Re: [time-nuts] Swagelok and metric tubing question

[Poul-Henning Kamp]

In message , Gary Woods writes:
>On Sat, 12 Nov 2016 13:05:56 -0800, you wrote:
>
>>Does it leak through cracks or migrate through metal?
>
>I was kinda wondering about that.  Isn't H the escape artist of the
>periodic table?

Indeed.

In particular it seeps through almost all metals.

(See also: https://en.wikipedia.org/wiki/Hydrogen_embrittlement)

The canonical filter method for hydrogen is to press it through a
"filter" which is a of solid slab of Palladium.

Helium is almost as bad, but is better in leak-checks because it
is non-reactive.

-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
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Never attribute to malice what can adequately be explained by incompetence.
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Re: [time-nuts] Swagelok and metric tubing question

[Howard Davidson]

Helium


On 11/12/2016 2:25 PM, Gary Woods wrote:

On Sat, 12 Nov 2016 13:05:56 -0800, you wrote:


Does it leak through cracks or migrate through metal?

I was kinda wondering about that.  Isn't H the escape artist of the
periodic table?




--
Howard L. Davidson
hl...@att.net

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Re: [time-nuts] Swagelok and metric tubing question

[Hal Murray]

garygar...@earthlink.net said:
> I was kinda wondering about that.  Isn't H the escape artist of the periodic
> table? 

I think that's helium.  They way they get it commercially is to start with 
gas wells that have lots of it.  I think some of them are 4%.  Then they just 
push it through quartz.  I think they use high pressure.  I'm not sure if 
quartz is special or just handy and works.

Hydrogen is weird in that it infiltrates lots of metallic crystals.
 

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Re: [time-nuts] Swagelok and metric tubing question

[Gary Woods]

On Sat, 12 Nov 2016 13:05:56 -0800, you wrote:

>Does it leak through cracks or migrate through metal?

I was kinda wondering about that.  Isn't H the escape artist of the
periodic table?


-- 
Gary Woods O- K2AHC   Public keys at home.earthlink.net/~garygarlic, or get 
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Re: [time-nuts] Swagelok and metric tubing question

[Hal Murray]

cdel...@juno.com said:
> I just went ahead and got the short section from McMaster Carr. Want to make
> sure it's right if I'm at 400+ PSI with Hydrogen for years at a time!!! 

How much hydrogen does a maser use?  How big is the tank?

Does it leak through cracks or migrate through metal?


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[time-nuts] Swagelok and metric tubing question

[cdelect]

Well it's been an education!
First finding out how to identify if the Swagelok fitting is Metric by
sight and now how carefully the tubing has to be made to use compression
fittings!
I just went ahead and got the short section from McMaster Carr.
Want to make sure it's right if I'm at 400+ PSI with Hydrogen for years
at a time!!!
Cheers,

Corby

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Re: [time-nuts] Swagelok and metric tubing question

[Chuck Harris]

Compression fittings work by crushing the surface
of the tubing, and the surface of the compression
insert together to make a gas tight seal.

Stainless is very tenacious stuff, and as a result,
when it is drawn through a die when sizing it as
tubing, it gets axial ridges formed by galling, and
damage to the dies.

If you are planning on welding the tubing, the ridges
won't matter, but if you are planning on using a
compression fitting, the ridges must be eliminated,
which is done by more expensive machining processes.

You can sometimes use tubing with ridges with
compression fittings if the fittings have a highly
compliant insert made of plastic, rubber, or copper.

Usually, though, when stainless is specified for the
tubing, you are going to want an all stainless solution
for the fittings too... which means ponying up for
the more expensive polished stainless steel tubing.

Don't even think of using compression fittings meant
for copper, or plastic tubing on stainless.  It won't
go well if you do.

