What is the main function of flame screens?

The main function of flame screens is to prevent flames from entering tanks. These screens act as a safety device, particularly in applications involving flammable materials, by allowing gases to escape while blocking any flames or sparks from entering the tank. This is crucial in maintaining safety during the storage and handling of volatile substances, as it helps to reduce the risk of fire and explosion.

Flame screens typically employ a mesh or other barrier designed to stop flames, thus acting as a protective measure against ignition sources. By ensuring that only gases can pass through while blocking fire, they serve an essential role in maintaining the integrity and safety of storage tanks in various industrial situations.

The other options do not align with the primary purpose of flame screens. While improving fuel efficiency, cooling tank contents, and measuring tank pressure are important operational aspects in many systems, they do not pertain to the protective function that flame screens provide.