The aim of any safety plan is to create an environment where there are no fires. But if there is a fire then it is a small and contained one and extinguished by a competent and trained staff member or occupant. Let’s have a look at some fire extinguisher types in Australia. Which are very similar to those used around the world in developed countries.
Even though this article may be designed to refresh knowledge and give confidence to the user or fire warden. There are significant opportunities for new users to learn from this article. Such training may equip the user with skills to stay and defend where a fire has occurred.
Types of fire extinguishers in Australia
The water extinguisher
The first one we will cover is the water fire extinguisher. All extinguishers are red and this one has a label which is red and would be used for fire involving carbonaceous materials like paper, wood, plastics and the like. Also known as class “A” fires.
The action of this extinguisher removes the heat from the fire triangle by cooling the burning product. Water conducts electricity and therefore should not be used where there is a risk of electric shock.
The carbon dioxide extinguisher
Again a red extinguisher but this time has a black band indicating that it is in fact a carbon dioxide extinguisher. It is safe to use on electrical fire where the water extinguisher was not safe. It will not give you a shock as it does not conduct electricity and generally will not damage the equipment you are using it on.
Prior to using this extinguisher it is always a good idea to turn off the supply of electricity if safe to do so. These extinguishers also have limited effect on a class “B” or flammable liquid fire. They should be used with extreme caution as the fire may reignite if the flames have been extinguished. A CO2 extinguisher puts out the fire by smothering or displacing the oxygen and therefore shouldn’t be used in a small or confined space. If this precaution isn’t observed the user may be overcome by the lack of oxygen in the surrounding environment.
They can also unsettle the untrained or not confident user as as the suppressant exits the extinguisher it creates a very loud noise. Therefore during training it is advisable that hearing protection is used.
The golden rule is to place the discharge horn at ninety degrees to use and not touch is again while in use. As the CO2 is expelled the discharge horn will become very cold and this can cause nasty cold burns to exposed skin.
The foam extinguisher
The next extinguisher we will talk about is the foam extinguisher. It is generally red with a blue label. Even so, there are some older types around that are totally blue. This extinguisher is generally used for class “B” or flammable liquid fires and is water based. Due to this fact it can be quite effective on class “A” fire also.
With flammable liquid fires, for which it is generally designed, it puts a layer of foam over the burning liquid thus stopping the vapour release. In all flammable liquid fire it is the vapour that is burning. So because the vapour has been stopped from being released the fire can’t continue thus going out quite rapidly.
Because the foam extinguisher is water based it must not be used on electrical fires.
The Dry chemical or powder extinguisher
This red extinguisher with a white band is probably the most versatile extinguisher, but again does have some limitations.
It is not water based and therefore is suitable for electrical fire as it should not conduct electricity. It can be used on carbon based fire as will as flammable liquids. There is always the possibility of re ignition as it will not cool the burning material. The powder itself will supply a very small amount of smothering. I.e. isolating the oxygen from the fuel, but generally works on the chemical chain reaction or flame.
In every flame there are a number of unmatched electrons which fly around releasing energy, thus the flame. What the dry chemical extinguisher does is provide matching electrons for those unmatched and the flame goes out. This could be said to have stopped the chemical chain reaction.
It is still important to note that there is no cooling provided so burning could recommence if the fuel is at its ignition point.
Let’s now look at raising the alarm of fire
The most important thing to do in the event of discovering a fire is to raise the alarm by using an appropriate communications method. Thus it is important to follow the general fire orders which are generally located in a prominent position near new firefighting equipment or an evacuation plan.
Now using a fire extinguisher to extinguish the fire. It is important that a fire extinguisher is only used if safe to do so and operated by a trained and confident person. The first time you use a fire extinguisher shouldn’t be in a real emergency situation.
Ensure the fire is within the capability of the fire extinguisher which means it should be relatively contained and not getting too big, i.e. in a rubbish bin. Also, if it is very smoky make sure that you do not enter the smoke as often the gasses given off by a fire can be deadly and your life and others may be put in real danger. Lastly make sure that you have the appropriate extinguisher for the situation. If the fire was a result of an electrical hazard then a water extinguisher would be very dangerous.
Escalating emergency situation
There is a need to recognise that an escalating emergency situation will not hinder your evacuations if required . So before starting the fire attack make sure you are between the fire and an exit and that it is clear. If there are any doubts, get out.
When you have considered all of the safety issues and any others mentioned about you can then use the extinguisher to attack the fire using the pass method.
PASS is an acronym that provides the sequence for using the equipment. Each letter stand for the following:
- P = Pull the pin
- A = Aim at the base of the fire
- S = Squeeze the trigger slowly
- S = Sweep from side to side.
Also remember to test the extinguisher as you approach the fire. You do not want to get within fighting distance and realise the extinguisher is unserviceable.
Hopefully this has refreshed your memory. Even so, it is important that you are trained and confident with the use of firefighting equipment. Generally, required under the building code of Australian in a facility/ business. Equipment provided for occupant use is very simple to use but if not used appropriately can place the user in a dangerous situation. Imagine the potential result of using an extinguisher on an electrically energised fire. Good Luck.