To find the volume of a cylinder you need to use (Pi) 3.14159 times the radius squared times the length then divide by 231 if the piping is in inches or times by 7.48 if the cylinder is in feet
The only time height is a concern is if your you're going to figure static head or force
The volume does not change if it is a cylinder standing straight up or on its side
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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
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)
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
Use the formula for a cylinder to calculate the volume. This volume will be in cubic feet; you can then convert that to gallons.