Foam action

Action de la mousse BIOEX

Combustion is a chemical reaction in which a  combustible substance or fuel is oxidised by an oxidiser in the presence of an energy source.

Combustible :

  • Class A (wood, cardboard, paper, textile…),
  • Class B (petrol, oil, white-spirit…),
  • Class C (gases such as propane, butane, acetylene, hydrogen, methane…),
  • Class D (finely divided metals such as powdered aluminium, steel wool, magnesium…).

Oxidising agent: Oxygen from the air, chlorine, oxygenated water, nitric acid, chlorates, perchlorates...

Energy : Mechanical from friction, electric (lightning or static electricity), chemical, biochemical, solar...

Schémas triangle du feu EN

A fire is the result of the interaction of these three elements (the triangle of fire). The removal of one of them extinguishes the fire.

 

Fire-fighting foam acts in two phases:

  • Insulation: it prevents the action of the air and the evaporation of the combustible, thus removing the oxidising agent
  • Cooling: the water in the bubbles decants and evaporates, thus removing or reducing the energy that combustion requires

Foam action

Low, Medium and High Expansion

Low, Medium and High Expansion

Expansion is the ratio between the Foam Volume obtained and the Volume of Foaming Solution used to produce it. For example: 100 litres of water + foam concentrate pre-mix give 1000 litres of foam. ...

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Direct and indirect applications of an AFFF or AR foam concentrate on class B fires

Direct and indirect applications of an AFFF or  AR foam concentrate on class B fires

Extinguishing a fire requires a suitable foam concentrate, and a controlled application. There are 2 application modes, recognised by the European (EN1568) and international (IS...

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