Patent ID: 8381780

Claim:
A lift assembly for installing, lifting, or supporting a collapsible bag within a vessel configured to contain a volume of fluid, comprising: an assembly support structure adapted to be attached at least to opposite sides of a top portion of the vessel wherein the vessel comprises an entry port positioned at a bottom portion of the vessel, the entry port adapted to allow entry of the collapsible bag into the vessel; a lifting component mounted on the assembly support structure and vertically movable relative to the assembly support structure, and wherein the lifting component is extendable to at least the level of the entry port, the lifting component configured and arranged to be attached to the collapsible bag to be installed in the vessel, or supported or lifted within the vessel, and to lift at least an upper portion of the collapsible bag to convert the collapsible bag from a collapsed to an uncollapsed configuration and to support the collapsible bag in the uncollapsed configuration; and a motive device for vertically moving the lifting component relative to the assembly support structure, wherein the motive device further comprises a motor mounted above the vessel supported at least in part by the assembly support structure and mechanically linked to the lifting component a controller to control the raising, lowering, and/or stopping of the lifting component via the motor, and a strain interlock to prevent tearing of the collapsible bag that may be caught or obstructed during installation or removal.