measure the radius of the pipe. (half the diameter - the width of the pipe) then measure the length of the pipe. then use the formula pi (3.14) x radius2 x length. the answer is the volume in the pipe
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When you calculate the volume of pipe(or cylinder, as I prefer calling it), you need to know 2 things; the height of the cylinder and the radius of the circle(base of the cylinder). Then you use this formula; hpr^2 (height * pi * radius)
Calculate the (diameter of the pipe (D) divide by 2) squared X pi * length and this will give you the volume. eg Volume = (D/2)2 X Pi X Length. (or R2 X Pi X Length) (Use 3.14159265359 as an approximation for Pi.) In practice, 11/14 Times Diameter is used in lieu of (R2 X Pi) as a quick and dirty but near enough approximation.
If we assume that the pipe is completely full of oil, it would just be the volume of the pipe = pi * r2 * l, where pi = 3.14159, r = radius, and l = length of the pipe. If the pipe is not full, then multiply the volume by the percentage of oil in the pipe. For example, if 50% full, then multiply by .5. If the pipe bends, take into account the different volume of the bend. If the bend is 90 degrees, this can be accomplished by taking the average length of the two bent segments for the length.
You need the inside radius (1/2 the inside diameter) of the pipe and the pipe's length. Then, use this formula:Volume = Pi x r2 x length
In terms of volume: infinite - there is no limit to how long the pipe can be!