Vacuum deaerators remove dissolved gases including oxygen, nitrogen and carbon dioxide.
The risk of corrosion, scaling and plugging of piping in the district heating systems can be minimized significantly by reducing the content of oxygen and CO2 in the water.
For every m3 of untreated make-up water, 10-15 g of iron will be converted by corrosion. Untreated make-up water contains 8-10 mg/l of oxygen but with a vacuum deaerator, the oxygen content can be reduced to less than 0.2 mg/l.