What is the purpose of a blowdown in a steam boiler?

The purpose of a blowdown in a steam boiler is to remove impurities from the water. Over time, minerals and other contaminants can accumulate in the boiler water, primarily due to the evaporation of water and the concentration of dissolved solids. If these impurities are not removed, they can lead to scaling, corrosion, and other operational issues that would compromise the efficiency and safety of the boiler.

Blowdown is a controlled process where a portion of the water, along with its dissolved solids, is drained from the boiler. This helps maintain water quality and the overall health of the boiler system, ensuring it operates efficiently and safely. Regular blowdowns are necessary to manage the concentration of impurities and prolong the lifespan of the boiler.