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Gas Suppression FAQ's

HOW DOES GAS SUPPRESS A FIRE?

Chemical Gas:

Chemical/Synthetic gas suppresses fire by removing the free radicals or heat element of the fire triangle. As chemical gases such as FM200 or Novec 1230 work by chemical reaction rather than oxygen reduction, there is a saving in the amount of agent when compared with inert gases. This can reduce the footprint required when available space is tight.

Inert Gas:

A fire needs more than 15% oxygen to sustain combustion. An Inert gas suppression system such as IG55 or IG541 suppresses fire by reducing the amount of oxygen in a protected space to below 15% and removing the oxygen element of the fire triangle. A well-designed inert gas system will reduce the oxygen levels to suppress the fire but keep oxygen levels above 12% to sustain the life of anyone present in the protected space at the time of discharge.

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WHAT IF I’M IN THE ROOM WHEN THE GAS DISCHARGES?

The systems control panel has a key-operated switch to enable the selection of manual or automatic mode. Before entering a room protected by a gaseous suppression system, the mode should be set to manual.

The system will now not progress into the second stage should a fire be detected. Discharge hold-off buttons are also installed within the protected risk to ensure that the discharge countdown can be halted and reset while the cause of activation is investigated.

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WILL THE GAS BE DISCHARGED IF THERE IS A FALSE ALARM?

For total flood systems the detection and activation systems generally consist of a network of detectors configured to achieve coincidence operation, often called double knock. Once the first detector senses fire the system goes into first stage alarm. At this point, any potential causes of fire can be investigated.

The system can then be reset, or it will remain in the first stage until a second detector senses fire. Upon a second detector sensing fire, the system activates a second-stage alarm and begins a countdown to gas discharge.

Early warning can also be achieved by installing a HSSD (High Sensitivity Smoke Detection) Aspiration system. Potential fires can then be investigated early to prevent unnecessary gas discharge.

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