Minnesota Boiler License Practice Exam 2025 – All-in-One Guide to Passing with Confidence

In a boiler plant with two 250 horsepower boilers connected to the same common header, a second class engineer's license is needed because this type of license allows an engineer to operate and manage boilers with a total capacity rating that falls within the parameters set by licensing regulations. In Minnesota, a second class license typically covers boiler operations with a combined input rating of 500 horsepower.

This requirement is designed to ensure that operators have the necessary knowledge and skills to manage boiler operations safely and efficiently. Those holding a second-class license are trained to handle operational duties such as maintaining proper pressures and temperatures, ensuring safety protocols are followed, and conducting regular maintenance checks.

On the other hand, a Chief engineer’s license or a First class engineer’s license would not be necessary unless the total horsepower capacity exceeded the limits dictated by the second class license or if more complex and higher capacity systems were in operation. A Special engineer's license usually pertains to specific types of boilers or systems that do not require a full second class certification. Thus, the second class engineer's license is the appropriate level for the situation described in the question.