Minnesota Boiler License Practice Exam

What is the Maximum Allowable Working Pressure (MAWP) for a low-pressure boiler?

1. 10 psi

2. 15 psi

3. 30 psi

4. 100 psi

The correct answer is: 15 psi

The Maximum Allowable Working Pressure (MAWP) for a low-pressure boiler is typically defined as a pressure not exceeding 15 psi. This standard is important because it identifies the operational upper limit for safe and efficient boiler function within the low-pressure classification. Understanding MAWP is essential for proper boiler operation and maintenance, as exceeding this pressure can lead to safety hazards including potential boiler failure or accidents. Low-pressure boilers are designed for specific applications that do not require high-pressure steam or hot water, such as heating systems in residential buildings and some industrial settings. Keeping the pressure at or below 15 psi ensures that the boiler operates within its safe design limits, complying with regulations and reducing the risk of dangerous failures. In contrast, the other options refer to pressures that exceed the low-pressure classification, which could apply to higher-pressure boilers or systems requiring different operational standards. This distinction is crucial for ensuring compliance with safety codes and practices in boiler operation.