Class 5 Boiler Practice Exam

How many low-water fuel cut off devices are required for automatically fired high pressure steam boilers?

1. One

2. Two

3. Three

4. Four

The correct answer is: Two

For automatically fired high-pressure steam boilers, it is required to install two low-water fuel cut-off devices as a safeguard. This specification is in place to ensure an additional layer of safety in the boiler operation. The primary purpose of low-water cut-off devices is to prevent the boiler from operating when the water level falls below a safe threshold, which can lead to overheating and potential failure of the boiler. Having two cut-off devices serves as a redundancy measure. If one device fails, the other can still function to halt the fuel supply to the burner, effectively preventing damage and hazards associated with low water levels. This adherence to safety standards is crucial for the safe operation of high-pressure steam systems since they operate under significant stress and conditions that could lead to emergencies if not properly managed. Therefore, the requirement of two low-water fuel cut-off devices is a critical aspect of boiler safety protocols.