1 inch refers to the inside diameter. So the cross sectional area is pi*radius² = 3.1416*(0.5 in)² = 1.5708 in². Multiply this by the length [5 ft = 60 inches]: 94.248 in³. If you wish: 1 US gallon = 231 in³, so this converts to 0.408 US gallons.
Cylinder Volume = (pi)(r2)h
r=.25 units
h=1ft
V=(pi)(.25)2
The volume is 70.685 cubic feet.
The volume of a 100-foot diameter x 200-foot long cylinder is: 11,750,400 US gallons.
A 14-inch diameter by 20 foot long pipe has a volume of: 21.38 cubic feet.
If the pipe is round, with a 55-foot diameter, and 36 inches long, then its capacity is 53,317.3 gallons. If the pipe is round, with a 36-inch diameter, and 55 feet long, then its capacity is 2,908.2 gallons. Either way, we have no way of knowing how much water is in it. For all we know, it may even be empty.
A four-foot diameter pipe that is five feet long has a volume of 470 gallons.
A pipe that is 30 inches in diameter and 12 feet long has a volume of: 440.6 US gallons of water.
Use the formula for volume on a cilinder that is 1' high and 3/4" in diameter and multiply by 4000 feet.
Volume = 0.8727 cubic feet OR 1,508 cubic inches.
A 1,850-foot long pipe with a 16-inch inside diameter has a volume of 2,580 cubic feet. In terms of liquid volume, this section of pipe can hold up to about 19,300 US gallons.
Pipe is generally cylindrical and the dimension refers to the inside diameter. One cubic foot contains 7.48 gallons. The volume of a one foot long 20" diameter pipe is: pi(1.667/2)^2 = 2.18 cubic feet. At 7.48 gallons per cubic foot the total volume is 16.3 gallons.
The volume of a 5,000-foot long pipe with a 6-inch diameter is: 981.75 cubic feet.
The volume in liters of a 100mm long by 50mm diameter cylinder is: 0.196 liters.