For those interested, CGA C-6 "Standard for Visual Inspection of Steel Compressed Gas Cylinders issued by the Compressed Gas Association Inc. specifies that a 20 lb. cylinder (which holds 4.77 gallons) manufactured to DOT/ICC code 4B(A)-240 must have a minimum wall thickness of 2.27mm- that's just a little less than 1/10th of inch.
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