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In general, fixed systems are designed to extinguish a fire by reducing the oxygen level. Our atmosphere oxygen ambient is 21%. A fire requires a consistent oxygen level of 18% and above. However a person can breathe as low as 12%. So systems are designed to lower the oxygen to approximately 15%. This ensures life can be supported at all times whilst the fire is starved.
The only system that will kill both by design is CO2 (Carbon Dioxide). CO2 lowers oxygen to 0%. No oxygen means nothing will live. However CO2 should be and is normally placed in unmanned areas.
There are many types and trade marks available, but they all fall into four categories – Chemical, Inerts Liquids & Water based
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are man made and manufactured specifically for fire fighting use, these are typically HFC227ea, and Novec1230 They are designed for full flood 3 dimensional purposes.
The cylinders due to the low pressure of 25 bar are best situated close to or in the protected enclosure with short lengths of pipe in between the cylinder and nozzles. If the length of pipe is exceeded due to the cylinders being a long distance from the nozzle positions, extra cylinders, larger bore pipework and a possible manifold arrangement has to be employed. This will result in considerable rise in costs.
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use gas extracted from the atmosphere, these are typically Argon, Nitrogen and CO2. All inert systems on the market either use one of the mentioned gas type or a blend of. They are for full flood 3 dimensional purposes and are as they act as a self propellant they do not suffer from pipe length restrictions. The cylinder bank can be up to 2km in the most extreme circumstances.
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are man made and manufactured specifically for fire fighting use, these are typically Ansul R102 Ansulex, and Pyrochem2. They are for risk specific 2 dimensional purposes such as high temperature grease and fat fires found in Kitchen areas. The cylinders are best situated close to or in the protected appliances with short lengths of stainless steel pipe.
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are de-ionised ordinary water propelled by high pressure nitrogen for fire fighting use. These are typically known as Watermist, Fogtec and High Fog. They are for risk specific 2 dimensional purposes such as electrical and chemical fires. However at present there is no third party accreditation or EN standards to work with, so therefore G8 Fire will not promote use of such systems.
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ADR 2004. The Carriage of High Pressure Dangerous Goods and Transportable Pressure Equipment.
F-Gas Regulation. or EC Regulation 842/2006,
BS EN 15004-1: 2008 for general requirements for gaseous systems
BS EN 15004-2: 2008 for FK-5-1-12 systems (Novec)
BS EN 15004-5: 2008 for HFC227ea systems (FM200)
BS EN 15004-9: 2008 for IG55 systems (Proinert /Argonite)
BS EN 15004-10: 2008 for IG-541 systems (Inergen)
BS 5306-4: 2001 for CO2 Systems only
BS 5306: Part 5.1: 1992 for Halon Systems only
BS EN 1803 & 1968: for all high pressure cylinder containers in UK
UL300 standards: for R102 Kitchen systems
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Please move on to G8 Fire  Products
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