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you are correct to say it is still only 40 psi, but the total force exerted against the top of the tank is 46,000 pounds of force. More than enough to cause failure. The figure GAinaMontana quotes of 7.4 psi exerted by a D6 cat is pounds per square inch, distributed over the area of the track. When the D6 runs over your foot, it's total weight no longer is equally distributed, but will be concentrated on that bump on the ground called your foot. I too pass on a D6 running over my foot!
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