Question

Water softened by lime soda method is not suitable for high pressure boilers. Substantiate the
effects caused by the same and suggest the possible ways to minimize the effect

Answer 1

High-pressure boilers facilitate the presence of dissolved gases like oxygen and Carbon Dioxide in water. Notably, oxygen in the presence of moisture at high temperatures attacks the boiler-plate that leads to boiler corrosion. To remove the dissolved oxygen from water can be done through a chemical treatment. Therefore, in the process, sodium sulphide or sodium sulphite is added to the water as a reducing agent.