Support beam packed column

In large-diameter columns, gas-injection support plates have the additional advantage of minimizing the number of midspan beams required for supporting the support plate or grid. In metallic application, alternative support t3q>es require two to three times as many support beams 2is the gas-injection plate (74). The author and others (74, 111, 166) recommend specifying gas-injection support plates whenever possible in metallic and plastic random packing applications. 

Prrted by the vessel shell. Sand filters, packed columns, and reactors with catalyst beds are typical examples. The beds are often supported by a combination of beam(s), grating, and a circumferential ring which supports the periphery of the grating. The beams are in turn attached to the shell wall by either clips or beam seats. This procedure offers a quick way for analyzing the various support components. 

In columns 72-in. or larger diameter, the packing support plates usually are clamped to the supporting ledge at both ends. This prevents movement of the individual beams during operating upsets that could allow some packing pieces to fall out of the packed bed. 

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