Minnesota Boiler License Practice Exam

On a low-pressure boiler, over what square footage do you require two safety valves?

1. 100

2. 200

3. 500

4. 750

The correct answer is: 500

In the context of operating low-pressure boilers, regulations specify that when a boiler exceeds a certain size in terms of heating surface area, additional safety measures must be in place to ensure safe operations. Specifically, for low-pressure boilers, if the heating surface exceeds 500 square feet, a second safety valve is required. This is to provide redundancy; in the event that one valve fails or becomes inoperable, the second valve can still function to relieve pressure, ensuring the safety of the system and preventing potential accidents. Understanding the importance of safety valves in boiler systems is crucial. These valves are designed to open automatically when the pressure exceeds a predetermined limit, allowing steam or water to escape, thereby reducing the pressure within the boiler. The necessity of having two valves when the surface area surpasses 500 square feet enhances safety protocols, ensuring that operators can manage pressure levels effectively and maintain safe operating conditions. In contrast, boilers with smaller heating surface areas have lower risk profiles and typically do not require multiple safety valves.