[3dem] pumping down liquid nitrogen dewars (Andrzej ?ak)

[Kikuti Carlos]

Morgen !

I’m always scared by old containers under pressure… even when they are not under pressure, if you are the one paying for N2 you might consider replacing it entirely. From the top of my head, the price for a 60 L pressurized N2 container was around 1.5 k€ or less (I might be mixing up things from several years ago, so don’t take it as an official quote). We have good contact with Air Liquide, which are the biggest, if not the only provider of N2, O2, CO2, Ar in France. They sent someone to see our needs and give advice for free. They also sell some connectors and accessories. I don’t know if they work in Germany, though, but I believe/hope it is possible to find the same kind of service.

---------------------------------------------------
Carlos KIKUTI, PhD
UMR144 - CNRS - Institut Curie
Pavillon Trouillet Rossignol
26 Rue d’Ulm - 75005 Paris, France
carlos.kikuti at curie.fr<mailto:carlos.kikuti at curie.fr>




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Message: 1
Date: Thu, 22 Feb 2024 17:48:55 +0100
From: Andrzej ?ak <andrzej.zak at pwr.edu.pl>
To: Tobias Furstenhaupt <furstenh at mpi-cbg.de>
Cc: 3dem at ncmir.ucsd.edu
Subject: Re: [3dem] pumping down liquid nitrogen dewars
Message-ID:
        <CAJqBd=eX49it=XJ6z+ooOqcbUEkyfdgarqRZaPq_bzY4fwm9MA at mail.gmail.com>
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Hi Tobias,
There is bunch of different systems of such valves, they a bit differ in
sizes. The best way is to go to vacuum dewar company or local researchers
working in cryogenics or vacuum. The process of regeneration is not obvious
and take some time. I Poland in some of the Polish Academy of Science
institution I paid around 300-400euros for whole procedure for 80l tank,
including first filling and usage test.
Best wishes
Andrzej

Andrzej ?ak
Wroclaw University of Science and Technology,
tel. (+48)883314999

czw., 22 lut 2024, 15:58 u?ytkownik Tobias Furstenhaupt <furstenh at mpi-cbg.de>
napisa?:

> Dear colleagues,
>
> we have about 8 dewars to store our cryo samples. Some are rather old (10+
> years) and insulate badly (=large consumption of nitrogen).
> Each of the dewar has something that looks like a valve (see attached
> foto) to pump the vacuum between the two walls.
> Does anybody of you know the name of the corresponding connector and where
> to buy it (europe/US)?
>
> cheers
> Tobias
>
>
> -----------------------------------
> Tobias F?rstenhaupt, PhD
> head of Electron Microscopy
> Max Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG)
> Pfotenhauerstrasse 108
> 01307 Dresden, Germany
>
> mail: furstenh at mpi-cbg.de
> phone: (+49) (0)351 210-2690
> cell: (+49) (0)176 / 44498706 (NEW!)
> _______________________________________________
> 3dem mailing list
> 3dem at ncmir.ucsd.edu
> https://mail.ncmir.ucsd.edu/mailman/listinfo/3dem
>

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