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Class B - Liquid fires / Hydrocarbons

Hydrocarbon fires are combustible liquid fires.

Hydrocarbons are composed of carbon and hydrogen.

They are combustibles that have no affinity for water.


There are 3 main families:

  • Light hydrocarbons: petrol, heptane, cyclohexane, terpenes...
  • Heavy hydrocarbons: fuel, diesel, kerosene...
  • Aromatic hydrocarbons: benzene, toluene...


There are 2 types of extinguishing action:

  • A chemical action thanks to the AFFF film.
    This action only requires spraying and not necessarily expansion. The foam can be sprayed directly using a long range appliance. This so-called "solid" jet is certified under standard EN 1568-3 in class I.
     
  • A so-called mechanical action for non AFFF foam concentrates.
    The accumulation of bubbles creates a mattress of insulating foam. This action requires so-called gentle application, or indirect application. This method of application is recognised by the EN 1568-3 standard as class III.

The extinguishing speed is comparable, only the application method changes.


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