BS 6920-1-2014 Suitability of non-metallic materials and products for use in contact with water intended for human consumption with regard to their effect on the quality of the wat.pdf

1、BSI Standards PublicationBS 6920-1:2014Incorporating Corrigendum No.1Suitability of non-metallicmaterials and products foruse in contact with waterintended for humanconsumption with regard totheir effect on the quality ofthe waterPart 1: SpecificationPublishing and copyright informationThe BSI copyr

2、ight notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2014Published by BSI Standards Limited 2014ISBN 978 0 580 87823 7ICS 13.060.20The following BSI references relate to the work on this document:Committee reference EH/6Draft for commen

3、t 13/30287562 DCPublication historyFirst published 31 May 1988Second edition, 29 June 1990Third edition, 15 December 1996Fourth edition, 15 May 2000Fifth (present) edition, June 2014Amendments issued since publicationDate Text affectedOctober 2014 Clause 5, Figures B.1 and B.2BS 6920-1:2014 BRITISH

4、STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 24 Odour and flavour of water 25 Appearance of water 36 Growth of aquatic microorganisms 37 The extraction of substances that may be of concern to public health 48 The extraction of metals and boron 59 High temperatu

5、re tests 610 Odour and flavour of water from hoses intended for food and drinkapplication 7AnnexesAnnex A (informative) Scheme of testing showing the relationship between thestandards of the BS 6920 series 8Annex B (informative) Odour and flavour of water test Assessment ofresults 9Bibliography 11Li

6、st of figuresFigure A.1 Scheme of testing showing the relationship between the standardsof the BS 6920 series 8Figure B.1 Chlorine-free water test results 9Figure B.2 Chlorinated water test results 10List of tablesTable 1 Maximum allowable concentrations of certain elements 5Summary of pagesThis doc

7、ument comprises a front cover, an inside front cover, pages i to iv,pages 1 to 12, an inside back cover and a back cover.BRITISH STANDARD BS 6920-1:2014 The British Standards Institution 2014 iForewordPublishing informationThis part of BS 6920 is published by BSI Standards Limited, under licence fro

8、mThe British Standards Institution, and came into effect on 30 June 2014. It wasprepared by Technical Committee EH/6, Effects of materials on water quality.Alist of organizations represented on this committee can be obtained on requestto its secretary.SupersessionThis part of BS 6920 supersedes BS 6

9、920-1:2000, which is withdrawn.Relationship with other publicationsThe following parts and sections of BS 6920 have been published. Part 1: Specification; Part 2: Methods of test: Section 2.1: Samples for testing; Section 2.2: Odour and flavour of water; Subsection 2.2.1: General method of test; Sub

10、section 2.2.2: Method of testing odours and flavours imparted to waterby multi-layered hoses and composite pipes and tubes; Subsection 2.2.3: Method of testing odours and flavours imparted to waterby hoses for conveying water for food and drink preparation; Section 2.3: Appearance of water; Section

11、2.4: Growth of aquatic microorganisms test; Section 2.5: The extraction of substances that may be of concern to publichealth; Section 2.6: The extraction of metals; Part 3: High temperature tests; Part 4: Method for the GCMS identification of water leachable organicsubstances.A diagram showing the r

12、elationship of the various parts and sections of thisstandard is given in Annex A.Information about this documentThis is a full revision of the standard, and introduces the following principalchanges. A statement has been added to the scope that this part of BS 6920 is notapplicable to metallic mate

13、rials and products; The definition of the term “product” has been revised (see 3.3); The pass/fail requirements of the odour and flavour of water test have beenclarified (see Clause 4), and supporting flow diagrams given in a newAnnex B; Interpretation of the results of the growth of aquatic microor

14、ganisms testhave been clarified (see Clause 6); The fact that some cold water testing is required before high temperaturetests are carried out has been clarified (see Clause 9).BRITISH STANDARDBS 6920-1:2014ii The British Standards Institution 2014Text and figures introduced or altered by Corrigendu

15、m No. 1 are indicated inthe text by tags. Minor editorial changes are not tagged.Hazard warningsWARNING. This British Standard calls for the use of substances and/orprocedures that can be injurious to health if adequate precautions are nottaken.This British Standard refers only to technical suitabil

16、ity and does not absolvethe user from legal obligations relating to health and safety at any stage.Use of this documentIt has been assumed in the preparation of this part of BS 6920 that theexecution of its provisions will be entrusted to appropriately qualified andexperienced people, for whose use

