Why does Koch-Glitsch insist on draw sumps instead of permitting the draw nozzle to be flush with the chimney tray floor?
Draw nozzles can be quite large – maybe 12″-14″ in diameter. Generally, the depth of liquid required to provide the head necessary for the liquid flow rates is about equal to the nozzle size. Thus, this depth is not usable at design flow rates -only at reduced flow rates. This depth of liquid imposes a loading up to 40 Ib/sq ft on the chimney tray and requires a taller riser height. The use of draw sumps reduces mechanical strength requirements, lowers the riser heights and may permit a shorter tower.
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