1、BSI Standards PublicationBS 6920-2.1:2014Suitability of non-metallicmaterials and products foruse in contact with waterintended for humanconsumption with regard totheir effect on the quality ofthe waterPart 2: Methods of test Section 2.1:Samples for testingPublishing and copyright informationThe BSI
2、 copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2014Published by BSI Standards Limited 2014ISBN 978 0 580 83817 0ICS 13.060.20The following BSI references relate to the work on this document:Committee reference EH/6Draft for
3、comment 13/30287567 DCPublication historyFirst published 31 May 1988Second edition, 29 June 1990Third edition, 15 December 1996Fourth edition, 15 May 2000Fifth (present) edition, 30 June 2014Amendments issued since publicationDate Text affectedBS 6920-2.1:2014 BRITISH STANDARDContentsForeword ii1 Sc
4、ope 12 Normative references 13 Terms and definitions 24 Apparatus 45 Procedure 56 Factory made products 67 Site-applied materials and products 138 Sample description 199 Reporting 19Bibliography 22List of figuresFigure 1 The radius of the largest sphere that will fit in the thickest section ofa rubb
5、er based test material or product 3List of tablesTable1Testcontainer calibration mark 5Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 22, an inside back cover and a back cover.BRITISH STANDARD BS 6920-2.1:2014 The British Standards Institution
6、2014 iForewordPublishing informationThis part of BS 6920 is published by BSI Standards Limited, under licence fromThe 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 represen
7、ted on this committee can be obtained on requestto its secretary.SupersessionThis part of BS 6920 supersedes BS 6920-2.1:2000+A3:2008, which is withdrawn.Relationship with other publicationsThe following parts and sections of BS 6920 have been published. Part 1: Specification; Part 2: Methods of tes
8、t; Section 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 impartedto water by multi-layered hoses and composite pipes and tubes; Subsection 2.2.3: Method of testing odours and flavou
9、rs impartedto water by hoses for conveying water for food and drinkpreparation; Section 2.3: Appearance of water; Section 2.4: Growth of aquatic microorganisms test; Section 2.5: The extraction of substances that may be of concern topublic health; Section 2.6: The extraction of metals; Part 3: High
10、temperature tests; Part 4: Method for the GCMS identification of water leachable organicsubstances.Information about this documentThis is a full revision of the standard, and introduces the following principalchanges: New definitions for the terms multi-layered product (see 3.2), inradius (3.5),ther
11、moplastic material (3.6), thermosetting material (3.7), cure (3.8), solventcement (3.10) and porous seal coat (3.11) have been provided. The specification of metal couplings has been changed (see 4.2.2). A new requirement for porous seal coats has been added (see 6.13.2). New requirements for in-sit
12、u applied pipe linings and coatings (see 7.2),resin anchors (7.7) and solvent cements (7.8) have been added. Reporting requirements have been amended (see Clause 9).BRITISH STANDARDBS 6920-2.1:2014ii The British Standards Institution 2014Hazard warningsWARNING. This British Standard calls for the us
13、e of substances and/orprocedures that can be injurious to health if adequate precautions are nottaken. It refers only to technical suitability and does not absolve the userfrom legal obligations relating to health and safety at any stage.Use of this documentIt has been assumed in the preparation of
14、this part of BS 6920 that theexecution of its provisions will be entrusted to appropriately qualified andexperienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsmethods are expressed as a set of i
15、nstructions, a description, or in sentences inwhich the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport t
16、o include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 6920-2.1:2014 The British Standards Institution 2014 iiiBRITISH STANDARDBS 6920-2.1:2014iv The Br
17、itish Standards Institution 20141 ScopeThis section of BS 6920 describes the preparation of test samples of all types ofnon-metallic (including cementitious) materials and products, including waterfittings and components, pipes and materials used in coating, protection, lining,jointing, sealing and
18、lubrication, for their suitability for use in contact withwater intended for human consumption, with regard to their effect on thequality of the water.This standard does not cover metallic materials and products, unless they will beused in conjunction with a non-metallic material, e.g. coating.NOTE
19、Under the relevant National Regulations 1 to 7 , the National Regulatormay specify additional provisions in some cases and will assess the significance of theresults obtained.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indisp
20、ensable for its application. For dated references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS 864-2, Capillary and compression tube fittings of copper and copper alloy Part 2: Specification for capillary a
21、nd compression fittings for copper tubesBS 887:1982, Specification for precision vernier callipersBS 4372:1968, Specification for engineers steel measuring rulesBS 6920-1:2014, Suitability of non-metallic products for use in contact with waterintended for human consumption with regard to their effec
22、t on the quality ofthe water Part 1: SpecificationBS 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: M
23、ethod of testing odours and flavours imparted to water bymulti-layered hoses and composite 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 Sec
24、tion 2.2: Odour and flavour of water 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
25、effect on the quality ofthe water Part 2: Methods of test Section 2.3: Appearance of waterBS 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: Methods of test Section 2.4: Growth o
26、f 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 may be of concern to public healthBS
27、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 metalsBRITISH STANDARD BS 6920-2.1:2014 The British Standards Institution 2014 1BS
28、6920-3, 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 3: High temperature testsBS EN 197-1, Cement Part 1: Composition, specifications and conformity criteriafor common cementsBS EN 1057, C
