Originally Posted by curtis catman
1.5 " Alum. conduit $1.20 a foot Unbendable anodized alum. $5 a foot. As far as I can tell the only difference is the anodizing. I have tested both by hanging weight on a length of pipe. The ID of the conduit is consistant. What is the difference?
The difference is the inertial characteristics. Measure with calipers to the 0.001 in. The second area moment
(Moment of inertia) is 3.14159 x (Do^4-Di^4)/64 The value for most 1.5" pipe is 0.31 in^4 1.25" pipe is somewhere around 0.195in^4 The conduit you have is somewhere around 0.16 in^4
However, conduit is made for bending and its alloys are soft and ductile (capable of high strain in tensile regime).
The 1.25 pipe is available for @$2.50/ft and the 1.5 is available for $3/ft in small quantity.
That conduit is good for kitchen tables. There are not many fittings to construct to that size so you should be ready to weld it.