Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! ABMA recommended feed water chemistry limits for steam boilers.
The maximum recommended
Total Dissolved Solids (TDS) total alkalinity total dissolved solids
ABMA - American Boiler Manufacturers Association:
Boiler Feed Water - Chemistry Limits Boiler Operating Pressure (psig) (bar) Total Dissolved Solids - TDS - ( ppm) Total Alkalinity (ppm) Total Suspended Solids (ppm) 0 - 50 0 - 3.5 2500 500 50 - 300 3.5 - 20 3500 700 15 300 - 450 20 - 30 3000 600 10 450 - 600 30 - 40 2500 500 8 600 - 750 40 - 50 1000 200 3 750 - 900 50 - 60 750 150 2 900 - 1000 60 - 70 625 125 1
Maximum Allowable Impurities in Boiler Water
Boiler Feed Water - Maximum Allowable Impurities Chemical Symbol Maximum Concentration (ppm) Sodium sulphite NA 2SO 3 1.0 Sodium chloride NaCl 10.0 Sodium phosphate NA 3PO 4 25.0 Sodium sulphate NA 2SO 4 25.0 Silica oxide SiO 2 0.20 Related Topics Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more. Related Documents The International Boiler and Pressure Vessel Code safety rules governing design, fabrication, and inspection of boilers and pressure vessels, and nuclear power plant components during construction. Combustion gross and net calorific value. Suspended solids in the feed water will remain in the boiler when steam is generated. Calculate boiler blowdown rate. Steam boilers output can be expressed in Boiler Horsepower, MBTU or in Pounds of Steam delivered per hour. Impurities from the feedwater will concentrate in the boiling water. Cavitation occurs in fluid flow systems where the local static pressures are below the fluids vapor pressure. Cavitation of impellers increases with water temperatures. Make-up water to steam boilers should be treated with oxygen scavengers to avoid serious corrosion problems. Boiler output vs. feed water temperature. Typiclal limits for impurities in drinking water. Water velocities in pipes and tubes should not exceed certain limits.
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