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

• Metallic Materials in Contact with DW
• DWD Requirements
• Testing
• Acceptance Criteria
• Composition List

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Metallic Materials in Contact with DW

• Products
• made of materials

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Metallic Materials in Contact with DW

• Pipe-Materials

Stainless Steel
Galvanised Steel
Lead
Copper/ Tinned Copper
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Metallic Materials in Contact with DW

• Materials for Components
• Brass (Cu-Zn-Pb alloy)
• Gunmetal (Cu-Sn-Zn-Pb alloy)

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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

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Age of Installation
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DWD Requirements
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DWD Requirements

• Parametric Values
• Pb
• Cu
• Ni
• Sb, As, Cd
• Cr, Hg, Se
• Al, Fe, Mn, Na

Weekly Average
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DWD Requirements

• Weakly Average Value?
• No harmonised method available
• National interpretation required
• Germany UBA Sampling Recommandation
• http//www.umweltbundesamt.de/wasser-e/themen/down
  loads/drinking-water/UBA-sampling-recommandation.p
  df

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DWD Requirements
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DWD Requirements
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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)
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Testing Materials
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Testing

• Metals release is caused by corrosion
• long lasting process
• depends on water composition

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Testing

• Test Method EN 15664-1
• Test Waters prEN 15664-2

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Test Device
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(No Transcript)
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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
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Testing

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

• Test Waters for Reference Materials (prEN
  15664-2)

Assessment of General Hygienic Fitness
Nr Characteristics pH HCO3- in mmol/l Cl- SO42- in mmol/l TOC in mg/l
1 very hard, neutral water 7,1- 7,5 gt 5 gt 3 gt 1,5
2 soft water, weakly acidic 6,7- 7,1 0,5- 1,3 - -
3 soft water, alkaline 8,0- 8,4 0,7- 1,3 - -
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Testing Products
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Testing

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

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Testing

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Acceptance Criteria
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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)

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Acceptance Criteria

• Metallic Corrosion Products in the Test Waters

Criteria Acceptance 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
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Acceptance Criteria

• Examples for Reference Concentrations

Parameter DWD Limit in µg/l Reference Concentration for materials in µg/l Max. Conc. after treatment in µg/l
Pb 10 5 5
Ni 20 10 10
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Composition List
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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

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Composition List

• Approval / Certification of Products
• Products must be made of materials on the CL
• gt Only testing of composition required
• Only for certain characteristics (nickel layers)
  further testing of metals release is required

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Composition List

• Specific German Acceptance Criteria
• Use of copper pipes is restricted to certain DW

pH 7,4 or (7,0 pH lt 7,4 and TOC 1,5
g/m³)
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Thank you for your attention!Thomas
RappThomas.Rapp_at_uba.de www.umweltbundesamt.de