Some added information, the Liquid Helium Supplier does not supply fittings for the Dewar, we must provide our own as they do not even know where to get them. Below is a summary of response, multiple responses of the same answer are only listed once. Thank you all for your help, I believe that they were able to find some fittings, but I have not talked to them again yet.
-You might want to check with MR Resources. Years ago, I was able to get a set of fittings (3 or 4 pieces) from them. The largest adapter fits the 250L Helium Dewar.
-Normally the company that delivers the Helium will add these fittings and extra O-rings on the tank.
Some companies don't do it, but they may be able to provide them when asked.
Before ordering from other places, check this. Also, if it is a new instrument, your NMR salesperson can give these for free.
-In the past you could get them from Prax Air. I do not know if that is still true.
-They can get them from REGO Cryo-flow. Here's a link to the relevant catalog page:
http://www.regocryoflow.com/PDFs/Quikonnect_Couplings.pdf
- We use Praxair as our Liq. He supplier. In the past I have just asked them directly for the appropriate adapters. They had no problem supplying them to us.
- I'm not sure who the supplier would be but I would check with your local helium supplier. My supplier refers to the fitting as a Goddard fitting.
- Try Cryofab (www.cryofab.com<
http://www.cryofab.com>), they probably sell them or know where to get them.
-I just bought the coupling stack from:
"Cryofab, Inc.
Kenilworth, NJ.
Phone: 908-686-3636"
Part NO: STACOU
Description: Stack, coupling
Price: $69.85
This one has 4 level. I would also recommend to order back-up O-rings
- you probably got some replies already, but just in case no one mentioned:
I got my helium fill connectors/fittings at Grainger and McMaster.
Once again, thank you all for your assistance, it was very useful to me and hopefully the other users.
Margaret Smallbrock
Margaret Smallbrock
Chemical and Instrumentation Specialist
Department of Chemistry
SD School of Mines
501 East St. Joseph Street
Rapid City, SD 57701
(605) 394 - 1236 - Phone
(605) 394 - 1232 - Fax
Received on Wed Oct 05 2011 - 09:18:20 MST