1、BRITISH STANDARD BS 4213:2004 Cisterns for domestic use Cold water storage and combined feed and expansion (thermoplastic) cisterns up to 500 l Specification ICS 91.140.60 BS 4213:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 10 March
2、2004. BSI 10 March 2004 First published October 1967 Second edition September 1975 Third edition August 1986 Fourth edition May 1991 Fifth edition March 2004 The following BSI references relate to the work on this British Standard: Committee reference PRI/62 Draft for comment: 02/122802 DC ISBN 0 58
3、0 43333 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/62, Static thermoplastics tanks, upon which the following bodies were represented: Association of Tank and Cistern Manufacturers British Chemical Distributors
4、and Traders British Plastics Federation Chemical Industries Association (CIA) Federation of Petroleum Suppliers Institute of Materials, Minerals and Mining Oil Firing Technical Association (OFTEC) Water UK Welding Institute Co-opted members Amendments issued since publication Amd No. Date CommentsBS
5、 4213:2004 BSI 10 March 2004 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative references 1 3T e r m s a n d d e f i n i t i o n s 1 4G e n e r a l 2 5M a t e r i a l s 3 6 Configuration 3 7 Performance requirements 3 8C o v e r s 6 9M a r k i n g 7 10 Ad
6、ditional fittings 8 Annex A (informative) Notes on installation of cisterns 10 Annex B (normative) Method of test for determination of toluene extract of carbon black 10 Annex C (normative) Sampling and testing 11 Annex D (normative) Methods of test for resistance to deformation 12 Annex E (normativ
7、e) Method of test for resistance to deflection 13 Annex F (normative) Method of test for fatigue resistance 15 Annex G (normative) Method of test for impact resistance 15 Annex H (normative) Method of test for tensile strength and elongation at break 15 Annex I (normative) Method of test for resista
8、nce to reversion 16 Annex J (normative) Method of test for resistance to sprue strain 16 Annex K (normative) Method of test for resistance to delamination 17 Annex L (normative) Method of test for weathering 17 Annex M (normative) Method of test for hot water resistance 17 Annex N (normative) Method
9、 of test for closeness of cover fitting 19 Annex O (normative) Method of test for the assessment of ingress of particles 21 Annex P (normative) Method of test for determining the impact resistance of covers 22 Annex Q (normative) Method of test for thermal insulation 22 Bibliography 25 Figure 1 Inst
10、allation instructions 7 Figure D.1 Centreline measurement 13 Figure E.1 Arrangement for the deflection test and fatigue test 14 Figure M.1 Typical installation for hot water test: elevation 18 Figure M.2 Typical installation for hot water test: plan view 19 Figure N.1 Typical installation for cover
11、fitting test 20 Figure O.1 Typical installation of cistern in test box for the particle ingress test 21 Figure Q.1 Apparatus for the insulation test 23 Table 1 Position of water line 2 Table 2 Types of delamination 5 Table C.1 Type tests 11 Table C.2 Routine tests 12 Table I.1 Testing conditions for
12、 reversion and sprue strain 16 Table K.1 Immersion media 17BS 4213:2004 ii BSI 10 March 2004 Foreword This British Standard has been prepared by Technical Committee PRI/62. It supersedes BS 4213:1991, which will be withdrawn three months after the publication date of this revision. The specification
13、 covers cisterns up to 500 l capacity from which water is drawn for domestic purposes. It provides methods of test for the evaluation of the properties of cisterns and covers made by any of the processes currently available. This new edition represents a full revision of the standard. It takes into
14、account the Water Supply (Water Quality) Regulations 2001 1, the Water Supply (Water Quality) (Scotland) Regulations 2001 and subsequent amendments 2 and the Water Supply (Water Quality) Regulations (Northern Ireland) 2002 and subsequent amendments 3, which include detailed provisions to safeguard t
15、he integrity of stored water for domestic (i.e. drinking, washing, cooking and sanitary) purposes. It also takes into account EC Directive 98/83/EC 4, which implies that water quality from any domestic draw-off point should be of drinking water quality. It includes requirements for both cisterns and
16、 their associated fittings to assist in safeguarding against waste and contamination, and insulation requirements to reduce the likelihood of the stored water freezing or warming. It also gives a method of test for the assessment of the ingress of particles and insects. As in the previous editions,
17、the specification is confined to cisterns produced from thermoplastics, although an outer reinforcing layer of an unspecified composition is permitted. As a result of problems encountered when analysing processed material, this British Standard requires all materials to conform to BS 6920-1. The det
18、ails of the analytical methods for determining the permitted antioxidants are not given in this British Standard, but reference is made to the relevant methods in BS 2782. Because slight changes are necessary in plumbing practice when using thermoplastics cisterns as opposed to more rigid materials,
