Laboratory Services

Control Limit Parameter for testing for various Systems

SYSTEM à PARAMETERS	Closed Loop System		Cooling Tower		Hard Water Steam Boiler		Soft Water Steam Boiler
	Test	Limit	Test	Limit	Test	Limit	Test	Limit
Total Hardness (Mg^2+ & Ca^2+)	4	#	4	#	4	#	4	#
pH ( -log[H^+] )	4	7.5 – 9.5	4	7.5 – 9.5
P Alkalinity	4	200 - 400	4	200 - 500	4	425 - 850	4	425 – 850
Total Alkalinity	4	< 400	4	< 500	4	< 850	4	< 850
Bi-Carbonate Alkalinity (HCO3^=)	CALC		CALC		CALC		CALC
Carbonate Alkalinity (CO3^=)	CALC		CALC		CALC		CALC
Hydroxide Alkalinity (OH^-)	CALC		CALC		CALC		CALC
TDS (Total Dissolved Solids)	4	< 1500	4	< 1500	4	2000 - 3000	4	2000 – 3000
Phosphonates (Organic)			4	#
Chloride (Cl^-)					4	#	4	#
Sulphite (SO3^=)					4	20 - 60	4	20 – 60
Condensate pH					4	7.5 – 8.5	4	7.5 – 8.5
Phosphate (PO4^3-)							4
Softener Hardness							4	< 2
Silica (Si)			4	< 30	4	< 30	4	< 25
Iron (Fe)	4	< 0.1	4	< 0.1	4	< 0.2	4	< 0.2

4 : Testing of Control Parameter should be included for a treated system

# : Value are to be compared with treatment control parameters.

CALC : Calculated value.

Bi-Carbonate Alkalinity, Carbonate Alkalinity & Hydroxide Alkalinity à Calculate from P Alkalinity & Total Alkalinity

Last Updated :: Wednesday, January 12, 2011