Fire extinguishing system for hydrocarbon storage tanks

摘要

A fire extinguishing system for a floating or fixed roof hydrocarbon or petro chemical storage tank includes an above-ground storage tank having a cylindrically shaped upwardly extending annular wall and a floating or fixed roof on top of the storage tank. The tank also includes a sensor for detecting fire or smoke in the above-ground storage tank and a mass of fire extinguishing materials and a dispenser for dispensing the fire extinguishing materials inwardly across the top of the storage tank upon sensing a fire within the tank. Further, a sub-terrian tank having a capacity greater than the capacity of the above-ground storage tank is disposed below the above-ground storage tank and is connected to the above-ground storage tank so that the hydrocarbon or petro chemical liquid from the bottom of the above-ground storage tank can be almost immediately emptied into the sub-terrain storage tank.