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Arctic Installation and Operation Manual
P/N 105641-01
(American Boiler Manufacturers Association
[ABMA], 2005. Boiler Water Quality
Requirements and Associated Steam Quality
for Industrial / Commercial and Institutional
Boilers)"
3.8.2 Objectives
The basic objectives of water treatment are:
1. Prevent the accumulation of scale and
deposits in the boiler.
2. Remove dissolved gases from the water.
3. Protect the boiler against corrosion.
4. Maintain the highest possible boiler fuel
efficiency.
5. Decrease the amount of boiler down
time from cleaning.
3.8.3 Water softener
It is highly recommended that a zeolite water
softener be used for all make-up to the boiler.
It is intended that this be used in addition to
the chemical treatment of the boiler. Water
softening removes calcium and magnesium,
the primary causes of hard boiler scale.
3.8.4 Continuous Monitoring
Water treatment should be checked and
maintained according to Table 15 whenever
the boiler is operating. The boiler operator
should be sure that the boiler is not operating
for long periods without proper water
treatment.
Water treatment may vary from season to
season or over a period of time. Therefore,
the water treatment procedure should be
checked not less than four times a year and
possibly more frequently as the local water
conditions may indicate.
See Table 14 for examples of typical chemical
agents found in untreated water along with
their potential effects.
29
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Table 14: Chemical Agents and Effects
Compound
Calcium Carbonate,
(CaCO3)
Calcium Bicarbonate
(CaHCO3)
Calcium Sulphate (CaSO4)
Calcium Chloride (CaCl2)
Magnesium Carbonate
(MgCO3)
Magnesium Bicarbonate
(MgHCO4)
Magnesium Sulphate
(MgSO4)
Silicon Dioxide (SiO2)
It should be noted that water boilers may well
need chemical treatment for the first filling
plus additional periodic chemical treatment,
depending on system water losses and the
makeup requirements.
All water introduced into the boiler should be
softened and should include an oxygen
scavenger like sodium sulfite. This is required
to remove dissolved oxygen from the water.
Dissolved oxygen will cause severe system
corrosion.
Dissolved Oxygen
Total Iron
Total Copper
Total Hardness
pH
Nonvolatile TOC
Oily Matter
Table 15 Recommended Feed Water
Limits
www.thermalsolutions.com
sales@thermalsolutions.com
Form: 2435-3
Revision: 10
Date: 12-1-2018
Effect
Soft Scale
Soft scale,
CO2
Hard Scale
Corrosion
Soft Scale
Corrosion,
Scale
Corrosion
Hard Scale
< 0.007 ppm
≤ 0.1 ppm
≤ 0.05
≤ 9
≤ 0.5
ppm
grains/gal
8.3 – 10.0
< 1 ppm
< 1 ppm
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