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 
BiCarbonate
Alkalinity (HCO_{3}^{=}) 
CALC 
CALC 
CALC 
CALC 

Carbonate
Alkalinity (CO_{3}^{=}) 
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 (SO_{3}^{=}) 
4 
20  60 
4 
20 – 60 

Condensate pH 
4 
7.5 – 8.5 
4 
7.5 – 8.5 

Phosphate (PO_{4}^{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.
BiCarbonate Alkalinity, Carbonate Alkalinity
& Hydroxide Alkalinity à Calculate from P Alkalinity & Total
Alkalinity
Last
Updated :: Wednesday, January 12, 2011