You are making concrete epoxy pipe. They are 12 inches in outside diameter with

Question

You are making concrete epoxy pipe. They are 12 inches in outside diameter with 3/8 inch walls. The way you make this is you continuously mix the epoxy in your concrete epoxy mixer and you immediately (and continuously) extrude it into this pipe. The mixer mixes 2.3 cubic feet per minute. How many feet of pipe can they make in an hour? (Just as an FYI, they extrude it and then cut it into 10 foot length after it has set for 20 minutes.)

Explanation / Answer

section area of pipe (A) = p(R2out - R2in) sq in = (p/144)*(R2out - R2in) sq ft. Volume mixed per minute = 2.3 cubic ft. =>Volume mixed per hour (V)= 60*2.3 cubic ft => Length of pipe produced per hour = V/A

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