What is the purpose of inerting in the tank-cleaning sequence?

• A. To introduce inert gas to reduce oxygen and suppress vapors.
• B. To ignite residual vapors.
• C. To wash with inert solvent.
• D. To cool the tank.

Answer: (A)

Inerting creates an atmosphere in the tank that is safe from flames by removing enough oxygen and diluting any remaining vapors. By flooding the space with inert gas (usually nitrogen), the oxygen level is reduced so that flammable vapors cannot reach the mixture needed for ignition. This makes cleaning operations safer, as the risk of explosion or ignition during residue removal and handling is greatly lowered. It’s not about lighting vapors, washing with an inert solvent, or cooling the tank—the goal is to suppress vapors and prevent combustion by creating a non-oxidizing, low-oxygen environment.