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0.3672 gallon per foot of pipe.
A 12 inch diameter round pipe will hold 4.89 UK gallons or 5.88 US gallons per foot.
231 cubic inches. So 0.832674 Gallons.
Over 9,000.
You multiply the radius of the circle 0.5 (radius of a 1 inch pipe) by 3.14(pi) by the height of the pipe 12 inches which gives you 18.84ozs.