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Greetings I have been a some time lurker for the simple fact of having not to much to add but today hopefully that could be different. As an employed welder I would suggest doing something in the

I note for ultrahigh vacuum copper seals are used. Just a thought. Also, you cannot mean 18 Torr. I presume you mean something like 10e-3 Torr, which is characteristic for a common roughing pump. I

Greetings All, Just thought I'd share the initial results on my latest project, a 24" mirror coater :) Today I fabricated the Square O-Rings from stock 10mm O-Ring cord, and ran the first leak test

Mine didn't explode but the fried oil makes a big mess. -- I don't think it could explode!! The oil vapor normally expelled from pumping could be a hazard in a closed off room with no ventilation. Ron

Yes, its high cost probably makes it impractical for use (or Fomblin, etc) by most amateurs (including me!) but I was very fortunate to be given about 500cc's of it by a good friend.

Since we don't know what makes up the non-Teflon part of the paste, I would use the tape, _if_ that's the only choice. I have read that teflon is fairly porous and not recommended for high vacuum work

This pricy fluid should be quite safe from my reading. Dominic

Guys, A question on how to seal NPT-type joints which will see vacuum service (such as thermocouple gauge heads etc). Do you favor using teflon tape, or some of the teflon paste? Thanks. -Bill

On Friday, December 19, 2003, at 08:02 AM, arcstarter wrote: > Guys, > I own some 'random' diffusion pump - and as such I don't know the > proper oil charge. Inlet diameter is 3 inches, water cooled.

My diff. pump uses a sili

Guys, I own some 'random' diffusion pump - and as such I don't know the proper oil charge. Inlet diameter is 3 inches, water cooled. My question is - what will happen if the diffusion pump contains

Not at all; you hit it right on the mark! Some of us are essentially amateurs building our own systems and this usually means looking for lower price solutions. I would expect such people to read

and I was lucky, no pumped the like burnt oil. especially diff pump e

I don't think you were exceptionally lucky. I think explosions are exceptional. Filthy messes and burnt oil all over the place I have seen and smelled first hand. This was warning enough for me,

Greetings all, I was recently working on my Ion vacuum gauge which entailed evacuating and venting the chamber several times in a row. After about the 3rd evacuation, I was getting a little too hasty

Varian states this explicitly in their general info about diffusion pumps. I'd have to hunt for the web page, but I found it in a general search for info about ultra-high vacuum. Let me know if you

I've read and heard much about damaging the oil itself (oxidation) due to exposing it at elevated temp to air, but I've never heard of one exploding, although I'm not saying it couldn't happen. Do you

My only caution is to be aware that diffusion pumps operate by heating oil in a vacuum. If suddenly exposed to air, many of these oils hit the spontaneous ignition point and explode. Some degree of

I'm trying to build some vacuum stuff for physics demonstrations at our little college, and for my own amusement/research. We have a collection of superannuated mechanical pumps that have been donated

I seem to recall reading that Viton was the ultimate, and not too expensive from places like Rocket Seals et al.