Patent ID: 7188747

Claim:
A fluid storage tank, comprising: a tank frame, comprising a plurality of vertical support members, each vertical support member comprising a substantially rigid substantially vertical frame member and upper and lower brackets secured thereto near respective upper and lower ends thereof, a plurality of substantially rigid lower cross members, each end of each lower cross member being connected to the lower bracket of an adjacent one of the vertical support members so that the plurality of lower cross members thus connected form a lower closed polygon with one of the vertical support members positioned at each vertex thereof, a plurality of substantially rigid upper cross members, each end of each upper cross member being connected to the upper bracket of an adjacent one of the vertical support members so that the plurality of upper cross members thus connected form an upper closed polygon with one of the vertical support members positioned at each vertex thereof, the upper polygon substantially corresponding in size and shape to the lower polygon; and a tank liner, comprising a polygonal bottom panel, substantially corresponding in size and shape to the upper and lower polygons, a plurality of substantially vertical side panels, each side panel secured at a lower edge thereof to an edge of the polygonal bottom panel and at side edges thereof to side edges of adjacent side panels, each side panel having a liner sleeve running along an upper edge thereof open at both ends and substantially corresponding to a side of the upper polygon, the liner sleeves being spaced apart by liner gaps therebetween, each liner gap corresponding to a vertex of the upper polygon, wherein: each upper cross member is positioned within a corresponding one of the liner sleeves, and each of the upper brackets is positioned at a corresponding one of the liner gaps, each of the upper and lower cross members is connected to the respective upper and lower brackets so as to allow relative angular motion between the vertical frame members and the connected upper and lower cross members.