With large diameters like that you will most probably need to insert a weld-on 12 inch - 10 inch reducer at the point where the reduction is required.
The pipe and reducer perimeter edges should be bevelled, say 45 degrees, for good weld penetration especially if the pipe conveys fluid under pressure.
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150
2,181.66 cubic feet.
diameter = 10/pi inches
5,600 cubic inches.
Volume = pi1210 = 31.416 cubic feet rounded to 3 decimal places