29、opper and copper alloys Seamless, round copper tubes for waterand gas in sanitary and heating applicationsBS EN 1992-3, Eurocode 2 Design of concrete structures Part 3: Liquidretaining and containing structuresBS EN 12620, Aggregates for concreteBS EN 30012-1, Quality assurance requirements for meas
30、uring equipment Part 1: Metrological confirmation system for measuring equipmentBS EN ISO 2808 (BS 3900-C5), Paints and varnishes Determination of filmthicknessBS EN ISO 3696, Water for analytical laboratory use Specification and testmethodsBS EN ISO 10523:2012, Water quality Determination of pHBS I
31、SO 2230, Rubber products Guidelines for storage3 Terms and definitionsFor the purposes of this part of BS 6920, the following terms and definitionsapply.3.1 materialprepared form of a substance, or of a combination of substances, suitable foruse in a manufacturing process; it can be organic or miner
32、al3.2 multi-layered productproduct whose water-contact surface is made from a material that differs fromthose comprising the remainder of the product3.3 productall or a component part of a manufactured item, in its finished form, that comesinto contact with water3.4 test samplesample of the material
33、, product, or part of a product, submitted to the testprocedureNOTE In some cases the sample might consist of more than one example (test pieceor article) of the product.3.5 inradiusthe radius of the largest sphere that will fit in the thickest section of a rubberbased test material or product (see
34、Figure 1)BRITISH STANDARDBS 6920-2.1:20142 The British Standards Institution 2014Figure 1 The radius of the largest sphere that will fit in the thickest section of a rubber based testmaterial or producta) Inradius of an o-ring b) Inradius of a cubeNOTE The cross sectional thickness of the thickest s
35、ection of a test sample = 2 x inradius.Solid shape Solid shapeWhere s is the side lengthTetrahedron 612sCube 12sOctahedron 66s3.6 thermoplastic materialpolymeric organic material that becomes pliable and mouldable above a specifictemperature, but returns to a solid state upon coolingNOTE Examples in
36、clude ABS, PVC, nylon, polyethylene and acetal (POM).3.7 thermosetting materialpolymeric organic material that once formed into its final manufactured(irreversibly cured see 3.8) state is infusible and insolubleNOTE Examples include most rubber materials used in contact with water, togetherwith phen
37、olic resins, some polyurethanes and epoxy resins.3.8 curecuring in relation to materials refers to the change (usually irreversible) in boththe chemistry and physical properties of the material. For most materials this canbe as a result of cross-linking of polymer chains (brought about by a chemical
38、reaction), radiation (e.g. UV light and/or heat). For cementitious materials theprocess of cure is different. With the exception of radiation mediated cures, formost materials curing is temperature and duration dependentNOTE Many products that change into their final form suitable for use in contact
39、with water do so by means of solvent loss (organic or water), i.e. drying, not curing,e.g. solvent cements and many one-part coatings. Drying is usually temperature andduration dependent.3.9 anaerobic adhesiveadhesive that cures spontaneously in the absence of oxygen, curing beinginhibited by the pr
40、esence of oxygen and catalyzed by metal ionsBRITISH STANDARD BS 6920-2.1:2014 The British Standards Institution 2014 33.10 solvent cementsolution containing appropriate solvents, that might also contain dissolvedplastics, used to join plastic materials such as ABS, PVC, etc; the cement cures bythe l
41、oss of the solvent(s)3.11 porous seal coatpolymeric materials applied in a thin (25 mto200m thickness) surface layerto a cement mortar lining in order to restrict (but not prevent) interactionsbetween the mortar and water4 Apparatus4.1 Test plates4.1.1 Glass plates, constructed of sand-blasted glass
42、, that has been sand-blastedon all surfaces, and having a total surface area of (15 000 500) mm2. The widthof the plates shall not exceed 60 mm. Soak the plates for 24 hours in 10% nitricacid and thoroughly rinse in tap water. Clean them in an aqueous solution of abiodegradable laboratory detergent.
43、 Rinse thoroughly in tap water and thenonce in distilled water conforming to grade 3 of BS EN ISO 3696. Drain and dryin a hot air cabinet and store in polyethylene bags (4.2.1).4.1.2 Special glass plates, conforming to 4.1.1 except that only one side has beensand-blasted.4.1.3 Stainless steel plates
44、, of the same surface area and dimensions as the glassplates described in 4.1.1. The plates shall be cleaned before use in accordancewith 4.1.1 omitting the soaking in 10% nitric acid.4.2 Other apparatus4.2.1 Polyethylene bags, of a type suitable for food contact.Prior to use, the bags shall be stor
45、ed in a closed container. The bags shall not beused for thermosetting rubber compounds (see 6.3).4.2.2 Stainless steel couplings, female/female, 15 mm diameter compressioncouplings.Take the coupling apart and discard the compression “olives”; retain the body ofthe coupling and the two screw collars.
46、 Immerse the couplings in an aqueoussolution of a biodegradable laboratory detergent for 5 min. Rinse the couplingswith distilled water conforming to grade 3 of BS EN ISO 3696, and then immersein a 1% by volume solution of nitric acid for 1 min. Rinse in tap water and thenin distilled water again. D
47、rain and dry in a hot air cabinet and store inpolyethylene bags (4.2.1).NOTE Some anaerobic adhesives do not cure adequately on stainless steel. In thiscase advice should be sought from the manufacturer of the adhesive on a suitablemetal to use for the coupling that gives a satisfactory cure and doe
48、s not lead to afailure in the Extraction of Metals test (see BS 6920-2.6).4.2.3 Test container, made of glass, as specified in the appropriate section ofBS 6920, and of size as given in 5.1.2.BRITISH STANDARDBS 6920-2.1:20144 The British Standards Institution 20145 Procedure5.1 General5.1.1 Nature o
49、f samplesThe samples used for testing shall be manufactured products or components ofwater fittings drawn from representative production batches that have receivedno other treatment, except for the exclusions given below.In a very few special applications, e.g. within water undertakings distributionsystems involving products used for joints in service reservoirs, or large tanksconstructed in accordance with BS EN 1992-3, the surface area to volume ratioused for the tests described i
