Alberta Boilers Safety Association (ABSA) Practice Test

The primary function of a boiler blowdown is to remove contaminants from the boiler water. Over time, as the water is heated within the boiler, it can accumulate impurities, such as dissolved solids, oils, and other contaminants. These impurities can lead to problems like scaling, corrosion, and reduced efficiency of the boiler system.

Blowdown involves the intentional removal of a portion of the boiler water, which helps to lower the concentration of these contaminants. By performing blowdown, operators can maintain the water quality within the system, ensuring proper functioning and longevity of the boiler. This practice is crucial for maintaining operational efficiency and preventing costly repairs that can arise from poor water quality.

While increasing water pressure, filling the boiler with fresh water, or lowering the temperature are operational aspects related to boiler management, they do not describe the primary purpose of blowdown. Blowdown specifically focuses on managing water quality by eliminating unwanted substances.