchaser at the time of enquiry enquiry or order (see Append Appendix ix A).
a) hydraulica hydraulically lly for a period period of at least least 5 min; or b) pneumatica pneumatically lly for for a period period o off at le least ast 2 min. The tank shall show no leak or permanent distortion as a result of the test.
20 Marking Every tank shall be permanently and clearly marked, by means of a label complying with BS 4781 or BS 5609 in in the ccentre entre of the side containing the access cover, and as near the top edge as is practicable, with the following information: a) the number and date of this British Standard3) followed by the 7, BSTM type reference e.g. BS 417:1987, 417:198 136/1, Gradeand A; grade, b) the manufacturer’s name or identification mark; c) the capacity to the water line in litres; d) the maximum permissible working head of the t he tank in metres.
3)
Marking BS 417:1987 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturer’s responsibili ty. Enquiries as to the availability of third party certification should be addressed to the appropriate certification body.
© BSI 08-1999
9
BS 417-2:1987
Section 4. Cylinders 21 Designation
24 Materials
Galvanized low carbon steel cylinders shall be designated by the appropriate BS type reference in Table 4, followed followed by by the grade grade..
24.1 General
22 Dimensions
NOTE The plate plate or sheet should befunctioning free from a any nythe de defects fects w which hich would adversely aftect the efficient of vessel.
The dimensions of cylinders shall be as given in Table 4 subject to the tolerances tolerances specified specified in clause 23 23.. The height of a cylinder shall be measured externally from base to top of dome, excluding any screwed connection, and the diameter shall be measured measured internally internally (see Figure 5).
24.2 Galvanizing
I S B ) c ( , y p o C d e l l o t r n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o drawing is typ typical ical on only ly and does not purpor purportt to y NOTE This drawing t i indicate a standard method of construction. s r e Figure 5 — Method of measuring cylinders v i n U23 Tolerances on dimensions , r z The tolerances on the dimensions of cylinders given v c in Table 4 shall be as follows: o b l a) position position of of screwed screwed co connecti nnections: ons: 3 mm in any r direction; z v c ± 5 mm; o b) diameter: b l c) height: ± 13 mm; : y p d) thickness of low carbon steel plate before o galvanizing; the relevant tolerances given in C 1449 or BS 4360 shal shalll appl apply. y. d BS 1449 e s n e c 10 i L
Cylinders shall be made from low carbon steel sheet or plate plate com complying plying with BS BS 1449 o orr BS 4360.
Cylinders shall be galvanized, after manufacture, as specified in BS BS 729. Before galvanizing any flux and/or slag remaining after welding shall be removed.
25 Manufacture Cylinders shall be constructed by welding.
26 Design of cylinder top and bottom 26.1 Top The top of the cylinder [see [see Figure 6(a)] 6(a)] shall have a radius of curvature not exceeding three quarters of the nominal diameter of its body. The height of the top, excluding any spinning location recess, shall comply with with Table 5. The top curve shal shalll be blended, by means means of a radius not le less ss than 25 mm or more than 50 mm, to form a straight straight portion portion to meet the body. 26.2 Bottom The bottom of a cylinder shall have a radius of curvature not exceeding three quarters of the nominal diameter of its body. The cylinder bottom shall be either: a) without an extended extended flange [see Figure Figure 6(b)]; or b) with an extended flange flange [see Figure 6(c)]. 6(c)]. The radius adjacent to, thebeflange connecting the curved cur ved at, endand tto o the body body shall betwe between en 25 mm and and 50 mm in b both oth ccas ases es.. Where the flange is extended, as in option b), to remove the welded seam from the curved portion, the maximum upstand of the flange shall be in accordance accor dance with Figure 6( 6(c). c).
