Quote:
Originally Posted by vstech
it's actually amazing how little vacuum it takes for the atmosphere to crush a steel can.
8 to 10 inches of vacuum should be enough to allow that flat long tank. I should put a gauge on one of mine, and measure how much vacuum it takes to collapse it.
heck, I ought to video the procedure...
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I've done the test. 3 to 4" of HG is all that's needed to start collapsing a 55 gal steel drum. It's the wrong shape to withstand vacuum, flat sides, unsupported. If it was a sphere or egg shape it would withstand much higher vacuum.