Item Model/Manufacturer:
Media - BeHe Video : Photo - Dropbox
did you have it running?
Yes, everything works great. We’re pivoting away from producing CBDa Live Resin.
Such a gnarley machine
17 posts were split to a new topic: Whats the accurate real world statistics on Illumintated Extractors
what a gorgeous machine 
Hey I was looking through the Dropbox pics and noticed the two Corken T291s plumbed together in series in the back, plus the larger Corken in the foreground. Can you explain what the story is behind that compressor setup?
Were the two T291s being used as staged utility compressors, with the larger Corken handling process vapor recovery?
I’m curious whether they were intentionally run in series for more pressure/temp lift on the utility loop, or if that was specific to this install. Any details on how it was configured or how it ran would be appreciated.
do you have some fire thca live resin to sell?
Those two T291s were not there as some separate experimental compressor stage. They were being used as a replacement for a Corken 391 because a 391 was not available in time to meet the client’s deadline.
So rather than miss the deadline, we built the closest functional equivalent we could with the compressors that were available. In simple terms, we made our own 391-style utility compressor package out of two T291s.
The larger Corken (591) in the foreground was handling process vapor recovery. The paired T291s were on the utility/refrigeration side to replace the would-be 391.
So technically, the 2x 291 were an under-rated 391 (1.16 lbs/min vs 1.7 lbs/min at 0psi inlet / -44c) but would still get the job done and not fall apart after a month of operation (single stage compressors are not designed for two stage work - we had to make hardware modifications - aka flipping specific packing & adding a vapor path to the right zones).
Corken supported the project and verified that it would work as expected before we made the leap.
Clearly the 391 is the right choice if it were available at the time. Sometimes you gotta make due with what is available. 
391:
VS 2x 291:
For series 291 the second stage doesn’t matter so much since it will only see the vapor from the first stage, but since we are comparing apples to apples I figured I would supply the data on the second stage compressor as well… 5.8 lb/min can easily eat 1.16 lbs/min, bringing the working pressure up to 150psi from the inter-stage pressure of 45.8psi.
The problem is heat generation… a single stage compressor is not designed to lift 0psi or even -10psi to +150psi. That will get hot as hell and burn out the rings/seals.
BUT for a two stage compressor, that lift is only -10psi to 45psi for the first stage, then 45psi to 150psi for the second stage… much smaller jump than -10psi to 150psi. Much less work and therefore much less heat generated. Mass density of the gas is so small there is not much heat to begin with under vacuum.
It was not better than the real 391 package. It was a practical substitute because the actual 391 was not available in time, and the substitute got close enough to meet the operating need.
So we made a 2 stage compressor from two single stage units. 
Ok, so if I’m understanding this correctly:
The 591 handled process recovery.
The two staged T291s were a deadline driven workaround on the utility/refrigeration side because the intended Corken 391 package was not available.
They were not a performance upgrade or some separate experimental feature. By your own numbers, they were an underrated substitute for the 391 package the machine was designed around.
Since this sale listing appears to show the machine still configured with the paired T291 package, does that mean the utility/refrigeration side is still below the original 391 design spec?
And if so, what practical limitation would a buyer see compared to the intended 391 package?
Still meets design spec. The 2x 291 package moves 0.534 lbs/min less than a 391 at -44°C / 0 psi inlet on paper — roughly 1.7 kW less propane cooling capacity. In practice that’s a few extra seconds on pulldown. Throughput, solvent recovery rate, and achievable evaporator temperature are unaffected.
Worth noting the 0.534 lbs/min delta is likely conservative — Corken’s sizing software doesn’t model a true two-stage 291 series setup the same way it models a native two-stage compressor, so comparing it against the 391 as two single-stage events understates what the staged configuration actually does in operation. Corken themselves verified the package would perform as needed before we committed to building it this way.
So no practical limitation a buyer would feel during a run. If a future owner ever wanted the standard compressor, dropping in a 391 is straightforward.
You spent over a 1 million on that and now your pivoting away from CBDa im sure some investors are not happy.
Hi Devin,
The machine interests me, is it still available for sale?
Sincerely
