Which of the following is critical for preventing boiler explosions?

Regularly checking safety valves and pressure relief mechanisms is fundamental for preventing boiler explosions because these components are essential for maintaining safe operating pressure within the boiler. Safety valves are designed to automatically release pressure when it exceeds a predetermined limit, thereby preventing an overpressure situation that could lead to a catastrophic failure, such as an explosion. Additionally, pressure relief mechanisms ensure that the boiler operates within safe limits, and regular inspections help identify any potential malfunctions before they become serious issues.

In contrast, operating the boiler continuously without checks can lead to undetected problems that could escalate, while ignoring audible alarms may prevent operators from being alerted to dangerous conditions. Similarly, replacing water without checking levels can result in inadequate water supply, posing a risk of overheating and boiler damage. Thus, the practice of routinely inspecting safety valves and pressure relief mechanisms is a critical element of boiler safety protocols.