Fixed foam generators apply foam onto the fuel surface to create a foam blanket and suppress the vapours. To minimise the possibility of damage to the equipment from an explosion or fire.
Subsurface injection products inject foam into the bottom of a fuel tank and allow it to float to the surface to spread and extinguish the fire. This method became feasible with the development of foams resistant to fuel contamination.
Where the fuel does not allow subsurface injection, due to contamination risk, Semi-subsurface injection products are used. Foam is separated from the fuel by a flexible hose. Foam is pumped through the hose so that it rises to the fuel surface and extinguishes the fire.
Available to address risks in the majority of flammable liquid storage tanks and areas.