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What is the psi on the lid of a 55 gallon drum which is pressurized with air to 6 psi?
youve got normal air pressure on the outside ( about 14.7 psi) and inside, then 6 psi above this on the inside ( guage pressure), so the net pressure is 6 psi, the force on the lid = area of lid in square inches * guage pressure
A 55 (us) gallon drum has a diameter of 22.5 inches, yielding a surface area of
400 sq. ins. multiply * 6 psi = 2400 lbs. force on the end plates
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