Double-hulled fire resistant above-ground fluid storage tank

Abstract

A double hulled above ground liquid storage tank having an interstitial space completely surrounding the inner hull, the interstitial space being substantially filled with a corrosion inhibiting, flame resisting, freeze resistant, heat absorbing, aqueous mixture. The outer shell of the tank being coated with an intumescent coating.

1 . An above-ground storage tank comprising:
 an outer tank having an cavity;   a hollow inner tank contained entirely within said outer tank cavity;   an interstitial space substantially surrounding said inner tank and separating said inner tank from said outer tank;   said interstitial space substantially filled with a liquid.   
     
     
         2 . The above-ground storage tank of  claim 1 , wherein said liquid is a mixture of water and propylene glycol. 
     
     
         3 . The above-ground storage tank of  claim 2 , wherein said mixture is between 10% and 60% by weight propylene glycol. 
     
     
         4 . The above-ground storage tank of  claim 1 , wherein said liquid is flame resistant. 
     
     
         5 . The above-ground storage tank of  claim 1 , wherein said liquid inhibits corrosion. 
     
     
         6 . The above-ground storage tank of  claim 1 , wherein said liquid is freeze resistant. 
     
     
         7 . The above-ground storage tank of  claim 1 , wherein said liquid provides heat protection to said inner tank by absorbing heat from said inner tank. 
     
     
         8 . The above-ground storage tank of  claim 1 , wherein said outer tank is made from mild carbon steel, 
     
     
         9 . The above-ground storage tank of  claim 1 , wherein said outer tank is at least 0.25 inches thick. 
     
     
         10 . The above-ground storage tank of  claim 1 , wherein said inner tank is made from mild carbon steel. 
     
     
         11 . The above-ground storage tank of  claim 1 , wherein said inner tank is at least 0.25 inches thick. 
     
     
         12 . The above-ground storage tank of  claim 1 , wherein said outer tank is coated with a layer of intumescent material. 
     
     
         13 . The above-ground storage tank of  claim 12 , wherein said layer of intumescent material is of necessary thickness to achieve the fire rating. 
     
     
         14 . The above-ground storage tank of  claim 1 , further comprising one or more fuel supply connections. 
     
     
         15 . The above-ground storage tank of  claim 1 , further comprising one or more fuel returns connections, 
     
     
         16 . The above-ground storage tank of  claim 1 , further comprising one or more fuel detection alarms. 
     
     
         17 . The above-ground storage tank of  claim 1 , further comprising one or more fuel detection switches. 
     
     
         18 . The above-ground storage tank of  claim 1 , further comprising one or more leak detection switches. 
     
     
         19 . The above-ground storage tank of  claim 1 , further comprising one or more leak detection alarms. 
     
     
         20 . The above-ground storage tank of  claim 1 , further comprising one or more vents, 
     
     
         21 . The above-ground storage tank of  claim 1 , further comprising one or more mechanical feel level gauges. 
     
     
         22 . The above-ground storage tank of  claim 1 , further comprising one or more stub-up areas. 
     
     
         23 . The above-ground storage tank of  claim 1 , wherein said tank is capable of supporting equipment on the top surface of the tank.