On Sat, 09 Mar 2013 12:37:51 -0500, Joe Gwinn
wrote:

In article , Jim Wilkins
wrote:

"Joe Gwinn" wrote in message
...
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.

It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn

Is either better for structural uses?

No idea; neither is made or rated for structural use.

Common black "iron" pipe is, as I mentioned in another post, qualified
to ASTM A53, and suitable for structural use.

A53 grade B and A36 (the most common steel for structural rolled
shapes) don't differ much in how they're treated by the AISC Steel
Construction Manual.


--
Ned Simmons