What is the process of displacing the atmosphere in a permit space with a noncombustible gas called?

The process of displacing the atmosphere in a permit-required confined space with a noncombustible gas is known as inerting. Inerting is specifically designed to reduce the risk of fire or explosion by altering the atmosphere of the space, primarily by replacing oxygen with an inert gas such as nitrogen or argon. This helps to ensure a safer environment for workers and reduces the potential for combustion.

Inerting is essential in situations where the environment may have flammable gases or vapors, as it effectively eliminates the oxygen necessary for combustion. By using noncombustible gases, the likelihood of ignition is minimized, making it a critical safety measure when working in confined spaces.

Other processes mentioned, such as purging, involve removing contaminants or hazardous gases but do not necessarily involve replacing the atmosphere with noncombustible gas. Vacuuming typically refers to removing liquids or solids, not gas displacement. Flushing usually describes the removal of debris or contaminants using a fluid, rather than altering the atmosphere for safety.