Question 503Steam Plants - Assistant Engineer

You are correct, the answer A) Secure the fuel oil to that boiler is the correct action to take first. When the water level in a boiler rapidly falls out of sight, it indicates a potentially dangerous situation where the boiler could overheat and potentially rupture. Securing the fuel oil supply to that boiler is the first critical step to prevent further escalation of the issue and potential catastrophic failure. The other options, while potentially relevant in this situation, are not the appropriate first action. Securing the steam stop (B) or raising the feed pump pressure (D) come after securing the fuel supply. Blowing down the gage glass (C) may help diagnose the issue, but does not address the immediate risk of the dropping water level.