I second the point from Gary. The wisdom I’ve received from multiple
magnet engineers is that steel reinforced nitrogen transfer lines are more
trouble than they’re worth: low risk of serious consequences.
We use natural latex rubber or Teflon tubing for all of our nitrogen transfers,
both for supply and exhaust. Yes, they wear out, but they’re inexpensive
to replace and provide a comparatively safe point of failure: moderate risk
of low consequences.
Regards,
Alex
Alexander Paterson, PhD
The National Magnetic Resonance Facility at Madison (NMRFAM)
University of Wisconsin-Madison
> From: main_at_ammrl.groups.io On Behalf Of Gary Thompson via groups.io
> Sent: Tuesday, September 3, 2024 13:38
> To: main_at_ammrl.groups.io
> Cc: Gary Thompson <G.S.Thompson_at_kent.ac.uk>
> Subject: Re: [AMMRL] Tubing for N2 fill exhaust?
One interesting comment is that Bruker (uk?), certainly at least in conversation
with me, _don’t_ recommend steel reinforced tubes as it’s much
easier to over pressure your magnet and damage it with them. So they actually
recommend a rubber or silicone tube as it will break before you damage your
magnet due to overpressure.
regards
Gary
Dr Gary S Thompson NMR Facility Manager
CCPN CoI & Working Group Member
Wellcome Trust Biomolecular NMR Facility
School of Biosciences, Division of Natural Sciences
University of Kent, Canterbury, Kent, England, CT2 7NZ
☎:01227 82 7117
✉️: g.s.thompson_at_kent.ac.uk<mailto:g.s.thompson_at_kent.ac.uk>
orchid: orcid.org/0000-0001-9399-7636
On 3 Sep 2024, at 18:05, Jeff Walton via groups.io wrote:
We have done the same on the fill side so we can use steel braided LN2 hose
from the dewar to the magnet. We are going to do the same on the exhaust
as we’ve had a few latex hoses shatter recently. You really shouldn’t
be using rubber with LN2.
Jeff
On Aug 29, 2024, at 1:46 PM, Ian Vorster via groups.io wrote:
We designed a sturdy liquid nitrogen hose connected to a U-shaped stainless
steel component, featuring an adjustable tightening mechanism at the end.
This setup is both effective and foolproof, making it a worthwhile investment
for enhancing safety with a robust system.
http://nmr.vuw.ac.nz
School of Chemical and Physical Sciences
Victoria University of Wellington
New Zealand
________________________________
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#1588): https://urldefense.com/v3/__https://ammrl.groups=
.io/g/main/message/1588__;!!PvDODwlR4mBZyAb0!VEfkELwRGZ5gcn6h0R61JT7zrIaAMF=
QTz6dZwgc0TrQ3EG3LNXXzMFPq2ZBfeFywu8oOqurvDvQQzxioV7XUIHVt2kWc$
Mute This Topic: https://urldefense.com/v3/__https://groups.io/mt/108103713=
/7559972__;!!PvDODwlR4mBZyAb0!VEfkELwRGZ5gcn6h0R61JT7zrIaAMFQTz6dZwgc0TrQ3E=
G3LNXXzMFPq2ZBfeFywu8oOqurvDvQQzxioV7XUIJHEeVrM$
Group Owner: main+owner_at_ammrl.groups.io
-=-=-=-=-=-=-=-=-=-=-=-
Received on Tue Sep 03 2024 - 11:44:25 MST