What is the primary purpose of the bottom blow down on a steam boiler?

The primary purpose of the bottom blow down on a steam boiler is to remove sludge and sediment that accumulate at the bottom of the boiler. Over time, impurities in the feedwater can settle at the bottom, leading to the formation of sludge and sediments. If not removed, these deposits can cause various issues including corrosion, reduced efficiency, and even damage to the boiler itself.

By performing a bottom blow down, operators can discharge a portion of the water along with the accumulated contaminants, thereby maintaining the boiler's health and efficiency. This practice is essential for ensuring proper water quality, which in turn supports safe and efficient operation. Regular blow downs help in managing the concentration of dissolved solids and keeping the boiler water chemistry within desired limits, contributing to overall safety and performance.