Where is the bottom of the water column connected on an HRT boiler?

In an HRT (Horizontal Return Tube) boiler, the bottom of the water column is properly connected 6 inches below the center of the drum. This connection height is crucial because it ensures that the water level can be accurately maintained and allows for the effective measurement of the water level in the boiler. Establishing the bottom of the water column at this specific height helps prevent any potential issues related to water column dynamics that could impact boiler operation.

The choice of 6 inches below the center is designed to accommodate the operational needs of the boiler while ensuring sufficient pressure and stability in the water supply. This setup aids in maintaining the correct water level and allows operators to monitor and adjust water levels effectively during operation, contributing to both safety and efficiency.

Other potential connection points, like at the center of the drum or at the bottom of the sight glass, could lead to inaccuracies in water level readings or insufficient water supply, which may negatively impact boiler performance. Similarly, connecting at the top of the steam shell would not allow for the correct functioning of the water column since it would not properly indicate the water level in the boiler.