When the gauge glass is broken, how is the water level checked?

Using the tricocks is the correct method for checking the water level when the gauge glass is broken. Tricocks, or three-way cocks, are valves connected to the boiler that allow operators to obtain an indication of the water level from different points. By opening these valves, personnel can check the water level visually in a safe manner, as they provide an alternative method to confirm water levels without relying on the potentially faulty gauge glass.

This method ensures that operators can safely assess the situation while minimizing risks associated with boiler operation during a gauge glass failure. The use of tricocks allows for real-time readings, enabling timely reactions in maintenance or operational adjustments.

Other methods, such as blowing down the glass or the water column, may not provide the same level of accuracy or safety, especially after glass breakage. Securing the boiler during repairs is essential for safety but does not aid in determining the water level; rather, it's part of a precautionary process when repairs are necessary.