Liquid Tank Weld Cavitation Protection.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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This patent discloses devices for protecting an edge weld of a thin metal bladder, which is positioned within a rigid walled tank, against a cavitation-induced collapse where the configuration of the interior surface of the bladder at the edge weld is in the structural form of a cavity which is horn-like in shape. One such device is backing made of hard and ductile material which is interposed between and is in contact with the exterior surface of the bladder and the interior surface of the rigid walled tank at a location adjacent the edge weld of the bladder. Another is a T-shaped ring disposed internal of the bladder, with the normally vertical leg of the T-shaped ring inserted into the horn-like cavity, and with the normally horizontal leg of the T-shaped ring positioned across the cavity ad in contact with the interior surface of the bladder at a location adjacent to the cavity. Even further, a hard material is fixedly positioned in the horn-like shaped cavity, thereby filling the cavity. Finally, a portion of the bladder is formed with a void at the innermost terminus of the edge weld, and a passageway interconnects the void and the liquid in the bladder.
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