what is the best vacuum pump for BHO purging?

[vacpurge]

a lot of us use the vac it pro model, but there is tons on ebay that are a stainless steel bowl type for about 110-150$, with a nice lid. try to find a dish that is 1 gallon or so (unless you run massive amounts) and with a lid that is 1/2" or thicker.

 

[Bublonichronic]

I really like the provac 3 gal chamber, 3 gal is bigger than I need atm, but thats not a bad thing I don't think, best 140 i spet in a while...only have had it for like a month , but seems sturdy

 

[BluJayz]

On the other hand THC boils at relatively low temperatures in a vacuum. See attached graph, compliments of Skyhighler:

I used to use -29.9" Hg, but have backed off to -29.5" Hg to preserve them. Anything in the micron range would require super chilling the THC to preserve it.

What range would you say is safe for a micron rating to preserve the most terps, I'm starting to think 25 is too high.

 

[Fadedawg]

We only purge at -29.5 hg, which is about 319, 200 microns. At 25 microns, THC and the other terpenes are boiling at room temperature.

 

[BluJayz]

We only purge at -29.5 hg, which is about 319, 200 microns. At 25 microns, THC and the other terpenes are boiling at room temperature.

Maybe I asked it wrong, I've never seen a pump rated in the thousands. When muffing; and the vac is on and it's max pressure is 25 microns. Is't it going to go beyond the max pressure of -29 hg; even though it won't show it on the gauge?

Its this line of thinking that makes me reluctant to use a pump rated at 25 micron.

 

[DO3SHA]

Robinair 10cfm

Will rock any chanber or oven

 

[Fadedawg]

Maybe I asked it wrong, I've never seen a pump rated in the thousands. When muffing; and the vac is on and it's max pressure is 25 microns. Is't it going to go beyond the max pressure of -29 hg; even though it won't show it on the gauge?

Its this line of thinking that makes me reluctant to use a pump rated at 25 micron.

You may be looking at the number backwards and I seem to have lost my mind with that number.

25 microns is how much remaining atmospheric pressure there is left, starting at 760,000 microns. If you pull much below 10,000 microns (-29.5" Hg), you will be boiling the cannabinoids at ambient temperatures. http://www.engineeringtoolbox.com/vacuum-converter-d_460.html

 

[BluJayz]

Am I getting this right now?

So a pump rated at 25 microns will always pull ultimate vacuum at about -29.9hg period?

Where you want no more than -29.5; a 10k micron rating to keep thc boiling above 160f?

Also how is a 10k pump rated on the box, can't seem to find any examples...

I just got one of these (7cfm)
http://www.yellowjacket.com/product/948

Beginning to think it's the reason for darker stuff we been getting.

 

[Bublonichronic]

Just somthing I think"noticed...after I blast and scrape the initial hash and turn it into a beautiful blond/golden oil, when I go back and rescrape the stuff left behind in the pyrex it is always darker than the stuff scraped fresh and put in vac...my guess airation causes dark color??

 

[qwizoking]

Airation=oxidation
Run n through your vac...only way to really fix

 

[Bublonichronic]

Airation=oxidation

Oxidation smoxidation, that's the cause no? Aside from the fact didferent strains have different cannabinoid profiles?

 

[Fadedawg]

Am I getting this right now?

So a pump rated at 25 microns will always pull ultimate vacuum at about -29.9hg period?

Where you want no more than -29.5; a 10k micron rating to keep thc boiling above 160f?

Also how is a 10k pump rated on the box, can't seem to find any examples...

I just got one of these (7cfm)
http://www.yellowjacket.com/product/948

Beginning to think it's the reason for darker stuff we been getting.

Even a single stage pump will pull under 100 microns, so you have to bleed in air to keep it from pumping below 29.5" Hg.

 

[BluJayz]

Even a single stage pump will pull under 100 microns, so you have to bleed in air to keep it from pumping below 29.5" Hg.

I love you science; oh and you too fade.. lol

 

[Wildmans PNW Greens]

The robinair is shitty loses its power so fast go American made jb or yellowjacket and youll be set for a good long time i cook all my oils for nearly 3 days at 111.5 first day to 114.5 last day under a 28.5 pull i run my pump for 4 hours the first purge then burp re pull it and turn her off over night do it again next day im getting test at 68% thc with 16 % terps 2% activation pull to tear shatter ILL say this throw shit in to extract get shit out i run my smalls and a small amount of trim you can see my oils in Culture magazine the OIL Baron oils

 

[Doer]

Am I getting this right now?

So a pump rated at 25 microns will always pull ultimate vacuum at about -29.9hg period?

Where you want no more than -29.5; a 10k micron rating to keep thc boiling above 160f?

Also how is a 10k pump rated on the box, can't seem to find any examples...

I just got one of these (7cfm)
http://www.yellowjacket.com/product/948

Beginning to think it's the reason for darker stuff we been getting.

As I understand it (from Fade mostly) the dark is from the temperature.

For the pumps I think you may be missing some concepts.

This is a job of controlling temp and pressure.

My extractor came with a bleed valve. I have a CPS 6cfm, two stage. I can pull the system down to 100 microns or even lower if I risk buckling in my Butane jug.

So, I have a gauge at the boil off side and I use the charts and a laser temp measure, to put the system where I want it by using the bleed valve and the Cuisinart fondu pot (thanks, Fade, for that tip)

You want the pump stronger than you need and then bleed air to keep it at the pressure you want,

Helps?

 

[Doer]

Oh, I don't think the ultimate pressure on these pumps means that really. From reading it seem to be about how fast you can pull to rough vacuum levels....around 10K microns.

If you pull 25 microns on something it better be able to take it.

 

[goalie]

hey guys i have a robinair 15500 2 stage 5 cfm pump which is rated at 40-50 microns from what i can find online - is this adequate for purging my winterized bho or do i need lower micron?

 

[Doer]

hey guys i have a robinair 15500 2 stage 5 cfm pump which is rated at 40-50 microns from what i can find online - is this adequate for purging my winterized bho or do i need lower micron?

That will do you more that just fine. I have something very similar, the 6 cfm, 2 stage CPS. It probably could suck the chrome off a bumper.

So, you will need a bleed value to steady your pressure at some level like -29.9 psi.

What will you do with the alcohol? You can't just pump it through your pump oil. It will ruin the pump.

 

[Doer]

Strike that. I will boil ethanol at about 1 psi. To keep the temperature below 100F.

 

[PoptimusCrime]

yeah ordering online is the best thing ive ever done... and worst thing on my bank account. need something? anything, some random crazy weird piece.. find it in 2 minutes, pay tonight and have it shipped in the morning, providing shipping isnt a deal breaker, and you can afford to wait a week or so. I love it!!!! especially being in canada... your guys' prices in the states are fucking lowww!!! like 40% off everything, or more.

I was wondering I'm here in New Hampshire not too far away from Canada although I do live in Southern New Hampshire I just ordered a 5 gallon 7CFM Purge system with a one stage pump 4 $200 on Amazon I am a complete newbie and I would appreciate any of some of the great advice that I have been reading I f****** love this thread everyone is so chill no one is a douchebag I think everyone understands that some people have a lot more knowledge than others and they are actually willing to share and spoon feed this information two people like myself who don't know where to find such informative answers thank you everyone cheers and happy holidays