August 2005

Columns

HP Water Management: Audit your deaerator performance

Deaerators remove dissolved oxygen from boiler feedwater to prevent corrosion of downstream components such as feedwater heaters, economizers and boilers. Dissolved oxygen has retrograde solubility, i..

Huchler, L. A., MarTech Systems, Inc.

Deaerators remove dissolved oxygen from boiler feedwater to prevent corrosion of downstream components such as feedwater heaters, economizers and boilers. Dissolved oxygen has retrograde solubility, i.e., the saturation concentration of dissolved oxygen is inversely proportional to water temperature. As water temperature increases in the feedwater circuit, it releases oxygen, which is available to react with steel piping – Result: corrosion. Oxygen-related corrosion is highly localized and forms a pit whose depth increases rapidly under high-temperature conditions. Depending on the dissolved oxygen concentration and water temperature, penetration of the pipe wall and subsequent fa

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