by multiplying the pipe size with the number of welded joints.
regards
ZH
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Inch dia = Number of weld joints X Size of the pipe
no differnece
Surface area of the pipe: diameter*pi*length but make sure that the diameter and length are both in meters or inches.
one inch is one inch; one inch dia refers to one inch diameter of a circle; it is still one inch
volume of a pipe is pi * r * r *h where pi=3.1412 r = half the dia of pipe h= length of the pipe make sure u take r and h in same units in this case keep it inches so your answer is 3.1412 * 1 inch * 1 inch*12 inches(foot) = 37.6944 cubic inches or 0.2617 cubic feet