What is a common consequence of failing to secure fuel when experiencing low water conditions in a boiler?

Failing to secure fuel during low water conditions in a boiler is critical because it significantly increases the risk of an explosion. When the water level in the boiler drops too low, the remaining water can become superheated, leading to the boiler tubes overheating. If fuel continues to be supplied in this condition, it can cause severe thermal stress and potential failure of the boiler components. This overheating can eventually lead to a catastrophic failure, including explosions or ruptures, as the structural integrity of the boiler is compromised.

In contrast, fluctuating boiler pressure can occur for various reasons and is not a direct consequence of neglecting to secure fuel under low water conditions. Increased steam production is also not a direct outcome of this issue; continuing to fuel a boiler with insufficient water would not lead to increased steam production in a safe or controlled manner. Lastly, while water contamination can occur in a boiler system, it is not specifically tied to the failure to secure fuel during low water conditions. Thus, ensuring fuel is secured in low water situations is paramount for safety, making the risk of explosion the most concerning consequence.