Gaseous fire suppression systems are effective on class A, B, C fires and for electrical equipment. But they are not used to extinguish the following - Fibrous, granular, foamed and other inflammable material (such as sawdust, cotton, grass meal etc.).
- Spontaneous combustion chemical agents, polymeric materials.
- Metal hydride and pyrophoric matter.
- Class D fire (natrium, kalium, magnesium, titanium etc).
To extinguish a fire mainly is used a dilution or an oxygen deprivation of a protected space or an interruption of chemical chain eaction.
The inert gases are obtained by fractional distillation of air. Purified nitrogen and argon gases are most commonly used as inert gases due to their high natural abundance. Inergen is a blend of inert atmospheric gases that contains 52% nitrogen, 40% argon, 8% carbon
dioxide, used for fire suppression system agent. The inert gases are kept in a compressed condition.
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.
CO2 Carbon dioxide extinguishes flames using the more traditional methods of oxygen deprivation, dilution, cooling.
Carbon dioxide has also been widely used as an extinguishing agent in fixed fire protection systems for local application of specific hazards and total flooding of a protected space.
There are gaseous fire suppression agents known as Halons. The most popular are HFC-227, HFC-125, Novec 1230. Halons are a group of compounds obtained by replacing the hydrogen atoms of a hydrocarbon with halogen atoms.
Halons are electrically nonconductive and leave no residue. They are used in extinguishers, in which a stream of liquid halon is directed at a smaller fire by a user. The stream evaporates under reduced pressure, producing strong local cooling, as well as a high
concentration of halon in the immediate vicinity of the fire. In this mode, extinguishment is achieved by cooling and oxygen deprivation at the core of the fire.
However, there are some disadvantages of using halons as a gaseous fire suppression agent. First of all, Halon fire suppression is not completely non-toxic for a human. Very high temperature flame, or contact with red-hot metal, can cause decomposition to toxic
byproducts. They are totally unsuitable for Class D (metal) fires, metal hydride as they will not only produce toxic gas and fail to halt the fire, but in some cases pose a risk of explosion. Novec 1230 can lose its effectiveness in a contact with water or solvent (polar
solvent or hydrocarbon solvent), undergoes a reaction of water that makes HFC-227ea and PFP acid, and then produces by inhalation on a surface of lungs HFC-227ea and PFP acid.
There is no chance of success in discussion the preference of one extinguishing agent to another taking account of the fact that there is no safety and non-toxic gaseous fire suppression agent as any fire suppression is based on weakening of oxygen concentration.
The information on our website is for your consideration, comparison and choice.

News

Friday, 27 December 2013

Contract with OJSC "TAIF-NK"

December, 2013

The contract for infrastructure of engineering safety features was concluded between "Telecom & Technology Transfer Ltd" and OJSC "TAIF-NK".

Friday, 27 December 2013

Equipment supply on Antipinsky Refinery is completed

December, 2013

"Telecom & Technology Transfer Ltd" fulfilled the obligation. Our company delivered to CJSC Antipinsky Oil Refinery (Tyumen) all the fire protection equipment – Bladder Tanks MTB-V, firewater monitor FJM-EL, Inbal valves, gas fire-fighting equipment LPG.

Friday, 27 December 2013

Electronic bracelets production in Kazakhstan

December, 2013

On demand of Kazakh General Prosecutor Office "Telecom & Technology Transfer Ltd" in cooperation with Kazakh partners plan to produce electronic bracelets to track offenders.

The details are on our website, section "Projects".