Appendix A - Heat Exchanger Corrosion Resistance - AAON RN Series Installation Operation & Maintenance
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- Installation operation & maintenance (108 pages)
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Appendix A - Heat Exchanger Corrosion Resistance
Corrosion Resistance of Copper and Stainless Steel in Brazed Plate Heat Exchangers
- Points to Measure and Check in a Water Analysis
The resistance guide provides the corrosion resistance of stainless steel type AISI 316 and pure
Copper (99.9%) in water, to a number of important chemical factors. The actual corrosion is a very
complex process influenced by many different factors in combination.
Explanations: + Good resistance under normal conditions
0 Corrosion problems may occur especially when more factors are valued 0
- Use is not recommended
Water
Containing
Alkalinity
-
(HCO
)
3
2-
Sulfate (SO
)
4
-
2-
HCO
/ SO
3
4
Electrical
Conductivity
pH
Ammonium
+
(NH
)
4
-
Chlorides (Cl
)*
Free Chlorine
(Cl
)
2
Hydrogen
Sulfide (H
S)
2
Free
(aggressive)
Carbon Dioxide
(CO
2)
*See Chloride Content Table
Concentration
Time Limits -
(mg/l or ppm)
Analyze Before
< 70
70-300
> 300
< 70
70-300
> 300
> 1.0
< 1.0
< 10µS/cm
10-500 µS/cm
> 500 µS/cm
< 6.0
6.0-7.5
7.5-9.0
> 9.0
< 2
2-20
> 20
< 300
> 300
< 1
1-5
Within 5 Hours
> 5
< 0.05
> 0.05
< 5
5-20
> 20
AISI
316
+
Within 24
+
Hours
+
+
No Limit
+
0
+
No Limit
+
+
No Limit
+
+
0
0/+
Within 24
Hours
+
+
+
Within 24
+
Hours
+
+
No Limit
0
+
+
0/+
+
No Limit
+
+
+
No Limit
+
SMO
Copper
Nickel
254
Alloy
Alloy
+
0
+
+
+
0/+
+
+
+
0/-
0
-
+
+
+
0/-
+
0
+
+
+
0
0
0
+
0
+
+
+
0
+
+
+
0
+
-
+
+
+
0/+
+
+
+
0
+
0/-
+
+
+
0/-
+
+
+
0
+
-
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
121
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