Prevention is better than the cure.Whilst a simple concept, the fire triangle is a scientific principle that is important for all people to be aware of. Understanding how fires sustain themselves is essential background information in situations where you may have to use fire safety equipment.
The Fire Triangle ExplainedWe will be summarising the fire triangle, and the lesser known fire tetrahedron, in order to give you vital insight into what maintains a fire.
What is the Fire Triangle?The fire triangle is the three components needed to ignite and sustain a fire. The three ingredients of a fire triangle are; heat, fuel and oxygen. If just one of these components is removed, the fire triangle will collapse and the fire will be extinguished.
Let’s explore these components in more detail.
Fire Triangle Facts
- Normal air contains 21% oxygen.
- Fuel may also contain oxygen.
- Heat sources include: the Sun, hot surfaces, sparks, friction and electrical energy.
- Fuel sources can be a solid, liquid or gas.
What is the Fire Tetrahedron?The fire tetrahedron is a slightly more complex model to describe the components needed to ignite and sustain a fire. It is a four-sided geometric representation of the four factors necessary for fire:
- Fuel – any substance that can combust.
- Heat – heat energy sufficient to cause ignition.
- Oxidizing agent – air containing oxygen.
- Chemical chain reaction – sufficient reaction energy to produce ignition.
Fire Tetrahedron Explained
The fire tetrahedron includes the three components covered in the fire triangle, with the addition of a chemical chain reaction.
This model is simply adding another dimension onto the traditional fire triangle model by treating the chemical reaction as its own separate component. Some fire extinguishers work by applying extinguishing agents to the fire to inhibit the chemical reaction on a molecular level.
Steps to take if there’s a fire in the workplace.It is critical for the residents to make sure that they are aware of the fire safety plans and procedures in place, along with the location of fire extinguishers and escape routes. They should familiarise themselves with the below tips about what to do if ever there’s a fire in the workplace.
Step 1 – Raise the AlarmAnyone discovering a fire should raise the alarm immediately, regardless as to how small the outbreak is or how innocuous it appears to be. Fires can develop very quickly and every second counts.The Fire & Rescue Service should be called (at 199), with the name, address and full postcode of the property given clearly, along with any helpful information such as the fire type and location.
If the alarm has sounded automatically, assigned office fire marshals should investigate the alarm condition as everyone else evacuates the building. If it is a genuine fire condition, and if the fire is small and manageable (about the size of a waste paper bin on fire), and the appropriate type of fire extinguisher is available, then somebody may attempt to extinguish the fire, but only if they have been trained to do so.You can see below “How to Use a Portable Fire Extinguisher” for instructions.
They should make sure that their escape route is never compromised by the fire, as well as ensuring they are confident that they understand the fire type and adjacent risks. Similarly, they should retreat if, despite their best efforts, the fire continues to grow. Fire marshals will “sweep” their designated areas of the building to ensure that everyone is out safely.
- Raise the alarm.
- Call the Fire Service.
- Fire Marshals should check escape routes.
Step 2 – EvacuateEvacuation should be prompt and calm, with everyone making their way to exit.You should shut own any hazardous machinery or processes in line with the fire evacuation procedure for the site.
Do not stop to collect any personal belongings.Never use lifts in the event of a fire – this is because the lift could stop working, trapping you inside, or the doors could open on the afflicted level and expose the occupants to flames, heat and toxic gases.
Head directly to the nearest emergency fire exit. Put your hand against any doors you go through to check that the fire is not on the other side. The last person out should try to close doors behind them to prevent the fire spreading through the building’s “fire compartments” and also to reduce the level of oxygen available in any room to feed the fire.
If the escape route is affected by smoke, drop down onto the ground and crawl, as the available air will be cleaner closer to the ground.
- Be prompt and calm.
- Turn off any hazardous machinery.
- Do not stop to collect personal belongings.
- Head to the nearest fire exit.
You should not re-enter the building until told to do so by an attending Fire Officer.
If You Become Trapped InsideTry and get to a room with a window.
If you’re on the first floor, open a window and lower yourself to arm’s length, then drop to the floor.
Never jump from a window and make sure to first throw down some soft materials onto the ground outside.
If you’re too high up to attempt this, then use the window to call for help and also call 199.
Block the gaps under doors with materials such as clothing, bedding, towels etc. to prevent smoke from entering.
If your clothes ever catch fire, don’t run around as this will fan the flames; instead, remember:
Workplace Fire Safety Checklist
- Fire detection and alarm system
- Alarm tests are conducted regularly
- Fire safety procedures *Consider number of employees, visitors and people with disabilities, while designing escape routes and plans
Fire Safety Equipment
- Fire extinguishers
- Emergency lighting and signage
- Placed evacuation plans
- Electrical system checked and maintained regularly to apprehend faults before they become a problem
- Combustible materials stored away safely in well-ventilated areas
- Ovens, microwaves and stoves cleaned regularly
- No flammable items are housed near hot surfaces
- Appliance cords are not left trailing or dangling
How to Use a Portable Fire ExtinguisherWatch this video created by the Fire Equipment Manufacturers’ Association to learn how to assess a potential fire situation and use a portable fire extinguisher in the event of a fire emergency.
Remember P.A.S.S. technique
- Pull the pin
- Aim the nozzle
- Squeeze the levers
- Sweep from side-to-side