Setting up another material column to my system

[cyclopath]

I suspect they are rated for 200psi at best: Propane VS N-Butane extraction - #16 by cyclopath

have you noticed your pressures change over time? (as that solvent ratio changes on each recovery). you can use tank temp & pressure + math to figure out today’s ratio…or even adjust it to yesterday’s.

70/30 solvent refill

if you want to maintain that 70/30 blend. check the engineering toolbox. you can tell what’s in the can based on temp and pressure (assuming you’ve not added nitrogen, or air at some point) top up accordingly. (using a scale).

rack your columns & run 3/8" (or 1/2" if you’ve got the $$) SS over teflon lines (with valves) from the bottom of each column to your collection pot. I would run sequentially.