17、it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informative material is presented insmaller italic

18、 type, and does not constitute a normative element.Requirements in this standard are drafted in accordance with Rules for thestructure and drafting of UK standards, subclause J.1.1, which states,“Requirements should be expressed using wording such as: When tested asdescribed in Annex A, the product

19、shall .”. This means that only those productsthat are capable of passing the specified test will be deemed to conform to thisstandard.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct appl

20、ication.Compliance with a British Standard cannot confer immunity from legalobligations.However, BS 6920-1 is an appropriate British Standard for conformity toRegulation 4 of the Water Supply (Water Fittings) Regulations 1999 (asamended) 5, and for conformity to part of Regulation 31 of the Water Su

21、pply(Water Quality) Regulations 2000 (as amended) 1.BRITISH STANDARD BS 6920-1:2014 The British Standards Institution 2014 iiiBRITISH STANDARDBS 6920-1:2014This page deliberately left blankiv The British Standards Institution 20141 ScopeThis part of BS 6920 specifies requirements for the suitability

22、 of non-metallic(including cementitious) materials and products, and also water fittings andcomponents, pipes and materials used in coating, protection, lining, jointing,sealing and lubrication, for use in contact with either hot or cold waterintended for human consumption, with regard to their effe

23、ct on the quality ofthe water.This standard is not applicable to metallic materials and products.NOTE Under the requirements ofa) Regulation 31 of the Water Supply (Water Quality) Regulations 2000. StatutoryInstrument 2000, No. 3184 (England) 1;b) Regulation 31 of the Water Supply (Water Quality) Re

24、gulations 2010. WelshStatutory Instrument 2010, No. 994 (W.99) 2;c) Regulation 27 of the Water Supply (Water Quality)(Scotland) Regulations 2001.Scottish Statutory Instrument 2001, No. 207 3;d) Regulation 30 of the Water Supply (Water Quality)(Amendment) Regulations(Northern Ireland) 2009. Statutory

25、 Rules of Northern Ireland 2009, No. 246 4 ;e) Clause 2, Schedule 2 of the Water Supply (Water Fittings) Regulations 1999.Statutory Instrument 1999, No. 1148 (England and Wales) 5 ;f) Clause 2, Schedule 2 of the Scottish Water Byelaws 2004 6;g) Clause 2, Schedule 2 of the Water Supply (Water Fitting

26、s) Regulations (NorthernIreland) 2009. Statutory Rules of Northern Ireland 2009, No. 255 7;in some cases national authorities or regulators might require specific additionaltesting to be carried out on extracts from certain types of these materials;interpretation of the results from additional testi

27、ng is the responsibility of therequesting body.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references, onlythe edition cited applies. For undated references, the latest edition of

28、thereferenced document (including any amendments) applies.BS 6920-2.2.1, Suitability of non-metallic products for use in contact with waterintended for human consumption with regard to their effect on the quality ofthe water Part 2: Methods of test Section 2.2: Odour and flavour of water Subsection

29、2.2.1: General method of testBS 6920-2.2.2, Suitability of non-metallic products for use in contact with waterintended for human consumption with regard to their effect on the quality ofthe water Part 2: Methods of test Section 2.2: Odour and flavour of water Subsection 2.2.2: Method of testing odou

30、rs and flavours imparted to water bymulti-layered hoses, pipes and tubesBS 6920-2.2.3, Suitability of non-metallic products for use in contact with waterintended for human consumption with regard to their effect on the quality ofthe water Part 2: Methods of test Section 2.2: Odour and flavour of wat

31、er Subsection 2.2.3: Method of testing odours and flavours imparted to water byhoses for conveying water for food and drink preparationBS 6920-2.3, Suitability of non-metallic products for use in contact with waterintended for human consumption with regard to their effect on the quality ofthe water

32、Part 2: Methods of test Section 2.3: Appearance of waterBRITISH STANDARD BS 6920-1:2014 The British Standards Institution 2014 1BS 6920-2.4, Suitability of non-metallic products for use in contact with waterintended for human consumption with regard to their effect on the quality ofthe water Part 2:

33、 Methods of test Section 2.4: Growth of aquaticmicroorganisms testBS 6920-2.5, Suitability of non-metallic products for use in contact with waterintended for human consumption with regard to their effect on the quality ofthe water Part 2: Methods of test Section 2.5: The extraction of substancesthat

