Originally Posted by Calwax
i do have a shower end up on my top flood,
i do not have a bottom flood
I always feel like after i fill the system
dump the valve and start recovering that butane in the column just sits there and warms up and drips endlessly.
recovery of about 15 lb of solvent takes like 45 minutes.
i give one or two n2 pushes when recoverys closed then vent that out from the top of the column.
and thats usually when it just starts dripping slowly for forever.
when i restart the recovery
Even with a shower head, you need enough flow and volume to deal with a 6" X 24" column, which contains about 1629 cubic inches of material, so for a 3X flood, requires about 35lbs of LPG, as opposed to the 15lbs you are using.
What is your LPG supply line size? A 4" column is a push with a 1/2" supply.
If you don't have bidirectional flooding, I suggest you add it if efficiency is an issue. You physically cannot get the same degree of uniform wetting using just a top flood, unless you have more flow than will pass through the bottom dump valve, or it is closed, so as to fully fill the column from the top.
In that scenario, you also need a vapor vent to allow them to escape and not block the liquid.
It isn't necessary to use an N2 push on a properly designed system, and unless you remove it all, it seriously slows down recovery.
Here is how we successfully operated the WolfWurx Terpenators.