Instructions for installation and use
VXe Solo HT
© Danfoss | Produced by Danfoss Redan A/S | 2023.01 | 35
AQ440953137531en-010102
For more information please follow this
link
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ሺͳǤͶͶͲͶ̱͵ͳሻ ሺሻǡ Ǧ ሺሻ
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Plate
Brazing material
Parameter
Unit
Value or concentration
AISI 316L
W.Nr. 1.4404
Cu
CuNi
StS
pH
< 6.0
o
-
-
o
6,0
–
7.5
+
o/-
o
+
7.5
–
10.5
+
+
+
+
>10.5
+
o
o
+
Conductivity
µS/cm
<10
+
+
+
+
10
–
500
+
+
+
+
500
–
1000
+
o
+
+
>1000
+
-
o
+
Free Chlorine
mg/l
<0.5
+
+
+
+
0.5
–
1
o
+
+
+
1
–
5
-
o
o
o
>5
-
-
-
-
Ammonia (NH
3
, NH
4
+
)
mg/l
<2
+
+
+
+
2
–
20
+
o
o
+
>20
+
-
-
+
Alkalinity (HCO
3
-
)
mg/l
<60
+
+
+
+
60
–
300
+
+
+
+
>300
+
o
+
+
Sulphate (SO
4
2-
)
mg/l
<100
+
+
+
+
100
–
300
+
o/-
o
+
>300
+
-
-
+
HCO
3
-
/ SO
4
2-
mg/l
>1.5
+
+
+
+
<1.5
+
o/-
o
+
Nitrate (NO
3
)
mg/l
<100
+
+
+
+
>100
+
o
+
+
Manganese (Mn)
mg/l
<0.1
+
+
+
+
>0.1
+
o
o
+
Iron (Fe)
mg/l
<0.2
+
+
+
+
>0.2
+
o
+
+
* Hardness ratio
[Ca
2+
, Mg
2+
]/[HCO
3
-
]
/
0
–
0.3
+
-
-
+
0.3
–
0.5
+
o/-
+
+
>0.5
+
+
+
+
+ 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 Chloride concentration
at T ≤ 20°C
max 1000 mg/l
at
T ≤ 50°C
max 400 mg/l
at T ≤ 80°C
max 200 mg/l
at T ≥ 100°C
max 100 mg/l
For more information please follow this link
:
https://assets.danfoss.com/documents/192075/
18. GUIDELINES FOR WATER QUALITY IN DANFOSS BRAZED HEAT EXCHANGERS