1、October 2013 Translation by DIN-Sprachendienst.English price group 13No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 77.060; 23.040.99!%=Zg“2265568www.din.deDDIN 50930-6Corrosion of metals Corrosion of metallic materials under corrosion load by water inside ofpipes, tanks and apparatus Part 6: Evaluation process and requirements regarding the hygienicsuitability in contact with drinking water,English translation
3、 of DIN 50930-6:2013-10Korrosion der Metalle Korrosion metallener Werkstoffe im Innern von Rohrleitungen, Behltern und Apparatenbei Korrosionsbelastung durch Wsser Teil 6: Bewertungsverfahren und Anforderungen hinsichtlich der hygienischen Eignung inKontakt mit Trinkwasser,Englische bersetzung von D
4、IN 50930-6:2013-10Corrosion des mtaux Corrosion des matriaux mtalliques sous charge corrosive par des eaux lintrieur destuyauteries, rservoirs et appareils Partie 6: Mthodes dvaluation et exigences concernant ladquation hyginique pour lecontact avec leau potable,Traduction anglaise de DIN 50930-6:20
5、13-10SupersedesDIN 50930-6:2001-08www.beuth.deDocument comprises 26 pagesIn case of doubt, the German-language original shall be considered authoritative.02.15 DIN 50930-6:2013-10 2 A comma is used as the decimal marker. Contents Page Foreword . 3 Introduction 4 1 Scope . 5 2 Normative references .
6、5 3 Terms and definitions, symbols and abbreviations 8 3.1 Terms and definitions 8 3.2 Symbols and abbreviations . 8 4 Material and product testing 10 4.1 General . 10 4.2 Coatings . 10 4.3 Soft solders, hard solders and welding additives . 11 5 Material testing 11 5.1 General . 11 5.2 Characterizat
7、ion of materials 12 5.3 Composition of the test specimens 12 5.4 Chemical analysis of the contact water . 13 5.5 Evaluation of the test results . 13 6 Areas of application . 16 6.1 General . 16 6.2 Drinking water quality 17 6.3 Copper . 19 6.4 Copper pipes with internal tin plating 19 6.5 Hot dip ga
8、lvanized ferrous materials 19 6.6 Stainless steel . 20 6.7 Unalloyed and low-alloyed ferrous materials (according to DIN EN 12502-5) . 20 6.8 Lead 20 7 Protective measures . 21 7.1 General . 21 7.2 Method . 21 Annex A (informative) Specification of alloy components and unavoidable impurities in refe
9、rence materials and materials of a category to be tested according to DIN EN 15664-1 . 22 A.1 General . 22 A.2 Requirements for the composition of reference material test specimens . 23 A.2.1 Alloy components . 23 A.2.2 Unavoidable impurities (content 0,02 % mass fraction) 23 A.3 Requirements for th
10、e composition of reference material test specimens when testing a commercial material . 23 A.3.1 Alloy components . 23 A.3.2 Unavoidable impurities (content 0,02 % mass fraction) 23 A.4 Element analyses in the contact water (see 5.4) . 23 A.5 Calculation example . 24 A.5.1 General . 24 A.5.2 Referen
11、ce material 24 A.5.3 Commercial materials 25 Bibliography . 26 DIN 50930-6:2013-10 3 Foreword This document has been prepared by Working Committee NA 062-01-71 AA Korrosion und Korrosionsschutz of the Normenausschuss Materialprfung (NMP) (DIN Standards Committee Materials Testing) in close cooperati
12、on with the Deutscher Verein des Gas- und Wasserfaches e.V (DVGW) (German Technical and Scientific Association for Gas and Water). The changes to metallic materials by corrosion and measures that can be taken to prevent corrosion are covered in the European standards series DIN EN 12502. However, th
13、is series does not deal with the changes in the quality of the drinking water due to contact with metallic materials; thus, DIN 50930-6 will be retained as a national regulation even upon publication of the DIN EN 12502 standard series. As of December 1, 2013, a lower threshold value of 10 g/l for l
14、ead in drinking water came into force in accordance with the Verordnung ber die Qualitt von Wasser fr den menschlichen Gebrauch (German Drinking Water Ordinance of 2001 - TrinkwV 2001). Subclauses 8.7.1, 8.7.2 and 8.7.3 in DIN 50930-6:2001-08 define materials for fittings and pipe connections which
15、can be used without restriction for all drinking waters. These materials were still permitted to be used until the new threshold value for lead in accordance with the German Drinking Water Ordinance (TrinkwV 2001) henceforth to be referred to as the “Drinking Water Ordinance”, took effect on Decembe
16、r 1, 2013. Metallic materials proven to be suitable for hygienic drinking water use can be found on the list issued by the Umweltbundesamt (Federal Environment Agency - UBA), Empfehlung Trinkwasserhygienisch geeignete metallene Werkstoffe (Recommendation on metallic materials hygienically suitable f
