Safety, Emergency Procedures, and Accident Prevention
This domain focuses on recognizing hazards and responding correctly. Know the major hazards: overpressure, low water, flame failure, fuel leaks, steam and hot-water burns, electrical shock, and confined-space entry. Understand that low water is one of the most dangerous conditions-if the water level is not visible, secure the fuel immediately and do not add water to a hot, overheated boiler until it has cooled, to avoid a violent steam surge.
Know emergency responses: on flame failure or fuel leak, shut off fuel and ventilate; on overpressure, confirm the safety valve functions and reduce firing; on a steam leak, isolate and keep personnel clear; on a fire, use the correct extinguisher and alarm. Confined-space entry requires testing for oxygen, combustible gas, and toxic gas, plus an attendant and permit. Personal protective equipment, lockout/tagout, and housekeeping prevent most accidents.
Traps: adding water to a boiler with a low-water condition that may have uncovered hot metal; assuming a gauge glass showing no water is safe to refill immediately; entering a boiler without a permit; and using water on an electrical or oil fire. Questions often test the first action-usually secure fuel and alert others.
Rule of thumb: when in doubt, secure the fuel, protect people, and get qualified help before touching the equipment.