Hydrological data

Acceptable range

 

 

Free carbonic acid

8–15 mg/dm3

Accompanying carbonic acid

8–15 mg/dm3

Corrosive carbonic acid

0 mg/dm3

Sulphides

Free

 

 

Oxygen

< 10 mg/dm3

Chloride ions

< 50 mg/dm3

Sulphate ions

< 250 mg/dm3

Nitrates and nitrites

< 10 mg/dm3

CSB

< 7 mg/dm3

Ammonia

< 5 mg/dm3

Iron

< 0, 2 mg/dm3

Manganese

< 0, 2 mg/dm3

Conductivity

< 2200 µS/cm

 

 

Residue on evaporation

< 500 mg/dm3

Potassium permanganate consumption

< 25 mg/dm3

Suspended matter

< 3 mg/dm3

Particular size range filtration

> 3 < 15 mg/dm3 part flow purification recommended

recommendations

> 15 mg/dm3 continuous purification recommended

Closed-loop water specifications

Raw water

Treated water system

 

 

 

pH

6.5–9.5

8.0–10.0

 

 

 

Specific conductance at 25°C

10–1,000 ∝mhos

10–4,500 ∝mhos

 

 

 

"M" Alkalinity (CaCO3)

20–300 ppm

100–1,000 ppm

Sulfur (SO4)

0–150 ppm

0–150 ppm

Chloride (Cl)

0–150 ppm

0–150 ppm

 

 

 

Hardness (CaCO3)

0–350 ppm

0–350 ppm

Calcium hardness (CaCO3)

0–200 ppm

0–200 ppm

Magnesium hardness (CaCO3)

0–150 ppm

0–150 ppm

Copper (Cu)

< 0.10 ppm

< 0.20 ppm

 

 

 

Iron (Fe)

< 3.0 ppm

< 3.0 ppm

 

 

 

Aluminum (Al)

0.5 ppm maximum

0.5 ppm maximum

 

 

 

Sodium (Na)

0–1,000 ppm

0–1,000 ppm

 

 

 

Silica (SiO2)

0–150 ppm

0–150 ppm

Zinc (Zn)

1.0 ppm maximum

1.0 ppm maximum

 

 

 

Manganese (Mn)

0.1 ppm maximum

0.1 ppm maximum

 

 

 

Phosphate Ortho- (PO4)

3 ppm

3 ppm

Nitrite (NO2)

700–1,200 ppm

700–1,200 ppm

Water quality and leveling requirements, and condensation management 65