Why deaerator kept at 15.5 high?

A deaerator is typically maintained at a pressure of 15.5 psi to effectively remove dissolved gases, particularly oxygen and carbon dioxide, from boiler feedwater. This pressure helps to increase the water temperature, enhancing the efficiency of the deaeration process and preventing corrosion in the boiler system. Operating at this pressure strikes a balance between effective gas removal and energy efficiency, ensuring optimal performance in steam generation.