REYMSA COOLING TOWERS, INC.
www.reymsa.com
62
C.3 WATER TREATMENT AND WATER CHEMISTRY
The Cooling Tower requires a water treatment program to ensure the efficiency of the system operation,
extending its service life. A qualified water treatment company should design a specific program for the
Tower best operation.
A Cooling Tower is part of a carefully engineered heat exchange system. Any film or deposit which forms on
the waterside heat exchange surface reduces the heat exchange efficiency of the system. System reliability
can be sharply reduced by maintenance shutdowns required for removal of waterside deposits, replacement
of spray pump shaft seals damaged by suspended particles in the water, or repairs required by waterside
corrosion failures.
A water conditioning program must always address the following areas to maintain system reliability:
▪ Suspended solids
▪ Scale formation
▪ Microbiological contamination
▪ Corrosion
▪ Air Contamination
For optimal heat transfer and Tower operation, the water chemistry of the recirculating water should be
maintained within the guidelines listed in Table C-3.
Table C-3: Water chemistry guidelines
WATER CHEMISTRY GUIDELINES
CHARACTERISTIC CONCENTRATION
pH 6.5 - 9
Hardness (as CaCO
3
) 30 - 500 ppm
Alkalinity (as CaCO
3
) 500 ppm max.
TDS (Total Dissolved Solids) 1500 ppm max.
Chlorides (as Cl) 450 ppm max.
Silica (as SiO
4
) 180 ppm max.
Sulfates (as SO
4
) 250 ppm max.
Phosphates (as PO
2
) 15 ppm max.
Note
Risk of scale will be greatly reduced by following this guidelines.
These values do not represent the chemical resistance of FRP.
Operation
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