Purging uses of an inert gas to sweep is a standard practice.

• A. False
• B. Sometimes
• C. True
• D. Never

Answer: (C)

Purging a space or line with an inert gas is used to create a non-flammable environment by displacing air and flammable vapors before work. The inert gas, like nitrogen, doesn’t support combustion, so pushing it through a vessel or piping reduces the amount of flammable vapor and lower-oxidizer conditions, which lowers the chance of ignition during maintenance, welding, or startup. Because this approach is a common safety measure across industries to prevent fires and explosions, it’s standard practice. There are occasional situations where other controls are prioritized or purging isn’t performed, but in most scenarios the practice is considered standard.