Table des Matières
Publicité
Les langues disponibles
Les langues disponibles
3.4
Corrosion protection
To prevent corrosion damage to plate heat exchangers, the following drinking water values
must be observed:
1
-
Chloride
(CL
)
1
2-
Sulphate
(SO
)
4
Nitrate (NO
-)
3
pH value
Electrical conductivity (at
20°C)
Hydrogen carbonate
-
(HCO
)
3
-
2-
Ratio HCO
/ SO
3
4
+
Ammonia (NH
)
4
Free chlorine gas
Sulphite
Ammonium
Hydrogen sulphide
(H
S)
2
Free (aggressive)
carbon dioxide (CO
)
2
Iron (Fe)
Saturation index SI
Manganese (Mn)
Degree of hardness
Total organic carbon
(TOC)
1
If the limit values for copper-soldered plate heat exchangers are exceeded, a solid stainless
steel plate heat exchanger must be used.
To prevent pitting corrosion in the domestic installation, no new galvanised iron material must
be installed downstream in the hot water pipe of the copper-soldered plate heat exchanger
without forming a protective layer.
Solid stainless steel plate heat exchangers must be used in mixed installations with zinc-
coated iron materials (available on request).
908.19.08.00
Last updated 2022/03/15
Copper-soldered
< 100 mg/l
< 100 mg/l
7.5 - 9.0
10 - 500 µS/cm
70 - 300 mg/l
> 1
< 2 mg/l
< 1 mg/l
< 0.05 mg/l
< 5 mg/l
< 0.2 mg/l
-0.2 < 0 < 0.2
< 0.05 mg/l
[Ca
< 30mg/l
- 7 -
Solid stainless steel
< 250 mg/l at 50°C
< 100 mg/l at 75°C
< 10 mg/l at 90°C
< 400 mg/l
No requirement
6 – 10
No requirement
No requirement
No requirement
No requirement
< 0.5 mg/l
< 7 mg/l
< 2 mg/l
No requirement
No requirement
No requirement
No requirement
No requirement
4 – 14
2+
2+
-
; Mg
]/ [HCO
] > 0.5
3
No requirement
GB
Publicité
Table des Matières