19、 additional recommendations for installation are given in Annex A. Upon publication of this revision, BSI Sales Department will respond to purchase orders for BS 4213 by supplying copies of the 2004 edition. Copies of the 1991 edition may be obtained until it is withdrawn by quoting BS 4213:1991. Th
20、is publication does not purport to include all the necessary provisions of a contract. Users are responsible for its 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 fr
21、ont cover, pages i and ii, pages 1 to 25 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 4213:2004 BSI 10 March 2004 1 1 Scope This British Standard specifies requirements for the materials, physical properties and performance of c
22、old water storage cisterns and combined feed and expansion cisterns of up to 500 l capacity, from which water is drawn for domestic purposes. It also specifies requirements for the associated fittings of such cisterns, i.e. covers, screened breathers, screened warning pipes and vent pipe entry devic
23、es, and for cistern insulation. It gives methods of test for the evaluation of the properties of cisterns and covers made by any of the processes currently available. This British Standard applies only to cisterns that are manufactured from thermoplastics, and that have covers manufactured either fr
24、om thermoplastics or from other manufactured materials having a thermoplastics layer on the inside face. It covers both circular and non-circular cisterns, but does not apply to flushing cisterns. 2 Normative references The following referenced documents are indispensable for the application of this
25、 document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS 1566-1:2002, Copper indirect cylinders for domestic purposes Part 1: Open vented copper cylinders Requirements and test method
26、s. BS 2071, Specification for Soxhlet extractors. BS 2782-4:Method 452B, Methods of testing plastics Chemical properties Determination of carbon black content of polyolefin compound. BS 2782-8:Methods 823A and 823B:1978, Methods of testing plastics Other properties Methods for the assessment of carb
27、on black dispersion in polyethylene using a microscope. BS 4781, Specification for pressure-sensitive adhesive plastics labels for permanent use. BS 6920-1, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of
28、 the water Part 1: Specification. BS EN 1057, Copper and copper alloys Seamless, round copper tubes for water and gas in sanitary and heating applications. BS EN 60335-2-73, Specification for safety of household and similar electrical appliances Part 2: Particular requirements Section 2-73: Fixed im
29、mersion heaters. BS EN ISO 527-1 (BS 2782-3:Method 321), Plastics Determination of tensile properties Part 1: General principles. BS EN ISO 4892-2, Plastics Methods of exposure to laboratory light sources Part 2: Xenon-arc sources. 3 Terms and definitions For the purposes of this British Standard th
30、e following definitions apply. 3.1 additional fitting kit assembly of additional fittings for a cistern 3.2 capacity volume of a cistern measured up to the water lineBS 4213:2004 2 BSI 10 March 2004 3.3 cisterns 3.3.1 cistern fixed container for holding water at atmospheric pressure NOTE The water i
31、s usually supplied through a float-operated valve. 3.3.2 cold water storage cistern cistern, including cover and additional fitting kit (3.1), used only for storing cold water for domestic (i.e. drinking, washing, cooking and sanitary) purposes 3.3.3 combined feed and expansion cistern cistern used
32、for supplying water to and receiving expansion water from a hot water system 3.4 pipes 3.4.1 breather pipe or hole which allows the free exchange of air when the cistern is emptying and filling and which preserves the integrity of the stored water 3.4.2 warning pipe pipe that indicates fault conditi
33、ons, fixed so that its outlet, whether inside or outside the building, is in a conspicuous position where the discharge of water can be seen 3.4.3 vent pipe pipe open to the atmosphere and used in connection with a hot water system for the escape of air and/or steam 3.5 top of a cistern plane across
34、 the highest point of a cistern excluding any extension of the cistern provided for supporting or securing the removable cover NOTE This definition applies to cisterns with part integral or integral covers only. 3.6 water line line marked inside a cistern to indicate the highest water level at which
35、 the float-operated valve (or other water inlet-control device) should be adjusted to shut off 4 General The wall thickness of a cistern shall be not less than 1.5 mm. The water line position as specified in Table 1 shall be clearly and durably marked by moulded impression on the wall of the cistern
36、. Table 1 Position of water line Cistern type reference a Minimum capacity to water line Minimum distance of water line from top of cistern l (gallon) b mm Up to and including XX8 38 (8) W110 Including and above XX15 68 (15) W115 aSee 9.1. b1 gallon = 4.546 09 lBS 4213:2004 BSI 10 March 2004 3 5 Mat
37、erials 5.1 General All materials used for cisterns, covers and additional fittings that are, or are likely to be, in contact with water (including condensation) shall conform to the requirements of BS 6920-1. 5.2 Carbon black Where carbon black is used it shall conform to the following requirements.
