Downcomer seal guarantee

To guarantee a proper downcomer seal, the bottom edge of a downcomer should be about V2 inch below the top edge of the outlet weir. This dimension should be carefully checked by process personnel when a tower is opened for inspection. It is quite easy for sloppy tray installation to distort this critical factor. 

I have used inlet weirs to guarantee a downcomer seal at low liquid rates. But I ll leave a generous horizontal space (maybe 3 or 4 inches) between the inlet weir and downcomer A in Fig. 5.5 (i.e., distance X could be 3 or 4 inches). 

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See also in sourсe #XX -- [ ]

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