When should water walls be blown down?

Blowing down water walls is an important maintenance procedure that helps to remove accumulated impurities and sludge from the water used in the system. Performing this task when the furnace is cool is crucial for safety and mechanical integrity. During operation, the presence of high temperatures and pressure can lead to dangerous conditions, potentially resulting in equipment damage or personal injury. Similarly, performing this action immediately after shutdown may still pose risks if the system has not adequately cooled down, as residual heat can still be present in the water walls. Conducting this procedure before maintenance is also not ideal because it could expose workers to hazards if the system has residual heat or pressure.

Therefore, the safest and most effective time to blow down water walls is when the furnace is cool, ensuring that the risk of burns or pressure-related incidents is minimized while facilitating proper cleaning of the water walls. This not only promotes safety but also helps maintain the efficiency and operational safety of the boiler system.