Gas Suppression Cont.

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Inert Gas (IG55, IG541)

Inert Gas fire suppression systems, sometimes referred to as “Clean Agent” systems, use naturally occurring gases (pre-dominantly Nitrogen & Argon) to reduce Oxygen levels within a protected space to such an extent that the atmosphere within the space no longer supports combustion.

A popular choice for Inert Gas fire suppression systems is IG55 which is 50% Argon / 50% Nitrogen mix. IG55 is a clean, odourless and electrically non-conductive gas that makes it ideal for use within areas containing sensitive electrical/electronic equipment.

Inert gas system can be considered as a environmentally responsible choice for fire suppression systems as IG55 has zero Ozone depletion potential, zero global warming potential, and leaves no residue that would necessitate an extensive post-discharge clean-up operation.

Applications

  • Computer rooms
  • Telecommunications rooms
  • Switchgear rooms & electrical cabinets
 

Halocarbon Gases

Halocarbon gaseous suppression systems, such as HFC-227ea, were designed as replacements for the popular Halon firefighting product. HFC-227ea is a Heptafluoropropane with no ozone depletion potential.
HFC-227ea is classified as an HFC or “F-Gas” and the installation, use, and maintenance of the systems falls under the EU regulated “F-Gas” certification scheme.

Applications

  • Computer rooms
  • Telecommunications rooms
  • Switchgear rooms & electrical cabinets
 

Carbon Dioxide (CO2)

Carbon Dioxide, having a density greater than air, is a gaseous suppression system that can be used in a “local application” (that is applied directly to piece of machinery rather than simply used to flood a room with gas) or a total flood application. Carbon Dioxide cannot be used when personnel are present and systems for the control of CO2 often incorporate a number of safe-guarding “lock-offs” to prevent accidental discharge when protected spaces are occupied.

Applications 

  • Unoccupied electrical switchgear rooms
  • Gas Turbines
  • Machinery spaces
 

Hypoxic System

A Hypoxic system works as a fire “prevention” system by reducing the oxygen within an enclosed space to a level that prevents the combustion of flammable materials, yet maintains a sufficiently high level to allow personnel to work within the room without undue health risks.

The system works by injecting an inert gas, frequently Nitrogen, into the area where the resulting Oxygen level is monitored, with the intention of maintaining an Oxygen level around 15%. The resulting atmosphere has a lower than usual Oxygen level but could be considered as similar to the environment experienced by athletes simulating training at altitude. 

Applications

  • Libraries
  • Archive stores

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