Tennessee Wastewater Operator Practice Exam

What do flame arresters protect against?

1. Explosions

2. Backflash fires

3. Combustion gases

4. Fire hazards

The correct answer is: Backflash fires

Flame arresters are devices specifically designed to prevent backflash fires, which occur when a flame from a fire travels back through a pipe or vent to an upstream source, potentially causing an explosion or further fire. They accomplish this by allowing gas to pass through while extinguishing any flame attempting to return through the device, thus protecting the system from fire spreading in the wrong direction. While flame arresters do provide some level of protection against hazards associated with fire and combustion gases, their primary function is defined by their ability to stop these backflashes effectively. This distinction is crucial, as it clarifies their specific application and operational purpose within combustion and gas handling systems. Other options may refer to broader categories of fire safety, but the unique role of a flame arrester is in combating the potential dangers posed by backflash fires.