How a boiler drum gauge glass taken in line?

A boiler drum gauge glass is taken in line by installing it vertically along the side of the boiler drum, enabling direct observation of the water level inside the drum. The gauge glass is connected to the drum through isolating valves, which allow for maintenance without draining the boiler. Typically, it features a transparent glass tube that provides a clear view of the water level, and it may have additional features like a sight glass valve for safety. Proper installation ensures accurate readings and safe operation of the boiler system.