1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 6920-3:2000 ICS 13.060
2、.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water Part 3: High temperature testsThis British Standard, having been prepar
3、ed under the direction of the Health and Environment Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 May 2000 BSI 05-2000 The following BSI references relate to the work on this standard: Committee reference EH/3/7 Draft for comment 99/56013
4、2 DC ISBN 0 580 33112 1 BS 6920-3:2000 Amendments issued since publication Amd. No. Date Comments Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee EH/3, Water quality, to Subcommittee EH/3/7, Effects of materials on water
5、quality, upon which the following bodies were represented: Association of Manufacturers of Domestic Electrical Appliances Automatic Vending Association of Britain British Bathroom Council British Cement Association British Coatings Federation Ltd. British Malleable Tube Fittings Association British
6、Non-Ferrous Metals Federation British Plastics Federation British Plumbing Fittings Manufacturers Association British Precast Concrete Federation Ltd. British Rubber Manufacturers Association British Valve and Actuator Manufacturers Association British Water Department of the Environment for Norther
7、n Ireland The Drinking Water Inspectorate Galvanizers Association Laboratory of the Government Chemist Lead Development Association Pipeline Industries Guild UK Steel Association UK Water Byelaws Scheme Water Research Centre Water UK Zinc Development AssociationBS 6920-3:2000 BSI 05-2000 i Contents
8、Page Committees responsible Inside front cover Foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Principle 1 5 Apparatus 1 6 Samples 1 7 Test procedure 2 8 Expression of results 2 9 Test report 2ii BSI 05-2000 BS 6920-3:2000 Foreword This part of BS 6920 has b
9、een prepared by Subcommittee EH/3/7 under the direction of the Health and Environment Sector Committee. This part of BS 6920 supersedes BS 6920-3:1990, which is withdrawn. This edition introduces technical changes but it does not reflect a full review or revision of the standard. BS 6920 is publishe
10、d in several parts, namely Part 1: Specification, Part 2: Methods of test, Part 3: High temperature tests and Part 4: The GCMS identification of water leachable organic substances. Part 2 is further subdivided into a number of sections and subsections as follows. Section 2.1: Samples for testing; Se
11、ction 2.2: Odour and flavour of water; Subsection 2.2.1: General method of test; Subsection 2.2.2: Method of testing odours and flavours imparted to water by hoses and composite pipes and tubes; Subsection 2.2.3: Method of testing odours and flavours imparted to water by hoses for conveying water fo
12、r food and drink preparation; Section 2.3: Appearance of water; Section 2.4: Growth of aquatic microorganisms; Section 2.5: The extraction of substances that may be of concern to public health; Section 2.6: The extraction of metals. Annex A is informative. A British Standard does not purport to incl
13、ude 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 comprises a front cover, an inside front cover, pages
14、 i and ii, pages 1 and 2, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 05-2000 1 BS 6920-3:2000 Introduction Non-metallic products used in contact with hot and boiling water can leach water soluble compoun
15、ds not detectable in significant quantities when tested under the conditions of test described in BS 6920-2. Such products, if satisfactory in the tests described in part 2, can be tested by the methods described in this part of BS 6920 if they are intended for use in hot domestic water installation
16、s where the water in contact with the product will pass to a draw-off point and hence could be used for drinking or culinary purposes. Materials use in plastics kettles can also be assessed for suitability for drinking purposes using these tests. NOTE It is recommended that no boiling water tests ar
17、e undertaken on non-metallic products until these products have been shown to comply with the complete requirements of BS 6920, including an Odour and Flavour assessment undertaken at 858C. 1 Scope This part of BS 6920 describes methods designed to assess the ability of a non-metallic product to aff
18、ect hot and boiling water intended for human consumption by imparting a discernible odour or flavour, or any noticeable colour or turbidity. It is also applicable in assessing the leachability in hot or boiling water of metals from non-metallic products and the extraction from such products of subst
19、ances that may be of concern to public health. It is not applicable to the test for growth of aquatic microorganisms (see BS 692-2.4). Products used exclusively in industrial or steam services are excluded. 2 Normative references The following normative documents contain provisions which, through re
