Which of the following best describes the purpose of an inert gas purge in a vessel?

• A. To displace air and reduce flammability
• B. To increase oxygen
• C. To cool the gas
• D. To pressurize the vessel

Answer: (A)

The main idea is that an inert gas purge is used to create an environment inside the vessel that is not supportive of combustion. It does this by displacing the air with an inert gas, like nitrogen, which lowers the concentration of oxygen and dilutes any flammable vapors. With less oxygen and fewer reactive components present, the chance of ignition from sparks or heat is significantly reduced, making it safer for procedures like opening, cleaning, filling, or transferring materials. It is not about increasing oxygen, cooling the gas, or pressurizing the vessel, which are not the purposes of this purge.