7 WAYS TO PREVENT CORROSION IN BOILER

Corrosion is the gradual deterioration of metals by chemical reactions with their environment.

Effects:

1. Pinpoint penetration of metal
2. Rusting of ferrous metals
3. Pits can penetrate deep into the metal that can result in rapid failure of feed lines, economiser tubes and boiler tubes
4. Ultimate failure of boiler metal, steam mains and condensate lines
Causes:

1. Dissolved oxygen in boiler water.
2. Presence of corrosive gases such as Oxygen (O2), Carbon Dioxide (CO2), Hydrogen Sulphide (H2S) in the boiler water
3. Sludges of bicarbonate and carbonate
4. Low PH
5. Low feed water temperature
6. Acidity imparted to water due to decomposition of Carbon Dioxide (CO2) or Hydrogen Sulphide (H2S)
PREVENTIVE MEASURES:

1. Eliminating corrosive gases
2. Removal of dissolved oxygen
3. High PH value of boiler water
4. Mechanical deaeration of boiler water
5. Higher feed water temperature i.e. reduces its oxygen content.
6. Chemical de-oxygenation by use of oxygen scavengers i.e. sodium sulphite
7. Hot condensate return as it contains less O2 then feed water and also saves fuel.

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