When is the recommended time to conduct a bottom blowdown of a boiler?

The recommended time to conduct a bottom blowdown of a boiler is during light loads. This timing is beneficial because the boiler is less likely to be under stress, allowing for a more effective removal of sediment and particulate matter that settles at the bottom of the boiler. During heavy loads, the sudden interruption of water flow and pressure could lead to operational issues or disturbances in the heating process. Conducting blowdowns at light loads minimizes the impact on the boiler's performance while ensuring proper maintenance and efficiency.

Other options suggest either conducting blowdowns at inappropriate times or with insufficient frequency, which could lead to the buildup of sediment and reduce the efficiency and safety of the boiler system.