UFC 3-240-13FN
25 May 2005
Table 3-13. ASME Suggested Boiler Water Limits for
Industrial Water Tube Boiler
0-2068 KPa
2075-4137 KPa
Boiler Water Property
(0-300 psig)
(301-600 psig)
Silica (ppm SiO2)
< 150
< 90
Total alkalinity
< 1000
< 850
Free OH alkalinity
NS
NS
Specific conductance (mhos/cm) without
< 7000
< 5500
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.
75
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