Minnesota Special Engineer Boiler License Practice Exam 2026 - Free Boiler License Practice Questions and Study Guide

The pressure gauge is the device specifically designed to monitor the pressure in a steam boiler. It provides a visual indication of the steam pressure within the boiler system, which is critical for ensuring safe and efficient operation. By displaying the current pressure, the gauge allows operators to make informed decisions about boiler performance, maintenance, and safety measures.

The other devices serve different purposes. An expansion tank is used to accommodate the thermal expansion of water in a hydronic heating system. Tricocks, which are usually employed in steam boilers, allow for the checking of the water level but do not measure pressure. The safety valve is an essential safety device that automatically releases pressure if it exceeds a predetermined limit, thus preventing potential hazards from overpressure, but it is not used directly to monitor pressure levels. Understanding the function of these devices highlights the specialized role of the pressure gauge in boiler management.