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While nobody should ever overpressurize tanks due to the risk involved (104's
cranked to 4000 PSI weigh so much you risk a hernia just lifting them from the
fill tank, and God knows how much trouble you can get into with 360+ ft3 of air
on your back!), it does seem to be fairly common in the cave community.

I have heard that certain tanks, e.g., 104s, were designed with a very large
safety margin (in terms of rated pressure vs. failure pressure), whereas others,
e.g., Al 80s, have a significantly smaller safety margin.  If anyone has
concrete information on the safety margin for common tanks, it would make an
interesting posting.

John
jheimann@sc*.gt*.co*

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