20、ference in this text, constitute provisions of this part of BS 6920. For dated references, subsequent amendments to or revisions of any of these publications do not apply. For undated references, the latest edition of the publication referred to applies. BS 6920-1:2000, Suitability of non-metallic p
21、roducts for use in contact with water intended for human consumption with regard to their effect on the quality of the water Part 1: Specification. BS 6920-2.2.1, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the qual
22、ity of the water Part 2: Methods of test Section 2.2: Odour and flavour of water Subsection 2.2.1: General method of test. BS 6920-2.2.2, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water Part 2:
23、Methods of test Section 2.2: Odour and flavour of water Subsection 2.2.2: Method of testing tastes imparted to water by hoses. BS 6920-2.2.3, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water Part
24、 2: Methods of test Section 2.2: Odour and flavour of water Subsection 2.2.3: Method of testing tastes imparted to water by hoses for conveying water for food and drink preparation. BS 6920-2.3, Suitability of non-metallic products for use in contact with water intended for human consumption with re
25、gard to their effect on the quality of the water Part 2: Methods of test Section 2.3: Appearance of water. BS 6920-2.4, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water Part 2: Methods of test Se
26、ction 2.4: Growth of aquatic microorganisms. BS 6920-2.5, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water Part 2: Methods of test Section 2.5: The extraction of substances that may be of concern
27、 to public health. BS 6920-2.6, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water Part 2: Methods of test Section 2.6: The extraction of metals. 3 Terms and definitions For the purposes of this pa
28、rt of BS 6920, the definitions given in BS 6920-2.1 apply. 4 Principle The product is immersed in test water at a temperature of between 308C and 858C in the manner set out in sections 2.2, 2.3, 2.5 and 2.6 of BS 6920. Additional testing in boiling water is carried out in a similar manner. 5 Apparat
29、us 5.1 Water bath or incubator, capable of maintaining a test container at the extraction temperature 28C (see 7.1). 6 Samples Samples shall comply with all the requirements of BS 6920-2.1:2000, 4.1, and any of those that apply to the sample in BS 6920 Section 2.1:2000, 4.2.2 BSI 05-2000 BS 6920-3:2
30、000 7 Test procedure 7.1 Hot water testing 7.2 Extraction temperature Store the sample in the test water during the extraction procedures (see 7.2) at the maximum water temperature for which the product is intended to be used (not lower than 308C) or 858C, whichever is the lower. 7.2.1 Extraction pr
31、ocedure Undertake each extraction procedure in accordance with that given in sections 2.2, 2.3, 2.5 and 2.6 of BS 6920 in a water bath or incubator (5.1) maintained at the required temperature (see 7.1.1). 7.2.2 Testing Before undertaking the measurements given in sections 2.2, 2.3, 2.5 and 2.6 of B
32、S 6920 as appropriate, allow each container plus test water and sample or reference container to cool to (25 2)8C. Then carry out the tests on the extracts from each sample as given in those sections. 7.3 Boiling water testing 7.3.1 Extraction procedure Place a sample with a total surface area of 15
33、 000 mm 2 into a 1.5 l clean borosilicate beaker. Add test water to give a total volume of 1 l, place a borosilicate glass watch-glass over the top of the beaker and then heat the water and sample to boiling point. Boil the water for (5 1) minutes. Cool the sample and water to (25 2)8C, add sufficie
34、nt test water to bring the total volume of water plus sample back to 1 l and collect the extract for the appropriate assessment(s). Into a second beaker place 1 l of test water and boil the water for (5 1) minutes. Cool the water to (25 2)8C and add sufficient test water to bring the total volume ba
35、ck to 1 l. 7.3.2 Testing Carry out the tests on the extracts from each sample in accordance with BS 6920-2. Apply the appropriate criteria in accordance with BS 6920-1 to assess the results obtained. NOTE Normally testing is limited to the “Odour and Flavour of Water Test”, BS 6920-2.2.1. If appropr
36、iate, on the basis of the result(s) on the first leachate, repeat the boiling periods, using the same test sample(s) and with fresh water on each occasion, for a maximum of seven 5 minute periods. 8 Expression of results Express the results for each test on a sample in accordance with the appropriat
37、e section of BS 6920-2. 9 Test report In addition to the requirements for the test report given in the appropriate section of BS 6920-2, include the temperature at which the test container plus sample and test water were maintained throughout the extraction period(s).blankBS 6920-3:2000 BSI 389 Chis
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