Assuming the 12" pipe means 12" internal diameter, giving us a 6" radius:
Volume of a cylinder is (pi) r^2 h
(3.14) (6*6) (12) = (3.14) (36) (12) = 1356.48 cubic inches.
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The volume of a 12 inch x 12 inch pipe is: 1,360 cubic inches
Approx 21.2 cubic inches.
volume of a pipe is pi * r * r *h where pi=3.1412 r = half the dia of pipe h= length of the pipe make sure u take r and h in same units in this case keep it inches so your answer is 3.1412 * 1 inch * 1 inch*12 inches(foot) = 37.6944 cubic inches or 0.2617 cubic feet
pi*r^2*h gives the volume of a foot long one inch pipe. Radius is 0.5 inches, height is 1 foot/12 inches. So the volume is 9.42 cubic inches. 9.42 (cubic inches) = 0.0407792208 US gallons
Assuming: an 8 inch inside diameter, 1 gallon of water weighs 8.345404 pounds, 231 cubic inches of water to the gallon, volume of cylinder = Pi * radius^2 * height volume=3.14 * 4^2 * (4000 * 12) volume = 3.14 * 16 * 48,000 = 2,411,520 cubic inches 2,411,520 cubic inches of water when full. -------------------------------------------------------------------------- A 4000 foot cylinder/pipe with an 8 inch inside diameter, if full of water, will contain 10,439.48 gallons of water weighing a total of 87,121.68 pounds or 43.56 tons.