BS-6920-2.2.2-2000.pdf
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1、BRITISH STANDARD BS 6920-2.2.2: 2000 Incorporating Corrigendum No. 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 the water Part 2: Methods of test Section 2.2: Odour and flavour of water Sub-section 2
2、.2.2: Method of testing odours and flavours imparted to water by hoses and composite pipes and tubes ICS 13.060.20 ? BS 6920-2.2.2:2000 This British Standard, having been prepared under the direction of the Health and Environment Sector Committee, was published under the authority of the Standards C
3、ommittee and comes into effect on 15 May 2000 BSI 4 August 2003 The following BSI references relate to the work on this British Standard: Committee reference EH/3/7 Draft for comment 99/560126 DC ISBN 0 580 33106 7 Committees responsible for this British Standard The preparation of this British Stan
4、dard was entrusted by Technical Committee EH/3, Water quality, to Subcommittee EH/3/7, Effects of materials on water quality, upon which the following bodies were represented: Association of Manufacturers of Domestic Electrical Appliances Automatic Vending Association of Britain British Bathroom Cou
5、ncil British Cement Association British Coatings Federation Ltd. British Malleable Tube Fittings Association British Non-Ferrous Metals Federation British Plastics Federation British Plumbing Fittings Manufacturers Association British Precast Concrete Federation Ltd. British Rubber Manufacturers Ass
6、ociation British Valve and Actuator Manufacturers Association British Water Department of the Environment for Northern Ireland The Drinking Water Inspectorate Galvanizers Association Laboratory of the Government Chemist Lead Development Association Pipeline Industries Guild UK Steel Association UK W
7、ater Byelaws Scheme Water Research Centre Water UK Zinc Development Association Amendments issued since publication Amd. No.DateComments 14418 Corrigendum No. 1 4 August 2003Change to reference in Clause 7 BS 6920-2.2.2:2000 BSI 4 August 2003 i Contents Page Committees responsibleInside front cover
8、Forewordii Introduction1 1Scope1 2Normative references1 3Terms and definitions1 4Principle2 5Reagents2 6Apparatus2 7Samples2 8Test procedure2 9Expression of results4 10Test report4 Annex A (informative) Test sequence5 Figure A.1 Test sequence5 BS 6920-2.2.2:2000 ii BSI 4 August 2003 Foreword This su
9、bsection of BS 6920 has been prepared by Subcommittee EH/3/7 under the direction of the Health and Environment Sector Committee. This subsection of BS 6920 supersedes BS 6920-2.2.2:1996, which is withdrawn. This edition introduces technical changes but it does not reflect a full review or revision o
10、f the standard. BS 6920 is published 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. S
11、ection 2.1: Samples for testing; Section 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 wa
12、ter by hoses for conveying water for 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. This pub
13、lication 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 front co
14、ver, pages i and ii, pages 1 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. BS 6920-2.2.2:2000 BSI 4 August 2003 1 Introduction Flexible hoses are usually manufactured by extrusion and therefore are subject to different process
15、ing conditions from moulded products. It is especially important therefore that flexible hoses for use with water intended for human consumption are tested in their final form. Many hoses are designed for use at mains pressure; these hoses are fabricated from the water-contact material, some form of
16、 reinforcement, e.g. polyamide or steel, and an outer covering which may be made of different material from the water-contact surface. In a similar way many pipes and tubes are composed of several layers; often the water-contact surface will differ from that used for the outside of the pipe/tube. In
17、 these products, the outer materials are not necessarily designed for use in contact with water intended for human consumption, and are not subject to the tests described in BS 6920. Experience has shown, however, that odour and flavour-imparting substances can diffuse from these outer non-water con
18、tact materials of the product through the water-contact material and thus affect the odour and flavour of the water. Thus samples of reinforced hoses and composite pipes/tubes have to be tested for their effect on the odour and flavour of water as complete hoses. The method described in BS 6920-2.2.
19、1 is not suitable for such products. Other hoses constructed from one material only (with or without any reinforcements) can be assessed for their ability to affect the odour and flavour of water using the modified test procedures described in BS 6920-2.2.3, if they are intended for conveying water
20、for food and drink preparation purposes. 1 Scope This subsection of BS 6920 describes a method designed to assess the ability of flexible hoses (including reinforcements) and composite pipes/tubes to impart a discernible odour or flavour to water intended for human consumption. NOTE 1A modified test
21、 for use with hoses intended for use in conveying water for food and drink preparation is described in BS 6920-2.2.3. NOTE 2Under the requirements of the Water Supply (Water Quality) Regulations (Regulation 25) and the Water Supply (Water Fittings) Regulations (Clause 2 of schedule 2), the National
22、Regulator may specify additional provisions in some cases and will assess the significance of the results obtained. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this section of BS 6920. For dated reference
23、s, 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 604, Specification for graduated glass measuring cylinders. BS 6920-1:2000, Suitability of non-metallic products for use in contac
24、t with water intended for human consumption with regard to their effect on the quality of the water Part 1: Specification. BS 6920-2.1:2000, 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
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