Argon and nitrogen are not toxic in the concentrations required to extinguish fires – however, when released, the oxygen concentration is always significantly lower compared to the ambient atmosphere. For this reason, Oxeo extinguishing systems provide warnings to anyone present in the extinguishing zone through acoustic and optical alarms to evacuate the zone before the extinguishing process starts. These systems can also be used in areas that are accessed by people.

Argon (IG-01)

Argon is a noble gas obtained from the ambient air and present at 0.93% in the natural atmosphere by volume.

Its density compared to air is 1.38 : 1. As argon is considerably heavier than air it is particularly suitable for spaces, such as false floors, that are less well insulated in their upper part. Due to its high degree of inertia (“true” inert gas), argon is also especially suitable for metal fires.

Nitrogen (IG-100)

The natural atmosphere contains 78.1% Nitrogen by volume, with a density of 0.967 : 1 compared to air.

Nitrogen thus has a similar density to air, which permits nitrogen to disperse optimally throughout the extinguishing zone and to maintain an extinguishable inert gas concentration over a particularly long period. This qualifies nitrogen as a universal extinguishing agent for a broad range of applications.

Mixed gases (IG-55 / IG-541)

Mixed gases – containing both argon and nitrogen, and optionally small amounts of carbon dioxide – may also be used in Oxeo extinguishing systems. Typical mixed gases for the use in inert gas extinguishing systems are IG-55, consisting of 50% argon and 50% nitrogen, as well as IG-541, consisting of 52% nitrogen, 40% argon and 8% carbon dioxide.

In conventional inert gas extinguishing systems, the gas escapes from the cylinders into the pipe network at the beginning of the extinguishing process with a charging pressure of up to 300 bar. This creates a pressure spike at the beginning of an extinguishing process as well as a heavy stream of extinguishing agent which rapidly decreases with the duration of the flooding.

Oxeo ConstantFlow Technology operates with high-performance pressure regulators mounted directly on the gas cylinder valves. At the start of the extinguishing procedure the operating pressure is thus already reduced to a maximum of 60 bar at the output of the gas cylinders. In addition a constant stream of extinguishing agent is created without a pressure spike.

When using Oxeo ConstantFlow Technology the connected conduits and system components need only to be designed for the low pressure level of 60 bar maximum.