UFC 3-240-13FN
25 May 2005
Table 3-14. ASME Boiler Water Limits for Industrial Water Tube Boilers
Boiler Water
Property
≤ 150
≤ 90
≤ 40
≤ 30
≤ 20
≤8
≤2
≤1
Silica (ppm SiO2)
Total alkalinity
< 350
< 300
< 250
< 200
< 150
< 100
NS
NS
Free OH alkalinity
NS
NS
NS
NS
NS
NS
ND
ND
Specific conductance
4600-
3800-
1500-
1200-
1000-
≤150
≤80
(mhos/cm) without
5400-1100
900
800
300
200
200
TDS (maximum) ppm
1.0-0.2
1.0-0.2
1.0-0.2
0.5-0.1
0.5-0.1
0.5-0.1
0.1
0.1
NOTES:
1.
Makeup water percentage: Up to 100% of feedwater.
2.
Assumes existence of deaerator.
3.
Conditions: Includes superheater, turbine drives, or process restriction on steam purity.
4.
Saturated steam purity target as shown.
5.
NS = Not specified.
6.
ND = Not detectable.
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