UFC 3-240-13FN
25 May 2005
Table 3-15. ASME Boiler Water Limits for Industrial Fire Tube Boilers
0-2068 KPa (0300 psig)
Boiler Water Property
Limit
Silica (ppm SiO2)
< 150
Total alkalinity
< 700
Free OH alkalinity
NS
Specific conductance (mhos/cm) without neutralization
< 7000
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.
Table 3-16. ASME Suggested Boiler Water Limits for
Marine Propulsion Water Tube Boiler
3103-5861 KPa
5867-8618 KPa
Boiler Water Property
(450-850 psig)
(851-1250 psig)
Silica (ppm SiO2)
< 30
<5
Total alkalinity
NS
NS
Free OH alkalinity
< 200
ND
Specific conductance (mhos/cm)
< 700
< 150
without neutralization
NOTES:
1. Makeup water percentage: Up to 5% of feedwater.
2. External treatment: at sea, evaporator condensate. In port, evaporator
condensate or water from shore facilities meeting feedwater quality
guidelines.
3. Assumes existence of deaerator.
4. Saturated steam purity: 30 ppb TDS maximum, 10 ppb Na maximum, 20
ppb SiO2 maximum.
5. NS = not specified.
6. ND = non detectable.
7. VAM = Use only volatile alkaline materials.
3-3.6
Shore-to-Ship Steam Quality. NAVSEASYSCOM shore-to-ship steam
purity is specified in NAVSEA S9086-GX-STM-020, Section 220, Volume 2, Boiler
Water/Feedwater Test and Treatment, and PACNAVFACENGCOM P200, Shore-to-
Ship Steam and Feedwater Manual for Naval Facilities.
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