g it full of helium and sniffing for it
> with a sensor :-)
… whereas we did the opposite: searching for inward leaks through
joint seals, we used the spray test, squirting a tiny jet of He
at suspect points and detecting any He being pumped out. As expected,
we never saw He entering throug
rd is seal, not the thickness of the monel walls.
Seal—and no cracks.
You still don't get it, the helium molecule is so small it wiggles
thru a steel walls huge molecules
like they were a layer of felt. Monel alloy is denser but it still leaks.
I haven't done the experiments, but others,
Hi,
i looked up some data points about helium.
This table gives floating times for helium balloons and the pressure in
usual helium cylinders (200 bar).
https://de.wikipedia.org/wiki/Luftballon#Ma%C3%9Fe
The numbers of fillings per ballon diameter in the "10 liter" column
indicat
On Thu, Nov 03, 2022 at 03:34:54PM +, mick.crane wrote:
[...]
> I know next to nothing about this stuff but it helps me to think that rather
> than everything made of little things that it's clouds of god knows what
> swirling about.
Yes, the depth of the "technological stack" is sometimes s
.
I understood that. My point was that a helium filled HD most probably
hasn't that pressure, so the leak rate is bound to be lower. Besides,
if it's just He one can't make tight containers for, it'd be that
leaking out, but air staying out, so...
> Yes, I've read a
On 2022-11-03 14:38, David Wright wrote:
You still don't get it, the helium molecule is so small it wiggles
thru a steel walls huge molecules
like they were a layer of felt. Monel alloy is denser but it still
leaks.
I haven't done the experiments, but others, like this pair, ha
On Wed 02 Nov 2022 at 06:44:22 (+0100), to...@tuxteam.de wrote:
> On Wed, Nov 02, 2022 at 12:06:16AM -0500, David Wright wrote:
> > On Tue 01 Nov 2022 at 06:49:09 (+0100), to...@tuxteam.de wrote:
>
> [...]
>
> > > This is only a half-truth. You know what goes out faste
On 11/2/22 01:07, David Wright wrote:
On Tue 01 Nov 2022 at 06:49:09 (+0100), to...@tuxteam.de wrote:
On Mon, Oct 31, 2022 at 06:32:17PM -0400, gene heskett wrote:
[...]
I think, but don't know for sure, that they were also helium filled drives,
a guaranteed disaster.
They used the h
On 2022-11-02, David Wright wrote:
>
> To be fair, most vacuum tubes aren't bathed in helium, but air, and
> then only at a one atmosphere differential pressure. A gas cylinder
> might be as high as 500 atmospheres.
I always thought vacuum tubes weren't filled with anyth
On Wed, 2 Nov 2022, David Wright wrote:
Whatever, even I with an 8th grade diploma, knows you cannot keep helium
anyplace for very long. Put it in a monel metal
bottle with walls an inch thick and its molecules's are so small that 10% of
it is gone in 6 or 7 hours.?
So the He cylinders
On Wed, Nov 02, 2022 at 12:06:16AM -0500, David Wright wrote:
> On Tue 01 Nov 2022 at 06:49:09 (+0100), to...@tuxteam.de wrote:
[...]
> > This is only a half-truth. You know what goes out faster than helium?
> > Vacuum. And there was a whole glorious epoch in electronics which
On Tue 01 Nov 2022 at 06:49:09 (+0100), to...@tuxteam.de wrote:
> On Mon, Oct 31, 2022 at 06:32:17PM -0400, gene heskett wrote:
>
> [...]
>
> > I think, but don't know for sure, that they were also helium filled drives,
> > a guaranteed disaster.
> >
> &g
On Mon, Oct 31, 2022 at 06:32:17PM -0400, gene heskett wrote:
I think, but don't know for sure, that they were also helium filled
drives, a guaranteed disaster.
https://www.mail-archive.com/debian-user@lists.debian.org/msg780296.html
gene heskett Sun, 13 Mar 2022 14:49:25 -0700
The fir
On 11/1/22 01:50, to...@tuxteam.de wrote:
On Mon, Oct 31, 2022 at 06:32:17PM -0400, gene heskett wrote:
[...]
I think, but don't know for sure, that they were also helium filled drives,
a guaranteed disaster.
They used the helium to make the heads fly lower, and when the helium leake
On Mon, Oct 31, 2022 at 06:32:17PM -0400, gene heskett wrote:
[...]
> I think, but don't know for sure, that they were also helium filled drives,
> a guaranteed disaster.
>
> They used the helium to make the heads fly lower, and when the helium leaked
> out, and air leaked i
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