UFC 3-240-13FN
25 May 2005
Table 3-9. Suggested Feedwater Limits for Industrial Water Tube Boiler
2075-4137 KPa (301-600 psig)
Feedwater Property
ASME
ABMA
USACE
Dissolved oxygen ppm O2 before chemical oxygen
Note 6
NS
< 0.007
scavenger addition
Total iron ppm Fe (as Fe)
< 0.05
NS
Note 6
Total copper ppm Cu (as Cu)
< 0.025
NS
Note 6
Total Hardness ppm (as CaCO3)
< 0.3
NS
Note 6
pH at 25 C (77 F)
8.3-10.5
NS
Note 6
Non-volatile TOC ppm (as O2)
<1
NS
Note 6
Oily matter ppm
<1
NS
Note 6
NOTES:
1. Makeup water percentage: Up to 100% of feedwater.
2. Assumes existence of deaerator.
3. Conditions: no superheater, turbine drives, or process restriction on
steam purity.
4. Steam purity: 1.0 ppm TDS maximum.
5. NS = not specified.
6. See ABMA Standard Boiler 401
Table 3-10. Suggested Feedwater Limits for Industrial Fire Tube Boiler
0-2068 KPa (0300 psig)
Feedwater Property
Limit
Dissolved oxygen (ppm O2) before chemical oxygen scavenger addition
< 0.007
Total iron ppm Fe (as Fe)
< 0.1
Total copper ppm Cu (as Cu)
< 0.05
Total Hardness ppm (as CaCO3)
< 1.0
PH at 25 C (77 F)
8.3-10.5
Non-volatile TOC ppm (as O2)
< 10
Oily matter ppm
<1
NOTES:
1. Makeup water percentage: up to 100% of feedwater.
2. Assumes existence of deaerator.
3. Conditions: no superheater, turbine drives, or process restriction on
steam purity.
4. Steam purity: 1.0 ppm TDS maximum.
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