Gas Heat ESCO Practice Exam

Flashback indicates

1. excessive gas pressure

2. gas velocity is slower than the speed at which the gas can burn

3. gas velocity is faster than the speed at which the gas can burn

4. normal operation of the gas system

The correct answer is: gas velocity is slower than the speed at which the gas can burn

Flashback occurs when the flame travels back into the burner or fuel supply line, generally indicating a problem with the combustion process. When gas velocity is slower than the speed at which the gas can burn, it can lead to incomplete combustion and the potential for the flame to move backward into the system. This scenario suggests that the gas is not being discharged at a sufficient rate to maintain a stable and controlled burn at the burner, leading to the flame potentially moving backward against the gas flow. This understanding highlights the importance of proper gas velocity in ensuring safe and efficient operation of gas systems. When gas is burned at the appropriate velocity, it maintains a stable flame and minimizes the risk of flashback, whereas slower velocities can create hazardous conditions.