Boiler Water: Silica ppm SiO 2 < 150 < 90 < 150Total alkalinity ppm as CaCO 3 < 1000 < 850 < 700Free OH alkalinity ppm (Note 4) Not Specified: Not Specified: Not Specified: Specific conductance S/cm @ 25 °C without neutralization < 7000 < 5500 < 70001. Values in the table assume existence of a deaerator. 2.
Boiler Feed Water and Boiler Water - EWT Water Technology
EN 12953-10 / Shell boilers Requirements for boiler feed water and boiler water quality; national codes and standards: BS 2486 / Recommendations for Treatment of Water for Steam Boilers and Water Heaters (United Kingdom obsolete) TRD 611 / Feed Water and Boiler Water of Group IV Steam Generators (Germany obsolete)
Requirements for feed and boiler water : Unit: Feed water: Boiler water. Appearance Clear and free of mud: Clear and free of mud: Hardness. ppm CaCO 3: 0 5 Chloride content: ppm Cl <15 <100 P alkalinity. ppm CaCO 3 100 150: Total (T) alkalinity. ppm CaCO 3 <2 x P Alkalinity. PH-value at 25°C 8.5 9.5: 10.5 11.5. Hydrazine excess. ppm N 2 H 4
The boiler water concentration in the steam drum should be specified in the job specification. Samples of water for testing should be taken from the continuous blowdown. Samples should be taken through a cooling coil to prevent flashing.
Boiler and feed water must be chemically treated in order to avoid corrosion and scaling in the boiler. The following text regarding feed and boiler water treatment is the normal recommendations for boilers with working pressure below 20 bars.
Water Specification for low to medium pressure boiler
Water Specification for low to medium pressure boiler. Leave a Comment / Boilers and Heaters. Boiler Feed water Specification:-. Boiler Pressure. 0-20 Barg. 21 o 39 Barg. 40 59 Barg. Total hardness as CaCo3 mg/ltr Max. 10.