Fire Extinguishers At Work
Continuing Education Units (CEU): 0.10
Expected Duration: 1 Hour
This self-paced online course covers workplace fire extinguishers, including the A, B, C and D types of fire extinguishing agents.
Upon completion you should be able to:
- Understand the different classes of fires
- List and understand the different types of extinguishing agents
- Operate all basic types of extinguishers and the technique for safe use
Who Will Benefit
Anyone whose job involves designing, reviewing, evaluating or installing fire protection systems, including: designers, installers, engineers, electrical contractors, technicians, project managers, fire marshals, and architects.
- Used properly, portable fire extinguishers can be effective fire fighting tools in the early stages of a fire. However, if you discover a fire, the first thing you must do is sound the alarm. Do not attempt to do anything else until youâ€™re sure the fire department is being notified and people are evacuating the building.
- For firefighting purposes, fires are divided into different classes; these will present different hazards, and require different types of extinguishers:
- Class A - ordinary combustibles
- Class B - flammable and combustible liquids; flammable gases
- Class C - fires involving energized electrical equipment
- Class D - combustible metals
- Class K - combustible cooking oil or fat
- Fire extinguishers contain extinguishing agents, the material that actually does the work in putting out the fire. These agents may be in the form of a liquid, gas, gas/mist, foam or dry chemical. They put out the fire in different ways.
- Water is a very effective extinguishing agent for fires in ordinary combustibles (Class A). It works by cooling the fire.
- Dry chemical extinguishers are very popular, and multipurpose: they are rated either Class B, C, or Class A,B,C. They work by interrupting the chemical chain reaction of the fire.
- Foam extinguishers are also multipurpose, rated Class A, B; they work by smothering the fire. Note that because they are water-based, foam extinguishers are not rated for fires in energized electrical equipment (Class C).
- Carbon dioxide is a multipurpose extinguishing gas, rated Class B,C. It works by displacing air, depriving the fire of oxygen.
- Halogenated agents, rated Class B, C, also work by interrupting the chemical chain reaction. Unlike dry chemical extinguishers, they do not leave a corrosive residue, and so are preferred in areas containing delicate electronic equipment.
- Dry powder agents are rated Class D. They smother the fire.