17、or contact with drinking water). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN and/or DKE shall not be held responsible for identifying any or all such patent rights. Amendments This standard differs from DIN 50930-6:2001-08
18、 as follows: a) the standard has been editorially revised; b) it has been brought in line with the new Drinking Water Ordinance and the new lead value limit; c) the testing method as in DIN 50931-1 has been replaced by the testing method as in DIN EN 15664-1; d) the assessment method has been expand
19、ed in order to ensure the general hygienic suitability of a metallic material for its use with all drinking waters. Previous editions DIN 50930-6:2001-08 DIN 50930-6:2013-10 4 Introduction Drinking water shall have a microbiological and chemical composition at the tapping point which cannot cause da
20、mage to human health during lifelong consumption and use. The requirements for drinking water quality are legally defined by the Drinking Water Ordinance. Like all foodstuffs, the properties of drinking water change over time, i.e., it can only be used for drinking for a limited time period. In addi
21、tion to microbiological processes, contact with the material which contains the water is also responsible for these changes. Therefore, water which has stagnated for long periods in the drinking water installation or its components, such as pipes or fittings, should in general not be used for drinki
22、ng and preparing food. The changes in drinking water quality resulting from the interaction between the material and the water are considered corrosion damage when the drinking water quality no longer meets the requirements of the Drinking Water Ordinance. This type of damage, which consists of the
23、introduction of solid or dissolved corrosion products into the drinking water or causes the formation of reaction products with dissolved matter, can only occur under certain operating conditions. Unlike damage to the component by corrosion, the corrosion phenomenon in the water can generally be inf
24、luenced by changing operating or water parameters so that the drinking water is no longer impaired. Stagnation of the drinking water is a major reason for the change in water quality. The type of change depends on the installation material in interaction with the respective water characteristics. A
25、release of metal into drinking water is generally unavoidable but only has negative effects on human health in very rare cases. In order to assess the metal release into the drinking water, a consumption-dependent, representative sampling is necessary. The sampling for the testing of metallic materi
26、als is specified in DIN EN 15664-1. For sampling at a tapping point in the drinking water installation, the graduated stagnation sampling according to the recommendation of the Umweltbundesamt (Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz (Federal Health Gazette Health Research Heal
27、th Protection 2004 47:pp. 296300) applies. Release of metals into the drinking water can be influenced by the operating temperature. Different release rates and concentrations can therefore occur in warm drinking water than in cold drinking water. Detailed instructions for the proper technical use o
28、f materials in contact with drinking water can be found in the pertinent standards and technical rules such as DIN EN 806-2, DIN EN 806-4, and DIN EN 12502-1 to DIN EN 12502-5. DIN 50930-6:2013-10 5 1 Scope This document defines hygienic requirements for metallic materials. These requirements are in
29、tended to ensure that the binding specifications of the Drinking Water Ordinance can be complied with when these materials are used for products in contact with drinking water (e.g. pipes, pipe connections, fittings, water meters, appliances). The evaluation of the results of testing a material in a
30、ccordance with DIN EN 15664-1 and DIN EN 15664-2 described in this document enables the hygienic suitability of a metallic material to be determined, either with a local drinking water or with all drinking waters. Certain pipe materials cannot be used in all drinking waters or under all operating co
31、nditions. The additional requirements for the restricted use of pipe materials with drinking water of a certain quality are also part of this standard. The assessment of materials according to this standard is limited to installations for cold drinking water. However, the materials receiving positiv
32、e evaluations can also be used with drinking water which has been heated, as long as the limitations outlined in Clause 6 are taken into consideration. Protective measures for existing drinking water installations whose operating conditions or age could result in the parameters being exceeded are de
