Raschig - Side-to-Side Baffle Trays and Disc & Donut Trays

These two tray types are located inside a column in such a manor that the liquid and vapour are brought in to direct contact by forcing vapour through falling liquid. Liquid descends from one tray to the next either as a curtain of liquid raining down or as liquid rivulets passing through holes in the tray deck. Tray panels are flat or slightly inclined decks that occupy 40-60 % of the column cross-sectional area. Designs containing panels with holes are usually 40% open so that there is sufficient overlap between plates stacked one above the other. At a given tray spacing, both tray types offer a higher capacity and lower pressure drop compared with conventional sieve and valve trays, and in some cases dual flow trays.