J OIL-E-08 2008
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5
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IMPORTANT
Recommended Water Conditions
It is very important that a strict water management program is followed
to ensure trouble free boiler operation.
The following are recommended for feedwater and boiler water.
FEEDWATER (water entering boiler)
pH Value 8.5 to 9.5 tested at room temperature,
Hardness
less than 2.0 mg/kg in the form of CaCO
3
,
Suspended Solids None
Chloride Less than 50 mg/kg
Organic Matter Less than 5 mg/kg
Oil None
BOILER WATER (water inside boiler)
pH Value 9.5 - 11.5, tested at room temperature
Hardness Not detectable
Suspended Solids Less than 100 mg/kg
Chloride Less than 500 mg/kg
Oxygen Scavenger,
Sodium Sulphite or Tannin 20 to 50mg/kg
Phosphate Less than 50 mg/kg, in the form of PO
4
Total Alkalinity Less than 1000 mg/kg
Caustic Alkalinity Less than 300 mg/kg as CaCO
3
Total Dissolved Solids (TDS) Less than 2000 ppm
Iron Less than 1 mg/kg
Silica Less than 150 mg/kg, in the form of SiO
2
Dissolved Oxygen None
mg/kg = Milligrams per Kilogram
CaCO
3
= Calcium Carbonate
PO
4
= Phosphate
SiO
2
= Silica
1 Grain hardness = 17.118 ppm
therefore 70ppm = 4.10 grains hardness.
For practical purposes mg/kg = ppm
It is critical that the boiler water pH be alkaline (9.5 - 11.5) whenever water is in the boiler.
Daily boiler blowdown is essential to help prevent formation of deposits and reduce
Total Dissolved Solids (TDS).
Consult your Water Treatment specialist to establish the frequency and duration
of blowdown required to achieve the required water conditions.
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