To understand just how to prevent fires, it is crucial to know exactly how a fire have the right to occur. Four aspects must be present at the exact same time for a fire to take place:

Fuel or combustible product - something to burn, such as record or wood. Heat - to raise the product to that is ignition (burning) temperature. Oxygen - to sustain combustion (the fire). Chemistry reaction - the procedure of burning.

You are watching: A typical self-expelling fire extinguisher empties its contents in

If you remove any of these four elements, the fire will certainly not have the ability to burn.

Never struggle a fire if:

You execute not understand what material is burning. You carry out not know what form of fire extinguisher come use. You perform not know exactly how to usage the fire extinguisher. The fire is spreading past the spot wherein it started. Her instincts phone call you not to.

If you space not confident around your ability to handle the case (even if you are trained in fire fighting), or if you carry out not have the correct type of fire extinguisher, do not hit the fire. Pull the fire alarm, evacuate the area, and then call the fire department.

What are the different classes of fires?

Fires space grouped right into classes which rely on the product or substance that is present.

Class A - Fires including ordinary combustibles such as paper, wood, cloth, rubber, or plastics. Class B - Fires involving flammable liquids, gases, oil, paints, or lacquer. Class C - Fires entailing energized (live) electrical equipment such as motors, appliances, or power tools. Class D - Fires entailing combustible steels such together magnesium, titanium, sodium, and potassium. Class K - Fires entailing combustible cooking oils, or fats in cooking appliances.

What space the different varieties of portable fire extinguishers?

To hit the various classes that fires, there space different species of fire extinguishers. Each has its very own characteristics, capabilities, and also limitations.

Three main varieties of portable fire extinguishers include:

Water extinguishers: Water extinguishers space filled about two-thirds with water and also then pressurized v air. When supplied for class A fires, this extinguishers eliminate the heat from the burning materials.

carry out not usage water come extinguish an electrical fire. Water is a good conductor and also can boost the opportunity of electrocution. do not usage water to extinguish flammable liquid or cooking oil fires. Water is ineffective as it help to spread the liquid and also the fire.

Carbon Dioxide (CO2) extinguishers: The extinguishing media is pressurized CO2. When provided for class B and also C fires, the CO2 covers the fuel through blanketing it, and also stops the reaction at the surface by displacing oxygen. Be thorough as soon as using a CO2 extinguisher. It has a middle spray range and last just 10 to 30 seconds. A tough horn attached to the end of the spray pipe helps come contain and aim the spray at the target area.

do not use CO2 extinguishers in limit spaces as CO2 deserve to displace the oxygen in the air, making breath difficult. Only use in a confined space if workers have ideal respiratory protection. Do not usage CO2 extinguishers for class A fires due to the fact that the fire may proceed to smolder and re-ignite after the CO2 disperses.

Dry chemical extinguishers: Dry chemical extinguishers space the most usual and accessible in few types. These extinguishers will be marked for the great they are designed to extinguish (e.g., ABC kind extinguisher will placed out course A, B and also C fires). The extinguishers discharge a ceiling of fine flour which create a break in between the fuel and the oxygen in the air. The powder likewise works to break the chemical reaction. Be accurate when using together they have a quick to moderate spray variety and last just 10 come 25 seconds.

Be mindful of the residue after using dry chemistry extinguishers. The residue can damages motors, computers and also other electrical equipment.

Below is a review of these and also other typical extinguishers.

Extinguisher to compare Table Extinguisher Class variety Empties various other
Water A Long 60 sec Fights re-ignition
CO2 B and C Short 10-20 sec May make breathing complicated in enclosed areas
Dry chemistry B and also C part A Moderate 10-25 sec Leaves residue
Liquid Gas B and C part A Short 10 sec May make breathing daunting in enclosed locations
Chemical Foam A and also B Moderate 10-30 sec Leaves residue
Bucket the Sand / dry Powder D     Check through your supervisor concerning equipment for class D fire fighting
Wet chemistry K     Prevents re-ignition

Portable fire extinguisher might use the adhering to markings to indicate which class of fire they are designed come fight. This symbols are recommended by the national Fire defense Association (NFPA) in the USA. The symbols might be presented using colours.



Be certain that you room trained to usage a fire extinguisher prior to you shot to fight a fire. understand what form and class of product is burning. use the correct fire extinguisher form to fight the fire.

Remember, if you feel the you cannot safely extinguish the fire utilizing the portable extinguisher accessible and if you have not already done so, traction the fire alarm, evacuate the area, and also then call the fire department.

When making use of an extinguisher, use the PASS mechanism - Pull, Aim, Squeeze, Sweep.

Pull the pin on the extinguisher. Aim the extinguisher. Squeeze the cause or top handle. Sweep the fire area through the extinguisher"s spray till the fire is completely out.

For floor fires, sweep from the edge in. For wall surface fires, move from the bottom up.

never walk far from a fire, even if girlfriend think that is out. The residue may reignite. Constantly stand in between the escape route and also the fire for this reason you deserve to leave safe if the fire grows. If the fire grows also large, leaving the area. Activate the fire alarm to evacuate the area.

As an employer/contractor, friend must:

usage the proper size of extinguisher. Install extinguishers follow to the elevation requirements stated in your jurisdiction"s Fire Code. Locate extinguishers therefore they space readily available to employees for immediate use. Make sure that extinguishers are plainly visible, and also any location indicators are clear. Mark or brand all fire extinguishers plainly with the class of fire it is to be provided for. Make certain that the operating instructions always face outward. Keep extinguishers in a fully charged and also operable condition. Store extinguishers in the designated locations at all times (except throughout use). Visually check portable fire extinguishers monthly. usage a sign on each extinguisher that shows the dates of inspection, recharging or servicing, the name of the servicing agency, and also the surname of the human who go the service. Company portable fire extinguishers at least once a year, or when the monthly inspection shows servicing is necessary. Save written records showing maintenance items such together serial number and kind of extinguishers, location, investigate date, description of tests, date of following inspection, date of yearly servicing, comments and inspector"s signature. Only permit service by trained people with perfect testing equipment and also facilities.

Portable fire extinguishers have to be inspected at the very least monthly. Visually check for the following items. Customize this perform for your workplace.

room the fire extinguishers fine supported and also hangers are fastened solidly? are the fire extinguishers accessible? deserve to be conveniently reached There room no obstructions Location signs are clear class markings room clear operating instructions room clear are the extinguishers in good working condition? Discharge opened is clean It is completely charged It has not been damaged or tampered with Hydrostatic testing has been done Is the ring pin in place? Is the seal intact?

Extinguishers v the following conditions are have to be eliminated from service:

as soon as the cylinder or covering threads space damaged whereby there is a corrosion that has caused pitting, consisting of corrosion under removable surname plate assembles when the extinguisher has been melted in a fire

Always check with the supplier or manufacturer if you room not sure about the serviceability of the fire extinguisher.

See more: How To Say Five In Spanish And How To Say It? How Do You Say Five In Spanish

Depending upon what form of extinguisher the is, a fire extinguisher might be classified together a hazardous product under WHMIS 2015. Numerous extinguishers will fulfill the compressed gas criteria and also will because of this require a WHMIS label. Other extinguishers may likewise be classified in various other WHMIS classes due to the physics or health impacts of the extinguishing media.