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)
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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
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.
If you Google "mild steel density" you find that a value of 7.85 is not uncommon.If you calculate the volume of steel in your pipe (Google "volume of cylinder") calculate the volume of the OD cylinder and subtract the volume of the ID cylinder and multiply that by the density you get the mass of the pipe multiply that by the gravitational constant (Google "gravitational constant") of your location to get the weight.Or you could just Google "ms pipe weight calculator" (see the Sources and related links below) find the pipe shape and put in your values, hit "Calculate" and get the answer 34.6889 lbs (which has far too many significant figures (converted to kg by Google as 15.7 kg still with one significant figure too many as two of the original dimensions only had two significant figures)