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Posted by Androcles on December 18, 2009, 12:49 pm
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> Androcles wrote:
>>> 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.
>
>> Why not make samples and test them by breaking them at 200 bar
>> and seeing what the result is?
>
> I do make explosion tests with display tubes filled to higher than
> normal pressure. But acquiring the materials costs money and making the
> pressure and protective tubes is a lot of work so I try to pick the
> ideal materials at first.
>
>> Any restriction on thickness (bullet -proof glass)?
>
> Not unless they remain practical. I'm currently thinking of 60 mm total
> outer diameter with 7 mm wall thickness for the outer tube, 1-3 mm gap
> material and 2 mm inner tube of the protective tube. That's 10-12 mm
> total wall thickness of the protective tube. Length is 20-25 cm.
>
> The pressure tube within the protective tube is 10 mm OD.
>
> But I could not find bullet proof glass *tubes*. I did find laminated
> glass tubes intended as pillars in building construction. However, they
> cost near 100 Euro per 25cm piece.
>
> 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.
>
>> Any restriction on wire?
>> http://www.fireglass.com/glass/wirelite-nt/
>
> The purpose is to watch the pressure tube in detail. So I will try
> without wires.
>
> Bernhard
If you use a thick-wall tube of toughened glass then why would
you need a protective tube at all? Seems to me you are making
hard work for yourself taking a precaution that is excessive, but
then I don't know what your costs are. Have you approached
any glass manufacturers and obtained quotes?
http://tinyurl.com/y9442wu
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