Emergency Procedures and Accident Prevention
Low water is the signature emergency
If the gauge glass shows water below the lowest safe level, secure the fuel immediately and do not feed water into hot, uncovered metal. If water is still visible in the glass but low, restore level cautiously while reducing firing. If the glass is empty and the boiler is hot, shut down and let it cool before adding water; feeding a dry hot boiler can cause a violent collapse. Then find the cause - a failed feed pump, a stuck valve, a false indication, a tripped cutoff - before restarting.
Other emergencies
High water or carryover: reduce firing, blow down to normal level, watch for water hammer in steam lines. Tube or fitting failure: shut off fuel, isolate the boiler from the header, keep water in it if safe, and clear the area. Furnace puffback or explosion: never relight a hot furnace without a full purge; treat a fuel-rich furnace as an imminent explosion hazard. Overpressure: the safety valve should lift; if pressure rises with the valve stuck, shut down and cool. Power failure: fuel valves should close, flame safeguard locks out, and the boiler must be restarted from a full sequence. Fuel leak or gas odor: stop all ignition sources, ventilate, and follow facility emergency procedures.
Prevention and reporting
Emergency preparedness means knowing valve locations in the dark, having a written procedure, and drilling it. Report accidents, failures, and unsafe conditions promptly per facility procedure and the New Jersey rules; do not restart a boiler involved in an explosion or serious failure until it has been inspected and cleared by an authorized inspector.
Rule of thumb
When in doubt: stop the fuel, keep people clear, and start the sequence over. No boiler ever needs to keep firing badly enough to justify a risk.
Worked example
A boiler trips on low water during a feed-pump failure. Correct order: burner off and fuel valves closed, feed pump isolated to prevent a slug of cold water, header stop valve closed if pressure is unstable, then investigate and log.