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Hold down plates rest directly on the tower packings and are normally recommended for ceramic and carbon random packings or where no tray support rings is available. The opening sizes can be varied to suit various packing sizes and the beams can be designed to support a prescribed man-load. The major advantage of using this type of movable, anti-migration screen is to reduce the crushing of tower packing during surges or bed expansions. Hold down plates are held in place by providing weight bars and do not require any type of clamping arrangement.
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