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Feed Water - Chemistry Limits

ABMA recommended feed water chemistry limits for steam boilers.

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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
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