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 Sanitarysteel.com.
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.
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: