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From: jonnie on 18 Dec 2009 12:08

"Bernhard Kuemel" <bernhard(a)bksys.at> wrote in message
news:1043f$4b2ba8f8$557f66e5$31551(a)news.inode.at...
> jonnie wrote:
>> "Bernhard Kuemel" <bernhard(a)bksys.at> wrote in message
>> news:47006$4b2b8cfc$557f66e5$13738(a)news.inode.at...
>>> Hi!
>>>
>>> I make display glass tubes with high pressure content (up to 200 bar).
>>> To protect the tubes from damage and to protect the spectators from
>>> shrapnel in case of an explosion I try to make a protective cover.
>>>
>>
>> Try waterglass mixed with a sealer
>
> You mean fill the gap with water glass and seal the end with e.g.
> silicone?

wont work for that pressure and time. Why 100 years? all tubs burn in two or
three years.

>
>> Else use fiberglass threads - used on High pressure Nitrogen tanks
>
> The inner pressure tube must remain visible. Look here: This is a
> pressure tube with a polycarbonate protective tube:
>
> http://darsie.dyndns.org/bernhard/ebay/co2/dsc_0368.jpg
>
> This is a 60 mm OD, 7 mm wall protective glass tube breaking at a test
> explosion:
>
> http://darsie.dyndns.org/bernhard/CO2/co2.mp2.mp3lame.mpg (4.4 MB)
> http://darsie.dyndns.org/bernhard/CO2/co2.avi (3.4 MB, same video,
> higher compression)
>
> Bernhard


From: dlzc on 18 Dec 2009 12:10
On Dec 18, 9:23 am, Uncle Al <Uncle...(a)hate.spam.net> wrote:
> Bernhard Kuemel wrote:
>
> > I make display glass tubes with high pressure content
> > (up to 200 bar). To protect the tubes from damage and
> > to protect the spectators from shrapnel in case of an
> > explosion I try to make a protective cover.

> You've got safety and aging issues.  The usual approach
> is a ruggedized tube inside an adequately thick,
> replaceable polycarbonate shield assembly.

I'd recommend this ruggedized tube operating in a "bathtub" full of
water. Use cameras and/or portholes to provide the visible stuff.
Drain and fill when you are going to pressurize.

Worst case, you pull a Gallagher or Shamu. At 200 bar, it is not
"shrapnel", it is glass bullets.

David A. Smith
From: Mark Thorson on 18 Dec 2009 16:11
Bernhard Kuemel wrote:
>
> I thought of using laminated glass panes, which are easier to make. But
> a tube looks much better than a cuboid. Also how do I join the panes so
> they will not open at the edges when the pressure tube explodes.

What about a box that is metal on all sides
but one, the latter being the laminated plate
glass?

Or maybe metal on all sides with a video
camera and lamp inside with the tube.
From: Uncle Al on 19 Dec 2009 11:09
Mark Thorson wrote:
>
> Bernhard Kuemel wrote:
> >
> > I thought of using laminated glass panes, which are easier to make. But
> > a tube looks much better than a cuboid. Also how do I join the panes so
> > they will not open at the edges when the pressure tube explodes.
>
> What about a box that is metal on all sides
> but one, the latter being the laminated plate
> glass?
>
> Or maybe metal on all sides with a video
> camera and lamp inside with the tube.

The cute part is seeing critical point opalescence for CO2, N2O, SF6,
CF3Br, propane, CCl2F2, CH2F2, ethylene, C2F6, etc. Gotta have a
through-sight path.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz4.htm
From: Lauri Levanto on 19 Dec 2009 12:17
Uncle Al wrote:
>
> The cute part is seeing critical point opalescence for CO2, N2O, SF6,
> CF3Br, propane, CCl2F2, CH2F2, ethylene, C2F6, etc. Gotta have a
> through-sight path.
>

What aren the hazards?
Glass shards of explosion,
Expanding gas volume?
some materials are volatile?

You apparently want to warm up and cool in mionutes.
That is lot of stress on any glass.

Shards can be conteiined between laminated windows
Escapinh gas needs a safe path out
Fire hazard must be in control.

For heating and cooling it is better to have the protective
windows at some distance so they do not increase the thermal mass.

observer || U || light source
where || are flat laminated windows, U is the test vial.
-lauri
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