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<<Code for design of gas extinguishing systems GB50370-2005>>

• 3.5 hot gas sol prefabricated fire extinguishing system
• 3.5.1 the fire-extinguishing design density of the hot-air sol prefabricated fire-extinguishing system shall not be less than 1.3 times of the fire-extinguishing density.
• 3.5.2 the fire-extinguishing density of type S and type K thermal sol for solid surface fires is 100g/m.3.5.3 for electrical equipment fire in places such as communication room and computer room, the fire-extinguishing design density of type S hot gas sol shall not be less than 130g/m.
• 3.5.4 in case of fire in cable tunnel (sandwich, well) and self-provided generator room, the fire-extinguishing design density of type S and type K hot gas sol shall not be less than 140g/m.2.6.2 in telecommunication room, computer room, such as protection zone, agent application time should not be greater than 90 s, nozzle temperature should not be greater than 150 ℃;In other protection zone, the discharge time should not be more than 120 s, nozzle temperature should not be greater than 180 ℃.
• 3.5.6 the fire-extinguishing density of type S and type K thermal sol against other combustibles shall be determined by test.
• 3.5.7 the fire-extinguishing density of other types of hot gas sol shall be determined by test.
• 3.5.8 the immersion time of fire fighting shall comply with the following provisions:1 wood, paper, fabric and other solid surface fire, should use 20min;Fire in communication room, computer room and other protective areas and other solid surface fires shall be carried out for 10min.

Multiple action mechanism of aerosol fire extinguishing process

• Physical control

The metal salt particles in fire extinguishing agent occur hot melting ,gasification, and other physical endothermic processes at high temperature and absorb a lot of heat, and quickly reduce the flame temperature.

• Gaseous chemical inhibition

Under the action of heat, the metal ions that produced by the decomposition of the extinguishing agent or the cations which lost its electrons can react with the active groups in the combustion process and consume a large number of active groups repeatedly, thus reducing the combustion free radicals.

• Solid chemical inhibition

The particles in the fire extinguishing agent are small and numerous. They have large surface area and surface energy which can adsorb the active groups in combustion and produce chemical action. They consume a large number of active groups and reduce the burning free radicals.

• Lowering concentration of oxygen

A large number of inert gases such as N and CO produced by extinguishing agent can reduce the oxygen concerntration in combustion and prevent furrther combustion.

Technical parameters