Cryogenics

[crozzy]

I am going to Europe in a week to study Cryogenic Physics. Does any one here work on that type of equipment? The professor in scottland told me, very few people work on this equiment. It's mostly goverment officals. I was just wondering of peoples expeciances before I head out there. From what Ive been studying it's liquefied gases with temps ranging from -238F to absolute zero. Do any of you have any experiance with that?
Thanks

[rimek]

Most of mine are liquid nitrogen tanks for tissue storage, which run at -150°C to -190°C(-238° to -310°F) depending on depth of liquid. I have no sealed, recirculating systems, only expendables. The tanks(dewars) are double wall stainless(thermos style) and are set up as atmospheric, the liquid evaporates until vapor is 100% nitrogen and level of liquid is maintained by manual fill or automatic fill through controls and solenoid valve. These solenoids valves are special application for the fluid temps. Is this the type of equipment you're working on? Biggest hassle is when moisture gets into a less active dewar, and freezes specimens to floor in 1-2" of water ice at -190°C. Then the user wants to get all their stuff out without thawing. The level sensors, valves, controls, and temp sensors usually aren't that hard to replace.
Here is a page/pdf with some Nitrogen safety and physical information:
http://www.airproducts.com/NR/rdonlyres/sfgrm072ab4caielohouqxymzia.pdf

[crozzy]

That was very helpful, thank you. I'm just starting out in it. My company is sending two of to that class to learn more about it. I guess the boss is starting to get more indepth with Cyyogenics and liquid Nitro. So it should be interesting. I thank you for that Info. I will pass it to some of our guys also.