making laminated glass tubes

wrote:
On Mar 24, 11:32 am, Bernhard Kuemel wrote:
I want to earn money, not pay. And the insurance probably would try not
to pay if they could blame me. Also I want to avoid accidents.

Sounds like you need to do some experiments. The pressure above liquid
CO2 at room temp is about 850 psi, so if you had a tank of air or
nitrogen at 2000 psi, you can pressurize the tubes until they explode,
or don't.

If they can take 2000 psi, good, but then you'll have to test for
shock resistance, if only to cause the glass to fracture. This will
test the ability of the PC shell to hold in the explosion.

Finally, you have to get some information from the PC maker on long
term performance of their products. Atlas Material Testing Co, of
Chicago, IL, may be able to point you in the right direction. That's
what they do for a living.

Dangerous Bill


When I was an Assistant Professor of Natural Science in the College of
the University of Chicago I was one of the lecturers in its physics
course in 1959. We had an apparatus for displaying the critical
properties of liquid CO2 to the students. It was the liquid in a glass
tube that in turn was mounted in wooden box (thick side walls) with
glass windows front and back. Underneath was both a heater and an air
cooling device. We shone a projector light on the tube and the image was
projected on a screen in the corner of the large lecture hall. If it
were to explode the glass fragments would not blow out toward the
students. The wooden walls were very thick. The apparatus had lasted for
decades and to my knowledge never caused a problem. But it showed
beautifully the disappearance and reappearance of the meniscus.
Impressive display! And safe.
FK

On Mar 31, 7:17*pm, Fred Kasner wrote:
... The wooden walls were very thick. The apparatus had lasted for
decades and to my knowledge never caused a problem. But it showed
beautifully the disappearance and reappearance of the meniscus.
Impressive display! And safe.

Presumably safe. We're talking in excess of 850 psi here. The
designers of the device may have tested it, or maybe not, or
calculated the strength of the enclosure, or not. Possibly it's only
decades of good luck.

Who can predict what will happen in the long term?

Years ago, there was an incident at a lab where I worked. Plutonium
239 had been sealed in glass vials, apparently for safety reasons. A
couple of decades later, the vials were retrieved from storage, and
the first one touched exploded in the face of the man handling it.
Alpha radiation had generated an unknown pressure of helium within the
vial to a point apparently just short of the breaking strength of the
glass. The area had to be enclosed and monitored before the rest of
the vials could be moved and 'disarmed'.

DB