Minnesota Boiler License Practice Exam

What is the purpose of the bottom blowdown on a steam boiler?

1. To check the steam gauge

2. To remove sludge and sediment and to drain the boiler

3. None of the answers given

4. To clean the burner assembly

The correct answer is: To remove sludge and sediment and to drain the boiler

The primary purpose of the bottom blowdown on a steam boiler is to remove sludge and sediment that accumulates at the bottom of the boiler, as well as to help drain the boiler. Over time, dissolved solids in the water can precipitate out and settle on the bottom of the boiler. If not regularly removed, this accumulation can lead to operational issues, such as reduced efficiency, overheating of the boiler, and potentially hazardous conditions like boiler failure. By performing a bottom blowdown, operators can flush out these impurities, ensuring that the water quality remains within acceptable limits and the boiler operates safely and efficiently. This process is an essential aspect of regular boiler maintenance and helps maintain the longevity of the equipment. The other options listed do not pertain to the function of the bottom blowdown. Checking the steam gauge is related to monitoring the operating pressure of the boiler, cleaning the burner assembly is part of maintenance for the combustion system, and "none of the answers given" does not apply since one of the choices accurately describes the function.