Refrigerant Recovery Pump Updates

Some excitement for closed loop extractors looking for an electric refrigeration recovery pump rated for R-600 refrigerant and more good stuff from Haskel!

We are testing a electric new pump named the CMEP-OL that was designed specifically for our cannabis market, which is certified for use with flammable solvents, meets our process requirements, and has so far stood up to our field testing.

We just moved it to the third production lab for continued field beta testing, with a thumbs up from the first two, a note that they are quieter than either the Appion or the TR-21, and faster than two TR-21’s in both of their applications.

We are currently running it in the field in as continuous service as possible, to rack up hours and tests its ability to stand up to our use and abuse, and so far, so good.

We of course continue to recommend and rely on the pneumatic Haskel 59023 double stage and EXT420 single stage, which Haskel will now offer in a -2 configuration that is switchable from single to double stage using a single two way valve and two check valves.

WolfWurx already converts both of the existing pumps to selectable single or double stage, using two three way valves, which is more complicated, though ostensibly with less back pressure without check valves. At least one other operator I know has converted his to selectable stages, using four two way valves.

The Haskel’s single drawback is its air consumption, but we have exciting news! The first, but old news, was that the Haskel performs most of our tasks single stage, so we almost double the output, and now the new news is that we’ve also determined that the Haskel never requires its full rated 100 psi pressure or 40 scfm air flow to meet our performance requirements at their recommended 60 strokes a minute.

We don’t have enough back pressure on a Mk VB installation to require more than 50 psi even running single stage, so we end up needing only about 25 scfm at 50 psi, or about a 6.25 hp (7 1/2 hp) screw compressor, rather than the 10 horse required for full pump capacity.

The big difference that makes, is the selection of single stage screw compressors increases at 7 1/2 hp, and they use less electricity.

For smaller installations, many of us have searched for an electric oil less refrigerant recovery pump that is rated for flammable refrigerants, and many use the non NEMA 7 rated electric Appion G-5, the ProMax-6000, the CPS-TR-21, and TRS-21, simply because they work.

CPS delighted us recently with their offering of the TRS-21 sparkless, influenced by our markets needs, but not certified for use with R-290/600/600A. It currently appears to be struggling with infant mortality with the new pumps seals, and we await their solution.

Here at the Pharm, we’ve also tested the R-290/600/600A rated CMEP loaned to us by Ecogreen, which performed well testing machines, but alas was not oil less, and are now testing a CMEP-OL, NEMA 7 oil less refrigerant recovery pump on loan from

Here is a picture of four pumps, left to right, the Appion G-5, the CPS-TR-21, the CMEP-OL, and the CMEP.

The Haskel that follows, is on WolfWurx, Inc Mk V waiting to be converted to selectable single or double stage, with a picture following of a unit converted using two three way valves.

Zee Pumps-1-2zee pumps 001Haskel 59025-3

Haskel plumbed selective stage

Haskel 59025-3 converted to selectable single or double stage using two three way valves. Haskel offers the EXT420 single stage and soon will offer their EXT420-2, which is selectable single or double stage, using one two way valve and two check valves, engineering test sled picture below:

Haskel EXT-420-2 prototype test sledHaskel EXT420-2 prototype:

Sorry, but just too too much has pushed us’ns over the edge on open blasting!

I’m sorry to say that I just removed our instructions on how to do BHO extractions using an open tube, after us’n three SPR partners unanimously agreed that too many brothers and sisters are ignoring all warnings against indoor open blasting, and the havoc they are wreaking is causing us to all be painted with the same brush as sociopathic idiots.

I left the parts not relating to open blasting, including butane safety, which is applicable to both open and closed loop extraction.

There are ample sites demonstrating how to open blast, so ours is not needed.

Sorry it came to this!  I note it is always the few that ruin things for us’n masses, but don’t know how to fix it.

Domestic Butane

Whoop, whoop, lu lu lu lu lu lu lu lu lu, awhooooooooooooooooooooooooooooooooo!!!!!!!!1

Medical extractors looking for a domestic source of 99.5% Instrument grade n-Butane will be gladdened by the latest gas supplier to announce a domestic source at competitive prices, replete with Praxair tests and certifications.   99.99% scheduled next.

You have to buy to own your first LP5 (24lb) or FX1 (120lb) tank, and then continue to swap it out.

Contact J Coltrane for pricing and delivery, at


We sent a sample of  Coltrane/Praxair 99.5% Instrument Grade n-Butane to a third party analytical lab to determine the contaminant levels of molecules larger than C-4, ignoring molecules smaller than C-4 because they are not of concern to us for our process.

The lab determined that the parts per million contamination was below their test cut off of 0.2 ppm, so this information was minimally useful.

We subsequently distilled off 10# of it into a new Lp-5 tank, and passed it through a VICI Metronics polishing filter.  We noted that after distilling 10# in a 12″ X 12″ recovery pot, that there was only a light film on the inside of the pot, with no droplets or puddles.  Sadly, the weight of the oil would be minuscule compared to the weight of the cold trap, so simple weighing is not possible, so we will again rely on a state certified third party forensic lab.

Dropping those off this morning and this time, we will have the remaining virgin n-Butane analyzed using a GCMS to the PPB level, and test the distilled and polished butane to glean empirical results on the efficacy of our process.



Free Open Source Dosage and Pricing Software!

