|CLASSES of FIRE|
|CLASS A – Ordinary combustible fires are the most common type of fire. Wood, paper, textile, and plastics||CLASS B – Flammable liquid or gaseous fuels such as gasoline, oil, butane, propane, & gas.||CLASS E – Electrical fires are fires involving potentially energised electrical equipment.|
|THE COMPONENTS OF A SPECIAL HAZARDS FIRE SYSTEM|
|SUPRESSION SYSTEM this is the system that will extinguish the fire: can be Water(Sprinklers), Gas, AFFF Foam, Dry Chemical Powder or FirePro. The selection of the most appropriate agent will be done with the client, and is based on the risk design, location, and compliance issues.
DETECTION can be smoke. heat, linear heat, infrared, Vesda, or any combination depending on risk design and location
CONTROL SYSTEM how does it operate, is is automatic or manual operation, are shutdowns required, is a delay required – this will determine which Control panel is used. Selection is based on the system design and the compliance required for the risk. Can be AS4487 for land based risks, AS5062 for mobile plant, each have different requirements.
If you need assistance in determining system design or complaince issues, ASK.
|HOW IT WORKS|
|The fire tetrahedron is an addition to the fire triangle. It adds the requirement for the presence of the chemical reaction which is the process of fire.
Combustion is the chemical reaction that feeds a fire more heat and allows it to continue.
|FIRE – formation of free radicals (O*,H*,OH*) during the chemical chain reaction of fire|
|AEROSOL PHASE I – before extinguishing process Inert gases (N2, H2O, CO2) carrying solid micro particles K2CO3|
|AEROSOL PHASE II – during extinguishing process – formation of K* radicals by the disassociation of K2CO3|
|FIRE IS EXTINGUISHED – reaction between radicals lead to formation of stable compounds (KOH, 2CO3)|