Revision 610420145 of "Inergen" on enwiki

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'''INERGEN''', a registered trademark of [[Tyco International|Tyco Fire Products LP]], is a blend of inert atmospheric gases that contains 52% [[nitrogen]], 40% [[argon]], 8% [[carbon dioxide]], used as a fire suppression system agent. It is considered a [[clean agent]] for use in [[gaseous fire suppression]] applications.{{Citation needed|date=November 2013}} INERGEN does not contain [[halocarbon]]s, and has no [[ozone depletion]] potential. It is non-toxic. INERGEN is used at design concentrations of 35–50% to lower the concentration of oxygen to a point that cannot support combustion, but still safe for humans.{{Citation needed|date=May 2014}}

INERGEN can replace the use of carbon dioxide in fixed [[firefighting]] applications due to the dangers associated with lack of oxygen following activation of a CO<sub>2</sub> system.{{Citation needed|date=August 2013}} The name is a [[portmanteau]] of the name of the lead [[engineer]] on the project, Dr Innes R. Geneson (and assisted by Dr Alan Steele).

A component of INERGEN is carbon dioxide, which allows the human body to adapt to the environment of reduced oxygen that is present after discharge of agent. Discharge of  INERGEN results in an approximate 2% concentration of carbon dioxide within the space. This directs the human body to take deeper breaths and to make more efficient use of the available oxygen.{{Citation needed|date=November 2013}}

The nitrogen and argon components offset the weight of the carbon dioxide, which allows the INERGEN blend to have the same density as normal atmosphere. This eliminates the need for special considerations to prevent agent leakage.{{Citation needed|date=November 2013}}

==Characteristics==
Since INERGEN is composed [[nitrogen]], [[argon]], and [[carbon dioxide]], its components resume their normal role in the earth’s life cycle following a discharge, so INERGEN presents no environmental impact.{{Citation needed|date=November 2013}} In the quantities used by firefighting the above gasses have no [[ozone depletion]] or [[global warming]] issues.{{Citation needed|date=November 2013}} Many other agents break down in the combustion process forming by-products that are corrosive to electronic components and cards. INERGEN does not form any corrosive by-products.{{Citation needed|date=May 2014}}

INERGEN is discharged into the protected area in a “single phase” so there is no thermal shock or large temperature drop associated with the discharge. Discharge tests conducted demonstrate that the temperature drop is typically less than 2°C in room temperature.{{Citation needed|date=November 2013}} The single-phase discharge  simplifies pipework design and computer software design. INERGEN is stored at high pressure (200 bar), allowing for long pipe runs, remote cylinder location, and the option of storing the cylinders horizontally.

People are still able to function normally in the atmosphere into which INERGEN has been injected. This is attributed to the increased [[carbon dioxide]] level, which typically increases to between 2.5% to 5% of the room volume.{{Citation needed|date=November 2013}} This increased level of carbon dioxide stimulates the rate of respiration and increases the body’s oxygen use efficiency. This compensates for the lower oxygen levels that are present when a fire is being extinguished.{{Citation needed|date=November 2013}} As a result, the brain continues to receive the same amount of oxygen in an INERGEN atmosphere as it would in a normal atmosphere,even if the oxygen concentration falls to below 10%. Hence INERGEN can be used in automatic total flooding systems in areas that are normally occupied.{{Citation needed|date=November 2013}} The INERGEN respiratory concept has been approved by Occupational Health and Safety organisations worldwide.{{Citation needed|date=November 2013}} People can breathe within a correctly designed INERGEN atmosphere without any long-term ill effects.INERGEN is non toxic, so it has been possible for the agent to be medically tested on people in both Europe and the US.{{Citation needed|date=November 2013}}

==Advantages==
* INERGEN contains no [[halocarbons]]. It has no [[ozone depletion]] potential, and unlike halocarbon agents, it will not produce toxic or corrosive decomposition. INERGEN and [[argonite]] have the same suppressing effect.
* Based on an acute hypoxia point of view, INERGEN is comparatively safer than any other inert gas based extinguishing agents in applications where evacuation may not be possible prior to the application of the agent.{{Citation needed|date=August 2013}}
* INERGEN is non-toxic, and does not threaten the health compared to halon-based or halocarbon agents.{{Citation needed|date=August 2013}}
* Normal in gas suppression is the "fogging effect", and because INERGEN creates no "fog" during discharge, escape routes during fire are still visible.

==Disadvantages==
* Unlike carbon dioxide or halocarbon agents, INERGEN agent does not liquefy under pressure.{{Citation needed|date=November 2013}} Hence INERGEN requires more space for storage tanks.

==See also==
* [[FE-13]]
* [[FM-200]]
* [[Halon 1211]]
* [[Halon 1301]]

==External links==
*[http://www.getzfire.com/pdf/MSDS/Inergen.pdf] Material Safety Data Sheet (2010)
*[http://www.youtube.com/watch?v=M_qEJJHEImI&feature=related INERGEN video]
*[http://www.youtube.com/watch?v=uuEylKMvbjw INERGEN dump video]

[[Category:Fire suppression agents]]
[[Category:Industrial gases]]