The search for a proper recovery pump..
- Thread starter HighStateToke
- Start date
Let me assure you, no labs are testing extracts for non-volatile residue contamination whether it's the 'mystery oil' from the butane or pump crankcase lube blow-by. I've discussed this repeatedly with them, they'll tell you if you will tell them specifically which chemical(s) you are searching for, and provide the money upfront, they will purchase the necessary reference standard(s,) and do the testing. It's all about the money to them.
PTFE is not permissible in extracts that could possibly be dabbed. Because I said so.
"Safety[edit]
Pyrolysis of PTFE is detectable at 200 °C (392 °F), and it evolves several fluorocarbon gases and a sublimate. An animal study conducted in 1955 concluded that it is unlikely that these products would be generated in amounts significant to health at temperatures below 250 °C (482 °F).[35]
While PTFE is stable and nontoxic at lower temperatures, it begins to deteriorate after the temperature of cookware reaches about 260 °C (500 °F), and decomposes above 350 °C (662 °F).[36] The degradation by-products can be lethal to birds,[37] and can cause flu-like symptoms[38] in humans. See polymer fume fever."
https://en.wikipedia.org/wiki/Polytetrafluoroethylene#Safety
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BigJohnny
Member
Either you coat the bearings/races in a PTFE film and/or use some kind of dry spray, like a dry graphite or dry silicone lubricant.
It can be sprayed on but once the delivery fluid evaporates all that's left behind is a dry (and slippery) film on whatever part you sprayed.
3bar (45psi) max output pressure. Might be useful for a first stage booster pump like the concept I proposed with the Gast pump, but not much use as a recovery pump.
Efficiency will drop off quickly as output pressure rises, so unless you build a very efficient aftercooler to keep output pressure low yer going to be disappointed.
GLDextracts
New member
Would a chiller coil be enough? I was looking at that pump today, I have 2 trs21 units and was thinking of doing dual recovery but a recovery pump that's twice as fast should be the same I assume. I was going to get the new bhogart or a cmel pol
The Gast was fast, but as RB notes, limited in pressure, so we used it as a primary pump and used a refrigeration pump for final recovery.
If you run the right mix cold enough, 45 psi should be adequate.
They are fussy to operate, in that they don't like to start under pressure, or pull vacuum while also producing pressure.
Attachments
Thank you for that, much obliged!
So In that case the cmep ol is still the best option? Unfortunate I hear consistent quality control issues, makes me weary about investing in the product. I'm in the progress of making my cls& trying to figure out how I should run. Passive vs active....
You might want to read this thread by jswick93: https://www.icmag.com/ic/showthread.php?t=318744
Some serious issues with the CMEP-OL
RB
I spoke with Sanitary Steel. They're working at getting ptfe coated bearings manufactured and said they'll be sending a pair to all of their past cmep-ol buyers. I'd imagine these will work for the application, the bearings never reach a temperature that would damage the ptfe I'd assume, and it solves the issue of grease. They said within 2 months they should be available.
Here at BHOgart we are going through some similar circumstances in regards to the CMEP-OL, we will release more information about upgraded bearings when we can provide an accurate timeline.
What we can say for sure is that our in-house technicians will doing the upgrades, we will not ask our customers to do it themselves. The manufacturer is stressing this, and we agree with their concerns. The CMEP-OL is not a simple pump to rebuild, and while some of you (especially here at ICMag) are perfectly capable of doing the work yourselves, the vast majority of customers are likely to damage their unit in the process. We have technicians with dozens of CMEP-OL rebuilds under their belt, we have the proper tools, and we have all the spare parts that we might discover need to be replaced.
What we can say for sure is that our in-house technicians will doing the upgrades, we will not ask our customers to do it themselves. The manufacturer is stressing this, and we agree with their concerns. The CMEP-OL is not a simple pump to rebuild, and while some of you (especially here at ICMag) are perfectly capable of doing the work yourselves, the vast majority of customers are likely to damage their unit in the process. We have technicians with dozens of CMEP-OL rebuilds under their belt, we have the proper tools, and we have all the spare parts that we might discover need to be replaced.
Update on CMEP-OL bearings:
BHOgart now has CMEP-OLs with the new PTFE bearings in stock, as well as the bearings themselves. The new bearings are designed by the CMEP-OL’s manufacturer, and just like the old bearings they do require grease. We have begun using them in CMEP-OL rebuilds, any pump that comes in for repairs will receive the new bearings.
Our pump technician has rebuilt over 60 CMEP-OLs at this point, and in our experience no pump that has been rebuilt has experienced another failure (yet). We attribute this not just to the quality of the rebuild, but the instruction on proper pump use that we provide when customers come to pick up their rebuilt pumps (which we also provide with new purchases). In many cases improper use (such as not elevating the pump, lack of a desiccant filter, improper desiccant filter orientation, etc) is the cause of failure.
We also repair pumps from any re-seller.
BHOgart now has CMEP-OLs with the new PTFE bearings in stock, as well as the bearings themselves. The new bearings are designed by the CMEP-OL’s manufacturer, and just like the old bearings they do require grease. We have begun using them in CMEP-OL rebuilds, any pump that comes in for repairs will receive the new bearings.
Our pump technician has rebuilt over 60 CMEP-OLs at this point, and in our experience no pump that has been rebuilt has experienced another failure (yet). We attribute this not just to the quality of the rebuild, but the instruction on proper pump use that we provide when customers come to pick up their rebuilt pumps (which we also provide with new purchases). In many cases improper use (such as not elevating the pump, lack of a desiccant filter, improper desiccant filter orientation, etc) is the cause of failure.
We also repair pumps from any re-seller.
What is the difference then in these new bearings if they require grease still?
$100 Labor + parts, if you purchased your pump from us then parts are free.
The new bearings were designed by the CMEP-OL manufacturer, they should provide improved longevity over the old bearings (claimed 1,500 hrs MTBF). We do not foresee a grease-less bearing solution for CMEP-OL in the near future, due to intrinsic limitations in the pump's design.
LostAlchemy
New member
Ordering the Bhogart diaphragm and heat exchanger this week. Will let you guys know how it works, looking at using co2 injection on the heat exchanger too, should be fun
Concentrated_
New member
This is the,first I've heard anyone from,bhogart mention to elevate the cmep-ol I had the first three I bought not hold vac, the two replacements have been running 8hrs a day for the last two months my spare I one I got back that was rebuilt by bhogart so my fingers are crosswd. Can you give me more,info on the elevated pumps, I recently remodeleded the space and have my pumps sitting on a folding table and, have added an expansion chamber and they run ten times better now I'm regularly doing 36# in 1.5 hrs with just melt ice.
Lifting the pump helps prevent liquid from forming in the pump, if this happens the liquid solvents will rapidly clear out the lubricant. This causes the pump to fail prematurely as well as contaminate your extract.
