What is the next step after ensuring the safety controls are operational during a firing cycle?

After ensuring that the safety controls are operational during a firing cycle, the logical next step is to initiate fuel flow. This process is crucial because the firing cycle requires fuel to be introduced for combustion to occur. Activating fuel flow after confirming the safety measures ensures that the boiler operates safely and efficiently, minimizing the risk of accidents or malfunctions.

Monitoring pressure gauges, opening steam valves, and checking water levels are important steps that follow or occur concurrently with fuel flow management during the firing process. However, initiating fuel flow is the critical action that directly leads to combustion and energy production within the boiler system. Without this step, the boiler would remain inactive regardless of how well the other components are functioning.