chucknorris
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Too powerful vacuum pump..
I bought a vacuum pump that is a little too harsh for me. Even liquids with BP at 200C will boil at room temp, so I need to decrease the power a
little so that those could be handled without dealing with special coolrants. Should I just leave the tubings a little loose for intentional leaks or
are there other methods?
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kavu
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An easy way to achieve pressure control is to hook up the vacuum line with a three-way adapter to a valve. The more you open the valve, the higher the
pressure. Using a simple straight glass stopcock has worked rather well for me.
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chemrox
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please see https://www.sciencemadness.org/whisper/viewthread.php?tid=21...
where the various methods of controlling vacuum are discussed. Please also read up on how to build a vacuum line. A lot needs to be done to protect
the pump, read and maintain the vacuum. There's some material in Vogel's 3rd and a couple of books by Gary S Coyne.
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
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zed
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Too powerful a vacuum? You should dispose of such a pump immediately. Very dangerous.
Just leave it out next to your garbage cans, and as a friend, I'll come over and haul it away. For you, I charge nothing.
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chemrox
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Quote: Originally posted by zed  | Too powerful a vacuum? You should dispose of such a pump immediately. Very dangerous.
Just leave it out next to your garbage cans, and as a friend, I'll come over and haul it away. For you, I charge nothing. |
This was my alternate reply hehehehe
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
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m1tanker78
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Harbor Freight??
Tank
Chemical CURIOSITY KILLED THE CATalyst.
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chucknorris
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Nope, from the internets.  Just cant hold the liquids between 100-300c Im
intending to boil and Im not gonna use highly expensive dry ice, although even it wont help when distilling substances at the lower 100C's scale.
I will give a try for that injection needle leak. I just need to regulate the pressure up to the millibar scale(5mbar is more than enough for just
about all applications I do, and my pump goes to 50 microbars). An insulin needle should do the trick. 
[Edited on 8-12-2012 by chucknorris]
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sargent1015
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Wait... What? Expensive???? It's like $1/pound!
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chucknorris
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In my country it costs 15 euros per kg + delivery costs which force you to order at least some 30kg to make the price even remotedly bearable.
[Edited on 8-12-2012 by chucknorris]
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Lambda-Eyde
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Yeah, and a sixpack of beer is 5$!
(do you see how ridiculous my statement is?)
This just in: 95,5 % of the world population lives outside the USA
Please drop by our IRC channel: #sciencemadness @ irc.efnet.org
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sargent1015
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| Quote: Originally posted by chucknorris | In my country it costs 15 euros per kg + delivery costs which force you to order at least some 30kg to make the price even remotedly bearable.
[Edited on 8-12-2012 by chucknorris] |
Well I can walk down to the grocery store and pick it up for that cheap...
As for a 6-pack, well that's only $7
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nachra
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Miller highlife is only 5$ if u consider that booze
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hyfalcon
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Budweiser is $14.00 an 18 pack here. Dry ice is $1.65/lb.
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Darkblade48
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And here I am paying $30.50 for an 18 pack of Budweiser....
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sargent1015
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Why do you guys drink that stuff??
Anyways, back on topic, dry ice can be had at reasonable prices!!
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Lambda-Eyde
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It should be said that both Budweiser and Miller are undrinkable and a fucking disgrace to anything called beer, but that's not really my point. My
point is that I pay ~25$ for a sixpack of mediocre lager beer here in Norway, the difference between the two of us is that I am the only one who seem
to understand that this is no universal truth.
For half a liter of strong craft beer, I pay ~10$ and once I paid ~60$ for a bottle of Black Tokyo* Horizon at a pub in Oslo, which was well worth it.
And if I want dry ice, it's on the order of ~15$/kg, 8 kg minimum order, and a few days order time.
This just in: 95,5 % of the world population lives outside the USA
Please drop by our IRC channel: #sciencemadness @ irc.efnet.org
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