1、ICS 23.040.10Umhllung von Rohren aus duktilem Gusseisen Teil 3: Zinkberzug mit DeckbeschichtungIn keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal marker.ContentsPageRef. No. DIN 30674-3 :
2、 2001-03English price group 05 Sales No. 010504.03DEUTSCHE NORM March 200130674-3Continued on pages 2 to 5. No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right o
3、f sale for German Standards (DIN-Normen).Coating of ductile cast iron pipesPart 3: Zinc coating with a protective finishing layerTranslation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.This standard supersedesDIN 30674-4, May 198
4、3edition, and, together withDIN EN 545, January 1995edition, DIN EN 969,November 1995 edition,supersedes DIN 30674-3,September 1982 edition.Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Scope . . . . . . . . . . . . . . . .
5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6、34 Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.1 Pipe surface . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7、 . . . . . . . . . . . . . . . . . . . . 35.2 Zinc coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2.1 Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2.2 Mass and thickness .
8、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.3 Finishing layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.3.1 Substrate (zinc-coated surface) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.
9、3.2 Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.3.3 Thickness and hygiene . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10、 . . . . . . . . . . . . . . . . . . . 46.1 Pipe surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.2 Zinc coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.2.1 Zinc composition . . . . .
11、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.2.2 Mass and appearance of zinc coating . . . . . . . . . . . . . . . . . . . . . . . . . . 46.3 Finishing layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.3.1 Substrat
12、e (zinc-coated surface) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.3.2 Quality of coating material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.3.3 Thickness and hygiene . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 S
13、cope of testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Page 2DIN 30674-3 : 2001-03ForewordThis standard has been jointly prepared
14、 by the Normenausschuss Gastechnik (Gas Technology StandardsCommittee) and the DVGW Deutsche Vereinigung des Gas- und Wasserfaches e.V. (German Association of Gasand Water Engineers). The standard has been adopted as a DVGW Code of practice.DIN EN 545, DIN EN 598 and DIN EN 969 require that ductile
15、cast iron pipes be provided with a zinc coatingand a protective finishing layer, unless manufacturer and customer agree otherwise. These standards providegeneral information and describe the essential characteristics of the zinc coating and the finishing layer.The manufacturers instructions should b
16、e followed for installing and using pipes conforming to this standard.AmendmentsThis standard differs from the September 1982 edition of DIN 30674-3 and the May 1983 edition of DIN 30674-4in that it reflects recent technical developments and takes DIN EN 545, DIN EN 598 and DIN EN 969 intoconsiderat
17、ion, and that requirements for bituminous finishing layers have been included.Previous editionsDIN 30674-3: 1982-09; DIN 30674-4: 1983-05.1 ScopeThis standard sets out material specifications, requirements, test methods and the scope of testing for zinccoatings with a protective finishing layer on d
18、uctile cast iron pipes.2 Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. These norma-tive references are cited at the appropriate places in the text, and the titles of the publications are listed below.For dated references, subsequen
19、t amendments to or revisions of any of these publications apply to thisstandard only when incorporated in it by amendment or revision. For undated references, the latest edition ofthe publication referred to applies.DIN 50902 Protective coatings on metals Concepts, application methods and surface pr
20、eparationDIN 52005 Bitumen and coal tar pitch Determination of ashDIN 53150 Determination of through-dry state of paints and varnishes (modified Bandow-Wolffmethod)DIN 53213-1 Determination of the flashpoint of paints and varnishes and similar solvent-borne productsby the closed cup methodDIN 53215
21、Determining the non-volatile matter content of bituminous coating materialsDIN EN 545 Ductile iron pipes, fittings, accessories and their joints for water pipelines Requirementsand test methodsDIN EN 598 Ductile iron pipes, fittings, accessories and their joints for sewerage application Require-ment
22、s and test methodsDIN EN 969 Ductile iron pipes, fittings, accessories and their joints for gas pipelines Requirements andtest methodsDIN EN 1179 Zinc and zinc alloys Primary zincDIN EN 1426 Bitumen and bituminous binders Determination of needle penetrationDIN EN 1427 Bitumen and bituminous binders
23、Determination of softening point Ring and ball methodDIN EN 10204 Inspection documents for metallic products (includes Amendment A1 : 1995)DIN EN ISO 3251 Paints and varnishes Determination of non-volatile matter of paints, varnishes and bindersfor paints and varnishes (ISO 3251 : 1993)DVGW-Arbeitsb
24、latt W 270 (DVGW Code of practice) Vermehrung von Mikroorganismen auf Werkstoffen frden Trinkwasserbereich Prfung und Bewertung (Microbial growth on materials in contact with drinkingwater Testing and evaluation)*)KTW-Empfehlungen (KTW Recommendations) Gesundheitliche Beurteilung von Kunststoffen un
25、d anderennichtmetallischen Werkstoffen im Rahmen des Lebensmittel- und Bedarfsgegenstndegesetzes fr den Trink-wasserbereich (Assessment of the standard of hygiene of plastics and other non-metallic materials accordingto the terms of the German Federal Foodstuffs Act as applied to drinking water), Bu
