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Carbon dioxide leak? Valve failure? Overfill?

In a message dated 12/12/98 1:01:42 PM Pacific Standard Time, Aquatic-Plants-
Owner at actwin_com writes:

 I took the tank back and of course they gave me another.  Their only
 explanation is that it must have been overfilled and when it warmed up
 in my car it was enough to blow the safety valve, which could have been
 defective.   >>
Very strange, crazily strange. I taught H.S. physics and chemistry and have
never heard of such. The gas at human-car temperatures should not, would not
have caused the OP valve to open (goes to several hundred psi, and that's it
at a stated ambient temp.)... and it could not have been overfilled... even
all the way to the top... very strange and scary. Could it be the temp. of the
liquefied gas causing the valve to fail as the cylinder lay over less than
Bob Fenner