Feed Water - Chemistry Limits

ABMA recommended feed water chemistry limits for steam boilers

The maximum recommended

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

 according to ABMA - American Boiler Manufacturers Association:

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

ChemicalSymbolMaximum 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

Related Topics

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

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