34、 may be of concern to public healthBS 6920-2.6, Suitability of non-metallic products for use in contact with waterintended for human consumption with regard to their effect on the quality ofthe water Part 2: Methods of test Section 2.6: The extraction of metalsBS 6920-3, Suitability of non-metallic

35、products for use in contact with waterintended for human consumption with regard to their effect on the quality ofthe water Part 3: High temperature tests3 Terms and definitionsFor the purposes of this part of BS 6920, the following terms and definitionsapply.3.1 water fittingcomponent associated wi

36、th supply, distribution, and use of water, apart from itsdisposal3.2 materialprepared form of a substance, or of a combination of substances, organic and/ormineral, suitable for use in a manufacturing process3.3 productall or a component part of a manufactured item, in its finished form, that comesi

37、nto contact with water4 Odour and flavour of waterCOMMENTARY ON CLAUSE 4The most common consumer complaints concerning the wholesomeness of waterintended for human consumption is the presence of unacceptable taste. The role ofconstruction and plumbing materials in giving rise to certain types of tas

38、te in wateris well documented. Although the assessment of odours and flavours is subjective,semi-quantitative methods of assessing odours and flavours in water have been usedby the water industry for operational control and quality monitoring purposes formany years. The EC Directive relating to the

39、quality of water intended for humanconsumption (98/83/EC) 8 states that odour and taste of water shall be “acceptableto consumers and no abnormal change” (sic).4.1 Products and materials other than multi-layered hoses, pipesand tubesWhen the material or product is tested in accordance with BS 6920-2

40、.2.1, theodour and flavour of the water shall meet the following requirements:a) at least two of the three test panellists shall report that there is nodiscernible odour in the test extracts and no discernible flavour in the firstdilutions of both the final unchlorinated and final chlorinated extrac

41、ts; andb) none of the panellists shall report any flavour in the second dilutions ofthese extracts.BRITISH STANDARDBS 6920-1:20142 The British Standards Institution 2014If the results from the first extracts conform to these requirements, the firstextracts shall be taken as the final extracts.If two

42、 or more panellists report a flavour in the first dilution of these extracts,but not in the second dilution, repeat tests shall be carried out on two furthersamples of the material or product using both test water types. If the resultsfrom both samples using both water types meet the requirements gi

43、ven in a)and b) the material or product shall be deemed to conform to the standard.If any results for the two additional samples do not meet the requirementsgiven in a) and b) the material or product shall be deemed not to conform tothe standard.NOTE 1 These requirements are set out diagrammatically

44、 in Annex B.NOTE 2 The method yields results for the first and the final extracts in a sequentialseries of seven extractions.4.2 Multi-layered hoses, pipes and tubesWhen multi-layered hoses, pipes or tubes are tested in accordance withBS 6920-2.2.2, the odour and flavour of the water shall meet the

45、requirementsspecified in 4.1 a) and b). Hoses intended for conveying water for food anddrink preparation shall meet the additional requirements specified in Clause 10.Repeat testing, if required, shall be carried out in accordance with 4.1.5 Appearance of waterWhen the material or product is tested

46、in accordance with BS 6920-2.3,anyincrease inthe colour and turbidity of the water shall meet the followingrequirements:a) the colour of the water in the final extract shall be not more than 5 mg/L Ptand;b) the turbidity of the water in the final extract shall benotmorethan 0.5 formazine nephelometr

47、ic units (FNU).If a single sample does not meet the requirements given in a) and b) repeattests shall be carried out on two further samples. If the meanincrease incolour of the final extracts of all the samples is not more than 5mg/L Pt and themean increase inturbidity is not more than 0.5 formazine

48、 nephelometricunits (FNU), after contact for 9 days (seven extractions), the material or productshall be deemed to conform to this standard. If either of these requirements isnot met, the material or product shall be deemed not to conform to thisstandard.6 Growth of aquatic microorganismsCOMMENTARY

49、ON CLAUSE 6Criteria used to assess the ability of a product to enhance growth of aquaticmicroorganisms have been determined from a review of data obtained from the useof the method described in BS 6920-2.4 during investigations into incidents ofmicrobial contamination of water intended for human consumption over a periodof 20 years.BRITISH STANDARD BS 6920-1:2014 The British Standards Institution 2014 3When samples drawn from more than one commercial batch of a product arecompa