What is an ABC fire extinguisher used for?
ABC Fire Extinguishers. They use monoammonium phosphate which is a dry chemical that is able to quickly put out the fire. It is a pale yellow powder that is able to put out all three classes of fire; Class A for trash, wood and paper, Class B for liquids and gases, and Class C for energized electrical sources.
Carbon Dioxide fire extinguishers extinguish fire by taking away the oxygen element of the fire triangle and also be removing the heat with a very cold discharge. Carbon dioxide can be used on Class B & C fires. They are usually ineffective on Class A fires.
- There are four classes of fire extinguishers – A, B, C and D – and each class can put out a different type of fire. Multipurpose extinguishers can be used on different types of fires and will be labeled with more than one class, like A-B, B-C or A-B-C.
- There are 3 classes of common fires and 2 specialty classes. Fires are classified into 5 groups: CLASS A: Class A fires involve common combustibles such as wood, paper, cloth, rubber, trash and plastics. They are common in typical commercial and home settings, but can occur anywhere these types of materials are found.
- Carbon dioxide extinguishes work by displacing oxygen, or taking away the oxygen element of the fire triangle. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well.
A simple fire extinguisher training technique to use with employees is the PASS method:
- PPull the pin on the extinguisher.
- AAim the hose nozzle low toward the base of the fire.
- SSqueeze the handle to release the extinguishing agent.
- SSweep the nozzle from side to side at the base of the flames until extinguished.
- Pull the pin or ring that unlocks the fire extinguisher's operating handle, and aim the extinguisher at the base of the fire. Aim at the fire from 6 to 8 feet away. Squeeze the extinguisher lever to discharge its contents, and sweep the hose back and forth until the extinguisher is empty.
- Steps to put out a grease fire:
- Turn off source of heat (burner / element).
- Do NOT pour water on it.
- Let me say that again, DO NOT pour water on it.
- Attempt to remove all oxygen from the flame. You can cover with another pot, or baking pan.
- If you can't cover it, dump baking soda (lots of it) on it.
- A AIM. Aim low, pointing the extinguisher nozzle (or its horn or hose) at the base of the fire. Stand approximately 8 feet away.
Updated: 2nd October 2019