Westpoort VCA Eindtermen Basis, VOL, VIL VCU Engels

B. fires of liquid or liquefying substances, so-called greasy fires, e.g. petrol, oil, alcohols, paints, rubber, paraffin, solvents C. burning gases such as methane, propane, butane, acetylene D. fires of metals, such as magnesium, aluminium, potassium, sodium, alloys of metals, unclassified fires, such as fires on and in electrical equipment

Dangers and disadvantages of different extinguishing agents Water - Causes water damage - Electrically conductive - There are quite a few chemicals that react violently with water - Dangerous if used on burning liquids: burning liquids explode, resulting in a flash fire; many liquids float on water so that the fire spreads - Sensitive to freezing - Environmental damage due to contaminated fire extinguishing water

Extinguishing media and fire classes

Extinguishing methods (class A fire) - Extinguish with water -

Extinguishing with extinguishing powder (in practice ABC powder)

Foam -

Deals limited damage Sensitive to frostbite

- -

Extinguish with foam

- -

Fire blanket, to be used for burning products and people and fire on flat ground

Foam can be electrically conductive

Sand -

The sand quickly cakes together and hardens

Extinguishing methods (class B fire) -

Extinguishing with extinguishing powder (in practice ABC or BC powder)

Extinguishing powder - Limited cooling -

- -

Extinguish with foam Extinguish with sand

Reduces visibility in small spaces

- -

Causes damage

Extinguishing methods (class C fire) - Turn off the gas supply -

Polluted

Extinguishing with extinguishing powder (in practice ABC or BC powder)

Carbon dioxide -

Risk of frostbite due to the low temperature

Extinguishing methods (class D fire) -

-

Can have an asphyxiating effect due to oxygen displacement

Extinguish with specific extinguishing powder

Fire blankets - One must get close to the seat of the fire - If not used correctly: danger to the extinguisher - If not properly or not completely covered, there is a greater risk of injury and damage

Extinguishing methods (unclassified fire) - Extinguish with carbon dioxide - Extinguish with adapted foam Most important extinguishing principles - Turn off/remove fuel - Reduce ignition energy and remove heat through cooling - Oxygen displacement and oxygen cutoff - Remove source of ignition

The concept of catalysis -

Certain products can influence the fire (reaction of fuel and oxygen): positive

VCA (SCC) Final objectives | Page 62 of 66