Plant Operation Practice Test

Which of the following can cause a furnace explosion?

1. A buildup of combustible gases or vapor

2. Improper furnace purge

3. Leaking gas or fuel oil

4. All of the above

The correct answer is: All of the above

Furnace explosions can occur from multiple causes, and it is essential to recognize that a combination of factors can contribute to such dangerous incidents. Each of the scenarios outlined has the potential to create conditions that lead to an explosion. A buildup of combustible gases or vapors is a primary concern since an accumulation of gas in an enclosed space can create an explosive environment. If these gases find an ignition source, they can ignite suddenly and forcefully, leading to an explosion. Improper furnace purge procedures can also lead to an explosive atmosphere. Before ignition, it is crucial to clear any unburned gases from the system. If this step is neglected or performed incorrectly, explosive gas concentrations can remain in the furnace. Leaking gas or fuel oil presents another serious risk. Even minor leaks can lead to dangerous concentrations of flammable materials. When combined with an ignition source, these leaks can result in catastrophic explosions. Recognizing that all these factors—combustible gas buildup, improper purging, and leaking fuels—can independently or collectively create explosive risks is crucial for understanding furnace safety and operation. Hence, all the options contribute to the potential for a furnace explosion.