Hee, hee, hee, here is a good idea at the right price!

Periodically brothers and sisters send us stuff to try out and comment on. Leblanc CNE is one whom just sent us some free open source software that they’ve written for calculating individual dosages, as well as software for establishing pricing, based on costs and markups.

The joy of both is that you can change any number and it will update the rest, so it makes it easy to also play, “What if?”

I think it’s cool, and suggested posting it on SPR for more people to try and provide feedback to, which they agreed to, so here it is folks:

First we have the dosing software:

Here is the pricing software:

Here is where to leave direct feedback to the fine mind that created the software and provided it for your whim and pleasure free:

Poisoning the well!

Joe and I have both spoken out against sub standard and unsafe extraction devices, but how about those suppliers whose marketing plaudits, include poisoning the well for their competition with exaggerations and untruths?

Suppliers with such a low opinion of their own product, that they don’t feel up to competing based on their own products attributes, so they make a concerted effort to shoot down the competitors product using a tapestry woven of truths, half truths, and untruths.

Joining MO in that regard, we now have Connoisseur Concentrates with Mr Extractor, whom paint their competitors as intentionally poisoning the public.

They present their machine as the safer alternative, yet publish a video demonstrating extracting indoors, with out a properly ventilated extraction enclosure, a never, under any circumstances NO NO.

If they are the safer alternative, what does that make the rest of us?

Compounding the egregious blunder, they also didn’t first vacuum the oxygen from the extractor before injecting the butane.  They instead floated the oxygen laden atmosphere out and burped it out into the room.

Please ask your local fire marshal’s views on how safe he thinks that is.

In point of fact their “safer” machine didn’t even have a vacuum connection for a pump, as do both the Tamisium and Lil Terp they present as inferior.

We touched swords on IC MAG forum, ( Drew left the field to avoid answering the questions listed below.

I see them germane to the question of whether Mr Extractor is indeed safer and ahead of the industry, or whether they are just a rip off of the Tamisium and Lil Terp, adding a glass sight glass unlikely to meet ANSI/ASME in this application.

Certainly the jackets are handier than buckets, but are they safer and what in Earth justifies the $6000 markup over the cost to assemble a Lil Terp?   Is it the attached jackets to avoid using buckets.

What justifies the added cost over the Tamisium TE-175 at about $1800?

The questions begging an answer, and being avoided, are as follows:

(1) A yes or no question. Do you have a ME PE stamped document certifying Mr Extractor to meet ANSI and ASME?

(1.1) May we see a copy?

(2) Now may we talk about finishing. Would you share with us how you recommend finishing the material from your recovery pot to meet current residual solvent standards?

(3) Do you have any reputable third party lab analysis of product demonstrating the common deposits of metal and PTFE piston ring material in extractions and if so, would you please share?

(4) I am most curious about your use of 9mm borosilicate tube for the extraction tube, which we too looked at because it is so obvious, but decided to not pursue it after considering the effect of shock sensitivity during sharp temperature gradients.

We even looked at having the glass coated inside and out with clear PTFE for the added safety, but decided it wasn’t a good idea to have a pressurized glass vessel with flammable gas inside.

Sort of along the same lines of why the gas station won’t fill your glass jug for you.

(4.1) That leads me to the subject of liability insurance. May we see a copy of your product liability policy and contact information to your carrier?

Drew also claims superior performance, but has failed to address the following observations:

1.0 The pumped system is considerably faster.

2.0 The pumped system evacuates the oxygen before injecting butane, so that there is never an explosive mixture.

2.1 Since Mr Extractor uses no vacuum, the passive system mixes the butane with atmosphere as it is injected and floats the explosive mixture out. It is vulnerable to ignition and explosion during that process.

3.0 The system is recovered to -22″ in a pumped system, so only 25% of its volume in vapor is lost.

3.1 100% of its volume in vapor is lost when opening a passive system.

4.0 An active system recovers most of the butane soaked into the material in the columns, by vacuuming to -22″Hg. The pumps are unable to achieve that level until most of the butane is gone.

The last 25% between -22″ Hg and -29″ Hg, is subsequently pumped off using a vacuum pump, so when the columns are opened, there is not an explosive mixture.

4.1 The passive system not only doesn’t recover the butane soaked into the material to the same levels as the active systems, but when opened the columns are definitely within explosive limits.

Because it leaves the butane in the material, losses are greater.

5.0 A pumped system can pass more fresh clean butane through the material faster, and in both directions, so ergo it extracts faster and more completely.

6.0 You can recover a pumped system recovery pot at 31.9F, so as to preserve more carboxylic acids and aromatics.

6.1 Even using dry ice, you are still using a hot water bath with the meds in it, utilizing passive techniques.

7.0 An active system easily pre-distills butane at 85F, to remove residuals including Pentane, which boils around 100F.

7.1 Recovery at 85F using a passive system takes much longer.

8.0 An active system offers more latitude for propane mixes.

More MO action!

Check the latest on MO melodrama at:

DIY Rotary Evaporator by Siskiyou Sam

Hee, hee, hee, don’t you just love synergism?

I posted  a rotary evaporator design based on available sanitary spools at the time, but didn’t build it because better options were becoming available, and Siskiyou Sam took the challenge and built one of his own design.

He has consented to share, so here tis:

More at


Get every new post delivered to your Inbox.

Join 3,919 other followers