2 Stage 3 CFM Vac Pump ANd only getting about -23HG

Fuck Snails

Fuck Snails

Active Member
So I bought this vac pump ONLINE for $120

The listing said it was 3.0 CFM 2 stage.
I'm only pulling -23HG with it, and i think i might have got sent the wrong pump.
How much on average should a 3.0 CFM 2 stage pull? At least -30 right?

I've still got time to return the pump or replace it for the right one so I'd like to make sure I get what i paid for.
 
SnapsProvolone

SnapsProvolone

Well-Known Member
Altitude is a factor, however I wonder if the gauge is accurate. I'm at 5000' altitude and my single stage pulls a -24 but that's just according to the gauge that may or may not be accurate lol.
 
oilmkr420

oilmkr420

Active Member
I was told to be happy w -26 Hg w a knf explosion proof vacuum pump or to hook a second scrubber pump to assist in pulling more vacuum. Just feed one output to the input of the other, then to the desiccator, oven, chamber, whatever your availability(rotovap). You should be looking into 3 phase vacuum pumps. At 400 cycles you can't pull outer space, but -28 is doable. Also as the heat in the area warms, the harder it is to pull vacuum. If you turned off the heat and pulled more vacuum, as it cools and taking theres no leaks, the vacuum will increase as the temperature lowers. You guys relying solely on tane haven't much to worry about destroying terps, since largely what you have is flavonoids and some cannabinoids. So unless your targeting terps say chloroform by a small dropper to the extract, you just got regular old bho. Freon like r-134a and r113, thanks Dupont for your worthy contributions as I am a big fan. R22 too!!!
 
oilmkr420

oilmkr420

Active Member
Fuck Snails said:
So I bought this vac pump ONLINE for $120

The listing said it was 3.0 CFM 2 stage.
I'm only pulling -23HG with it, and i think i might have got sent the wrong pump.
How much on average should a 3.0 CFM 2 stage pull? At least -30 right?

I've still got time to return the pump or replace it for the right one so I'd like to make sure I get what i paid for.
Click to expand...
How many cubic feet is your chamber to reduce pressure?
 
Fadedawg

Fadedawg

Well-Known Member
Fuck Snails said:
So I bought this vac pump ONLINE for $120

The listing said it was 3.0 CFM 2 stage.
I'm only pulling -23HG with it, and i think i might have got sent the wrong pump.
How much on average should a 3.0 CFM 2 stage pull? At least -30 right?

I've still got time to return the pump or replace it for the right one so I'd like to make sure I get what i paid for.
Click to expand...
Hook the hose from the pump directly to the gauge and see what it reads, to check out the pump itself. That of course requires a calibrated gauge.

Altitude affects how much absolute pressure there is to work with, so you might check out the attached chart.

If the pump and gauge are both good, then you have an air leak somewhere.
 

Attachments

Fuck Snails

Fuck Snails

Active Member
Chamber is one of those pre-assembled vac it pro setups you get off ebay. i got the 3 gallon one.
im up to -25hg but for a two stage 3.0cfm i should probably be gettin -30 right?
 
oilmkr420

oilmkr420

Active Member
Fadedawg said:
Hook the hose from the pump directly to the gauge and see what it reads, to check out the pump itself. That of course requires a calibrated gauge.

Altitude affects how much absolute pressure there is to work with, so you might check out the attached chart.

If the pump and gauge are both good, then you have an air leak somewhere.
Click to expand...
That's where hash oil excels again. For use to seal up any leaks, just dab some on the fitting connections where it's coming from and use teflon tape first and be neat w 2 winds.
 
chewberto

chewberto

Well-Known Member
Now I know what altitude you're at... Aaaaaannnd you're triangulated...

For every thousand feet in altitude above sea level you can subtract 1, I am assuming you're around 7000 feet give ot take?
 
Fadedawg

Fadedawg

Well-Known Member
Fuck Snails said:
Says max vac is 0.3pa or pascals.
Label reads...

2-Single Rotary Vane Pump
Click to expand...
Ummm, the question is not what the pump is rated for, it what it will actually pull. The test is to see if it will actually pull what it is rated for, or is defective out of the box.

I included a altitude graph. At your altitude, what is the absolute pressure from the graph.
 
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