© BSI 08-1999
I S B ) c ( , y p © o B C S I d 0 e 8 l l -1 9 o r 9 9 t n o c n U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o
Table 4 — Dimensions of cylinders BS type referencea
Inside diameterb (see Figure 5), B
Height over dome (see Figure 5) A
mm
Minimum capacity
mm
Thickness of steel sheet or plate before galvanizing, for sides and dished ends Grade A
Grade B
Grade C
Test pressure 483kN/m2 c
Test pressure 276 kN/ kN/m m2 c
Test pressure 138 kN kN/m /m2 c
Max. working head of water: 30 md
Max. working head of water: 18 md
Max. working head of water: 9 md
L
mm
mm
mm
Height of screwed connections (see Figure 7) H (min.)
mm
L
P
Size of connections BSP. F parallel thread
mm
mm
YM 91 YM 114 YM 127 YM 141
381 381 457 457
762 991 787 838
73 100 114 123
3.2 3.2 3.2 3.2
2.5 2.5 2.5 2.5
2.0 2.0 2.0 2.0
584 762 584 635
102 102 102 102
159 159 159 159
1 1 1 1
in
YM 150 YM 177 YM 218 YM 264
457 457 508 508
914 1 067 1 067 1 295
136 159 195 241
3.2 3.2 4.8 4.8
2.5 2.5 3.2 3.2
2.0 2.0 2.5 2.5
686 813 813 991
102 102 102 102
159 159 159 159
1 1! 1! 1!
YM 355 YM 455
610 610
1 219 1 600
332 441
4.8 4.8
3.2 3.2
2.5 2.5
914 127 1 194 127
159 159
1" 1"
NOTE For toler toleranc ances es see see cla clause use 23 Cylinders should be ordered by the BS type reference to avoid confusion. To obtain the approximate approximate outs outside ide diameter, add 13 mm for welded seams. c 1 kN/m2 = 1 kPa. d The working head is the vertical distance from the bottom of the cylinder to the water line of the cistern supplying the cylinder.
a b
B S
4 1 7 -2 : 1 9 8 7
C d e s n 1 e 1 c i L
BS 417-2:1987
I S B ) c ( , y p o C d e l l o r t n o c n
U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c 12 i L
Figure 6 — Cylinder top and bottom details
© BSI 08-1999
BS 417-2:1987
Table 5 — Maximum height of cylinder top Inside diameter (se (see e Table Table 4)
Maximum height dimension X X [see Figure Figure 6(a) 6(a)]]
mm
mm
381
125
457
140
508
150
610
180
27 Screwed connections for pipes I S B ) c ( , y p o C d e l l o r t n o c n
27.1 Pipe connections shall be square to the face of the cylinder. NOTE The preferre preferred d number, number, position position and size size of screwed connections connec tions for pipes ar are e shown in Figur Figure e 7 and given in Table Table 4. The connections should be in accordance accordance with Figure 7 and Table 4 unless otherwise specified by the purchaser at the time of enquiry enquir y or order (see Append Appendix ix A).
27.2 External threads shall comply with Table 3M, class B of BS 2779:1973 2779:1973 with a length of threaded threaded portio por tion n of not not less less tha than n 13 mm. Internal Intern al threads shall comply comply with Table 4M of BS 2779:1973 2779:1973 with a length of threaded port portion ion of no nott lles esss th than an 11 mm. The minimum thickness of metal below the root of any thread with the exclusion of one pitch from the free fre e end sh shall all be no nott less than than 0.7 mm. These connections shall be parallel threaded for use with fittings fittings complying with BS 864-2. Taper thread thread attachments shall not be used. 27.3 Connections which of are attached by mechanical means shall be capable withstanding an applied torque of 100 N· N·m m in both directions directions without rotating or distorting. The connection in the top of a cylinder shall be housed in a projection in such a way as to prevent the formation of an air pocket.
