On dunking buckets passive, yes. With nitrogen assisted, it’s unnecessary, especially if you have a rack mounted system.
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If you’re cold enough the whole time, you’ll still fill the collection vessel, correct. But there’s definitely more holdup volume in the material column without some “pull” from the collection vessel - in my experience. Why does a rack mount make any difference in backpressure from the collection vessel?
I run rack-mounted, nitrogen-assisted.
I’m saying you can’t dunk a rack mounted one, is all.
Hello all. Opportunist followup question to those willing to answer. I recently started using nitrogen in our ETS as well… So what are the potential harmful effects of nitrogen on your extracts if any at all? Has anybody noticed anything? Also @Dred_pirate an excess on pressure will cause issues with an ETS above 60psi? Is there anything in your expirience that on should be diligent about keeping an eye on?
Was wondering if anyone could assist on passive recovery. If I were to change up to a larger hose diameter from the collection pot to the recovery tank. Would the bottleneck still occur do to the 1/4" recovery port on the lid? Or will the hose diameter increase still help with the recovery movement?
Thanks.
The hose diameter will help increasing your speed but the 1/4" will always
Be a bottle neck
Question remains if you have enough condensing power for it to be obvious
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Awesome sauce! I need to benchmark the recovery times. Then might throw some more $ at and bench mark again.
I just know there is a large difference in theory and practicality, and this isn’t my main science… yet 
Thanks!
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Nitrogen is an inert gas. It won’t change phase back into a liquid and make it into your concentrates.
ETS systems are rated to 350psi, 60psi of vapors shouldn’t even effect the equipment in any way.
Depends on the pump you have, the seals may not handle nitrogen vapors going through them. I know cheaper pumps aren’t fond of nitrogen cycling through the pistons
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I have two half inch recovery lines on my system.
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From what I’ve read. You’re the passive master @Dred_pirate!
I just recently acquired a small 1lb CLS system to get my feet wet. My only experience has been on a cheap closed column.
I dont plan on using a recovery pump. My niece for some reason wont operate hers with out her recovery pump (its broke). So hoping just to try and beat her old pumps recovery time. If you want to know the honest truth 
I’m still working on building a rack for it.
I’ve done a lot of reading on the nitrogen push, and considering doing it as well. But not until I get the regular passive techniques down to a science. Then work on increasing operating efficiencies. Hence the bottleneck question.
After I get my technique down with the equipment I have. I’ll see about upgrading that line just to see what happens!
I truly appreciate all the great feedback and knowledge sharing on this site. And look forward to many days of experimenting. 
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Thank you for taking the time to reply. Just dotting my I’s and crossing my T’s so to speak. All of your feedback lines up with my expirience so far. A slight misread on my end. Thank you again.
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That hot looping right there is tip of the year for me. Thank you brother. I put a qc on as soon as I found this. Gunna give it a whirl tomorrow
So what if I’m using just head pressure from my recovery tank that is being chilled I have say 30psi and wanting to push any liquid out it is dried thru mole sieve and chiller thru condenser and being recirc thru chilled heat exchanger.
My columns will be pulled down from liquid pumps and only couple psi. Seems to do fairly well but being HVAC tech I have nitro and have used it but not since I just started using my head pressure. I like the thought of chilled gas from r/t is my best thought. IDK I’m just learning
Thanks for time and knowledge! This is great community.
With the T running for how long and how many pressure are you pushing through this line?
Last seen in ‘19…
As long and as hard as you need.
That tr21 has a450psi cut off. You do nt want to go anywhere near it (50-75PSI is plenty)