Method for extinguishing tank fires

Fire extinguishers – Processes – With mixing of extinguishing compounds

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169 66, 169 68, 169 46, 169 15, A62C 306

Patent

active

054640652

ABSTRACT:
Fires in tanks storing combustible liquids are extinguished using water from a settled layer at the tank bottom to form a foam that is transported to the top of the combustible liquid by the lifting action of an inert gas stream introduced into the tank at a location below the liquid surface. A stream of water is removed from the tank, mixed with a foam-forming concentrate, merged with a flowing stream of inert gas, and circulated back to the tank at a point below the surface of the stored liquid to form an upwelling foam column which explodes upon the liquid surface and spreads across that surface to extinguish the fire and prevent its reignition.

REFERENCES:
patent: 307689 (1884-11-01), Thayer
patent: 1115887 (1914-11-01), Bartels
patent: 1164234 (1915-12-01), Steiner et al.
patent: 2718927 (1955-09-01), Dill et al.
patent: 2730178 (1956-01-01), Risinger
patent: 3475333 (1969-10-01), Meldrum et al.
patent: 4664199 (1987-05-01), Grant et al.
patent: 5113945 (1992-05-01), Cable

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