The vacuum Deaerator produces water with Outlet oxygen concentration max.25 ppb(with a chemical injection of max. 2 ppb) in the temperature range of 20 -40°C. The vacuum Deaerator column has two stages. Stage 1 spray section with packing+ spray/Stage 2 is the packed section. The first stage of the tower performs bulk removal of oxygen at pressure ~60 mmbara, and in the second stage, final removal is achieved at a higher vacuum. The tower storage hold up time is ~5 minutes. The height of the skirt deaerator is ~7m, which will provide about >6 NPSHa for the pump. It prevents high vacuum in the suction pump. Therefore we have lower leakage. For the high vacuum required, an air ejector /vacuum liquid ring pump system with the cool seal water20 °C is required.