Plant Operation Practice Test

What can cause a furnace explosion?

1. An excess of fuel

2. Improper ventilation

3. An accumulation of combustible gases

4. Low operating temperature

The correct answer is: An accumulation of combustible gases

A furnace explosion can occur due to the accumulation of combustible gases, which creates a hazardous situation. When these gases build up without proper ventilation or management, they can reach a concentration that makes them highly flammable. If an ignition source is introduced—such as a spark or open flame—this can lead to a rapid combustion reaction, resulting in an explosion. In contrast, while an excess of fuel can contribute to an unsafe environment, it is often the result of improper combustion management rather than the sole cause. Improper ventilation can create a similar risk by preventing gas from dispersing, but the specific cause of an explosion relates to gas accumulation that reaches a critical mass for ignition. Low operating temperature, while potentially affecting the efficiency of the combustion process, does not directly lead to explosive conditions. Thus, understanding the importance of preventing the buildup of combustible gases is crucial for furnace safety and avoiding catastrophic failures in operation.