-Chuck Harris


cdel...@juno.com wrote:
> Bob,
> 
> That's the cheapest I have been able to find it.
> 
> I'll probably go that route with the expensive version as it's specified
> for compression.
> 
> I know the original setup mixes copper and stainless but I have read that
> is not recommended???
> 
> Cheers,
> 
> Corby
> 
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Re: [time-nuts] Swagelok and metric tubing question

[Bob Camp]

Hi

The first thing that comes to mind with copper and stainless is that
they are not quite the same thing electrolytically (you make a battery). 
That can be ok, or pretty bad depending on how wet your environment is.

There may be other issues ….

Bob

> On Nov 11, 2016, at 8:57 PM, cdel...@juno.com wrote:
> 
> Bob,
> 
> That's the cheapest I have been able to find it.
> 
> I'll probably go that route with the expensive version as it's specified
> for compression.
> 
> I know the original setup mixes copper and stainless but I have read that
> is not recommended???
> 
> Cheers,
> 
> Corby
> 
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[time-nuts] Swagelok and metric tubing question

[cdelect]

Bob,

That's the cheapest I have been able to find it.

I'll probably go that route with the expensive version as it's specified
for compression.

I know the original setup mixes copper and stainless but I have read that
is not recommended???

Cheers,

Corby

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Re: [time-nuts] Swagelok and metric tubing question

[Bob Camp]

Hi

https://www.mcmaster.com/#9811T14

https://www.mcmaster.com/#50365K33

First one is a 2 mm wall at $75 a chunk. Second one is 1.5 mm at $33 a chunk. 
It’s not
obvious why one is “compression fitting” and the other is “weld” rated. In any 
case, I suspect
you need the 2X more expensive, done just for compression fitting versionl. If 
anybody
is looking in their junk box, time to take your calipers out and check if that 
wall thickness 
is 2.0 mm or 1.5 mm (I guess …). 

Bob




> On Nov 11, 2016, at 12:51 PM, cdel...@juno.com wrote:
> 
> This sound off topic but it's for a Hydrogen Maser modification!
> The EFOS2 Maser is running low on Hydrogen and this time rather than
> refill the compressed gas bottle I'd like to install a Hydrostik in its
> place.
> I have obtained all the fittings I need but have hit a snag!
> I need a few short pieces of 10mm OD 1 or 2mm  wall stainless tubing to
> go into the Metric Swagelok fitting.
> However all I can find on the net would cost me over $100.00!
> Does anybody have a few short lengths (two 3" and two 4" if cut ready to
> insert in the fitting) or one 18" piece that I could buy at a reasonable
> price???
> 
> Thanks,
> 
> Corby
> 
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Re: [time-nuts] Swagelok and metric tubing question

[Scott McGrath]

Hi Corby

Is there a requirement for a specific alloy?   I might have some odds and ends 
lying around 

Content by Scott
Typos by Siri

> On Nov 11, 2016, at 12:51 PM,   wrote:
> 
> This sound off topic but it's for a Hydrogen Maser modification!
> The EFOS2 Maser is running low on Hydrogen and this time rather than
> refill the compressed gas bottle I'd like to install a Hydrostik in its
> place.
> I have obtained all the fittings I need but have hit a snag!
> I need a few short pieces of 10mm OD 1 or 2mm  wall stainless tubing to
> go into the Metric Swagelok fitting.
> However all I can find on the net would cost me over $100.00!
> Does anybody have a few short lengths (two 3" and two 4" if cut ready to
> insert in the fitting) or one 18" piece that I could buy at a reasonable
> price???
> 
> Thanks,
> 
> Corby
> 
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[time-nuts] Swagelok and metric tubing question

[cdelect]

This sound off topic but it's for a Hydrogen Maser modification!
The EFOS2 Maser is running low on Hydrogen and this time rather than
refill the compressed gas bottle I'd like to install a Hydrostik in its
place.
I have obtained all the fittings I need but have hit a snag!
I need a few short pieces of 10mm OD 1 or 2mm  wall stainless tubing to
go into the Metric Swagelok fitting.
However all I can find on the net would cost me over $100.00!
Does anybody have a few short lengths (two 3" and two 4" if cut ready to
insert in the fitting) or one 18" piece that I could buy at a reasonable
price???

Thanks,

Corby

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