Thank you! (Again).
Not planning on running cold. Recirculating out of my collection pot through my CRC and back to the pot.
I’ve played this game before using a debeem boxer.
Never saw pressures above 100psi. Will add a prv that vents to an evacuated solvent tank, and plumb the vent to the same location (assuming sucking on the vent doesn’t open the damn thing).
I like this…
I linked the opaline silica thread earlier, but having just re-explored it, I suggest skipping the first 130 posts and starting with
Feel free to crawl up thread, but start with the wizards explanation…
Thank you!
I read most of that thread prior to that comment back when it was originally made!
His explanation of recycling until reaching the desired color, was perfect…
I’m trying to recircuate thru ffe
Me too 
(Getting two birds stoned and all that…)
Not trying to derail the thread just saw a perfect opportunity to make a meme.
Please continue with the conversation.
The basic EXT420 design is a refrigerant transfer pump. that is the 59025 and its rated to pull both liquid and gas refrigerant. The EXT was dressed as a viton trimmed. parallel pump version of the 59025-3. We have never addressed the possibility of running butane through in liquid state since the pump has only been used for gas recovery from the heating of the collection vessel and cooling and pumping back to the recovery tank. If you guys have more process input I think we need to explore this… My partner Joe (FLWNW-710 is on vacation right now. I handle the straight mechanicals. He’s out in the field constantly and comes across all kinds of “what ifs”. I want to get him in on this thread asap.
Yeah they never warrant seals… But i did get them to take in a brand new 59025 that was short-stroking out of the box…
Yep This is new to me… Going to drag JJ into the thread when he gets back from Vakay…
How is the vent line controlled?
Will plumbing it to an evacuated tank cause it to vent when it otherwise would not?
Aro pump works fine
THANK YOU for asking that question, @cyclopath! Yes, @FLW710, please enlighten us on the ins & outs of these mysterious mechanicals!
There is a tapped port labeled “vent” so that’s maybe a good guess lol. There are technical drawings for all of these pumps that would say. I will say, the liquid pumps that have distance pieces leak into the distance piece which is not sealed/sealable. I also know it’s possible for process to leak into the drive section if the main seal fails which could be a problem
actually what I’d like to do is feed the thing hash…
…but I’ve decided I’m not up for that much learning this week, so I’m going to leave the hash pumping to the debeem boxer that I’ve used in the past.
I’m of course still curious: how bad an idea is feeding the ext420 hash laden solvent?
what are my likely failure modes?
The terps will destroy the seals 100% and allow tane to leak into the drive section. That’s what usually happens to them lol
Last I spoke with engineering they were working on a new main bearing seal package to handle the terps but I don’t know if it happened
Haskel engineering? or in-house?
if all it takes to make them hash-proof is some CNC-ed PTFE…I might have to make time for some learning after all 
Haskel engineering. Unfortunately those main bearings are pretty non-trivial to manufacture, PTFE would not be the ticket for a dynamic seal radial seal like that. Kalrez could be the “lazy” solution but it’s be mega expensive to get a custom made wiper seal like that and it probably would wear out quite quickly. There’s probably a specialty polyurethane that would work best and I’m guessing that’s where Haskel was headed but who knows.
They use ryton in the main bearings, wears decent but also keeps from tearing up the piston rod ($$$$)
dry dynamic seals are going to wear regardless Right? I ceasing shore/durometer is not the answer. Seal wear is a given in any pump. Over-cycling by trying to overcome back pressure with almost no inlet supply volume really tears them up. We just found that keeping a <60 CPM and regular Air drive maintenance make a huge difference
