How is a gauge glass typically mounted on a boiler for better accuracy?

A gauge glass is typically mounted in a way that allows for an accurate representation of the water levels within a boiler system. When it is placed with a water column to stabilize the water level, it effectively accounts for any fluctuations or disturbances in the water level caused by steam bubbles or changes in boiler pressure. The water column acts as a hydraulic buffer, ensuring that the water level displayed in the gauge glass reflects the true water level in the boiler.

This setup is crucial for safe operating conditions, as the gauge glass provides operators with a visual indication of the water level, enabling them to monitor and maintain proper water levels to prevent issues such as boiler damage due to low water, or carryover of water into the steam system. Using a water column minimizes errors associated with rapid changes in pressure, allowing for a more stable and accurate reading.

In contrast, mounting the gauge glass directly to the boiler shell or on the bottom of the boiler may not adequately stabilize the water level readings, leading to inaccurate assessments. Attaching it to the steam outlet also does not provide a reliable measure of the water level, as steam can interfere with the readings seen in the gauge glass.