twinning poland metallic materials 22.04.20091 acceptance criteria for metallic materials in contact...
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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
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• 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:
Metallic Materials in Contact with DW
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)
Metallic Materials in Contact with DW
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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
Metallic Materials in Contact with DW
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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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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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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 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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Characteristics due to the production:
• Lead film on surfaces
• Nickel on inner surfaces of chromium plated products
Testing
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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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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)
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Thank you for your attention!
Thomas [email protected]
www.umweltbundesamt.de