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For four 20 million BTU input hot water boilers connected to the same common header, which license is required?

  1. Chief A

  2. Only Chief A or B

  3. Chief A, B, or C license

  4. Any licensed engineer

The correct answer is: Chief A, B, or C license

In Minnesota, the licensing requirements for operating boilers are determined based on the combined output capacity of the systems being managed. In this particular scenario, there are four hot water boilers each with an input capacity of 20 million BTUs. When these boilers are connected to a common header, their outputs are aggregated. This results in a total capacity of 80 million BTUs. The significance of this total output is that it exceeds the thresholds set forth by the Minnesota Department of Labor and Industry. Specifically, the Chief A, B, or C licenses are all categorized to handle different capacity limitations. A Chief A license is necessary for the operation of high-capacity systems, while B and C licenses allow for the operation of lower capacity systems. Given that the combined capacity of 80 million BTUs requires a higher level of operational knowledge and adherence to safety and maintenance protocols, any of the Chief licenses—A, B, or C—would meet the requirements. Hence, the answer indicates that a Chief A, B, or C license is suitable for a system of this capacity, ensuring the operator is qualified to manage the associated safety and technical challenges involved with operating such equipment effectively and responsibly.