Special risk fire protection suppression systems are designed to protect high-value, high-risk, or sensitive environments where traditional fire suppression systems (like sprinklers) might not be as effective. These systems are used in areas such as data centres, chemical plants, electrical rooms, pharmaceutical, petrochemical plants and critical infrastructure where the risk of fire could lead to significant damage, and where minimising downtime or preventing damage to valuable assets is crucial.
Some examples of special risk fire protection suppression systems include:
Pre-action Sprinkler Systems
Use: Often used in areas like computer rooms or data centres, where accidental water damage from sprinklers is a concern.
How it works: These systems have two stages—first, a detection system must trigger before water is released, and then a second action allows water to be dispersed if the fire is confirmed.
Deluge Sprinkler Systems
A fire sprinkler deluge system is a type of automatic fire protection system designed to quickly suppress large fires in high-hazard environments, such as chemical plants, refineries, or power stations. It operates by releasing a large volume of water over a specific area to rapidly control and suppress the fire.
Here’s how it works:
Piping and Nozzles: The deluge system consists of a network of pipes equipped with open spray nozzles. Unlike traditional sprinkler systems, which have closed heads that activate when exposed to heat, the deluge system’s nozzles are open at all times.
Activation: The system is triggered by a fire detection system, which typically includes heat or smoke detectors, or a manual activation switch. When the fire detection system senses a fire, it activates the deluge valve.
Water Flow: Once the deluge valve is triggered, water (often mixed with foam for specific applications) is immediately released through the open nozzles. The deluge system typically releases water at a high rate to flood the area with a large volume of water, suppressing the fire quickly.
Coverage: Deluge systems are designed to cover large areas and are often used in settings where fire hazards are extreme, and rapid suppression is critical. The widespread distribution of water helps control fires more effectively than traditional sprinkler systems, which are more localized.
This type of system is ideal for environments where high levels of heat or toxic fumes might be present, as the deluge of water provides a broad, rapid response to mitigate the spread of fire.
Aqueous Film-Forming Foam (AFFF) Systems
Use: Used for protecting flammable liquid hazards, such as in aviation fuel storage or chemical plants.
How it works: This system releases foam that forms a film on top of the flammable liquid, preventing the fire from spreading by reducing fuel vapour and creating a barrier between the fuel and oxygen.
Key Considerations:
Risk Assessment: Different environments require different solutions based on factors like the type of hazard, the value of assets, and the presence of human occupants.
Response Time: Most of these systems are designed to act quickly to suppress fires before they spread, which is critical in preventing widespread damage.
Environmental and Safety Concerns: Many of these systems are designed with safety in mind, using clean agents that don’t harm the environment or people when deployed correctly.
These specialized systems offer a tailored approach to fire protection, ensuring that critical areas and valuable assets are safeguarded while minimizing the risk to human life and the environment.