U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
Figure 7 — Positions of screwed connections on cylinders
13
© BSI 08-1999
BS 417-2:1987
28 Additional features 28.1 Fixing provision for combined immersion heaters and thermostats 28.1.1 Cylinders shall be supplied in either of the following conditions: a) without fixing provision for combined immersion heaters and thermostats; b) with fixing provision for combined heaters and a nd thermostats as specified in 28.1.2 28.1.2.. NOTE Unless otherwise otherwise specified specified by by the p purcha urchaser ser at the the time of enquiry or order (see Appendix A) the cylinder cylinder will be supplied without fixing provision for combined immersion heaters and I thermostats. S BIt is recommended that any connections for i mmersion heaters ) should be fitted during manufacture of the cylinders and not c subsequently. If not required immediately they may be ( , temporarily blanked off.
y p 28.1.2 Connections shall be threaded internally o with th a G 2! thread, complying with the Cwi requirements ements of Table Table 4M of BS BS 2779:1973, 2779:1973, and the d requir e length of threaded l threaded portion portion shall be between between 13 mm l o and 15 mm. The minimum thickness thickn ess of metal below r t n the root of the thread, with the exclusion of one pitch o the free end, shall shall be not less less than 0.7 mm. c from the n
28.2.2 A hand hole shall be not less than 150 mm in 28.2.2 A diameter, and shall be provided with a replaceable access cover of a thickness not less than that of the wall of the cylinder and shall also be supplied complete with a suitable preformed joint ring. The seating for the outer access plate shall be adequately stiffened. NOTE The preferred preferred locati location on of tthe he han hand d hole is tha thatt shown shown in Figure 5. The cy cylinder linder should be supplied with the hand hole in this position unless otherwise specified by the purchaser at the time of enquiry or order (see Appendix A).
29 Testing After galvanizing, the finished cylinders shall be filled with water and shall withstand for a period of not less less than 5 min the appropriate appropriate test test pres pressures sures given in Table 4, and shall sh show ow no leak or permanent distortion.
30 Marking 30.1 Permanent marking Every cylinder shall be permanently and clearly marked, by stamping, embossing or etching on the body of the cylinder or on a metal plate soldered to
UThe connection for a top entry immersion heater , be fitted fitted at a m minimum inimum distanc distance e of 25 mm from 4 shall be 0 the centre connection connection as shown shown in Figure 7 in such 0 format ion of an air pocket. 2 a way as to minimize the formation h It shall be possible to fit an immersion heater c complying ing with the requirements requirements of BS 3456-2.21 3456-2.21 r comply a and of length ( B minus B minus 200) mm withou wit hout t it touchin touching g M any part of the cylinder wall, cylinder bottom or 3 2 primar y heater (se (see e Figure 7). 7). , primary h g The connection for side entry immersion heaters u shall be situated situated as shown in Figure 7 and at a o r height P (see (see Table 4) above above the base of the cylinder. cylinder. o height P b NOTE 1 Attention Attention is direct directed ed to the the fact that, that, with with the top entry entry h g method of mounting, the quantity of water heated is dependent u upon the length of the immersion heater and integral thermostat. o n insul insulation ation jjacket acket is fitt fitted ed it should should comply comply L NOTE 2 Where aan f with the requirement requirementss of BS 5615 5615.. o y 28.2 Hand hole t i s r 28.2.1 Cylinders shall be supplied in either of the e following conditions: v i n a) without a hand hole;
the body of the cylinder, with the following information: a) the number and date of this British Standard4) followed by the BS type reference and grade, e.g.. BS 417 e.g 417:198 :1987, 7, YM 355, 355, Grade Grade A; b) the manufacturer’s name, or identification mark. 30.2 Other marking The following additional marking in indelible ink shall be applied by means of a label complying with BS 4781 or BS 5609 firmly firmly adhe adhering ring to the cyl cylinder: inder: a) the maximum permissible working head of the cylinder in metres; b) the storage capacity in litres; c) the maximum length of immersion heater that the cylinder is designed to accept; d) the recommended location for an immersion heater connection when not fitted at the time of manufacture (see note to 28.1.1 28.1.1). ).
