One thing i’m confused about is how much it has been said to pull a vac on your tanks. I’ve always been led to believe you want zero atmosphere in any component attached to your system which is why we vac everything, including our solvent tanks as deep as possible before filling or running.
Can you confirm this is a correct way to think? @Dred_pirate
For example my tank will be filled with 50lbs of solvent and maybe sit at 10 psi @ room temperature, and when I drop the temp of that tank to -75 it will be damn close to full vac regardless of how much solvent is in it. If I didn’t vac the tank before filling and left some atmosphere in there would that not condense from the cold and be creating pressure?
I’ve witnessed my dewax column filled to the site glass at the top (110% overfilled) and still reading a -25 vac with maybe 3 inches of headspace in a 2" siteglass head.
So surely, as long as I can keep my tank chilled to -75, and my collection/jacket can heat the solvent efficiently it should be screaming to get to that coil and tank.
I remember reading in summit closed loop 101 that running passively renders molecular sieves almost useless because you lose turbulence / starting and stopping of solvent through the filter. Is this old knowledge? Should I still run collection → mol sieve → coil -75 → tank -75?
Much appreciate all the knowledge in this thread. Definitely going to give this a shot and have a feeling like I won’t be looking back at active or rebuilding another fucking pump 