33、scribed in Clause 7. If the legal requirements for drinking water quality cannot be met in existing installation systems as a result of unfavourable water compositions and operating conditions or improper choice of materials, the impermissible changes in the drinking water quality can be counteracte
34、d by protective measures. The effectiveness of these measures can be evaluated using the specifications in this standard. Corrosion processes which lead to damage to the component are not covered by this standard. 2 Normative references The following documents, in whole or in part, are normatively r
35、eferenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 2000, Central drinking water supply Guide lines regarding requirem
36、ents for drinking water, planning, construction, operation and maintenance of plants; Technical rule of the DVGW DIN 2001-1, Drinking water supply from small units and non stationary plants Part 1: Small units Guidelines for drinking water, planning, construction, operation and maintenance of plants
37、; Technical rule of the DVGW DIN 4046, Water-supply Terms; DVGW code of practice DIN 19635-100, Dosing systems for drinking water installation Part 100: Requirements for application of chemical dosing systems in accordance with DIN EN 14812 DIN 38404-4, German standard methods for analysing of water
38、, waste water and sludge Physical and Physical-chemical Parameters (Group C) Determination of Temperature (C 4) DIN 38404-10, German standard methods for the examination of water, waste water and sludge Physical and physico-chemical parameters (Group C) Part 10: Calculation of the calcit saturation
39、of water (C 10) DIN 38405-1, German standard methods for the examination of water, waste water and sludge Anions (Group D) Determination of chloride ions (D 1) DIN 50930-6:2013-10 6 DIN 38405-5, German standard methods for the examination of water, waste water and sludge Anions (Group D) Determinati
40、on of sulfate ions (D 5) DIN 38405-9, German standard methods for examination of water, waste water and sludge Anions (Group D) Part 9: Spectrometric determination of nitrate (D 9) DIN 38405-21, German standard methods for the examination of water, waste water and sludge Anions (Group D); Determinat
41、ion of dissolved silicate by spectrometry (D 21) DIN 38406-3, German standard methods for the examination of water, waste water and sludge Cations (Group E) Part 3: Determination of calcium and magnesium, complexometric method (E 3) DIN 38406-13, German standard methods for the examination of water,
42、 waste water and sludge Cations (Group E) Determination of potassium by atomic absorption spectrometry (AAS) using an air-acetylene flame (E 13) DIN 38406-14, German standard methods for the examination of water, waste water and sludge Cations (Group E) Determination of sodium by atomic absorption s
43、pectrometry (AAS) using an air-acetylene flame (E 14) DIN 38409-6, German standard methods for the examination of water, waste water and sludge Summary indices of actions and substances (Group H) Water hardness (H 6) DIN 38409-7, German standard methods for the examination of water, waste water and
44、sludge Parameters characterizing effects and substances (Group H) Part 7: Determination of acid and base-neutralizing capacities (H 7) DIN EN 1057, Copper and copper alloys Seamless, round copper tubes for water and gas in sanitary and heating applications DIN EN 1484, Water analysis Guidelines for
45、the determination of total organic carbon (TOC) and dissolved organic carbon (DOC) DIN EN 1982, Copper and copper alloys Ingots and castings DIN EN 10204, Metallic products Types of inspection documents DIN EN 10240, Internal and/or external protective coatings for steel tubes Specification for hot
46、dip galvanized coatings applied in automatic plants DIN EN 12502-2, Protection of metallic materials against corrosion Guidance on the assessment of corrosion likelihood in water distribution and storage systems Part 2: Influencing factors for copper and copper alloys DIN EN 12502-3, Protection of m
47、etallic materials against corrosion Guidance on the assessment of corrosion likelihood in water distribution and storage systems Part 3: Influencing factors for hot dip galvanized ferrous materials DIN EN 12502-4, Protection of metallic materials against corrosion Guidance on the assessment of corro
48、sion likelihood in water distribution and storage systems Part 4: Influencing factors for stainless steels DIN EN 12502-5, Protection of metallic materials against corrosion Guidance on the assessment of corrosion likelihood in water distribution and storage systems Part 5: Influencing factors for cast iron, unalloyed and low alloyed steels DIN EN 14812, Water conditioning equipment inside buildings Chemical dosing systems Pre-set dosing systems
