What are flashback flames?

Flashback flames refer to flames that travel back into a fuel supply or gas line. This phenomenon occurs when there is a disruption in the combustion process, typically caused by a backflow of combustible gases, leading to the flame moving upstream toward the source of fuel. Flashbacks can present significant safety hazards, especially in situations where gases are delivered under pressure, making it crucial for systems to have proper safety measures in place to prevent this occurrence.

Understanding flashback fires is important to ensure the proper design and operation of equipment that handles flammable gases. Systems often use safety mechanisms such as flame arrestors or checks valves to prevent these dangerous backflows and protect facilities from potential explosions or fires arising from flashback events. The other options do not accurately define flashback flames; for example, flames that burn without oxygen or occur outside the intended combustion area do not capture the essence of the flashback phenomenon.