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Hi Norm.
A while back this very thing was discussed here
regarding whether a propane tank that was made to hold a certain amount of
internal pressure, if it would also
hold against the same amount of external pressure.
I can't remember who answered that question, but if memory serves me, the person
who did answer it said
that just because a tank is designed to hold a
certain psi internal pressure, does not necessarily mean it will hold the same
amount of external pressure.
I believe the plastic liter soda container analogy
was used. Wherein...it is hard to outwardly burst a plastic liter soda container
from interior pressure, but it is
easy to crush it. I am not an expert on this but I
do remember the discussion and to the best of my memory the answer to your
question is ....no, you cannot assume
the resistance to pressure goes both
ways.
Bill Akins.
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