dear dr moyna
on our tanks it is a standard 1/2 inch npt (national pipe thread
tapered) pipe thread available at hardware stores. i connect it to a
union and a 4way fitting with a guage reading accurately in the 0-3 psi
range and several ball valves one to vent and another for the helium
pressurizing gas. i can then check the pressure in the dewar and monitor
pressure during filling without relying on the tank guages which are
usually broken.
yours
charles amass
smith college
Guillermo Moyna wrote:
>
> Hey gang,
>
> While doing a He fill a couple of days ago we came across the same problem we have every time we do it. I cannot seem to find the right coupling for the gas inlet (to pressurize the liquid He tank). It is larger than the nitrogen tank inlet/outlets, but could not find anything around that would fit (as always, I ended up puting a piece of latex tube around the threads...).
>
> Now the tank is gone, and I cannot measure the fitting. Does any one know the size and TPI (threads per inch) of those couplings? I supose it is something I can get at Home Depot and that I will not have to go back to my days fabricating couplings on the lathe...
>
> Guillermo
>
> +==================-------------- --- -- - - - -
> Guillermo Moyna, PhD
> Assistant Professor of Chemistry
> Department of Chemistry & Biochemistry
> University of the Sciences in Philadelphia
> 600 South 43rd Street
> Philadelphia, PA 19104-4495
>
> "The only existing things are atoms and empty space.
> All else is mere opinion" - Democritus, 370 B.C.
>
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> Phone: (215) 596-8526
> Fax: (215) 596-8543
> e-mail: g.moyna_at_usip.edu
> WWW: http://tonga.usip.edu/gmoyna/index.html
> http://www.usip.edu/chemistry/faculty/moyna.asp
>
> - - - - -- --- -----------=================+
Received on Fri Aug 15 2003 - 08:13:07 MST