What is the purpose of a blind nipple in regards to boiler maintenance?

The purpose of a blind nipple in boiler maintenance is specifically to plug a tube hole after removal. When a boiler tube is taken out for maintenance or replacement, a blind nipple serves as a means to seal the opening. This is critical because it helps to maintain the boiler's integrity and pressure by preventing leaks or the entry of contaminants.

Choosing the blind nipple as a sealing device ensures that the boiler system maintains its expected performance and efficiency during maintenance activities. Other options, such as providing access to the boiler or monitoring pressure levels, do not accurately reflect the function of a blind nipple, which is specifically designed for the sealing task.