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Toker95
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How cold is your recovery tank? It will pull a vacuum if it is cold enough.
Stick it in hot water and open the vapor valve. Here are the the pressures at different temperatures and mixtures.
Yeah Nice chart GW slightly confused on how to utilize it..this keeps happening to us lately. Only since it started getting cold out. Want to make sure I'm following you guys. Say I open the valves to let the solvent run through my tube and it stops flowing, is it because of pressure problems? We seem to only be able to fit a third of the needed gas solvent in our tubes, whether they are the 5lb or 2lb tubes, with three more subsequent soaks if possible. Do we need to keep the solvent tank warm while letting it flow; or shut off the liquid valve to stop solvent flowing through it, put tank in warm water, subsequently opening vapor valve to release gas and lower pressure? Or do those tubes only hold so much? Been pondering this one for a while now. Hope those questions make sense.
I'm having a problems getting liquid out of my tank. Normally I start with 9 lb. 4.5 holding and the other have on the chamber. A 3rd recovery of 4.5. Now I be lucky to get 7 lb and 2 lb max on my 3rd recovery. Why is that I have no pressure¿. I been getting my buttabe N in dry ice baths to do shatter. Now the days my ovens are full I'm just blasting for clear but my tank ( already out of the ice n at room temperature ) seems to have no pressure. ????
Thanks. How long are they? And how do you move the N2? Is it a liquid or gas as it enters the exchanger?I couldn't find 1/2" counterflow heat exchangers with a .049 wall thickness to meet ASME for LPG, so I had them wrapped by Albina Tubing in Tualatin, OR. I used a 1/2" X .049 304SS inner tube and a 3/4" outer.
I finished them myself using Swageloc custom tees, with 3/4 X 1/2 X 1/2 ports. I then drilled through the straight through 1/2" port so that the 1/2" tube would slide through it. That allows the end of the 3/4 leg to swage on one port and the 1/2" tube pass through the other port and be swaged along its length.
How do you transfer the liquid? A pressure building tank with dip-tube? And how do you throttle the flow? Do you have any idea how much N2 you're using, to compare on a small scale? Sorry for my ignorance.They are 20' each. The N2 enters one end as a liquid and exits the other a gas.
We use a Dewar with a dip tube valve as well as a vapor valve.How do you transfer the liquid? A pressure building tank with dip-tube? And how do you throttle the flow? Do you have any idea how much N2 you're using, to compare on a small scale? Sorry for my ignorance.
Fyi, my lil' Terp clone has a 2x36 column with 6x6 pot (no dip), a little mismatched I think.
Thanks. I use about 1/2 to 1/3 of that column for a crumbled coffee-filter stack, so it's just the volume and pressure issue. I matched my working supply tank using calculations from one of the build threads on your blog.We use a Dewar with a dip tube valve as well as a vapor valve.
I used a Swageloc valve on the discharge to throttle the flow, but you have to do it before much flow transpires, because it becomes inoperable fast.
You could also use a fixed orifice. You can never close it off completely, because of the pressures that can be reached when the liquid warms to gaseous state.
A Lil Terp doesn't need a dip tube, but that is a huge column for that size lower tank.
3x, roger that, explains everything. Not sure how I missed this all along :facepalm: Things get better!The 6" X 6" spool works well with about a 1 1/2" X 24" column. Not quite enough volume for a 3 volume flood from a 36" column.
@Graywolf, hey buddy been following you for years not sure if your still engaged in this thread but I'll shoot anyway! I'm freezing my 1000 lb by water weight butane tank 70iso/30n butane to -28 c in a walk in freezer, the goal is to also freeze the 100lb material chamber loaded with fresh frozen or frozen trim to produce some pristine extract at a higher volume. Working on color by freezing water locking out chlorophyll and coagulating waxes in the material colum, and also preserving terpenes. I need pressure but have been told back filling with compressed nitrogen even regulated to a low pressure will cause a reaction inside the tank resulting in catastrophe, the other solution adding propane to the mix. Any ideas or solutions to get my very cold gas flowing?
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