26、ndesgesundheitsblatt(German Federal Health Gazette), 1977: 20 (1), pp. 10 ff.*) Obtainable from Wirtschafts- und Verlagsgesellschaft Gas und Wasser mbH, Josef-Wirmer-Strasse 3,53123 Bonn.Page 3DIN 30674-3 : 2001-033 ConceptsIn addition to the concepts as in DIN 50902, the following apply.3.1 Zinc co
27、ating massThe mass of zinc applied to the pipe surface per unit area.3.2 Finishing layerBituminous or synthetic resin coating applied to the surface of zinc-coated metal.4 DesignationDesignation of a zinc coating with a protective finishing layer in accordance with this standard:Coating DIN 30674-35
28、 Requirements5.1 Pipe surfaceThe pipe surface shall fulfil the requirements set out in DIN EN 545, DIN EN 598 and DIN EN 969.5.2 Zinc coating5.2.1 MaterialPrimary zinc of class Z1 or Z2 as in DIN EN 1179 with a nominal zinc content of 99,99 % or 99,995 % shall beused for the coating.5.2.2 Mass and t
29、hicknessThe mean zinc coating mass per unit area shall be in accordance with DIN EN 545, DIN EN 598 and DIN EN 969.The zinc coating shall be uniformly thick throughout, except at the socket face, and shall be free of flaws. Anyuncoated spots shall be repaired as specified in DIN EN 545, DIN EN 598 a
30、nd DIN EN 969.5.3 Finishing layer5.3.1 Substrate (zinc-coated surface)The zinc-coated surface shall be free of dirt, oil, grease and moisture.5.3.2 MaterialMaterial for the finishing layer shall be compatible with zinc and shall not affect the anti-corrosive propertiesof the coating system. It shall
31、 be capable of being applied by airless spraying.5.3.2.1 Bituminous materialsBituminous coating material shall meet the requirements given in table 1.Table 1: Bituminous materialsProperty Requirements Testing as inSoftening point of total solids1) Over 100 C DIN EN 1427Needle penetration of totalLes
32、s than 10 mm DIN EN 1426solids at 25 C1)Flash point Over 21 C DIN 53213-1Drying time to grade 2 dryness Less than 2 h DIN 53150Solids content Over 65 % by mass DIN 53215Ash and extender content 40 % to 50 % by mass DIN 520051) Total solids as in DIN 53215.Page 4DIN 30674-3 : 2001-035.3.2.2 Synthetic
33、 resin varnishesSynthetic resin varnishes such as those made from cyclized rubber or epoxy resin shall fulfil the requirementsset out in table 2.Table 2: Synthetic resin varnishesProperty Requirement Testing as inFlash point Over 21 C DIN 53213-1Drying time to grade 2 dryness Less than 2 h DIN 53150
34、Solids content of single-componentOver 65 % by mass DIN EN ISO 3251varnishesSolids content of two-componentOver 75 % by mass DIN EN ISO 3251varnishes5.3.3 Thickness and hygiene5.3.3.1 ThicknessThe thickness and uniformity of the finishing layer shall fulfil the requirements set out in DIN EN 545, DI
35、N EN 598and DIN EN 969.5.3.3.2 HygieneIf the finishing layer is to come into contact with drinking water, it shall meet the stipulations of the relevant KTW-Empfehlungen and the DVGW-Arbeitsblatt W 270.6 Testing6.1 Pipe surfaceThe pipe surface shall be checked visually for cleanness.6.2 Zinc coating
36、6.2.1 Zinc compositionIf requested, the supplier shall provide proof of conformity of the zinc composition with DIN EN 1179.6.2.2 Mass and appearance of zinc coatingThe mean zinc mass per unit area shall be determined gravimetrically as in DIN EN 545, DIN EN 598 orDIN EN 969, by establishing the mas
37、s of a test piece before and after applying the zinc coating. Alternatively,the zinc mass per unit area may be directly determined on the pipe using another method, such as X-rayfluorescent analysis or chemical analysis. In arbitration cases, quantitative chemical analysis shall be used.The zinc coa
38、ting shall be checked visually for uniformity.6.3 Finishing layer6.3.1 Substrate (zinc-coated surface)The zinc-coated pipe surface shall be checked visually for cleanness.6.3.2 Quality of coating materialAn airless spraying test shall be carried out using the coating material in its as delivered con
39、dition and withoutfurther thinning at (23 t 3)C to determine whether the extender is sufficiently fine-grained.In the case of bituminous coating materials and synthetic resin varnishes, testing shall be carried out using themethods referred to in tables 1 and 2.6.3.3 Thickness and hygiene6.3.3.1 Thi
40、cknessThe dry film thickness shall be determined as in DIN EN 545, DIN EN 598 and DIN EN 969. Testing may becarried out directly on the pipe or using a test piece. The finishing layer shall be checked visually for uniformity.6.3.3.2 HygieneTesting for establishing whether the finishing layer conform
41、s to the stipulations of the relevant KTW-Empfehlungen shall be carried out by an authorized body, using pipe sections or test pieces.Page 5DIN 30674-3 : 2001-037 Scope of testingThe scope of testing during production shall be as in in table 3. By agreement, the manufacturer shall issue aDIN EN 1020
42、4 inspection document covering the results of testing.Table 3: Requirements, scope of testing and testingProperty/item testedSeeScope of testingTesting assubclause in subclausePipe surface 5.1 During production, by manufacturer. 6.1Material 5.2.1 At customers request, but at least 6.2.1once a year.M
43、ass and thickness 5.2.2 Twice a month, by manufacturer; 6.2.2at least two pipes of different nominalsize per production unit.Uniformity of zinc coating 5.2.2 During production, by manufacturer. 6.2.2Suitability of coating material 5.3.1 Proof to be provided by supplier on 6.3.1request.Quality of coa
44、ting material 5.3.2 Proof to be provided by supplier on 6.3.2request.Thickness and uniformity of coating 5.3.3.1 During production by the 6.3.3.1manufacturer.Hygiene 5.3.3.2 Proof to be provided by supplier 6.3.3.2every five years8 MarkingPipes conforming to this standard shall be marked as in DIN EN 545, DIN EN 598 or DIN EN 969.EXAMPLE: DIN EN 545.
