GFSE-Std-0499
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 for boiler water.
FEEDWATER
pH Value 8.5 to 9.5 Tested at room temperature.
Hardness less than 2.0mg/kg In the form of CACO
3
Oil None
Suspended Solids None
Organic Matter Less than 5 ppm
Chloride Less than 50 ppm
BOILER WATER
Oxygen Scavenger,
Sodium Sulphide or Tannin 20 to 50 mg/kg Maximum
Phosphate 0 to 50 mg/kg, in the form of PO4
Total Alkalinity 1000 mg/kg Maximum
Caustic Alkalinity Less than 300 mg/kg as CACO
3
Chloride Less than 500 mg/kg
pH Value 9.5 - 11.5, tested at room temperature
Total Dissolved Solids 2000 ppm Maximum
Iron 1 mg/kg Maximum
Silica 180 mg/kg Maximum, in the form of SiO
2
Hardness Not detectable
Dissolved Oxygen None
Suspended Solids 100 mg/kg Maximum
mg/kg = Milligrams per Kilogram
CACO
3
= Calcium Carbonate
PO4 = Phosphate
SiO
2
= Silicon Dioxide
1 Grain hardness = 17.118 ppm -
therefore 70 ppm = 4.10 grains hardness.
For practical purposes mg/kg = ppm
It is critical that the boiler pH be alkaline (9 -11) 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 Maintenance Manual for blowdown procedures.
Consult your Water Treatment specialist to establish the frequency and duration of
blowdown required to achive the required conditions.
Contamination from direct steam injection processes and leaks from indirect
systems must be avoided. Contamination in boiler feedwater / condensate will
result in unstable water levels foaming, carry-over and low water.
To Next Page
Loading...
