What is an action you should avoid during a boiler startup?

Filling the boiler to the normal operating water level (NOWL) should be approached with caution during startup procedures because this can create potential risks if not done properly. The boiler should only be filled to the NOWL after verifying that the system is free of any air lock conditions and that it is safe to proceed. If a boiler is filled too early in the startup process, there may still be residual gases or incorrect conditions within the system that could lead to unsafe operating conditions, such as explosive reactions if there are still flammable vapors present.

On the other hand, checking the safety valves, purging the combustion air system, and inspecting the gauge glass are all critical steps that ensure safe operation. Checking the safety valves is essential for confirming that the pressure relief system will function properly in case of overpressure. Purging the combustion air system helps in clearing out any unburned gases that could pose an explosion risk. Inspecting the gauge glass ensures that the water levels are monitored accurately, which is vital for safe operation. These actions contribute to enhancing safety during the startup of a boiler.