Hydrostatic
testing of a glass component has limited utility because
glass is a brittle material and will fail, not deform.
Worse, Glass can break rather suddenly without any
motivating cause as residual stresses vary from heating or
time. Unless the vendor specifically rates them for more
than 3-5 psig I would never suggest pressuring any glass
container regardless of how you tested it. I have seen glass
containers pass a hydrotest and fail the next week at much
lower pressures.
I talk about
this more in my article:
Glass and
Pressure, https://www.linkedin.com/pulse/glass-pressure-richard-palluzi/
It is hard to comment
with specifics because of the big unknowns in the
description "gas demonstrations." Firstly, the integrity
of the new glass vessels could be affected by the etching.
The real pressure it can handle will depend on the
temperature of the demonstration and wall thickness.
Larger vessels tend to have lower ratings unless the
thickness is substantially increased. If the demonstrator
is worried about pressure, then I suggest three things (1)
hydrostatic testing before use (2) don't use it over 25
psi max. and (3) add a sized pressure relief device to
prevent over-pressurization.
Chemical
Engineering Safety Coordinator
Ralph E.
Martin, Department of Chemical Engineering
One of our faculty member was doing due
diligence inspections on inherited equipment he uses in
the physical chemistry lab for gas demonstrations. He
found some defects in glass 5 gallon carboys, so ordered
replacements. They arrived from DWK-Kimble with
precautions etched on the outside, including ??Do not
evacuate or pressurize unless recommended in the current
DWK Kimble catalog.?? Unfortunately, the catalog does not
contain any information about pressurizing or evacuating
the carboys. It simply says that the carboys are "Ideal
for storage and dispensing of solutions.??
There are no discernible design differences between the
new carboys and the older ones. I wonder if anyone on the
list has experience with assessing the risk associated
with gas pressure differences with this equipment?
Thanks for any information on this.
- Ralph
Ralph Stuart, CIH, CCHO
Environmental Safety Manager
Keene State College
603 358-2859
ralph.stuart**At_Symbol_Here**keene.edu
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