Intermittently blowing off a steam boiler is primarily done to:

Intermittently blowing off a steam boiler is an essential maintenance practice that helps keep the system operating efficiently and safely. The primary reason for this procedure is to discharge sediment and scale-forming matter from the boiler.

Over time, impurities in the boiler water, such as minerals and other debris, can accumulate at the bottom of the boiler. If not regularly removed, these sediments can lead to various problems, including reduced efficiency, increased fuel consumption, and potential damage to boiler components. By blowing down the boiler, operators can remove this buildup, ensuring that the system maintains its operational integrity and efficiency.

While other processes in boiler maintenance such as cleaning the firebox or controlling water chemistry are important, the blow-off procedure specifically targets the removal of sediment and scale, which are critical in maintaining proper boiler function and safety. This focus on sediment removal directly supports the longevity and reliability of the boiler system.