I:\01KONSTR\4_betranl_2002\1_1_Boreas\Table of constancy.doc
13.12.02
Table of Constancy
for
Stainless, steel m.-no. (AISI 316) and copper
(materials of water-cooled condenser in plate design)
Content of water:
Concentration
[mg/l]
M.-no.: 1.4401
Copper
Organic elements
ñ
ó
Hydrogen carbonate (HCO
3
-
)
< 70
70 – 300
> 300
ñ
ñ
ñ
ó
ñ
ó
/
ñ
Sulfate (SO
4
2-
)
< 70
70 – 300
> 300
ñ
ñ
ò
ñ
ó
/
ò
ò
HCO
3
-
/ SO
4
2-
> 1.0
< 1.0
ñ
ñ
ñ
ó
/
ò
Electric conductivity
< 10 µS/cm
10 - 500 µS/cm
> 500 µS/cm
ñ
ñ
ñ
ó
ñ
ò
Ammonium (NH
3
)
< 2
2 – 20
> 20
ñ
ñ
ñ
ñ
ó
ò
Chloride
*)
(Cl
-
)
< 300
> 300
ñ
ó
ñ
ó
/
ñ
Sulphite (SO
3
), free chlorine gas (Cl
2
)
< 1
1 – 5
> 5
ñ
ñ
ó
/
ñ
ñ
ó
ó
/
ò
Iron (Fe), solute
< 0.2
> 0.2
ñ
ñ
ñ
ó
Free aggressive carbon dioxide (CO
2
)
< 5
5 – 20
> 20
ñ
ñ
ñ
ñ
ó
ò
Manganese (Mn), solute
< 0.1
> 0.1
ñ
ñ
ñ
ó
Aluminium (Al), solute
< 0.2
> 0.2
ñ
ñ
ñ
ó
pH-value
< 6
6.0 – 7.5
7.5 – 9.0
> 9
ó
ó
/
ñ
ñ
ñ
ó
ó
ñ
ó
Nitrate (NO
3
), solute
< 100
> 100
ñ
ñ
ñ
ó
Hydrogen sulphide (H
2
S)
< 0.05
> 0.05
ñ
ñ
ñ
ó
/
ò
Glycol part
< 20%
20 - 50 %
> 50 %
ñ
ñ
ñ
ñ
ñ
ñ
Total hardness
4,0 - 8,5 °dH
ñ
ñ
*)
max. 60°C
ñ
under normal circumstances good constancy
ó
danger of corrosion, especially if more substances with
ó
present
ò
not suitable
Hint:
The table shows a summary of the limit values for stainless steel 1.4401 (AISI 316) as well as pure copper (99,9%) in water considering
several chemical factors. Corrosion is developed from a complex process and arises by coincidence of different factors. On the other hand
the influence factors concerned have strengthening or weakening effects on each other. So the table should by considered only as a
simplified description. Special attention should be paid to the concentration quantities and the limits. In case of doubt please contact the
manufacturer with a water analysis. Warranty claims will only be accepted if following point of the above list is met: “under normal
circumstances good constancy”. This table is part of offers and orders.
