Cooling Tower
Type of problems occurs in Cooling Towers
- Corrosion
- Scaling
- Fouling
- Microbiological growth
Corrosion (An Electrochemical Reaction)
- Pitting Corrosion
- Erosion Corrosion
- Stress Cracking Corrosion
- Galvanic Corrosion
Scaling
CaCO3
:
Due to breakdown of bicarbonate
CaSO4
:
Due to Calcium & Sulphate
CaPO4
:
Usually too much water treatment
CaSiO2
:
High concentration of Silica
MnO2
:
High level of Manganese & Oxide
MgSiO2
:
High level of Magnesium & Silicates
MgCO3
:
High level of Magnesium with High pH & CO2
Iron Oxide
:
Caused by lack of corrosion control or naturally occurring ion being oxidized
Iron Phosphate
:
Compound caused by poor film formation of the phosphate inhibitor
Reasons For Corrosion:
- Metallurgy of the system
- pH of the circulation water
- Suspended and dissolved solids
- Dissolved gases
- Water velocity
- Microbial growth
Fouling (Deposition of suspended solids)
- Biological Growth : Due to Algae
- Corrosion Products : Due to Corrosion products
- Slit : Due to insoluble Particles like Si, Al
- Others : Air particles, Contamination like Oil, Process Leaks
Microbiological Growth
- Algae
- Fungi
- Bacteria
- Iron Bacteria
- Sulphate reducing Bacteria
