3. Possible explanations a) The gas is breaking through the liquid seals. b) Stacking of the liquid flowing across the bubble cap trays, forcing the gas through only a section of the tray. 4. Suggested liquid seal improvement’s a) Increase the seal pan outlet weir from 80 mm to 110 mm by adding a strip of steel. The strip should only be welded to the existing outlet weir and mounted flush with the absorber wall. The modification can be done from the PS3 distributor without removing it.