38、 a) When tested in accordance with BS 2782-4:Method 452B, the carbon content shall be not less than 0.5 % and not greater than 3.0 %. b) The density shall be W1.5 g/cm 3and u2.0 g/cm 3 . c) The total amount of volatile matter shall not exceed a mass fraction of 9.0 %. d) The average particle size sh
39、all be not less than 0.010 4m and not greater than 0.025 4m. e) When determined in accordance with Annex B, the total amount of toluene extract shall not exceed a mass fraction of 0.10 %. f) When tested in accordance with BS 2782-8:Method 823A, the carbon black dispersion in the cistern shall show a
40、 numerical rating of 3 or less and the uniformity of appearance in respect of smears and streaks shall be equal to or better than photomicrograph A of BS 2782-8:Method 823A:1978, Figure 1. 5.3 Rework No rework material, other than the addition of a mass fraction no greater than 15 % of the manufactu
41、rers own rework material of the same type, resulting from the manufacture of cisterns conforming to the requirements of this British Standard, shall be used. 6 Configuration Where a change in direction of the cistern wall is necessary, this shall be accomplished by the use of a radius not less than
42、3 mm. Where the walls of a cistern within 115 mm of the top or bottom of the cistern are tapered, the taper shall not exceed 5 from the vertical, except where ribs are positioned. Where a connection passes through the cistern, a means of excluding external condensate shall be provided. NOTE 1 The ci
43、stern surface should have an even texture and should be free from surface imperfections, which detract from the performance of the cistern in use. NOTE 2 Any backing plate for a float-operated valve to be fixed externally to the cistern is normally supplied treated to prevent corrosion, free from sh
44、arp edges or sharp corners and drilled to provide a 22 mm diameter hole. NOTE 3 Ribs should not interfere with pipe installation. 7 Performance requirements 7.1 General The tests cited in 7.2 to 7.11 shall be carried out as either type tests or routine tests in accordance with Annex C. 7.2 Resistanc
45、e to deformation 7.2.1 Circular cisterns When tested in accordance with Annex D, method 1, the difference between the circumferential measurements of a circular cistern shall be not greater than 2 % of the original circumferential measurement. 7.2.2 Non-circular cisterns When tested in accordance wi
46、th Annex D, method 2, the deformation in either direction of a non-circular cistern shall be not greater than 2 %. 7.3 Resistance to deflection When measured in accordance with Annex E, the deflection shall not exceed 32 mm.BS 4213:2004 4 BSI 10 March 2004 7.4 Fatigue resistance When tested in accor
47、dance with Annex F, there shall be no cracking of the cistern in the region of the inlet hole. 7.5 Impact resistance When tested in accordance with Annex G, any impact shall neither split nor puncture the cistern. 7.6 Tensile strength and elongation at break When tested in accordance with Annex H, t
48、he ultimate tensile strength of the polyolefin fitting of the wall of the cistern shall be not less than 7.6 MPa. The percentage elongation at break of the specimens from both horizontal and vertical axes shall be not less than: a) 100 % for polyethylene; b) 50 % for polypropylene. 7.7 Resistance to
49、 reversion NOTE This requirement is applicable to injection moulded cisterns only. When tested in accordance with Annex I, each specimen taken from a single cistern shall have a percentage reversion not greater than: a) 5.0 % for polyethylene with a density less than 0.94 g/cm 3 ; b) 3.0 % for polyethylene with a density of 0.94 g/cm 3and above; c) 2.0 % for polypropylene. 7.8 Resistance to sprue strain NOTE This requirement is applicable
