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Twinning Poland Metallic Materials 22.04.20091 Acceptance Criteria for Metallic Materials in Contact with Drinking Water Thomas Rapp Section II 3.4 Distribution.

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Presentation on theme: "Twinning Poland Metallic Materials 22.04.20091 Acceptance Criteria for Metallic Materials in Contact with Drinking Water Thomas Rapp Section II 3.4 Distribution."— Presentation transcript:

1 Twinning Poland Metallic Materials Acceptance Criteria for Metallic Materials in Contact with Drinking Water Thomas Rapp Section II 3.4 Distribution of Drinking Water

2 Twinning Poland Metallic Materials Metallic Materials in Contact with DW DWD Requirements Testing Acceptance Criteria Composition List Outline:

3 Twinning Poland Metallic Materials Products: made of materials Metallic Materials in Contact with DW

4 Twinning Poland Metallic Materials Pipe-Materials: Metallic Materials in Contact with DW Stainless Steel:Galvanised Steel: Lead: Copper/ Tinned Copper:

5 Twinning Poland Metallic Materials Materials for Components: Brass (Cu-Zn-Pb alloy) Gunmetal (Cu-Sn-Zn-Pb alloy) Metallic Materials in Contact with DW

6 Twinning Poland Metallic Materials Metal Release depends on: Metal Composition and Surface Characteristics Composition of the Drinking Water Design of the Installation Age of the Installation Stagnation Time Metallic Materials in Contact with DW

7 Twinning Poland Metallic Materials Age of Installation:

8 Twinning Poland Metallic Materials DWD Requirements

9 Twinning Poland Metallic Materials Parametric Values: Pb Cu Ni Sb, As, Cd Cr, Hg, Se Al, Fe, Mn, Na Weekly Average DWD Requirements

10 Twinning Poland Metallic Materials Weakly Average Value? No harmonised method available National interpretation required Germany: UBA Sampling Recommandation DWD Requirements

11 Twinning Poland Metallic Materials DWD Requirements

12 Twinning Poland Metallic Materials DWD Requirements

13 Twinning Poland Metallic Materials UBA Sampling Recommandation MonitoringIndividual Investigation Random Daytime Sample (1 L) DWD Requirements Fully Flushed Sample (1 L) (S0) First Liter Stagnation Sample (S1) Second Liter Stagnation Sample (S2) (2h)- 4h Stagnation

14 Twinning Poland Metallic Materials Testing Materials

15 Twinning Poland Metallic Materials Metals release is caused by corrosion: long lasting process depends on water composition Testing

16 Twinning Poland Metallic Materials Test Method: EN Test Waters: prEN Testing

17 Twinning Poland Metallic Materials Test Device:

18 Twinning Poland Metallic Materials

19 Twinning Poland Metallic Materials Test Method: EN Testing 22 Flow periods per day (each 1 or 2 min) Flow rate: 5 l/min Total water flow: 145 l/d Operation time: min. 26 weeks Sampling: 8 samples after 0,5; 0,5; 1; 1; 2; 4; 8 and 16 h stagnation

20 Twinning Poland Metallic Materials Hygienic Fitness Interaction with a local waterGeneral Hygienic Fitness Testing e.g. for copper pipes

21 Twinning Poland Metallic Materials Category of Materials Testing Assessment of General Hygienic Fitness Reference Material Material 3 Test waters acc. to prEN Comperative test with 1 test water

22 Twinning Poland Metallic Materials Testing Test Waters for Reference Materials (prEN ): Assessment of General Hygienic Fitness NrCharacteristicspH[HCO 3 - ] in mmol/l [Cl - ] + [SO 4 2- ] in mmol/l TOC in mg/l 1very hard, neutral water 7,1- 7,5> 5> 3> 1,5 2soft water, weakly acidic 6,7- 7,10,5- 1,3-- 3soft water, alkaline 8,0- 8,40,7- 1,3--

23 Twinning Poland Metallic Materials Testing Products

24 Twinning Poland Metallic Materials Characteristics due to the production: Lead film on surfaces Nickel on inner surfaces of chromium plated products Testing

25 Twinning Poland Metallic Materials Testing

26 Twinning Poland Metallic Materials Acceptance Criteria

27 Twinning Poland Metallic Materials MS proposal: Procedure for the Acceptance of Metallic Materials Used in Contact with Drinking Water (21. Nov 2008) Germany: DIN (in revision) Acceptance Criteria

28 Twinning Poland Metallic Materials Metallic Corrosion Products in the Test Waters: Acceptance Criteria CriteriaAcceptance Level Compliance with DWD parametric values After 3 months (formation of corrosion layers) Acceptable Contribution to DWD parametric values 50% for Composition Elements 90% for Copper

29 Twinning Poland Metallic Materials Examples for Reference Concentrations: Acceptance Criteria ParameterDWD Limit in µg/l Reference Concentration for materials in µg/l Max. Conc. after treatment in µg/l Pb105 5 Ni2010

30 Twinning Poland Metallic Materials

31 Twinning Poland Metallic Materials Composition List

32 Twinning Poland Metallic Materials e.g. Copper-Zinc-Lead-Alloys (Brass) Reference Material Cu: 57,0-59,0%; Zn: Rest; Pb: 1,9-2,1%; ….. Alloy CW617N, CW612N Cu: 57,0-60,0%; Zn: Rest; Pb: 1,6-2,2%; ….. for products up to 10% contact surface Alloy CW614N, CW603N Cu: 57,0-62,0%; Zn: Rest; Pb: 2,5-3,5%; ….. for products up to 1% contact surface Composition List

33 Twinning Poland Metallic Materials Approval / Certification of Products: Products must be made of materials on the CL => Only testing of composition required Only for certain characteristics (nickel layers) further testing of metals release is required Composition List

34 Twinning Poland Metallic Materials Specific German Acceptance Criteria: Use of copper pipes is restricted to certain DW: Composition List pH ≥ 7,4 or (7,0 ≤ pH < 7,4 and TOC ≤ 1,5 g/m³)

35 Twinning Poland Metallic Materials Thank you for your attention! Thomas Rapp


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