Feed Water - Chemistry Limits

ABMA recommended feed water chemistry limits for steam boilers.

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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Feed Water - Chemistry Limits

ABMA recommended feed water chemistry limits for steam boilers.

Maximum Allowable Impurities in Boiler Water

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