Arkansas Boiler Operator Practice Exam

Which of the following is NOT a required safety feature on a steam boiler?

1. Blow-down valve

2. Pressure gauge

3. Float switch

4. Low water cut-off

The correct answer is: Float switch

A float switch is not a required safety feature on a steam boiler, although it can be beneficial in certain systems. The key safety features that are commonly mandated include a blow-down valve, pressure gauge, and low water cut-off. A blow-down valve is essential for maintaining water quality in the boiler by allowing operators to expel sediment and impurities that accumulate in the water. A pressure gauge is crucial for monitoring the pressure levels within the boiler system, ensuring they remain within safe operational limits to prevent overpressure conditions which can lead to catastrophic failures. The low water cut-off serves as a vital safety mechanism that automatically shuts off the boiler if water levels fall below a safe threshold, preventing damage to the boiler and reducing the risk of steam explosions. While a float switch may provide additional safety measures by monitoring water levels, it is not universally required as the other features are, which is why this option stands out as not being a required feature.