Recommended Feed Water Chemistry Limits

Steam boilers and ABMA recommended feed water chemistry limits

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The maximum recommended concentration limits of

  • Total Dissolved Solids (TDS)
  • total alkalinity
  • total dissolved solids

 according to ABMA - American Boiler Manufacturers Association - are given in the table below:

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

Chemical Symbol Maximum Concentration (ppm)
Sodium sulphite NA2SO3 1.0
Sodium chloride NaCl 10.0
Sodium phosphate NA3PO4 25.0
Sodium sulphate NA2SO4 25.0
Silica oxide SiO2 0.20

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Related Topics

  • Steam and Condensate - Steam & condensate properties - capacities, pipe sizing, systems configuration and more

Related Documents

  • ASME - International Boiler and Pressure Vessel Code - The International Boiler and Pressure Vessel Code establishes rules of safety governing the design, fabrication, and inspection of boilers and pressure vessels, and nuclear power plant components during construction
  • Boiler Blowdown - Suspended solids entering boilers through feed water will remain behind when steam is generated. After a while the concentration of solids makes the operation of the boiler unsatisfactory
  • Boiler Blowdown Rate - Calculating boiler blowdown rate
  • Total Dissolved Solids (TDS) - In a boiler generating steam, impurities in the feedwater concentrates in the boiling water

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