What action is commonly used to start the flow of gases in burner management systems?

In burner management systems, starting the flow of gases typically involves the process of purging. Purging is essential for ensuring that any combustible gases or vapors present in the burner and associated piping are safely removed before ignition occurs. This process decreases the risk of explosive mixtures forming, as it helps to clear out unburned fuel and ensures that fresh air is introduced into the system.

The purging action typically uses air or an inert gas to ventilate the system effectively. This step is critical because if ignition were to take place without proper purging, it could lead to dangerous conditions, including flashbacks or explosions.

Once purging is complete and the system is clear of any hazardous gases, the burner can safely proceed to the next steps, such as trial for ignition, where ignition is ignited and monitored to confirm operational safety. However, it is the initial purge that lays the groundwork for safe and effective burner operation.