Class 5 Boiler Practice Exam

Why are low water cutoffs used in steam boilers?

1. To indicate water levels

2. To prevent overheating

3. To shut down the boiler in case of low water level

4. To manage pressure release

The correct answer is: To shut down the boiler in case of low water level

Low water cutoffs are devices installed in steam boilers primarily to ensure safe operation by shutting down the boiler in the event of a low water level. If the water level drops below a predetermined threshold, the low water cutoff activates and interrupts the burner operation, preventing the boiler from running without sufficient water. This is crucial because operating a boiler with insufficient water can lead to overheating, potential damage to the boiler components, and even hazardous situations such as explosions. While the cutoffs do contribute to overall safety and indirectly assist in maintaining appropriate temperature and pressure levels, their primary purpose is specifically to monitor and respond to low water levels. Hence, their function is not just about indicating water levels, preventing overheating, or managing pressure release, but more critically about taking immediate action to protect the boiler from the adverse effects associated with low water conditions.