Transcript Folie 1

Metallic Materials
Acceptance Criteria for Metallic Materials
in Contact with Drinking Water
Thomas Rapp
Section II 3.4
Distribution of Drinking Water
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Metallic Materials
Outline:
• Metallic Materials in Contact with DW
• DWD Requirements
• Testing
• Acceptance Criteria
• Composition List
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Metallic Materials
Metallic Materials in Contact with DW
Products:
made of materials
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Metallic Materials
Metallic Materials in Contact with DW
Pipe-Materials:
Stainless Steel:
Galvanised Steel:
Copper/ Tinned Copper:
Lead:
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Metallic Materials
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
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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Metallic Materials
Age of Installation:
Kupferkonzentration in der S1-Probe in Berlin (pH 7,3 - 7,7)
6
Mittelwert 10 Wohnungen
[Cu] in mg/l
5
Wohnung 6
4
3
2
1
0
0
6
12
18
24
30
Monate nach Neuinstallation
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DWD Requirements
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DWD Requirements
Parametric Values:
• Pb
Weekly Average
• Cu
• Ni
• Sb, As, Cd
• Cr, Hg, Se
• Al, Fe, Mn, Na
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Metallic Materials
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
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Metallic Materials
DWD Requirements
S ta g n a tio n C u rve (C o p p e r P ip e / B e rlin T a p W a te r)
4 ,0
3 ,5
[C u ] in m g /l
3 ,0
2 ,5
2 ,0
4 h
1 ,5
M (T )
1 ,0
0 ,5
0 ,0
0
2
4
6
8
10
12
14
16
18
S ta g n a tio n T im e in h
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Metallic Materials
DWD Requirements
M ittlere V erw eilzeiten zeiten vo n 78 H au sh alten
V erw eilzeitzeit in m in
250
200
150
100
III/31
I/15
I/7
II/17
II/14
II/16
II/1
III/41
II/23
II/19
V/32
V/36
III/27
III/37
I/20
III/34
III/36
V/33
II/3
I/22
I/4
I/30
II/6
I/16
I/24
0
I/8
50
S erie/H au sh alt
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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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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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Metallic Materials
Testing
Hygienic Fitness
Interaction with a local water
General Hygienic Fitness
e.g. for copper pipes
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Testing
Assessment of General Hygienic Fitness
Category of Materials
Reference Material
3 Test waters acc. to
prEN 15664-2
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Material
Comperative test
with 1 test water
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Testing
Assessment of General Hygienic Fitness
Test Waters for Reference Materials (prEN 15664-2):
Nr Characteristics pH
[HCO3-] [Cl-] +
TOC
in mmol/l [SO42-] in in mg/l
mmol/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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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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Metallic Materials
Acceptance Criteria
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Metallic Materials
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
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DWD Limit
in µg/l
Max. Conc. after
Reference
Concentration treatment
in µg/l
for materials
in µg/l
Pb
10
5
5
Ni
20
10
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Bleiabgabe nach 4h Stagnation - Marienfelde LW,
Oberflächenanteil 10% normiert
60
Messing (3,3% Pb),
Messing (3,3% Pb) mit Säure gewaschen
50
[Pb] in µg/l
Edelstahl
40
30
20
10
Prüfwert
0
0
10
20
30
40
50
60
70
80
90
Versuchsdauer T in Tagen
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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
=> 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 < 7,4 and TOC ≤ 1,5 g/m³)
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Thank you
for your attention!
Thomas Rapp
[email protected]
www.umweltbundesamt.de
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