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.
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You need to find the density of the oil, from this you will be able to calculate the volume.
You can't. It's impossible.
It is not possible to calculate the area given only the volume.
You cannot calculate volume of surface area. If you meant 20m3, then the volume would be 20,000 litres.
Not enough information. To calculate mass, you would need volume and density (mass = volume x density).