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You can let the packing manufacturers help with that. Packing height has to do with the strength of the packing (fragile packing can't withstand the compression). Redistribution is also used to introduce intermediate reflux streams or after intermediate product draws.

If all you have is dry air (N2, O2, Ar etc) with no appreciable water where does the Hydrogen come from? Are there sources of leakage into the system that contain hydrogen sources? Perhaps a leaking steam generator or superheater in the flue gas line. I've seen this type of problem before in...

Here's my take on those things- The whirly thing creates an air flow that removes the heat buildup in the attic space. The passing wind accross the vanes provides additional force to rotate the whirly head that is linnked to a fan blade mounted in the throat. In the absence of any wind, the...