Dual recovery pumps.

[Roji]

Is anybody else using two recovery pumps?

Tried my new setup for the first time today. It pulled 7.35lbs of butane in well under 15 min. using my new 3/8 vapor hoses. Waaaay fast for what Im used to.

Oh, and yes, the Yellow Jacket is an awesome pump. It's not the holy grail youre all looking for but I'd say its faster than my appion.

 

[RHH]

Got a question here: anyone running dual TR21's? Dual appions can't keep up with the Gast. I tried tr21+appion but it kept hitting the high pressure shutoff... presumably the hoses are too small or the tr21 overpowers the appion where they tee back together before the tank.

Its a solvable problem...just wanted to know if anyone found a clever solution.

 

[RHH]

Also, get rid of that hotplate and get a bucket heater.

 

[Permacultuure]

Got a question here: anyone running dual TR21's? Dual appions can't keep up with the Gast. I tried tr21+appion but it kept hitting the high pressure shutoff... presumably the hoses are too small or the tr21 overpowers the appion where they tee back together before the tank.

Its a solvable problem...just wanted to know if anyone found a clever solution.

Temps might be too high considering how the tr21 is designed. Are you running a heat exchanger after to tr21? Temps could be so high that it triggers the pressure shut off. Those gast setups seems to be so pressure sensitive that the heat exchanger way be a crucial element.

 

[icdog]

How long did it take with just one recovery pump? Which size column?

 

[Gray Wolf]

Got a question here: anyone running dual TR21's? Dual appions can't keep up with the Gast. I tried tr21+appion but it kept hitting the high pressure shutoff... presumably the hoses are too small or the tr21 overpowers the appion where they tee back together before the tank.

Its a solvable problem...just wanted to know if anyone found a clever solution.

The TR-21 runs hot and sets off high limit switches, so we added heat exchanger.

 

[flatslabs]

Hey Roji, which YellowJacket pump are you using?

I have a friend that is using one and his case is the same as in your picture but it is a different color on the front. He told me one is oil-less and one isn't so I hope you (or he) are using the correct one.

 

[RHH]

Temps might be too high considering how the tr21 is designed. Are you running a heat exchanger after to tr21? Temps could be so high that it triggers the pressure shut off. Those gast setups seems to be so pressure sensitive that the heat exchanger way be a crucial element.

This is with a single 3/8" 50' heat exchanger that both pumps teed into. Next up I'm going to add a heat exchanger and tee them together *after* the exchangers. That brings me up to 2 chilled tanks and 3 heat exchangers. What a life.

 

[Roji]

Hey Roji, which YellowJacket pump are you using?

I have a friend that is using one and his case is the same as in your picture but it is a different color on the front. He told me one is oil-less and one isn't so I hope you (or he) are using the correct one.

Mine came from a refrigeration wholesaler on sale as a floor model so it may be older and have a different appearance.

It's the XLT oil-less compressor.

Heres the link. http://www.yellowjacket.com/node/637

 

[~Alaska~]

How loud is it compared to the appion etc?

A

 

[Roji]

It is actually quieter.

 

[jpdnkstr]

Has anyone had to rebuild one of the yellow jacket pumps yet?, I have heard that the appion is the easiest to rebuild(over the CPS). I am going to be purchasing a recovery pump very soon, and would greatly appreciate any input.

 

[pnw bb]

Im using two diablos side by side and am experiencing the exact opposite. 15 min seems insane! it takes me roughly an hr to do that. with my collection vessel at 80 degrees.

 

[Permacultuure]

This is with a single 3/8" 50' heat exchanger that both pumps teed into. Next up I'm going to add a heat exchanger and tee them together *after* the exchangers. That brings me up to 2 chilled tanks and 3 heat exchangers. What a life.

two appions can't keep up with your gast? Is this because of the heat exchanger/exchangers? I remember sneaky and gw saying that the promax only cuts on when necessary. Trying to design the layout for my gast thats been sitting for a month plus. I know I need to incorporate heat exchangers but felt that a 25' coil would be sufficent. Have you ran it with a 25' coil?....sounds like I've been underestimating the gast...

 

[Gray Wolf]

two appions can't keep up with your gast? Is this because of the heat exchanger/exchangers? I remember sneaky and gw saying that the promax only cuts on when necessary. Trying to design the layout for my gast thats been sitting for a month plus. I know I need to incorporate heat exchangers but felt that a 25' coil would be sufficent. Have you ran it with a 25' coil?....sounds like I've been underestimating the gast...

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.

 

[JColtrane]

GW you always make my morning coffee better, thank you brother

 

[icdog]

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

 

[pnw bb]

just fyi I just timed my last run and it takes me 5 min to recover 1 pound of 99.9 n-tane with my collection vessel at 80 with two diablos fed by 3/8" and exporting with 1/4" and no heat exchange after the recovery pumps.with my solvent recovery tank in a wet ice bath.

 

[icdog]

How do you measure that it recovers a lb?

 

[Roji]

You either measure what you're putting into the system or you weigh the recovery tank with a refrigerant tank scale.