97
Appendix A - Heat Exchanger Corrosion Resistance
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
Concentration
(mg/l or ppm)
Time Limits -
Analyze Before
AISI
316
SMO
254
Copper
Alloy
Nickel
Alloy
Alkalinity
(HCO
3
-
)
< 70
Within 24
Hours
+
+
0
+
70-300
+
+
+
+
> 300
+
+
0/+
+
Sulfate (SO
4
2-
)
< 70
No Limit
+
+
+
+
70-300
+
+
0/-
+
> 300
0
0
-
+
HCO
3
-
/ SO
4
2-
> 1.0
No Limit
+
+
+
+
< 1.0
+
+
0/-
+
Electrical
Conductivity
< 10µS/cm
No Limit
+
+
0
+
10-500 µS/cm
+
+
+
+
> 500 µS/cm
+
+
0
+
pH
< 6.0
Within 24
Hours
0
0
0
+
6.0-7.5
0/+
+
0
+
7.5-9.0
+
+
+
+
> 9.0
+
+
0
+
Ammonium
(NH
4
+
)
< 2
Within 24
Hours
+
+
+
+
2-20
+
+
0
+
> 20
+
+
-
+
Chlorides (Cl
-
)*
< 300
No Limit
+
+
+
+
> 300
0
+
0/+
+
Free Chlorine
(Cl
2
)
< 1
Within 5 Hours
+
+
+
+
1-5
+
+
0
+
> 5
0/+
+
0/-
+
Hydrogen
Sulfide (H
2
S)
< 0.05
No Limit
+
+
+
+
> 0.05
+
+
0/-
+
Free
(aggressive)
Carbon Dioxide
(CO
2)
< 5
No Limit
+
+
+
+
5-20
+
+
0
+
> 20
+
+
-
+
*See Chloride Content Table
Summary of Contents for RQ NextGen Series
Page 2: ......
Page 26: ...26 Figure 3 RQ Cabinet Standard and Power Exhaust Gasket Locations...
Page 40: ...40 Figure 23 Post Corner Hole Piping Figure 24 Post Back Hole Piping...
Page 88: ...88 Gas Heater Operating Instructions Figure 36 Gas Heater Instructions...
Page 95: ...95...
Page 96: ...96...
Page 105: ...105 Maintenance Log E Coated Coil...
Page 107: ...107...
