How to Calculate Volume of Tubing
Determine the interior volume of a length of tubing to know how much liquid it can hold. Volume tells you which tube is right for a specific job. Plastic or rubber tubing used for fluid transport have the shape of a hollow cylinder. The volume of the tubing depends on its length, diameter and thickness. Diameter measures the width of the tubing as seen from its circular end. Measure diameter along a line that passes through the center of the tube's circular end. Thickness determines the width of the tubing's walls.
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Instructions
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Measure the length, diameter and thickness of the tubing in inches. For example, a tube has a length of 315 inches, a diameter of 1.5 inches and a thickness of 0.25 inches.
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Multiply the number pi times the length times the thickness. Use 3.1416 for pi. Call the result "x." Performing this step leads to 3.1416 times 315 inches times 0.25 inches, or 247.4 square inches for "x."
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Subtract the thickness from the diameter. Call this result "y." Continuing the example, you have 1.5 inches minus 0.25 inches, or 1.25 inches for "y."
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Multiply "x" times "y" to obtain the volume of the tubing in cubic inches. (See References 1) Completing this step you arrive at 247.4 square inches times 1.25 inches, or a volume of 309.3 cubic inches.
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Divide the volume by 231 to convert to gallons, if desired, since a gallon equals 231 cubic inches. Performing this step yields 309.3 cubic inches divided by 231 cubic inches per gallon, or a volume of 1.3 gallons.
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References
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