please i will said what i do but please make acheck
if u have asteel pipe and want to know the weight of it you have to know the following
1- the outer diameter
2- the thickness of the pipe
the u do the following ]
(outer diam - thickness) * 3.14 * 7.85 * thikness * lenght of pipe (in millemeter) / 1000000
= the weight of the pipe
* Note that : all dimension are in millimeter