The answer will depend on the length of the pipe.
5,600 cubic inches.
A 100-foot pipe with a 6-inch diameter has a volume of: 19.63 cubic feet.
0.0054542 cubic feet.
The volume of this pipe is 1,113 cubic inches or 0.644 cubic feet.
The volume of a 12 inch x 12 inch pipe is: 1,360 cubic inches
201.1 cubic inches for every inch long the piece of pipe is.
Answering "How many Cubic feet are in a 5.5 inch pipe inside 50 feet long?"
A 14-inch diameter by 20 foot long pipe has a volume of: 21.38 cubic feet.
The pipe's volume is the product of its cross-sectional area and its length. The area of a circle is pi*(radius)^2, so in this case pi*9sq.in. or about 28.3 square inches. Multiply this area by the length of pipe you are using to obtain a volume. A 10 foot length of 6 inch pipe will have 3393 cubic inches of volume or 1.96 cubic feet, or 14.7 US Gallons.
The volume of this pipe is 261.8 cubic feet.
The volume is 3,848 cubic inches per linear inch of 70-inch diameter pipe. In terms of liquid volume, this pipe would contain 16.66 gallons of liquid per linear inch.
2,181.66 cubic feet.