What should the temperature of the feedwater be when using a deaerating heater?

In the operation of a deaerating heater, the feedwater temperature is crucial for effective removal of dissolved gases, primarily oxygen and carbon dioxide, which can cause corrosion in boiler systems. The correct temperature for feedwater when utilizing a deaerating heater is typically around 215°F. At this temperature, the water is sufficiently heated to drive off these gases, improving the quality of the feedwater entering the boiler.

Deaerating heaters work by increasing water temperature and utilizing steam to facilitate the removal of gases. The higher temperature not only enhances the efficiency of gas removal but also ensures that the water can approach saturation conditions, aiding in the reduction of corrosion and preventing the formation of scale within the boiler system.

While other temperatures listed may seem plausible, they do not typically provide the optimal conditions necessary for effective deaeration. Lower temperatures do not promote the efficient release of dissolved gases, potentially leading to higher corrosion rates in subsequent boiler operation. Thus, the 215°F setting is favored for effective operation of deaerating heaters.