1 / 35

Metallic Materials in Contact with DW DWD Requirements Testing Acceptance Criteria

Acceptance Criteria for Metallic Materials in Contact with Drinking Water Thomas Rapp Section II 3.4 Distribution of Drinking Water. Outline:. Metallic Materials in Contact with DW DWD Requirements Testing Acceptance Criteria Composition List. Metallic Materials in Contact with DW.

aimee-cobb
Download Presentation

Metallic Materials in Contact with DW DWD Requirements Testing Acceptance Criteria

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Acceptance Criteria for Metallic Materials in Contact with Drinking WaterThomas RappSection II 3.4Distribution of Drinking Water

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

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

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

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

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

  7. Age of Installation:

  8. DWD Requirements

  9. DWD Requirements Parametric Values: • Pb • Cu • Ni • Sb, As, Cd • Cr, Hg, Se • Al, Fe, Mn, Na Weekly Average

  10. DWD Requirements Weakly Average Value? • No harmonised method available • National interpretation required Germany: UBA Sampling Recommandation http://www.umweltbundesamt.de/wasser-e/themen/downloads/drinking-water/UBA-sampling-recommandation.pdf

  11. DWD Requirements

  12. DWD Requirements

  13. DWD Requirements UBA Sampling Recommandation Monitoring Individual Investigation Fully Flushed Sample (1 L) (S0) Random Daytime Sample (1 L) (2h)- 4h Stagnation First Liter Stagnation Sample (S1) Second Liter Stagnation Sample (S2)

  14. Testing Materials

  15. Testing Metals release is caused by corrosion: • long lasting process • depends on water composition

  16. Testing Test Method: EN 15664-1 Test Waters: prEN 15664-2

  17. Test Device:

  18. Testing Test Method: EN 15664-1 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

  19. Testing Hygienic Fitness Interaction with a local water General Hygienic Fitness e.g. for copper pipes

  20. Testing Category of Materials Assessment of General Hygienic Fitness Reference Material Material 3 Test waters acc. to prEN 15664-2 Comperative test with 1 test water

  21. Testing Test Waters for Reference Materials(prEN 15664-2): Assessment of General Hygienic Fitness

  22. Testing Products

  23. Testing Characteristics due to the production: • Lead film on surfaces • Nickel on inner surfaces of chromium plated products

  24. Testing

  25. Acceptance Criteria

  26. Acceptance Criteria 4 MS proposal: Procedure for the Acceptance of Metallic Materials Used in Contact with Drinking Water (21. Nov 2008) Germany: DIN 50930-6 (in revision)

  27. Acceptance Criteria Metallic Corrosion Products in the Test Waters:

  28. Acceptance Criteria Examples for Reference Concentrations:

  29. Composition List

  30. Composition List 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

  31. Composition List 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

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

  33. Thank you for your attention!Thomas RappThomas.Rapp@uba.dewww.umweltbundesamt.de

More Related