Massachusetts Oil Burner License Practice Test

If a steam boiler is installed with an automatic feeder, what is also required?

1. A pressure relief valve

2. A backflow prevention device

3. An air bleed valve

4. A safety shut-off switch

The correct answer is: A backflow prevention device

When a steam boiler is equipped with an automatic feeder, it is necessary to include a backflow prevention device to protect the water supply system from contamination. The automatic feeder adds water to the boiler to maintain the desired level, and if there's a drop in pressure or any disturbance, there's a risk that boiler water could potentially flow back into the potable water supply. A backflow prevention device prevents this backflow, ensuring the integrity of the drinking water supply and adhering to plumbing codes and safety practices. The requirement for a backflow prevention device emphasizes the importance of maintaining safe water standards, as contaminated water from a boiler could pose serious health risks. Thus, the inclusion of this device is a critical safety measure for installations involving automatic feeders.