It depends on how long the pipe is. 4" diameter is just the 2 dimensional measurement, therefore you would not be able to determine the volume of that pipe.
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201.1 cubic inches for every inch long the piece of pipe is.
Volume = pi*2.752*6 = 142.5497667 cubic inches
V = pi*r2*h = pi*32*18 = 508.9 cubic inches
A cylinder that has an 18-inch diameter and is 36 inches long has a volume of: 5.3 cubic feet.
The volume is approximately 0.3315 cubic feet.