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Condensate corrosion can also occur when poorly de-aerated feedwater enters the boiler and oxygen flashes with the steam. Since carbon dioxide has a high vapor liquid distribution ratio, most of it condenses in the farthest points of the condensate system. Vented condensate receivers assist in removing some of the carbon dioxide to reduce the amount of acid formed. Condensate corrosion causes severe metal loss and damage to equipment. The metal ions lost to corrosion also return to the boiler where they can cause deposition, efficiency loss, and failure.
Chemical treatment programs which utilize neutralizing, filming agents, and oxygen scavengers minimize the effects of condensate corrosion. The most effective way to minimize the costs of treatment is to reduce the alkalinity in the feedwater by demineralization, dealkalization, or reverse osmosis.