Double wall storage tank

Abstract

A method of making a double wall tank for storing liquids comprises providing an inner tank having substantially cylindrical sidewalls and end walls; wrapping an impervious sheet material around the cylindrical sidewalls; providing a spacer means on exterior surfaces of the end walls; covering the wrapped inner tank and spacer means with reinforced resinous material to form an outer tank; and providing access to inspect an interstitial space between the impervious sheet material and the inner tank.

I claim:  
     
         1 . A method of making a double wall tank for storing liquids, the method comprising: 
 providing an inner tank having substantially cylindrical sidewalls and transverse end walls;    wrapping an impervious sheet material around the cylindrical sidewalls;    providing a spacer means on exterior surfaces of the end walls;    covering the wrapped inner tank and spacer means with reinforced resinous material to form an outer tank; and    providing access to inspect an interstitial space between the impervious sheet material and the inner tank.    
     
     
         2 . The method of  claim 1  wherein the reinforced resinous material comprises fiberglass.  
     
     
         3 . The method of  claim 1  wherein the impervious sheet material comprises a plastic film.  
     
     
         4 . The method of  claim 1  wherein the impervious sheet material comprises MYLAR™ film.  
     
     
         5 . The method of  claim 1  wherein the impervious sheet material comprises polyethylene sheeting.  
     
     
         6 . A double wall tank for storing liquids comprising 
 an inner tank having substantially cylindrical sidewalls and transverse end walls;    an impervious sheet material wrapped around the cylindrical sidewalls;    a spacer means covering exterior surfaces of the end walls;    a reinforced resinous material applied to the impervious sheet material and spacer means to form an outer tank; and    an access port operatively connected to an interstitial space between the impervious sheet material and the inner tank to enable leak detection.    
     
     
         7 . The tank of  claim 6  wherein the reinforced resinous material comprises fiberglass.  
     
     
         8 . The tank of  claim 6  wherein the impervious sheet material comprises a plastic film.  
     
     
         9 . The tank of one of  claim 6  wherein the impervious sheet material comprises MYLAR™ film.  
     
     
         10 . The tank of  claim 6  wherein the impervious sheet material comprises polyethylene sheeting.