Dual recovery pumps.

[Gray Wolf]

Can I connect 2 G5's to 1 mt69 or do I need 2 mt69's?
Anybody have pics of this setup?

I would use two or better yet, 50' of 3/8" stainless intead.

 

[icdog]

I'll likely get the 3/8 SS soon. Only have 1 mt69 and 2 g5's now.
Love to see a pic of 2 pumps at the tank and the coil.

 

[RHH]

A Promax 6000 can't stay with a Gast either, without help from an interim heat exchanger.

The pressure in the interim tank rises above 50 psi without it.

The interim heat exchanger dropped the pressure on the discharge side of the Promax about ~100 psi.

Part of the reason that the pressure rises that high in the interim tank, is that after long running, it exits the Gast hot, so in our current build, we have three heat exchanger coils in the same housing, and plan a counter flow heat exchanger at points of butane injection.

The central coil in the main heat exchanger is 50' of 3/8" stainless coil and the two outer heat exchangers are 20' of 3/8" stainless tubing. All plumbing connections enter from the side and exit from the bottom, so as to render the coils self draining.

The central coil is set up for liquid N2 injection, and the discharge from that line goes to 40' of 3/8" of stainless coil in the storage tank bath, before exiting to atmosphere.

The two outer 20' coils are for the diaphram pump and the recovery pumps discharge to their respective tanks, so as to lower pressures both places.

That leaves the center open for dry ice, if liquid N2 or liquid CO2 are not available to inject through the heat exchanger coil.

The reason for using a counter flow heat exchanger for the butane injection, is to keep the butane liquid and easy to pump at all location except the columns, where we want it subzero on demand.

Our counter flow exchanger will discharge into the storage cooling coil to get maxim refrigerant effects.

We've purchased or wrapped the coils and have the stainless shell drilled and ready for the welder if ya'll wanted to view it before it goes to him.

Photos are always appreciated. It seems simple enough though. What's your flow rate on that LN2? Seems like you would go through a lot.

 

[jpdnkstr]

Does anyone know if we can use the Yellowjacket XLT recovery pump? My concern is that it shuts off under 13" Hg....... I know this protects the pump, but won't work for our application properly, will it?

 

[Gray Wolf]

Photos are always appreciated. It seems simple enough though. What's your flow rate on that LN2? Seems like you would go through a lot.

Here is the first beta prototype Mk VB heat exchanger.

I will post the triple coil exchanger when the build is complete.

Flow rate to be determined from our N2 Dewars. It will start as a liquid and exit as a gas.

 

[Roji]

Does anyone know if we can use the Yellowjacket XLT recovery pump? My concern is that it shuts off under 13" Hg....... I know this protects the pump, but won't work for our application properly, will it?

I use one and it works great. Expensive though.

 

[flatslabs]

Yeah I mentioned before its a really nice pump, but the retail price is pretty high. I haven't seen the internals so I cannot say whether it is any "safer" than a G5 or 6000, so what is that extra price getting you is the question?

Since the Promax 6000 was just recently discontinued in favor of the new RG6 if you shop around you can get 2 of them for around the price you would pay for 1 yellowjacket XLT.

 

[icdog]

Anybody else have pics of a dual recovery pump setup?

 

[Gray Wolf]

Anybody else have pics of a dual recovery pump setup?

Here is a triple installed until electrical could be run for the compressor. They hook common 1 1/2" intake and discharge plenums, made of sanitary spools, using 1/2" lines.

 

[NorPene Solutions]

Here is a triple installed until electrical could be run for the compressor. They hook common 1 1/2" intake and discharge plenums, made of sanitary spools, using 1/2" lines.

Any photos of your intake/discharge plenums GW?

Ah, it's okay, finally wrapped my brain around it, got a picture in my mind.

 

[icdog]

More pics would be great. I am still working to setup 2 appions into 1 mt69 into 1 tank.

 

[NorPene Solutions]

I believe the MT69 will be too small and restrictive of flow to run double pumps through one efficiently once the butane starts to chill and become sluggish?

 

[Permacultuure]

We use the stainless3/8" x 25' after chiller to T the pumps. Running two tr21's may be a bit too much for one chiller, but two appions works fine...

 

[Permacultuure]

Here's an old pic but you can see how to t the pumps, ditch that mt69 asap

 

[Roji]

Heres my ghetto set-up

 

[icdog]

Will it work with one mt69 until i get the bigger after chiller? It will take a week or so to get the bigger chiller.

 

[HashoftheTitans]

Right now I'm waiting on my second tr21and am planning to use one of them for warm vapor assist during column recovery. I plan on pushing the warm vapor coming off of one of the pumps down through the column to the pot and recovered by the other pump and then valved off to finishing recovering the column separately after it has gotten enough heat from the pump. Has anyone tried this and if so what kind of improvement in recovery times did you see?

 

[Roji]

Right now I'm waiting on my second tr21and am planning to use one of them for warm vapor assist during column recovery. I plan on pushing the warm vapor coming off of one of the pumps down through the column to the pot and recovered by the other pump and then valved off to finishing recovering the column separately after it has gotten enough heat from the pump. Has anyone tried this and if so what kind of improvement in recovery times did you see?

I believe the tr21 pumps warm liquid not vapor.

 

[HashoftheTitans]

I believe the tr21 pumps warm liquid not vapor.

the pump produces heat and transfers that to the butane vapor stream as it exits the pump. The hoses exiting the pump and entering the heat exchanger are near a hundred degrees F. It most certainly pushes out warm butane vapor. Since the heat exchange is used to cool the hot vapor stream, I don't see why when running a second pump and recovering the vapor in the pot that we can't use some of that heat from the other pump to help warm the column from the inside by pushing the output of one of the pumps through the column for awhile to heat it back up after columns are drained during sub-zero extraction.

 

[Roji]

Ahhh. Gotcha. I use med temp recovery tank vapor to thaw frozen columns but I bottom flood it so it exits out the top vent instead of directly into my collection chamber, to avoid any waxes from getting from column to chamber.