Good morning All
I use silicone tubing (16 mm OD x 10 mm ID). It is relatively inexpensive
and comes in 15 metre lengths from a general laboratory supply company.
The silicone tubing is threaded through a sleeve of foam rubber
(approximately 40 mm OD x 20 mm ID), also relatively inexpensive, available
on a per-metre basis from a general household plumbing supplier. The foam
rubber sleeve is effective in restraining the debris from a shattered
silicone hose.
Regards,
Craig.
On Wed, 4 Sept 2024 at 04:33, Shin, Ronald via groups.io <shinr=
uab.edu_at_groups.io> wrote:
> I’ve used both natural rubber tubing as well as a braided stainless steel
> transfer line for liquid nitrogen fills, in addition to a high density
> polyethylene transfer line that Bruker supplied us with our Ascend 850
> magnet.
>
> I’ve been using the same 6’ long latex hose for 12+ years for our lower
> field magnets. Each time I do the fills, I always check the hose to make
> sure that there aren’t any signs of cracking, etc. Once in a while, I’ll
> spray down the exterior of the hose with some Armor-All. I figure it can’t
> hurt…
>
> I’ve also been using the same 12” lengths of natural rubber tubing on the
> outlet ports of the magnets for 12+ years now.
>
> I bleed off the gas pressure in the liquid nitrogen dewars until they drop
> down to 5 psi, and then do the fills.
>
> Besides, there’s a warning sticker on just about every Bruker magnet I’ve
> seen that specifically states that you don’t want to exceed 5 psi / 0.35
> bar of pressure while doing a liquid nitrogen fill, and while it may be
> overkill, it’s better to be safe than sorry.
>
> It’s inevitable that natural rubber tubing will fail eventually, but I’d
> have to guess that keeping the fill pressures low should greatly increase
> the lifespan of natural rubber tubing.
>
> Ronald Shin
>
> University of Alabama at Birmingham
> Central Alabama High Field NMR Facility
>
>
>
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Received on Wed Sep 04 2024 - 01:57:53 MST