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Instructions
16. GUIDELINES FOR WATER QUALITY IN DANFOSS BRAZED HEAT EXCHANGERS
Parameter
pH
Conductivity
Free Chlorine
Ammonia (NH
, NH
)
4 +
3
Alkalinity (HCO
)
3 -
Sulphate (SO
)
4 2-
HCO
/ SO
3 -
4 2-
Nitrate (NO
)
3
Manganese (Mn)
Iron (Fe)
* Hardness ratio
[Ca
, Mg
]/[HCO
]
2+
2+
3 -
+
Good corrosion resistance
o
**Corrosion could happen when more parameters are evaluated with o
o/-
Risk of corrosion
-
Use is not recommended
* Hardness ration limits defined per experience and internal tests in Danfoss laboratory
** In case of three or more parameters evaluated with o consultancy is needed with Consultant for Corrosion & Microbiology or BU HHE Representative
Recommended Chloride concentration to avoid Stress Corrosion Cracking (SCC) in the stainless-steel plates:
Application temperature
at T ≤ 20°C
at T ≤ 50°C
at T ≤ 80°C
at T ≥ 100°C
For more information please follow this
https://assets.danfoss.com/documents/192075/
24
DKDHR
Akva Lux II TDv
Unit
Value or concentration
< 6.0
6,0 – 7.5
7.5 – 10.5
>10.5
<10
10 – 500
µS/cm
500 – 1000
>1000
<0.5
0.5 – 1
mg/l
1 – 5
>5
<2
mg/l
2 – 20
>20
<60
mg/l
60 – 300
>300
<100
mg/l
100 – 300
>300
>1.5
mg/l
<1.5
<100
mg/l
>100
<0.1
mg/l
>0.1
<0.2
mg/l
>0.2
0 – 0.3
/
0.3 – 0.5
>0.5
Chloride concentration
max 1000 mg/l
max 400 mg/l
max 200 mg/l
max 100 mg/l
link:
AQ163586471118en-010202
Plate
AISI 316L
Cu
W.Nr. 1.4404
o
-
+
o/-
+
+
+
o
+
+
+
+
+
o
+
-
+
+
o
+
-
o
-
-
+
+
+
o
+
-
+
+
+
+
+
o
+
+
+
o/-
+
-
+
+
+
o/-
+
+
+
o
+
+
+
o
+
+
+
o
+
-
+
o/-
+
+
Brazing material
CuNi
StS
-
o
o
+
+
+
o
+
+
+
+
+
+
+
o
+
+
+
+
+
o
o
-
-
+
+
o
+
-
+
+
+
+
+
+
+
+
+
o
+
-
+
+
+
o
+
+
+
+
+
+
+
o
+
+
+
+
+
-
+
+
+
+
+
Danfoss District Energy
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