If it has been determined that a steam boiler burner is on and the water gauge glass indicates no water, what should be done immediately?

When a steam boiler burner is operating and the water gauge glass shows no water, the immediate course of action should be to shut off the fuel supply. This action is critical because a burner operating without sufficient water in the boiler can lead to overheating and potentially catastrophic failure, such as a boiler explosion. The lack of water means that the boiler may be at risk of dry firing, which can damage components and create hazardous conditions.

By shutting off the fuel supply, you effectively stop the burner from operating and prevent further heating of a boiler that may be low on water. This is a key safety procedure that helps to protect both the equipment and personnel in the vicinity. Addressing the issue of low water in the boiler should follow afterward, including examining the reason for the water loss and ensuring the boiler is safe to operate once the water levels are restored.

Opening the water supply, notifying the building owner, or adjusting high pressure limit controls are important but should come after ensuring that the burner is off. Immediate action to cut off the fuel supply takes precedence to safeguard against immediate risk.