A fire suppression system is an integral part of any fire protection infrastructure. ‘Fire suppression’ is a collective term for any engineering group of units that are designed to put out a fire. This can be achieved by applying an extinguishing substance such as water, foam or chemical compounds. This article explores the range of applications within a fire suppression strategy, so site teams and building owners can begin to comply with fire safety regulations and give peace of mind to building occupants and tenants alike.
How does a fire suppression system work?
A fire suppression system will have built-in components to detect fires as early as possible. These components will first identify the presence of flames and smoke. The suppression system will then initiate an alarm, so the blaze can be subdued before it has the chance to spread. A fire suppression system can be considered an ‘active’ fire protection method because the system is triggered in response to the presence of fire. As will be explored further in this article, a fire suppression system also contains a range of components that ‘actively’ work to extinguish flames and smoke.
What is the difference between a fire sprinkler and a fire suppression system?
Both fire suppression systems and sprinkler systems can control or extinguish fires and are activated when detecting heat or smoke. A fire suppression system, however, doesn’t use water as it can be ineffective in certain types of fires. For example, a facility that uses combustible gas or oil, for instance, would not benefit from using water as a fire suppressing agent. For this reason, fire suppression systems are more common in industrial environments than traditional water sprinkler systems.
Why use an automatic fire suppression system?
Just like a traditional system, an automatic fire suppression system will consist of an element that detects heat and smoke and a suppression agent container. There will also often be a manual activation system that acts as a failsafe in the case that the automatic system isn’t triggered.
The main benefit of an automatic fire suppression system is that they eliminate the need for human activation or intervention. Not only does this reduce the risk to occupants’ safety, but it is also ideal for extinguishing fires in remote or less accessible areas of a building or estate.
Furthermore, automatic fire suppression systems are a particularly worthy investment for industries and companies containing flammable materials or high-value goods. This type of preventative measure could be looked upon favourably by insurance providers, who may reward business owners and landlords with lower premium rates for taking this type of precaution.
When is a fire suppression system required?
Automatic
Fire suppression systems should be installed in buildings where a sprinkler system may not be the most effective method of fire protection. These can include rooms that contain a large amount of electrical equipment, irreplaceable assets or perishable items that could be susceptible to water damage.
Although there are no legal installation requirements for fire suppression systems, property owners, be they commercial or residential, are responsible for arranging experts to conduct fire risk assessments. This assessment, whether conducted internally or externally, may reveal the need for a fire suppression system.
When identifying the best option for your specific needs, it’s advisable to know how both active and passive fire protection systems work in tandem to extinguish flames. This is vital for risk management, reducing the risk of structural damage as well as safeguarding a building’s occupants.
What are the different types of fire suppression?
Broadly speaking, there are five main types of fire suppression systems – all of which have unique properties and benefits based on the respective space in need of protection:
Gas systems
Gas suppression systems store fire-suppressing liquids, which are pressurised with nitrogen. These liquids contain a chemical agent called FM200, which is quickly released to immediately suppress flames. Since these systems don’t use any water, they’re particularly beneficial for rooms with large amounts of electrical equipment such as switchboards or server rooms. The gaseous agent is initially condensed in liquid form and stored in compact cylinders, making these systems easy to transport and store.
Wet chemical foam systems for kitchens
Wet chemical foam systems are specifically designed for suppressing fires in kitchens. These kitchen fire suppression systems work by quickly emitting a water-based chemical foam agent directly into a small, localised area. They are usually placed under the canopies of cookers and are activated by either a manual switch or a heat link (a link attached to a wire that breaks when exposed to heat, triggering the foam release valve).
Water mist systems
Water mist systems pose a viable fire suppression solution for spaces that cannot be exposed to large amounts of water. They work by producing droplets that are much smaller than conventional sprinkler systems. This creates a layer of steam that starves fires of oxygen, quickly reducing the temperature of the affected area. Since they use much less water than traditional sprinklers, they can to some extent be considered a more sustainable fire suppression method.
Foam deluge systems
One of the biggest challenges in fire suppression is effectively safeguarding areas that contain flammable liquids. Foam deluge systems are the most effective means of controlling the spread of these environments. For this reason, they are commonly installed in refineries, aircraft hangers and industrial warehouses. A fire in these types of environments can accelerate tremendously quickly. Therefore, foam deluge systems are designed for the quick widespread application of suppressive materials.
Foam deluge systems use a mixture of foam and water to quickly control burning flammable liquids, cooling the surface area. The consistency of the foam causes a thick blanket to starve fires of oxygen and inhibit the release of flammable gases, effectively smothering the blaze. In this sense, they are not unlike conventional fire extinguishers.
Manual
Standpipe manual systems are a series of pipes which connect a water supply to hose connections, basically an extension of the fire hydrant system. They are designed to provide a pre-piped water system for building occupants or the fire department. Standpipe systems are designed to provide fire protection water for hose lines in strategically placed locations inside a building or structure. Standpipe system have three classes.
Class I Landing valve.
Class II Fire hose reel.
Class III Landing valve and Fire hose reel.
Fire Extinguishers a portable fire extinguisher can save lives and property by putting out a small fire or containing it until the fire department arrives; but portable extinguishers have limitations.
- Use a portable fire extinguisher when the fire is confined to a small area, such as a wastebasket, and is not growing; everyone has exited the building; the fire department has been called or is being called; and the room is not filled with smoke.
- To operate a fire extinguisher, remember the word PASS:
- Pull the pin. Hold the extinguisher with the nozzle pointing away from you and release the locking mechanism.
- Aim low. Point the extinguisher at the base of the fire.
- Squeeze the lever slowly and evenly.
- Sweep the nozzle from side-to-side.
Different fire extinguisher types
- Dry Powder extinguishers.
- Water mist
- Clean agent
- Foam Fire Extinguisher
- Wet chemical
- Water extinguishers
- CO2
- Foam
- Class E fires