Twinning Poland Metallic Materials 22.04.20091 Acceptance Criteria for Metallic Materials in Contact...

22.04.2009 1 Twinning Poland

Metallic Materials

Acceptance Criteria for Metallic Materials in Contact with Drinking Water

Thomas Rapp

Section II 3.4Distribution of Drinking Water


Metallic Materials

• Metallic Materials in Contact with DW

• DWD Requirements

• Testing

• Acceptance Criteria

• Composition List

Outline:


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Products:

made of materials

Metallic Materials in Contact with DW


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Pipe-Materials:


Stainless Steel: Galvanised Steel:

Lead:Copper/ Tinned Copper:


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Materials for Components:

• Brass (Cu-Zn-Pb alloy)

• Gunmetal (Cu-Sn-Zn-Pb alloy)



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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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Kupferkonzentration in der S1-Probe in Berlin (pH 7,3 - 7,7)

0

1

2

3

4

5

6

0 6 12 18 24 30

Monate nach Neuinstallation

[Cu

] in

mg

/l

Mittelwert 10 Wohnungen

Wohnung 6

Age of Installation:


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DWD Requirements


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Parametric Values:

• Pb

• Cu

• Ni

• Sb, As, Cd• Cr, Hg, Se

• Al, Fe, Mn, Na

Weekly Average

DWD Requirements


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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

DWD Requirements


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DWD RequirementsStagnation Curve (Copper Pipe / Berlin Tap Water)

0,0

0,5

1,0

1,5

2,0

2,5

3,0

3,5

4,0

0 2 4 6 8 10 12 14 16 18

Stagnation Time in h

[Cu

] in

mg

/l

M(T)4 h


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DWD RequirementsMittlere Verweilzeitenzeiten von 78 Haushalten

0

50

100

150

200

250

I/8 I/24

I/16

II/6

I/30 I/4 I/22

II/3

V/3

3

III/3

6

III/3

4

I/20

III/3

7

III/2

7

V/3

6

V/3

2

II/19

II/23

III/4

1

II/1

II/16

II/14

II/17 I/7 I/15

III/3

1

Serie/Haushalt

Ver

wei

lzei

tzei

t in

min


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UBA Sampling Recommandation

Monitoring Individual 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


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Testing

Materials


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Metals release is caused by corrosion:

• long lasting process

• depends on water composition

Testing


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Test Method: EN 15664-1

Test Waters: prEN 15664-2

Testing


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Test Device:


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Test Method: EN 15664-1

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


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Hygienic Fitness

Interaction with a local water General Hygienic Fitness

Testing

e.g. for copper pipes


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Category of Materials

Testing

Assessment of General Hygienic Fitness

Reference Material

Material3 Test waters acc. to

prEN 15664-2Comperative 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-] + [SO4

2-] in mmol/l

TOC in mg/l

1 very hard, neutral water

7,1- 7,5 > 5 > 3 > 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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Characteristics due to the production:

• Lead film on surfaces

• Nickel on inner surfaces of chromium plated products

Testing


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Testing


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Acceptance Criteria


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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)

Acceptance Criteria


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Metallic Corrosion Products in the Test Waters:

Acceptance Criteria

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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Examples for Reference Concentrations:

Acceptance Criteria

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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Bleiabgabe nach 4h Stagnation - Marienfelde LW, Oberflächenanteil 10% normiert

0

10

20

30

40

50

60

0 10 20 30 40 50 60 70 80 90

Versuchsdauer T in Tagen

[Pb

] in

µg

/l

Messing (3,3% Pb),

Messing (3,3% Pb) mit Säure gewaschen

Edelstahl

Prüfwert


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Composition List


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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


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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


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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)


Metallic Materials

Thank you for your attention!

Thomas [email protected]

www.umweltbundesamt.de

Twinning Poland Metallic Materials 22.04.20091 Acceptance Criteria for Metallic Materials in Contact...

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