The F-RP fabrication which prompted this study was a cross-flow scrubber used to remove HF and other contaminants from the gases off a series of regenerative glass melting furnaces by absorption in dilute caustic soda. The scrubber was 4 foot inside width by 12 feet high and approximately 32 feet long. There were two inclined vertical sections for packing filled with polypropylene spiral-type popular packing material. Design conditions of the scrubber were 18,000 CFM at a maximum inlet temperature of 200F and a negative pressure of 30 inches water column.

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