Inert gas extinguishing system

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An inert gas extinguishing system is a fixed fire extinguishing system in which the inert gases argon or nitrogen or mixtures thereof ( Inergen or Argonite ) are used as extinguishing agents .

Argon bottles in the inert gas extinguishing system of a data center

Types of inert gas extinguishing systems

Differentiation criteria for inert gas extinguishing systems

  • Type of storage of the extinguishing agent
    • High pressure extinguishing systems (liquid or gaseous storage in gas bottles under high pressure, currently up to 300 bar)
    • Low-pressure extinguishing systems (storage of the liquid and cryogenic extinguishing gas in insulated low-pressure containers)

Extinguishing effect

The extinguishing effect of inert gases is achieved by displacing the oxygen in the air . This is referred to as the sticking effect, which occurs when the specific limit value required for combustion is not reached. Most of the time the fire goes out when the oxygen content is reduced to 13.8% by volume. For this purpose, the existing air volume only needs to be displaced by about a third, which corresponds to an extinguishing gas concentration of 34% by volume.

For combustibles that require significantly less oxygen for combustion, a correspondingly higher extinguishing gas concentration is required, e.g. B. with acetylene, carbon monoxide and hydrogen.

Argon is heavier than the ambient air and penetrates the extinguishing area particularly quickly and thoroughly. As a noble gas, it is particularly inert and therefore also suitable for extinguishing metal fires.

78.1% by volume of nitrogen is a component of the natural atmosphere and therefore has a specific weight similar to that of the ambient air and is therefore particularly well distributed in the extinguishing area.

Areas of application

The completely residue-free extinguishing inert gas extinguishing systems are particularly suitable for use in areas in which water, foam or powder cannot be used as an extinguishing agent due to expected consequential damage (switch and control systems, IT and telecommunications systems and equipment and other high-quality technology, irretrievable cultural assets, and much more).

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