extinguishing Action

The FirePro® produce an extinguishing aerosol fire extinguishers of which the particles have an extinguishing power which is determined by a chemical chain reaction without affecting the oxygen content present in the environment.

The extinguishing action is brought about by two actions (physical & chemical):

physical action

The physical extinguishing action stems from the chemical-physical characteristics. These elements have in comparison with all the other elements required the least amount of energy for ionization (lowest ionization potential). Therefore, and because there is required only a very small amount of energy, it is possible to separate the electrons from the atoms. The required amount of energy is supplied by the abundance of energy that is present in the fire.

The ionization of potassium appears during the extinguishing of a light violet discolouration of the flame. The energy present in the flame is therefore reduced in accordance with the ionization potential of the elements present.

chemical action

During combustion take place in the flame in a rapid sequence certain reactions take place between atoms and fragments of unstable molecules (radicals). Such reactions are called chain reactions of radicals. Because of their unstable nature tend radicals led in order to achieve a stable final state via further reactions.

The stable end products include carbon dioxide (C2O) and water (H2O). The potassium, which is released by the disintegration of the potassium compounds, reacts during combustion with the free radicals of unstable hydroxides, with potassium hydroxide (KOH) is formed, which is a very stable compound. At this stage, the chain reaction of free radicals brought to a halt, and the flame is extinguished.

Briefly in the table below a brief description of the extinguishing operation FirePro® aerosol fire extinguishers and fire extinguishing systems.

To get a fire are required at least three factors, they are: - Oxygen - a combustible dust - An ignition temperature

Fire is nothing else than a chemical reaction in which the substances O, H and OH keep the chain reaction in position.

By means of electrical activation or by reaching 105 ° C to give the LHDC cable (Linear Heat Detection Cable) addressed is the extinguishing unit will be activated.

The aerosol which is released potassium compounds which contain both (A) give a physical as (B) enter into a chemical reaction with the fire.

Re A. Physical action

For the position-finding of the chemical reactions is needed a certain amount of energy required. The required amount of energy is supplied by the energy present in abundance in the flame.

Re B. Chemical action

There are certain reactions between atoms and parts of unstable molecules (radicals), which take place in rapid succession in the flame during the combustion.

Unstable radicals seek to be stable and undergo multiple reactions. A hydroxide (OH) is an unstable radical which is also responsible for the chain reaction of fire. The potassium, obtained by the decomposition of the potassium compounds, during the combustion reacts with the free radicals of unstable hydroxides and form potassium hydroxide (KOH), which is a very stable compound. In this phase stops go off the chain reaction of free radicals and the flame.

This is simultaneously demonstrated that the extinguishing operation has absolutely no influence on its immediate environment, and does not cause collateral damage.

“In a typical fire, there is intensive inter-reaction between atoms and fragments of unstable free radicals in the presence of oxygen. This continues until the burning fuel is depleted. FirePro extinguishes fire predominantly by inhibiting on a molecular level the chemical chain reactions present in combustion.

On activation of the FirePro unit, the FPC compound within is transformed into a rapidly expanding fire extinguishing condensed aerosol consisting mainly of Potassium salt-based K2CO3, H2O (vapor), N2 and CO2.

The gas-type, 3-D, properties of the condensed aerosol facilitate its even and fast distribution in the protected volume as well as its flow into the natural convection currents of combustion.

The solid particles of Potassium salts, which are of a few microns in size, are suspended in an inert gas that displays an extremely high surface to reaction mass ratio - a fact that increases efficiency - which results in less quantities of fire extinguishing agent required.

When the condensed aerosol reaches and reacts with the flame, Potassium radicals (K*) are formed mainly from the disassociation of K2CO3. The K*s bind to other flame free radicals (hydroxyls - OH-) forming stable products such as KOH. This action extinguishes fire without depleting the ambient oxygen content. KOH reacts further in the presence of CO2 and forms K2CO3.

The solid particles of Potassium Carbonate (K2CO3) have a diameter of less than five microns and remain in suspension in the protected room/enclosure for at least 30 minutes, preventing further re-ignition of the fire.”

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