At what point should you blow down the sight glass?

Blowing down the sight glass at the start of each shift is important because it ensures that any debris or buildup that may have accumulated in the sight glass is cleared away. This practice enhances the accuracy of the water level readings and helps maintain the overall safety and efficiency of the boiler system. Performing this task at the beginning of a shift allows the operator to confirm that the sight glass is functioning properly before proceeding with operations. Regular maintenance of sight glasses helps prevent potential failures and ensures proper monitoring of water levels, which is crucial for safe boiler operation. Maintaining the routine at the start of each shift establishes a consistent practice that contributes to operational reliability.