Water Specification for low to medium pressure boiler

Boiler Feed water Specification:-


Boiler Pressure
0-20 Barg 21 o 39 Barg 40 – 59 Barg
Total hardness as CaCo3, mg/ltr, Max 10 1 .5
pH value 8.5-9.5 8.5-9.5 8.5-9.5
Dissolved Oxygen, mg/ltr, Max 0.1 0.02 0.01
Silica as SiO2, mg/ltr Max 5 0.5

Boiler Drum Water Specification


Boiler Pressure
0-20 Barg 21 o 39 Barg 40 – 59 Barg
Total hardness as CaCo3 (For filtered sample), mg/ltr, Not Detectable Not Detectable Not Detectable
Total alkalinity as CaCo3, mg/ltr, Max 700 500 300
Caustic alkalinity as CaCo3, mg/ltr, Max 350 200 60
pH value 11-12 11-12 10.5-11
Resudual Hydrazine as N2H4, mg/ltr, Max .1 -1  (if added) .1-.5  (if added) .05-.3
Dissolved Oxygen, mg/ltr, Max 0.1 0.02 0.01
Silica as SiO2, mg/ltr Max 5 0.5
Ratio Na2SO4 / Caustic alkalinity (as NaOH) Above 2.5 Above 2.5 Above 2.5
Ratio NaNO3 / Caustic alkalinity (as NaOH) Above 0.4 Above 0.4 Above 0.4
Phosphates (As PO4),mg/l max (If added) 20-40 15-30 5-20
Total Dissolved Solids, Mg/l, Max 3500 2500 2500
Silica as SiO2, mg/ltr Max Less than .4 of Caustic Alkalinity Less than .4 of Caustic Alkalinity 15

Above parameters are based as per Standard IS 10392:1982.

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