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Do vacuum vessels have issues with the interior layers flaking off?

by pa5tabear
Tags: flaking, interior, layers, vacuum, vessels
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pa5tabear
#1
May1-14, 05:09 PM
P: 176
I've heard of issues in low pressure chemical reactors where the interior scaling might flake off when a vacuum is pulled.

Which principles govern this?

I know it has to do with internal shear forces and am wondering if a vessel wall would ever split in half.

I saw this related thread on quora but there isn't a good answer.

http://www.quora.com/Is-the-flaking-...lace-the-flask
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ModusPwnd
#2
May1-14, 05:21 PM
P: 1,042
Just my first thought...

If you have a layer that is coating the inside you may have outgassing under that layer due to the lack of pressure. This could instigate or perpetuate flaking.
sophiecentaur
#3
May1-14, 05:52 PM
Sci Advisor
PF Gold
sophiecentaur's Avatar
P: 11,868
The maximum differential pressure on vacuum vessels is only One Atmosphere (unless you go deep under water) and that will not cause much distortion - the vessel design should limit such distortions to an acceptable amount.. Consequently, I wouldn't imagine that flaking would be a problem as long as the inside is already clean and free of contaminants (as it should be).


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