Expandable-Volume Liner for a Collapsible Liquid Holding Tank

Abstract

An expandable-volume liner is usable with a collapsible liquid holding tank frame consisting of top and bottom rails spaced apart by vertical struts. The expandable-volume liner has pliant impervious side walls, a pliant impervious floor panel and at least one pliant impervious collapsible bag extending outwardly from the liner. Each bag is optionally extendable between its respective surrounding top and bottom rails and adjacent struts to conform the tank to the differing footprints presented by various sites and the volume of liquid necessary to accomplish the task at hand. The liners are especially suited to firefighting applications and can be used in conjunction with existing frames built for non-expandable volume liners.

What is claimed is: 
     
         1 . For lining an interior of a collapsible, portable, liquid holding tank frame having top and bottom rails spaced apart by vertical struts, a liner comprising:
 pliant impervious side walls and a pliant impervious floor panel, said pliant impervious side walls having at least one opening therethrough sized to be surrounded by the top and bottom rails and two adjacent struts of the frame; and   at least one pliant impervious collapsible bag, one for each said opening, having a mouth welded to its corresponding said opening, said bag being extendable from said mouth between its respective surrounding said top and bottom rails and adjacent struts and outwardly from said side walls.   
     
     
         2 . A liner according to  claim 1 , each said mouth having at least one strap connectable at one end to one of said top and bottom rails and at another end to another of said top and bottom rails between its corresponding adjacent struts whereby said bag, when folded from a closed end thereof to its mouth into a stored condition, can be secured in said stored condition by said at least one strap.