[labnetwork] Cryo-piping contractors for LN2 piping sought

[Timothy Fuller]

When I worked at HRL our original installation had KF 25 Buna-N o-rings for
the vacuum jacket.  After replacing them with Viton o-rings, the vacuum
jacket was leak tight.

On Wed, Mar 1, 2023 at 4:45 AM johnboyle <johnboyle at fast.net> wrote:

> Check Acme Cryogenics, Allentown, PA. They make VIP, phase separators, do
> installation and repairs. Ask for Field Services
>
> John Boyle
>
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
>
>
> -------- Original message --------
> From: "Collins, Deon" <deonc69 at illinois.edu>
> Date: 2/28/23 7:46 PM (GMT-05:00)
> To: "Metzler, Meredith G. (Fed)" <meredith.metzler at nist.gov>,
> labnetwork at mtl.mit.edu
> Subject: Re: [labnetwork] Cryo-piping contractors for LN2 piping sought
>
> Your vacuum jacket has failed. We are going through the same situation
> with our static LN2 delivery lines.
>
>
>
> Is your phase separator a Static or Dynamic system?
>
>
>
> *From:* labnetwork <labnetwork-bounces at mtl.mit.edu> * On Behalf Of *Metzler,
> Meredith G. (Fed)
> *Sent:* Tuesday, February 28, 2023 2:08 PM
> *To:* labnetwork at mtl.mit.edu
> *Subject:* [labnetwork] Cryo-piping contractors for LN2 piping sought
>
>
>
> We are hoping the community can assist us in identifying a vendor who can
> inspect an existing LN2 delivery piping system in the cleanroom for our
> cryo-etch tools. We've recently started experiencing issues with a phase
> separator that keeps building up a large block of ice on the outside of it.
>
>
>
> We have a 5 Gallon phase separator made by Chart Inc. with one outlet. It
> feeds liquid nitrogen to several tools in the etch bay of the cleanroom.
> The LN2 system is house regulated to 40 PSI at the inlet. The unit
> separates the gaseous N2 from the liquid. The liquid is stored in the 5
> gallon volume surrounded by a vacuum jacket to prevent icing. The final LN2
> inlet connection to the phase separator, the exhaust connection, and the
> over pressure relief connection seem to be the biggest points of failure.
> At these three points we have cold air and moisture condensation that forms
> an ice ball.
>
>
>
> Although, we have made many at wrapping and insulating these connection
> points, we cannot quite get the coverage to eliminate this ice ball.
>
>
>
> Does the community have any preferred cryo-piping contractors they can
> recommend to assist with solving this issue and any of our future
> cryo-piping needs?
>
>
>
> Thanks!
>
>
>
> Meredith Metzler
>
> National Institute of Standards and Technology, Physical Measurement
> Laboratory
>
> Process Engineer – Center for Nanoscale Science and Technology Facility,
> NanoFab
>
> 100 Bureau Drive, Mail Stop 6201, Building 216
>
> Gaithersburg, MD 20899
>
> 301-975-8187
>
> meredith.metzler at nist.gov
>
> https://www.nist.gov/cnst
> <https://urldefense.com/v3/__https:/www.nist.gov/cnst__;!!DZ3fjg!-6Lfwk5cCgFK0WcjbkRqEZm2A8T7loqa2OV_9x-WW72ajmC1A4euSzW2VyRMpj0J8yR1_DdWvG0axt3nRQj-R1EmQJ2lypVZ$>
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>
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