b) with a hand hole as specified in 28.2.2 28.2.2.. U , r z otherwise specified specified by by the p purcha urchaser ser at the the time v NOTE Unless otherwise c of enquiry or order (see Appendix A) the cylinder cylinder will be supplied o without a hand hole. b l r z v c o b l : y p 4) o Marking BS 417:1987 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to responsibility. sponsibility. Enquiries as Cthe requirements of the standard. The accuracy of such a claim is therefore solely the manufacturer’s re d to the availability of third party certification should be addressed to the appropriate certification body. e s n e © BSI 08-1999 c 14 i L
BS 417-2:1987
Appendix A Information to be supplied by the purchaser When enquiring about or ordering cisterns, cistern lids, tanks or cylinders to comply with the requirements requi rements of this Part of BS 417, the purchaser purchaser should provide the manufacturer with the following information. a) BS type reference, such as SCM 360 or TM 136/1 136/1 or YM YM 355 (see (see Tabl Table e 1, Tab Table le 3 and Tabl Table e 4). 4). I S B ) c ( , y p o C d e l l o r t n o c n
b) Grade of cistern (A or B), tank (A or B) or cylinder cylin der (A, B or C) (see Tab Table le 1, Table 3 and Tabl Table e 4). 4). c) Details of screwed connections and holes, if required (see clauses 10, 10, 18 18,, and 28). 28).
d) For cisterns: 1) if lid is not required; 2) type of cross ties (see clause 9); 3) if coating internally with bitumen is required (see clause 10 10). ). e) For tanks: location of hand hole, if not as Figure 4 (see clause 17 17). ). f) For tanks and cylinders: whether accommodation for an immersion heater and thermostat is required, and in what position (see clauses 18 and 28 ). 18 and 28). g) For cylinders: if a hand hole is required and, if so, in what location (see clause 28 28). ).
U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
I S B ) c ( , y p o C d e l l o r t n o c n
© BSI 08-1999
15
U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c 16 i L
blank
BS 417-2:1987
Publications referred to BS 699, Specification for copper direct cylinders for domestic purposes5). BS 729, Specification for hot dip galvanized coatings on iron and steel articles. BS 864, Capillary and compression tube fittings of copper and copper alloy. BS 864-2, Specification for capillary and compression fittings fi ttings for copper tubes. BS 1140, Specification for resistance spot welding of uncoated and coated low carbon steel. BS 1449, Steel plate, sheet and strip. BS 1565, Specification for galvanized mild steel indirect cylinders, annular or saddle-back type 5). BS 1566, Copper indirect cylinders for domestic purposes5). BS 1566-1, Specification for double feed indirect cylinders. BS 1566-2, Specification for single feed indirect cylinders. I S B ) c ( , y p o C d e l l o r t n o c n
BS 2777, Specification for asbestos-cement cisterns5). BS 2779, Specification for pipe threads for tubes and fittings fi ttings where pressure-tight joints are not made on the threads (metric dimensions). BS 2989, Specification for continuously hot-dip zinc coated and iron-zinc alloy coated steel: wide strip, sheet/ plate sheet / plate and slit wide strip. BS 3198, Specification for copper hot water storage combination units for domestic purposes5). BS 3416, Specification for black bitumen coating solutions for cold application. BS 3456, Specification for safety of household and similar electrical appliances. BS 3456-2.21, Electric immersion heaters. BS 4213, Specification for cold water storage and feed and expansion cisterns (polyolefin or olefin copolymer) and cistern lids5).
U , 4 0 0 2 h c r a M 3 2 , h g u o r o b h g u o L f o y t i s r e v i n U , r z v c o b l r z v c o b l : y p o C d e s n e c i L
and cistern lids . BS 4360, Specification for weldable structural steels. BS 4781, Specification for self-adhesive plastics labels for permanent use. BS 5609, Specification for adhesive coated labels for marine use. BS 5615, Specification for insulating jackets for domestic hot water storage cylinders.
5)
Referred to in the foreword only.
© BSI 08-1999
BS 417-2:1987
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